Re: [vox-tech] handling urls in Thunderbird on Kubuntu
On Mon, Sep 25, 2006 at 03:20:17PM -0700, Dave Margolis wrote: Hello, I'm running both Thunderbird and Firefox under Kubuntu (Dapper). Thunderbird is assuming Konqueror as the default browser. Thunderbird doesn't appear have a setting for this (as far as I know; the setting may be buried in T-Bird's about:config panel or may be right in front of me in the preferences). Under System Settings / KDE Components / Web Browser I have 'In the following browser: /usr/bin/firefox' specified (though this setting is supposed to be specific to KDE apps so should have no effect on this issue). Anyway, this is a relatively minor GUI annoyance, but if anybody knows what to do, please let me know. Here are a couple things you could check: - Do you have BROWSER set in your environment? - What is the output of namei x-www-browser? If x-www-browser appears to point at conquerer, you'll want to do a: sudo update-alternatives --config x-www-browser Also, a suggestion in https://launchpad.net/distros/ubuntu/+source/mozilla-thunderbird/+bug/31841 was to perform sudo dpkg-reconfigure mozilla-thunderbird and pick GNOME -- HTH, Micah J. Cowan Programmer, musician, typesetting enthusiast, gamer... http://micah.cowan.name/ ___ vox-tech mailing list vox-tech@lists.lugod.org http://lists.lugod.org/mailman/listinfo/vox-tech
Re: [vox-tech] confusing httpd log entry
On Sun, Sep 24, 2006 at 01:30:36AM -0700, Cylar Z wrote: Hey all, I was looking at my httpd log the other day (via the Logwatch program that emails me a daily update) and I saw this: - httpd Begin- 0.45 MB transferred in 21 responses (1xx 0, 2xx 13, 3xx 1, 4xx 7, 5xx 0) 11 Images (0.03 MB), 1 Windows executable files (0.41 MB), 8 Content pages (0.01 MB), 1 Redirects (0.00 MB), Requests with error response codes 404 Not Found /favicon.ico: 4 Time(s) /robots.txt: 2 Time(s) http://www.searchpost.net/azenv.php: 1 Time(s) A total of 1 ROBOTS were logged Mozilla/5.0 (compatible; Yahoo! Slurp; http://help.yahoo.com/help/us/ysearch/slurp) 2 Time(s) --httpd End 1 Windows executable files (0.41 MB)?? WTF? This system runs Linux. Why is it transferring an .EXE file from my server...or did someone somehow push one ONTO the system through my Apache httpd service? If so, how and why? Where in the directory tree would I look for it? I don't know the answer to that... it's possible the log parser saw a /request/ for an .exe (as often happens) that wasn't fulfilled, but it isn't listed in the error response section... perhaps Apache is configured to recognize certain .exe requests and redirect them (trying to kill two questions with one answer ;) )? If I were you, I'd scan the logs by hand from yesterday, and search for .exe requests. I'd also do a search for .exe files in your htdocs or www directory. For that matter, why is it issuing redirects when I haven't set up any on the system? There are some redirects that are built into Apache. In particular, if someone types a URL which resolves to a directory, and don't include a final slash, Apache would redirect it to the location that includes the slash. -- HTH, Micah J. Cowan Programmer, musician, typesetting enthusiast, gamer... http://micah.cowan.name/ ___ vox-tech mailing list vox-tech@lists.lugod.org http://lists.lugod.org/mailman/listinfo/vox-tech
Re: [vox-tech] Special Character Issues in a web page
On Wed, Sep 20, 2006 at 10:06:04AM -0700, Richard S. Crawford wrote: This may be a dumb question, but can the backslash character be used to denote special characters on a webpage under some circumstances in addition to the ampersand? I'm asking because as I review some of our old pages, some of our Spanish text pages seem to use, say, \351 to refer to the accented o character instead of oacute; or even #351. Strangely, when I worked on these pages in a text editor, those characters were rendered as strange characters, nothing like what they were supposed to be. Anyone have any thoughts? \351 in HTML can only represent the four characters, \351. I strongly suspect that it is in fact, one character, and certain text editors are representing it using the string \351. This suspicion is bolstered by the fact that you've mentioned that some text editors display it as garbled. Probably, those text editors were configured to interpret in a different charset (UTF-8, most likely), and didn't know what to do when they came across this ISO 8859-1 character. Using character codes directly within the HTML is permissible, but to work reliably the server needs to indicate the character set being used, in its response headers (or, the HTML page itself can use meta http-equiv=Content-Type ...). Another possibility is that it's not actually HTML, and is being preprocessed into HTML, during which time escape sequences such as \351 are translated into the corresponding character. This seems less likely to me. -- Micah J. Cowan Programmer, musician, typesetting enthusiast, gamer... http://micah.cowan.name/ ___ vox-tech mailing list vox-tech@lists.lugod.org http://lists.lugod.org/mailman/listinfo/vox-tech
Re: [vox-tech] spam current events
On Thu, Aug 31, 2006 at 04:51:26PM -0400, Peter Jay Salzman wrote: i'm getting hammered with email containing text designed to trick bayesian filters. unfortunately, it appears to be quite successful in that endeavor. the email text is nonsensical, however the email has a gif image attachment. at first, the gif was always named image001.gif, and i was able to REJECT such emails when Postfix detected a gif attachment named image001.gif. but whoever is sending this got smarter and now the gif file is named all kinds of things. i'm not quite sure how to filter these things anymore other than to REJECT all gif attachments, which I'd prefer not to do if i can help it.. the gif image itself is mostly white with a few colored threads here and there. i certainly don't see any text, so i'm not quite sure what their purpose is. perhaps it's some kind of virus? anyone else seeing these things? i'm getting them a few times a day now. Well, since I work for the leading manufacturer* of spam filter appliances... I can tell you some of the avenues we've pursued for dealing with this. Note that these are features-in-progress, and not necessarily features that are currently or will at some point be available. To my knowledge, none of this information is confidential. One method for dealing with this is to obtain a checksum of all image attachments within all emails that are reported to be spam, and place it in a database. Then, whenever we receive an email, we get checksums of each image, and check it against the database. If we find the checksum, it's spam. I don't know if there's a public database of this type somewhere. I wouldn't be surprised if there were. If there isn't, you can at least keep track of the attachments you've already seen in your own local database, and use that to throw future emails out. Another method is to do OCR on the image, and check the results against SpamAssassin-style rules. For my money, I'd probably do bayes and intent checks (via spamhaus.org) against it as well. In fact, I would not be surprised if we end up doing that here at some point. From what I understand, we are using GNU Ocrad for this. * Barracuda Networks, Inc. http://www.barracudanetworks.com/ Since I've mentioned some things regarding my employer, it's probably best to mention that anything I've said or opinions I have are strictly my own words or views, and not necessarily those of Barracuda Networks, Inc. :-) -- Micah J. Cowan Programmer, musician, typesetting enthusiast, gamer... http://micah.cowan.name/ ___ vox-tech mailing list vox-tech@lists.lugod.org http://lists.lugod.org/mailman/listinfo/vox-tech
Re: [vox-tech] spam current events
On Thu, Aug 31, 2006 at 02:33:17PM -0700, Alex Mandel wrote: On a separate thought has anyone tried out any of the community based blacklist/anti-spam groups where they use a dispersed reporting tool to identify servers to blacklist and email address's to identify providers that may have violators on their system, or in the case of this one file complaints in bulk with the spammer. http://en.wikipedia.org/wiki/Blue_Frog Note that they don't do this anymore (this is mentioned at the end of the article). The spammers' response was effective enough to win them the battle :( http://www.washingtonpost.com/wp-dyn/content/article/2006/05/16/AR2006051601873.html -- Micah J. Cowan Programmer, musician, typesetting enthusiast, gamer... http://micah.cowan.name/ ___ vox-tech mailing list vox-tech@lists.lugod.org http://lists.lugod.org/mailman/listinfo/vox-tech
Re: [vox-tech] spam current events
On Thu, Aug 31, 2006 at 02:47:30PM -0700, Rod Roark wrote: On Thursday 31 August 2006 13:51, Peter Jay Salzman wrote: i'm getting hammered with email containing text designed to trick bayesian filters I think content filtering is almost a waste of time. As you see, spammers can always design content that gets past the filters. What else are you doing to combat spam? The blacklists (RBLs) are my core defense, however some stuff inevitably gets through. More disturbingly, good things inevitably get blocked. Some people's experience have shown that too many RBLs let politics interfere with their jobs, and block sites for questionable reasons. I'm not speaking from my own experience on this, so please don't ask me to corroborate this claim ;-) Spamhause's SBL has been one of the more reliable services, in my own experience and that of others from whom I've heard. But, Rod, while content filtering is a continual game of one-upmanship, it /is/ fairly effective when it's kept up-to-date. And, of necessity, RBLs will always have some degree of lag. One relatively effective method is to combine content-filtering with RBLs (intent-checking: SpamAssassin will do this with spamhaus if you enable it). But spammers still have some sneaky tricks in dealing with this, so the engine you use to reap URLs from an email needs to be effective; and you need to have fast lookups maybe combined with whitelists, because spammers will throw in 50 good URLs to confuse the scanner, or tie it up with too many lookups. I can't comment on the effectiveness of SpamAssassin's engine; Barracuda Networks uses the engine I wrote. -- My $0.02, Micah J. Cowan Programmer, musician, typesetting enthusiast, gamer... http://micah.cowan.name/ ___ vox-tech mailing list vox-tech@lists.lugod.org http://lists.lugod.org/mailman/listinfo/vox-tech
Re: [vox-tech] vim: change characters, then dumping in insert mode.
On Tue, Aug 01, 2006 at 03:59:36PM -0400, Peter Jay Salzman wrote: In Vim, ncw deletes n words and puts you in insert mode. Is there a similar construct for deleting n characters and leaving you in insert mode? I'm using the Vim plugin for the Eclipse IDE. Unfortunately, it doesn't support visual mode, and something like ncx (which doesn't work) along with . would be almost as good. ncl will do what you want. So would nxi (same number of characters...). -- Micah J. Cowan Programmer, musician, typesetting enthusiast, gamer... http://micah.cowan.name/ ___ vox-tech mailing list vox-tech@lists.lugod.org http://lists.lugod.org/mailman/listinfo/vox-tech
Re: [vox-tech] vim: change characters, then dumping in insert mode.
On Tue, Aug 01, 2006 at 03:43:40PM -0500, Ken Bloom wrote: On Tue, Aug 01, 2006 at 01:18:38PM -0700, Micah J. Cowan wrote: On Tue, Aug 01, 2006 at 03:59:36PM -0400, Peter Jay Salzman wrote: In Vim, ncw deletes n words and puts you in insert mode. Is there a similar construct for deleting n characters and leaving you in insert mode? I'm using the Vim plugin for the Eclipse IDE. Unfortunately, it doesn't support visual mode, and something like ncx (which doesn't work) along with . would be almost as good. ncl will do what you want. So would nxi (same number of characters...). nxi can't be repeated with the . key because it's two commands. Yeah, I missed the . part. BTW, I ususally type ncw or ncl as cnw or cnl because commands like ni insert n times, and I would expect ncl to do similarly even though in reality it doesn't. Yeah, I do, too. It makes a bit more sense to me to say change the text consisting of the next 3 words, then do `change the next word' 3 times (which, as you point out, would be wrong anyway). -- Micah J. Cowan Programmer, musician, typesetting enthusiast, gamer... http://micah.cowan.name/ ___ vox-tech mailing list vox-tech@lists.lugod.org http://lists.lugod.org/mailman/listinfo/vox-tech
Re: [vox-tech] quickie postfix config issue
On Sun, Jul 23, 2006 at 06:16:53AM -0700, Rod Roark wrote: On Sunday 23 July 2006 01:52, Cylar Z wrote: ... The system is able to receive mail normally. It also sends it with no problems. HOWEVER, mail sent from the system appears to come from [EMAIL PROTECTED] instead of from my domain name. How can I fix this? ... Postfix, being a Mail Transport Agent, just moves mail around; it does not create the FROM header. Unless he was talking about what shows up in the trace headers or X-Return-Path or something... then it's the MTA. -- Micah J. Cowan Programmer, musician, typesetting enthusiast, gamer... http://micah.cowan.name/ ___ vox-tech mailing list vox-tech@lists.lugod.org http://lists.lugod.org/mailman/listinfo/vox-tech
Re: [vox-tech] rar unrar and non-free package
On Tue, Jun 27, 2006 at 12:14:41AM -0700, Ryan wrote: On Sunday 25 June 2006 11:15 pm, Micah J. Cowan micah-at-cowan.name |lugod| wrote: ...I suspect that trying to do so would be impractical on Unix, though: Unix users have far too much control over their environment to be deterred from using something based on some sort of time-tracking scheme... :-) http://freshmeat.net/projects/dateshift/ I use it in my wrapper shell script for cdrecord-ProDVD to keep it for expiring every 6 months (it's free as in beer, but you still have to update the key every 6 months, and it annoys me greatly) Thanks for proving me right, and for the link to a very interesting piece of software. What is cdrecord-ProDVD? If it's just a CLI DVD-recorder, have you tried growisofs from dvd+rw-tools? It is insanely easy to use, and works extremely well. However, I highly recommend you use the latest version (compile from source if necessary), especially if you have a Pioneer drive (as I do). Other drives are extremely likely to work with whatever your current distro version has. Free as in speech... -- Micah J. Cowan Programmer, musician, typesetting enthusiast, gamer... http://micah.cowan.name/ ___ vox-tech mailing list vox-tech@lists.lugod.org http://lists.lugod.org/mailman/listinfo/vox-tech
Re: [vox-tech] rar unrar and non-free package
On Sun, Jun 25, 2006 at 09:55:21PM -0700, Bill Kendrick wrote: On Sun, Jun 25, 2006 at 05:05:19PM -0700, Micah J. Cowan wrote: It's worth pointing out, though, that the rar utility is also non-free-as-in-beer: it's shareware. Oh, interesting. Aside from the apt description's comment on the shareware/registration issue, does 'rar' or the rar package do anything to enforce the registration requirement, or at least remind users after 40 days? I have no idea. ...I suspect that trying to do so would be impractical on Unix, though: Unix users have far too much control over their environment to be deterred from using something based on some sort of time-tracking scheme... :-) -- Micah J. Cowan Programmer, musician, typesetting enthusiast, gamer... http://micah.cowan.name/ ___ vox-tech mailing list vox-tech@lists.lugod.org http://lists.lugod.org/mailman/listinfo/vox-tech
Re: [vox-tech] rar unrar and non-free package
It's worth pointing out, though, that the rar utility is also non-free-as-in-beer: it's shareware. $ apt-cache show rar snip Description: Archiver for .rar files This is the RAR archiver from Eugene Roshal. It supports multiple volume archives and damage protection. It can also create SFX-archives. There are versions which run on DOS, Windows (3.1x,95,NT), FreeBSD, BSDI. . This program is shareware and you must register it after 40 days of use. Bugs: mailto:[EMAIL PROTECTED] Origin: Ubuntu -Micah On Sun, Jun 25, 2006 at 06:06:09PM -0400, Hai Yi wrote: thank you, Norm and Bill. Norm, I tried out the site you refered to and have it downloaded and working; Bill, thanks for the clarification in regard of the non-free stuff, maybe I'll then try some of them : ) Hai On 6/25/06, Bill Kendrick [EMAIL PROTECTED] wrote: On Sun, Jun 25, 2006 at 10:01:46AM -0400, Hai Yi wrote: I downloaded a rar zip file and check the debian packages and found the utilities like rar/unrar are non-free. snip How to proceed if I do want to purchase a non-free package? ^^^ In Debian, non-free specifically refers to the license, not the monetary cost. From The Debian GNU/Linux FAQ, Chapter 5: The Debian FTP archives [ http://www.debian.org/doc/FAQ/ch-ftparchives.en.html ]: stable/non-free/: This directory contains packages distribution of which is restricted in a way that requires that distributors take careful account of the specified copyright requirements. For example, some packages have licenses which prohibit commercial distribution. Others can be redistributed but are in fact shareware and not freeware. The licenses of each of these packages must be studied, and possibly negotiated, before the packages are included in any redistribution (e.g., in a CD-ROM). So when you go to download a package from the non-free Debian repositories, you're not being charged for it. :) Just thought I'd clear that up, since it looked like there was some confusion. ___ vox-tech mailing list vox-tech@lists.lugod.org http://lists.lugod.org/mailman/listinfo/vox-tech
Re: [vox-tech] re: selinux woes (Apache issue?)
On Thu, Jun 22, 2006 at 11:17:19PM -0700, Cylar Z wrote: [Thu Jun 22 01:12:57 2006] [error] [client 71.XXX.XXX.XXX] (13)Permission denied: access to /images/picture012.jpg denied, referer: http://www.mydomain.com/parentdocument.html [Thu Jun 22 01:18:15 2006] [error] [client 71.XXX.XXX.XXX] File does not exist: /var/www/html/mydomain.com/images/ranch_trip_032, referer: http://www.mydomain.com/images/images.html Doesn't exist? This is a joke, right? [Thu Jun 22 01:19:24 2006] [error] [client 71.XXX.XXX.XXX] (13)Permission denied: access to /images/ranch_trip_032.jpg denied, referer: http://www.mydomain.com/images/images.html Interesting...first it doesn't exist, now it does exist but permission is denied. First it doesn't exist... but if you look carefully, what it claims not to exist is actually a different file than the one whose access is denied: ranch_trip_032 vs ranch_trip_032.jpg. ...you might try su-ing to nobody (or whoever httpd runs as) from within the document root, and trying to navigate the directories and read the appropriate files... If Mr. nobody can read the files you want, then maybe post any ACL-related portions of your httpd.conf, and any other portions that might conceivably be relevant? -- Micah J. Cowan Programmer, musician, typesetting enthusiast, gamer... http://micah.cowan.name/ ___ vox-tech mailing list vox-tech@lists.lugod.org http://lists.lugod.org/mailman/listinfo/vox-tech
Re: [vox-tech] LART Manufacturer [OT]
On Wed, Jun 21, 2006 at 04:24:19PM -0700, Alex Mandel wrote: Anyone know of a local company or super geek capable of making these: http://www.lartmaker.nl/ Huh. I visited that site fully expecting to see some sort of torture device for use against clueless lusers. Clever choice for an acronym, but does it convey the right connotations, I wonder? -- Micah J. Cowan Programmer, musician, typesetting enthusiast, gamer... http://micah.cowan.name/ ___ vox-tech mailing list vox-tech@lists.lugod.org http://lists.lugod.org/mailman/listinfo/vox-tech
Re: [vox-tech] Firefox find utility
On Tue, Jun 20, 2006 at 11:09:35AM -0700, Bill Kendrick wrote: On Tue, Jun 20, 2006 at 11:46:05AM -0400, Peter Jay Salzman wrote: I find the FF find feature to be weaker than what I've come to expect from Unix tools. For example, it would be really nice to specify regex type syntax, like ^foo to find the substring foo abutted against the left margin. Wouldn't that depend on how wide your brower is and how things are word-wrapping? ;^) I guess maybe you meant at the beginning of a paragraph, in the leftmost cell of a table, just after a br line break, etc.? I doubt that's what he meant. After all, though it /does/ depend on how your browser is, it's the browser that is performing the search in the first place: it knows where all the line breaks are. Myself, I'd probably never use ^ in firefox (unless the document were actually plaintext); but there's scads of times when I would've wanted basic regex support... The dot character, character classes, maybe word boundaries... -- Micah J. Cowan Programmer, musician, typesetting enthusiast, gamer... http://micah.cowan.name/ ___ vox-tech mailing list vox-tech@lists.lugod.org http://lists.lugod.org/mailman/listinfo/vox-tech
Re: [vox-tech] a comment on Pete's fast-loop question
On Sun, Jun 18, 2006 at 11:44:19PM -0400, Peter Jay Salzman wrote: On Sun 18 Jun 06, 8:13 PM, Micah J. Cowan [EMAIL PROTECTED] said: Given your explanation above, you might also find Hacker's Delight to be enjoyable reading (if you haven't read it already). ...just promise me you'll document the hell out of pretty much anything you /use/ out of there... :-) You know... a long time ago I read a /. book review of this book and it's been in the back of my head for a long time. I never had the money to purchase it (I think it's still on my nerdbooks.com wishlist). You just reminded me of it. Yeah, that's a book I can afford now; I think I'll take the plunge. I set up a wiki on www.dirac.org/programming to document everything I learn about programming, numerics, and numerical algorithms. Slowly but surely, a lot of my saved vox-tech messages (like this one) are getting documented there. I also plan on documenting things I learn from books like Hacker's Delight. I should also point out that it may be unwise to implement some of the operations that book describes, that are already easily supported through more conventional means. For instance: the book may have some neat tricks for integer division, but the truth is that optimizing such things is the compiler's job, and sometimes the compiler will know better ways to do it (especially down the road in the future). Simpler code is frequently the best approach, no matter what cool tricks you know. Some things, OTOH, such as bit-counting, or other properties of a value-type evaluations, are much enhanced by exactly these sorts of tricks. -- Micah J. Cowan Programmer, musician, typesetting enthusiast, gamer... http://micah.cowan.name/ ___ vox-tech mailing list vox-tech@lists.lugod.org http://lists.lugod.org/mailman/listinfo/vox-tech
Re: [vox-tech] Mp3 Stereo to mono
On Sat, Jun 17, 2006 at 10:24:37PM -0700, Jeff Newmiller wrote: Alex Mandel wrote: [...] Any suggestions on this are quite welcome, keep in mind that these audio files are for analysis of bird songs in a scientific setting so any alteration of the actual original audio is unacceptable as we might lose valuable information from filters and adjustments. If authenticity is so important, why are you using MP3 in the first place? MP3 or Ogg, or any other compression method that is lossy and based on throwing out information based on how the human brain processes audio information, does seem /completely/ inappropriate as a storage format from which to draw scientific conclusions... -- Micah J. Cowan Programmer, musician, typesetting enthusiast, gamer... http://micah.cowan.name/ ___ vox-tech mailing list vox-tech@lists.lugod.org http://lists.lugod.org/mailman/listinfo/vox-tech
Re: [vox-tech] a comment on Pete's fast-loop question
On Sun, Jun 18, 2006 at 08:26:21PM -0400, Peter Jay Salzman wrote: On Sun 18 Jun 06, 12:06 AM, Norm Matloff [EMAIL PROTECTED] said: Pete Salzman asked about optimizing a loop in terms of execution speed, by having the loop index go from high value to low instead of vice versa. Some discussion ensued in terms of what machine instructions a compiler could take advantage of in this manner. One point that you might consider, Pete, is that these considerations are kind of nickel-and-dime in comparison to things like memory hierarchy issue. There is much better payoff potential in writing code in such a way as to minimize cache misses, which cause major time penalties, and page faults, which cause catastrophic time penalties. Yeah, I know. My company hired me for algorithmic optimizations --- my knowledge of devising a set of algorithms to accomplish a given task (e.g., solving dense matrices, choosing a particular Monte Carlo for a given problem). I guess my attitude towards this was more along the lines of while I'm in the neighborhood, why don't I stop by and say hello. It certainly wouldn't be prudent to re-implement code to use nickel and dime optimization, but while thoughts in my neurons travel down my CNS and translate into my fingers tapping on keys, I might as well tap on keys in such a way that the nickel and dime optimizations appear on vim's terminal. The price of admission is free, so I might as well. OK. I took that nutty metaphor as far as it can go. Hope it made sense. There is even a book on this, I believe in the Intel Press series. Definitely sounds like a book I should pick up. I'll Google for it! Given your explanation above, you might also find Hacker's Delight to be enjoyable reading (if you haven't read it already). ...just promise me you'll document the hell out of pretty much anything you /use/ out of there... :-) -- Micah J. Cowan Programmer, musician, typesetting enthusiast, gamer... http://micah.cowan.name/ ___ vox-tech mailing list vox-tech@lists.lugod.org http://lists.lugod.org/mailman/listinfo/vox-tech
Re: [vox-tech] loop efficiency and testing against zero.
On Fri, Jun 16, 2006 at 12:52:17PM -0700, Tim Riley wrote: Peter Jay Salzman wrote: I've read somewhere that a loop that runs from 0 to some number should be written to go in reverse order, e.g. instead of: for ( int i = 0; i 10; ++i ) we should write: for ( int i = 9; i = 0; --i ) I would think this: for( int i = MAXINT; i; --i ); is faster than this: for( int i = 0; i MAXINT; ++i ); However, on my machine they both took the same time -- 3.24 seconds. I would think the test of 'i' would be a single instruction and the test of 'i MAXINT' would take multiple instructions. But surprise! No, they are both exactly identical in meaning, and thus representable with exactly the same instructions. I don't know how GCC's optimizations work, but it's the compiler's job to handle rote optimizations like this; I imagine that if you enable -O3, GCC might (should) notice that you're not actually using the value of i, and optimize it to the decrement operation if appropriate. Optimization should always happen after implementation. -- Micah J. Cowan Programmer, musician, typesetting enthusiast, gamer... http://micah.cowan.name/ ___ vox-tech mailing list vox-tech@lists.lugod.org http://lists.lugod.org/mailman/listinfo/vox-tech
Re: [vox-tech] loop efficiency and testing against zero.
On Fri, Jun 16, 2006 at 02:31:10PM -0700, Rod Roark wrote: On Friday 16 June 2006 14:21, Micah J. Cowan wrote: ... Optimization should always happen after implementation. No generalization is worth a damn, including this one. Absolutely. And, in fact, I think that phrase (the one I just wrote a moment ago...) is a bit simplistic and overused without qualification. The truth is, if you know two ways to do something: an easy one that's exponential-time, and a /slightly/ harder one that's linearythmic, by golla, you'll do the linearythmic one... especially if you can pretty much count on it being used frequently. I think the thing you really want to warn against is nit-picky optimizations that have exactly the same complexity (as denoted by the Big Theta notation), but that just tweak the constant term, or the constant multiplier by a negligible amount. But Optimization should happen after implementation is quicker to say, and is a good rule-of-thumb at any rate... :-) -- Micah J. Cowan Programmer, musician, typesetting enthusiast, gamer... http://micah.cowan.name/ ___ vox-tech mailing list vox-tech@lists.lugod.org http://lists.lugod.org/mailman/listinfo/vox-tech
Re: [vox-tech] loop efficiency and testing against zero.
BTW, I found a terrific (IMO) post about code optimization a while back: http://www.jroller.com/page/rolsen?entry=five_truths_about_code_optimization -Micah ___ vox-tech mailing list vox-tech@lists.lugod.org http://lists.lugod.org/mailman/listinfo/vox-tech
Re: [vox-tech] Why change default ssh port?
On Fri, Jun 16, 2006 at 05:31:34PM -0700, Rick Moen wrote: 3. We Were Here First. Speaking for myself, I'll be damned if I'll abandon port 22 just because a bunch of cretin kiddies and Russian mafiosi with automated 'sploit code and dictionary files want to conduct doorknob-twisting on it. Likewise, it's beneath my dignity to obscure my e-mail address just because someone might try to send it adverts for dubious investment opportunities. Do those guys think they're better at Internet management than the open-source technical community is? Well, they're wrong, and they can kiss my shiny Exim rulesets. This is exactly the same reasoning I used to decide I didn't want to obscure or control access* to my email address, either. * Although I never tried it, AFAICT, trying to give your email address only to trusted individuals /never/ works. Some idiot forgets to be careful with it at some point... -- Micah J. Cowan Programmer, musician, typesetting enthusiast, gamer... http://micah.cowan.name/ ___ vox-tech mailing list vox-tech@lists.lugod.org http://lists.lugod.org/mailman/listinfo/vox-tech
Re: [vox-tech] Why change default ssh port?
On Fri, Jun 16, 2006 at 05:54:35PM -0700, Rick Moen wrote: Quoting Micah J. Cowan ([EMAIL PROTECTED]): This is exactly the same reasoning I used to decide I didn't want to obscure or control access* to my email address, either. * Although I never tried it, AFAICT, trying to give your email address only to trusted individuals /never/ works. Some idiot forgets to be careful with it at some point... There were two things I noticed some years back, that made up my mind: 1. I noticed that apparently staggeringly large botnets were (seemingly) attempting dictionary-style delivery to all possible usernames at my mail exchanger. (The scale of resources required sort of boggled me. I have no idea if this method works for the spammers, but the fact that I still see it occasionally argues that it does.) Did you mean brute-force-style, there? 'Coz I've seen that, too... I'm not /too/ worried about dictionary-style attacks, as my first name is fairly unusual.. -- Micah J. Cowan Programmer, musician, typesetting enthusiast, gamer... http://micah.cowan.name/ ___ vox-tech mailing list vox-tech@lists.lugod.org http://lists.lugod.org/mailman/listinfo/vox-tech
Re: [vox-tech] Tracking down a redirect
On Wed, Jun 14, 2006 at 02:30:54PM -0700, Richard Crawford wrote: We're having a strange domain resolution issue, and it's stumped me. Here's the setup. Domain http://unexdlc.ucdavis.edu should be resolving to IP address 152.79.198.9. However, it is instead resolving to http://extensiondlc.net, which is an entirely different IP address. Similarly, typing http://152.79.198.9 into a browser brings up extensiondlc.net, which should not be happening. When the physical computer which hosts .9 is disconnected from the network, the redirect does not happen. There is nothing in the Apache configuration file on .9 which should account for this behavior. When I execute a traceroute, I'm redirected immediately on the first hop to extensiondlc. We're trying to find out where this might be happening. Can anyone offer some suggestions? From your description, it's clear that it has nothing to do with Apache or HTTP. You say ... should be resolving to IP address 152.79.198.9. However, according to dig: ;; QUESTION SECTION: ;unexdlc.ucdavis.edu. IN A ;; ANSWER SECTION: unexdlc.ucdavis.edu.7200IN CNAME extensiondlc.net. extensiondlc.net. 86364 IN A 204.11.233.24 so, in fact it isn't. It looks like the UCD nameservers are misconfigured. -- HTH, Micah J. Cowan Programmer, musician, typesetting enthusiast, gamer... http://micah.cowan.name/ ___ vox-tech mailing list vox-tech@lists.lugod.org http://lists.lugod.org/mailman/listinfo/vox-tech
Re: [vox-tech] Tracking down a redirect
On Wed, Jun 14, 2006 at 03:57:25PM -0700, Mark K. Kim wrote: On Wed, Jun 14, 2006 at 03:16:50PM -0700, Micah J. Cowan wrote: On Wed, Jun 14, 2006 at 02:30:54PM -0700, Richard Crawford wrote: [snip] Domain http://unexdlc.ucdavis.edu should be resolving to IP address 152.79.198.9. However, it is instead resolving to http://extensiondlc.net, which is an entirely different IP address. Similarly, typing http://152.79.198.9 into a browser brings up extensiondlc.net, which should not be happening. [snip] You say ... should be resolving to IP address 152.79.198.9. However, according to dig: [snip] unexdlc.ucdavis.edu.7200IN CNAME extensiondlc.net. extensiondlc.net. 86364 IN A 204.11.233.24 Furthermore, connecting directly to 152.79.198.9 causes 301 Moved Permanently redirection to unexdlc.ucdavis.edu, which is an alias for extensiondlc.net. So it appears to be a 2-layer problem - DNS as well as some server issue. snip 152.79.198.9. FYI, if you try HTTP/1.1 with host set to unexdlc.ucdavis.edu: $telnet 152.79.198.9 80 Trying 152.79.198.9... Connected to 152.79.198.9. Escape character is '^]'. GET / HTTP/1.1 host: unexdlc.ucdavis.edu HTTP/1.1 302 Found Date: Wed, 14 Jun 2006 22:52:50 GMT Server: Apache/2.0.44 (Unix) mod_perl/1.99_08 Perl/v5.8.0 DAV/2 Location: http://unexdlc.ucdavis.edu/cfmx/DLC/ Content-Length: 340 Content-Type: text/html; charset=iso-8859-1 !DOCTYPE HTML PUBLIC -//IETF//DTD HTML 2.0//EN htmlhead title302 Found/title /headbody h1Found/h1 pThe document has moved a href=http://unexdlc.ucdavis.edu/cfmx/DLC/;here/a./p hr / addressApache/2.0.44 (Unix) mod_perl/1.99_08 Perl/v5.8.0 DAV/2 Server at unexdlc.ucdavis.edu Port 80/address /body/html Connection closed by foreign host. It's a 302 Found but it tells you to go to unexdlc.ucdavis.edu which is an alias for extensiondlc.net. However you look at it, you're being sent to extensiondlc.net. Well, but the server doesn't necessarily understand that unexdlc.ucdavis.edu is a separate host: You've just told it (via the Host header) that /it/ is unexdlc... so it probably thinks its redirecting you to a different path on the same directory. ...huh. That's funny: I don't get the redirect message when /I/ connect... I get a 200 OK with an html body. traceroute to 152.79.198.9 (152.79.198.9), 30 hops max, 40 byte packets 1 192.168.1.2 (192.168.1.2) 0.414 ms 0.311 ms 0.258 ms 2 69.36.252.1 (69.36.252.1) 1.309 ms 1.383 ms 1.207 ms 3 69.36.237.29 (69.36.237.29) 5.388 ms 4.296 ms 3.797 ms 4 g2-1.core3.eqx.layer42.net (69.36.239.82) 3.374 ms 18.542 ms 2.904 ms 5 sjo-ix.he.net (206.223.116.37) 3.292 ms 3.008 ms 3.069 ms 6 pos2-2.gsr12416.pao.he.net (216.218.224.105) 4.157 ms 4.652 ms 3.929 ms 7 paix-px1--hurricane-ge.cenic.net (198.32.251.69) 42.104 ms 204.192 ms 214.253 ms 8 dc-oak-dc1--svl-dc1-10ge.cenic.net (137.164.22.31) 43.757 ms 14.290 ms 17.195 ms 9 dc-csac-dc1--oak-dc1-ge.cenic.net (137.164.22.111) 14.411 ms 14.102 ms 14.043 ms 10 ucdmc-ge--sac-dc1.cenic.net (137.164.23.74) 42.767 ms 14.252 ms 15.646 ms 11 unexgal9.ucdmc.ucdavis.edu (152.79.198.9) 14.770 ms 42.390 ms 17.086 ms 12 unexgal9.ucdmc.ucdavis.edu (152.79.198.9) 46.669 ms 17.865 ms 15.950 ms 13 unexgal9.ucdmc.ucdavis.edu (152.79.198.9) 45.646 ms 23.779 ms 19.571 ms 14 * * * Notice that unexgal9.ucdmc.ucdavis.edu (which is 152.79.198.9) apparently doesn't realize that 152.79.198.9 is its own IP address, and keeps trying to forward it on...? -- Micah J. Cowan Programmer, musician, typesetting enthusiast, gamer... http://micah.cowan.name/ ___ vox-tech mailing list vox-tech@lists.lugod.org http://lists.lugod.org/mailman/listinfo/vox-tech
Re: [vox-tech] mplayer color problem
On Tue, Jun 13, 2006 at 01:32:57PM -0400, Peter Jay Salzman wrote: On Tue 13 Jun 06, 10:25 AM, Bill Kendrick [EMAIL PROTECTED] said: On Tue, Jun 13, 2006 at 10:49:26AM -0400, Peter Jay Salzman wrote: I've played Quake 3, which uses SDL, on this computer and it plays fine. When I get home, I'll take a look at the cutscenes and see if they suffer from the same washed out color. Well, technically, Quake uses OpenGL. :) It probably uses SDL for input/sound, though. Is that true? It was developed by Loki; I would've thought they use SDL for video too. I did an ldd on the executable and didn't see sdl or gl, although I *know* it uses OpenGL, either via an SDL window or using OpenGL directly... I'm pretty sure Loki games load video/sound drivers at runtime (via dlopen()), as it's usually configurable via something like +set gl_driver ... so you might have better luck using strings on it, and searching for the name of an OpenGL function they'd have to use. -- Micah J. Cowan Programmer, musician, typesetting enthusiast, gamer... http://micah.cowan.name/ ___ vox-tech mailing list vox-tech@lists.lugod.org http://lists.lugod.org/mailman/listinfo/vox-tech
Re: [vox-tech] DVD-CD converion for linus distros?
On Sun, Jun 11, 2006 at 06:36:15PM -0700, Lewis Perdue wrote: Every Linux distro seems to come on DVD now ... but my Linux boxes only have a CD drive ... is there a way to convert the DVD to CDs? Ubuntu is somewhat well-known for residing on a single CD (they have a DVD edition in addition). -- Micah J. Cowan Programmer, musician, typesetting enthusiast, gamer... http://micah.cowan.name/ ___ vox-tech mailing list vox-tech@lists.lugod.org http://lists.lugod.org/mailman/listinfo/vox-tech
Re: [vox-tech] Why change default ssh port?
On Mon, Jun 12, 2006 at 10:58:32AM -0700, Rick Moen wrote: Quoting Richard S. Crawford ([EMAIL PROTECTED]): Our hosting service has (without notice) changed our default ssh port from 22 to 22799. This strikes me as an unusual decision, but I am still a novice at this sort of thing. Why would a host make such a switch (I won't ask why they wouldn't announce it ahead of time; I'm used to that level of service from them). Because they prefer to hide their network services, rather than concentrate on reducing actual vulnerability. +1 -- Micah J. Cowan Programmer, musician, typesetting enthusiast, gamer... http://micah.cowan.name/ ___ vox-tech mailing list vox-tech@lists.lugod.org http://lists.lugod.org/mailman/listinfo/vox-tech
Re: [vox-tech] Why change default ssh port?
On Mon, Jun 12, 2006 at 11:59:24AM -0700, Rick Moen wrote: Quoting MB ([EMAIL PROTECTED]): Every little bit of security/obsfucation helps. Don't forget to make /etc/issue and /etc/issue.net claim that you're running ITS on SuperNintendo. _Somebody_ might be fooled. Putting lampshades on top of your servers could be just the protection you need, too. Just changing the SSH port probably removes 90% of the threats with 10% of the effort. It certainly does win in the easier than thinking department. This seems a /bit/ harsh. And MB does make a valid point that the ROI on simply shifting the ports is somewhat impressive. But I agree that it's a poor substitute for truly improving security. I'm not against changing the port, as it does hide the service's existence, but it ought to at least be coupled with and is certainly no replacement for ensuring that you are running a properly configured and up-to-date service. Sadly, it seems likely that a support staff unwise enough not to announce the move beforehand (thus creating a serious support issue for themselves), is unlikely to take it any further than the port move. I think a good analogy for changing the port number to something nonstandard might be writing a secret message using a Caesar-style cipher. It /does/ provide some security. Someone reading through several messages might be discouraged from bothering with your non-plaintext message, and go for lower-hanging fruit (unfortunately, this seems to be the only goal in too many people's security models), but anyone with the smallest incentive to read your particular message (or, who is perhaps intrigued by the fact that it's not plaintext in the first place) will discover its content quite quickly. No one employing it should deceive themselves into thinking that their communiqué is confidential. Using a simple cipher also gives a decent return/investment ratio. But that should not distract one from the fact that the return itself may not be sufficient for one's needs. -- Micah J. Cowan Programmer, musician, typesetting enthusiast, gamer... http://micah.cowan.name/ ___ vox-tech mailing list vox-tech@lists.lugod.org http://lists.lugod.org/mailman/listinfo/vox-tech
Re: [vox-tech] C and IEEE-754
On Wed, Jun 07, 2006 at 02:48:36PM -0500, Ken Bloom wrote:
On Wed, Jun 07, 2006 at 03:41:02PM -0400, Peter Jay Salzman wrote:
I started to read:
http://www.cs.princeton.edu/introcs/91float/
and came across an interesting comment:
Java uses a subset of the IEEE 754 binary floating point standard to
represent floating point numbers and define the results of arithmetic
operations. Most machines conform to this standard, although some
languages (C, C++) do not guarantee that this is the case.
It's a poorly written paragraph, but seems to say that C and C++ don't
guarantee adherence to the IEEE 754 standard. If this really is the case,
why don't they?
I suppose if your hardware supports something else instead of
IEEE-754, then a conforming C/C++ implementation can use the hardware,
rather than having to emulate IEEE-754.
In fact, IIRC, C predates IEEE('s very existance as an orginazation) by
quite a bit. But the best format for every machine isn't IEEE-754, IBM
and Cray have used their own formats for floating point (though, AIUI,
for the most part they have supported IEEE-754 in addition to their
own).
Note that C doesn't even have particular requirements on the radix used
by the floating point model (i.e., it doesn't have to be 2. Hell, it
could be 10!).
However, you can test for the existence of a macro, __STDC_IEC_559__,
whose existence guarantees conformity to IEC 60559:1989 floating point
(which is the current designation for ANSI/IEEE 754-1989, which was also
designated IEC 559:1989 before it went to 60559. If that macro is
defined, then you are free to assume the usual semantics for floating
point.
C++ uses a completely different approach . You use the numeric_limits
type defined in the limits header:
if (std::numeric_limitsdouble::is_iec559) {
...
}
AFAICT, the __STDC_IEC_559__ macro is only available in C99; my draft
copy of C90 doesn't mention it (but does refer to IEEE 754 in some
examples).
However, float.h provides a number of definitions useful in describing
the floating-point model used, and there are certain guarantees made
about them (such as a double being convertable to 10 decimal digits and
back without loss of information).
--
Micah J. Cowan
Programmer, musician, typesetting enthusiast, gamer...
http://micah.cowan.name/
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Re: [vox-tech] C and IEEE-754
On Wed, Jun 07, 2006 at 02:10:56PM -0700, Richard Harke wrote:
On Wed June 7 2006 13:30, Micah J. Cowan wrote:
On Wed, Jun 07, 2006 at 02:48:36PM -0500, Ken Bloom wrote:
On Wed, Jun 07, 2006 at 03:41:02PM -0400, Peter Jay Salzman wrote:
I started to read:
http://www.cs.princeton.edu/introcs/91float/
and came across an interesting comment:
Java uses a subset of the IEEE 754 binary floating point standard
to represent floating point numbers and define the results of
arithmetic operations. Most machines conform to this standard, although
some languages (C, C++) do not guarantee that this is the case.
It's a poorly written paragraph, but seems to say that C and C++ don't
guarantee adherence to the IEEE 754 standard. If this really is the
case, why don't they?
I suppose if your hardware supports something else instead of
IEEE-754, then a conforming C/C++ implementation can use the hardware,
rather than having to emulate IEEE-754.
In fact, IIRC, C predates IEEE('s very existance as an orginazation) by
IEEE is actually quite an old organization around 100 yrs, I believe.
IEEE has sections for power generation and transmission, and many others,
not just computers.
Doh! Of course, you are right. I was guessing on that. I meant to look
it up before saying such a thing, but I forgot.
However, I /believe/ I'm right when I say that it at least predates IEEE
754... which AFAICT comes from ~1987? Of course, I have no idea in what
forms it existed before it become an international standard. Certainly,
it predates C's first forray into standardization.
snip
For a long time, there has been no way in C to control floating pt modes
but I think recently some effort has been made. Rounding modes in
particular can be quite important in some computations.
I think C mostly goes with what is expedient with the hardware in use.
On x86, the hardware float registers are actually 82 bits. This can be
accessed directly with some compilers as long double But, OTOH, if you
specify double it will be expaned to long double when loaded into
a register. Now if it stays in the register through a series of operations,
the result can subtly different than if it was rounded to double after
every intermediate operation.
Yeah. Which was frustrating to implementors, because in order to be 100%
conforming, they _had_ to do the stupid truncations every single
operation. Which is why GCC added -funsafe-math-operations, I think.
So C99 (1) allowed these optimizations to take place by default, and (2)
defined a standard #pragma directive to control it (FP_CONTRACT).
Of course, this is all AIUI: I haven't nearly the intimate knowledge of
C and floating-point that many implementors and various folks at
comp.lang.c have; so better to check with them for details.
--
Micah J. Cowan
Programmer, musician, typesetting enthusiast, gamer...
http://micah.cowan.name/
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Re: [vox-tech] C - passing chars and pointer to chars
On Sun, Jun 04, 2006 at 10:05:22AM -0400, Peter Jay Salzman wrote: I gave good reasons *why* passing the pointers should always work. I think Micah really got at the heart of the matter: Micah said: Pointers to incompatible types are not guaranteed to be represented the same way, even though in practice they are. /All/ pointer types must be convertible to and from a pointer to any character type, and used as such, so this makes it all the more likely that they will be represented the same. Irregardless, the Standard does /require/ that a warning be given when you try to do this. I think the main point is the lack of guarantee that they're represented the same way. Here's what I think he means. I *think* what Micah is saying here is that even though a char and signed char types have the same width (1 byte) and are implemented the same way in practise, there's no guarantee that they *are* implemented the same way. Actually, no: char and signed char /must/ be represented the same way, if char is signed. For example, a perverse compiler writer may put a byte of dead storage (for whatever reason) in between contiguous elements of a char array and 2 bytes of dead storage in between contiguous elements of a signed char array. Well, no, it couldn't. At the very least, you must be able to convert a pointer to /anything/ to a pointer to character type, and be able to inspect the byte values in that way. I was actually talking about the fact that the /pointer/ types don't have to be represented the same way. A compiler could represent signed char pointers as a value bit-shifted two to the left, whereas a pointer to char could be a bitwise complement of the same value. Not likely, but basically, the Standard committee don't want you just passing stuff around in general without first declaring, I know what the hell I'm doing (via a cast). -- Micah J. Cowan Programmer, musician, typesetting enthusiast, gamer... http://micah.cowan.name/ ___ vox-tech mailing list vox-tech@lists.lugod.org http://lists.lugod.org/mailman/listinfo/vox-tech
Re: [vox-tech] C - passing chars and pointer to chars
On Sun, Jun 04, 2006 at 05:52:34PM -0500, Ken Bloom wrote: On Sunday 04 June 2006 13:58, Micah J. Cowan wrote: On Sun, Jun 04, 2006 at 09:57:18AM -0500, Ken Bloom wrote: On Sunday 04 June 2006 09:05, Peter Jay Salzman wrote: On Sat 03 Jun 06, 10:27 PM, Ken Bloom [EMAIL PROTECTED] said: Cue, the **Fundemental axiom of the C++ type system**, stated as follows: A* is automaitcally convertable to B* if and only if A is a B. (Likewise for pass by reference). (this is my own generalization though, and there may actually be exceptions) Although this was interesting to read, it doesn't say much other than to restate my observation in a more sophisticated way. IMO, all that matters is that the axiom is the reason. Except the axiom is rather far from the truth, only an ideal. C++ is more strongly typed than C. I am not a language theorist, but I believe it is still not considered strongly typed. The ability to silently convert from int to char (your compiler might actually complain about it in some circumstances: a compiler is allowed to complain about whatever the hell it wants, but there's no requirement to here, and in most cases, it won't) illustrates one exception, certainly. That's not an IS_A relationship. That's automatic conversion. That was exactly my point. However, on looking back, I misread your axiom to say A is automatically convertable to B if and only if... My bad. -- Micah J. Cowan Programmer, musician, typesetting enthusiast, gamer... http://micah.cowan.name/ ___ vox-tech mailing list vox-tech@lists.lugod.org http://lists.lugod.org/mailman/listinfo/vox-tech
Re: [vox-tech] C - passing chars and pointer to chars
On Fri, Jun 02, 2006 at 11:31:43AM -0400, Peter Jay Salzman wrote: char a = 0; signed char b = 0; unsigned char c = 0; a = b; a = c;// fine. b = a; b = c;// fine. c = a; c = b;// fine. You can even pass the different types of char to functions that take other types of char: void takesAChar( char x, signed char y, unsigned char z ); takesAChar(a, b, c); takesAChar(a, c, b); // fine. takesAChar(b, a, c); takesAChar(b, c, a); // fine. takesAChar(c, b, a); takesAChar(c, a, b); // fine. What the compiler complains about is passing *pointers* to different types of char: void takesACharPtr( char *x, signed char *y, unsigned char *z ); takesACharPtr(a, b, c); takesACharPtr(a, c, b); // warnings. takesACharPtr(b, a, c); takesACharPtr(b, c, a); // warnings. takesACharPtr(c, a, b); takesACharPtr(c, b, a); // warnings. The warning is: pointer targets in passing argument foo of bar differ in signedness. char is a distinct type from both signed and unsigned char. Not only that, but it is also considered incompatible with the other types, even though it is required to have precisely the same representation as one of the other two. The actual fact that it warns about pointers to chars of different /signedness/ is fairly misinformative (as then, it shoud not complain when you swap a and b only). I'm trying to understand this. I'm fairly sure the standard says that all 3 types of char must have the same width. For pointer operations like: char s[] = hello; unsigned char *cptr = s; ++cptr; putc( *cptr, stdout ); will correctly print e because char and unsigned char have the same width, and when we add one to cptr, it points to the correct location in memory. Pointers to incompatible types are not guaranteed to be represented the same way, even though in practice they are. /All/ pointer types must be convertible to and from a pointer to any character type, and used as such, so this makes it all the more likely that they will be represented the same. Irregardless, the Standard does /require/ that a warning be given when you try to do this. What I'm getting at is this. Because all the chars have the same width, it doesn't matter WHAT kind of pointer you pass in to a function: char, signed char, or unsigned char. Pointer arithmetic just works, and it works because they all have the same width. On the other hand, the data is what gets mangled if you don't use the correct type: char c = 255; printf(%d, c); prints, as expected, -1. Not 255. So it seems to me that if the compiler complains about anything, it should complain about passing a different type of char, not a different type of char *. Perhaps; but assigning between different integer types does not require a diagnostic, even when overflow occurs (as when you assign 255 to an 8-bit signed char). Why does gcc 4 complain about passing different char * and not char? Assignment between different integer types happens all the time. It's not always well-defined (for instance, assigning 255 to an 8-bit signed char invokes undefined behavior, and can cause nasal daemons to fly out your nose, as far as the Standard is concerned). And is this because of the standard or is it gcc specific? Standard. gcc3 probably didn't complain because 4 has gotten a bit more pedantic. GCC does not issue all required diagnostics, unless you also throw in a -pedantic flag. To get the maximum diagnostics, I usually invoke using -W -Wall -ansi -pedantic (if it's C90). -- Micah J. Cowan Programmer, musician, typesetting enthusiast, gamer... http://micah.cowan.name/ ___ vox-tech mailing list vox-tech@lists.lugod.org http://lists.lugod.org/mailman/listinfo/vox-tech
Re: [vox-tech] gcc and quieting warnings
On Fri, Jun 02, 2006 at 12:27:38PM -0700, Bill Kendrick wrote: On Fri, Jun 02, 2006 at 11:53:43AM -0400, Peter Jay Salzman wrote: I always use -W -Wall when I compile code. However, sometimes, I want gcc to ignore certain instances of a warning. For example, in something like a stub function, or a signal callback, or even an API function that doesn't use all the parameters, like: JNIEXPORT void JNICALL Java_HelloWorld_print( JNIEnv *env, jobject obj ) snip It may be sufficient to simply not NAME the variables, e.g.: Java_HelloWorld_print(JNIEnv*, jobject) ... Unfortunately, C doesn't allow you to do that (C++ does...). -- Micah J. Cowan Programmer, musician, typesetting enthusiast, gamer... http://micah.cowan.name/ ___ vox-tech mailing list vox-tech@lists.lugod.org http://lists.lugod.org/mailman/listinfo/vox-tech
Re: [vox-tech] K3B problem
On Tue, May 30, 2006 at 10:53:09PM -0700, Chris Horsting wrote: Micah J. Cowan wrote: On Mon, May 29, 2006 at 10:16:13PM -0700, Chris Horsting wrote: Hi, I am using Fedora 4.0 and when I tried to copy a CD with k3B I was unsuccessful. I got an error the following error: Unable to eject media It sounds to me like your desktop may be attempting to automatically mount the CD while it's being burned. Have you made sure to disable that? No, I have not tried to disable that. Do I do that through K3B or KDE? ^^^ Careful: I almost didn't spot your input in there, since it was hidden with your quote of my message. I'm afraid I don't actually know how you would go about doing that; probably a control panel somewhere. Can someone else give pointers? -- Micah J. Cowan Programmer, musician, typesetting enthusiast, gamer... http://micah.cowan.name/ ___ vox-tech mailing list vox-tech@lists.lugod.org http://lists.lugod.org/mailman/listinfo/vox-tech
Re: [vox-tech] K3B problem
On Wed, May 31, 2006 at 12:16:34PM -0700, Jan W wrote: --- Micah J. Cowan [EMAIL PROTECTED] wrote: On Tue, May 30, 2006 at 10:53:09PM -0700, Chris Horsting wrote: Micah J. Cowan wrote: It sounds to me like your desktop may be attempting to automatically mount the CD while it's being burned. Have you made sure to disable that? No, I have not tried to disable that. Do I do that through K3B or KDE? I'm afraid I don't actually know how you would go about doing that; probably a control panel somewhere. Can someone else give pointers? There are a couple of things to do: 1. /etc/rc.d/init.d/autofs stop This will stop automounter services. But the service will probably come up again on reboot, so you would want to do: I was thinking that might not be enough on some setups. Don't some desktops actually use helper daemons of their own, or somesuch, to achieve the desired automounting? Or do they all just use autofs at some level? -- Micah J. Cowan Programmer, musician, typesetting enthusiast, gamer... http://micah.cowan.name/ ___ vox-tech mailing list vox-tech@lists.lugod.org http://lists.lugod.org/mailman/listinfo/vox-tech
Re: [vox-tech] K3B problem
On Mon, May 29, 2006 at 10:16:13PM -0700, Chris Horsting wrote: Hi, I am using Fedora 4.0 and when I tried to copy a CD with k3B I was unsuccessful. I got an error the following error: Unable to eject media It sounds to me like your desktop may be attempting to automatically mount the CD while it's being burned. Have you made sure to disable that? -- Micah J. Cowan Programmer, musician, typesetting enthusiast, gamer... http://micah.cowan.name/ ___ vox-tech mailing list vox-tech@lists.lugod.org http://lists.lugod.org/mailman/listinfo/vox-tech
Re: [vox-tech] Video File Format
On Sat, May 20, 2006 at 11:44:48PM -0700, Alex Mandel wrote: I was always under the impression that .avi was a fairly standard and easy to use format for video, most of what I download from the web is in this format. But I'm finding editing with Avi's in linux to be a pain. What formats do people recommend encoding to if I want to edit in linux. I have tools in windows to convert to just about whatever I want I'm just not sure what a great choice is. In the end I probably want to create downloadable files and author Dvds in cross platform compatibilty. Suggestions, experiences? Alex Open standards are best. AVIs are fine, except that almost all of them get done using proprietary codecs, which ruins it. MPEG-2 is probably the way to go, especially if you're planning on authoring DVDs (which use MPEG-2). -- Micah J. Cowan Programmer, musician, typesetting enthusiast, gamer... http://micah.cowan.name/ ___ vox-tech mailing list vox-tech@lists.lugod.org http://lists.lugod.org/mailman/listinfo/vox-tech
Re: [vox-tech] regex help - matching literal []
On Fri, Apr 28, 2006 at 03:45:25PM -0700, Kenneth Herron wrote: Micah J. Cowan wrote: On Fri, Apr 28, 2006 at 04:19:34PM -0500, Ken Bloom wrote: Target exception: java.util.regex.PatternSyntaxException: Unclosed character class near index 5 [[].*] ^ java.util.regex.PatternSyntaxException: Unclosed character class near index 5 [[].*] ^ Then it violates POSIX regex syntax. That's a broken response, IMO. I've been reading http://www.opengroup.org/onlinepubs/009695399/basedefs/xbd_chap09.html and http://www.opengroup.org/onlinepubs/007908799/xbd/re.html, and perhaps I'm missing it but they don't seem to support your assertion. No, those are the references I use as well. And of course google doesn't allow searching for punctuation. I'd appreciate it if you would explain how [[].*] is valid, or point to some source that supports your position. Well, I'm not sure I understand what you're saying: you yourself seem to prove the validity of the RE in your final sentence below. However, in the SUSv3 spec you cited, the proof is in the grammar, and also (easier to read) in 9.3.5, point #1, where it says that the [ character loses its special meaning from within a bracket expression. It would have a /new/ special meaning /if/ it were part of a character class, collation class, or equivalence class; but it's none of those, so what you have is [[] = literal [. The final ] of my RE isn't special (since there's no active character class), so it's literal. Besides which, Peter was trying to match [ and ] individually. A single RE that matches either character isn't what he wanted. Does [[].*] match [ or ]? A single RE that matches either character isn't what I provided. [[] means a character group consisting of the single character, [. ObAlternateSolution: the expression [[] matches [, []] matches ], and [[][]] matches []. If you'll look closer, you'll see that's exactly what I did. But Java doesn't support it(!). -- Micah J. Cowan Programmer, musician, typesetting enthusiast, gamer... http://micah.cowan.name/ ___ vox-tech mailing list vox-tech@lists.lugod.org http://lists.lugod.org/mailman/listinfo/vox-tech
Re: [vox-tech] Automating web site interaction
On Mon, Apr 10, 2006 at 11:12:17AM -0700, Bruce Wolk wrote: Does anyone have a recommendation for some software that I can run as a cron job to go to a specific website, autheticate itself on a login web page with a userid and password, then go to a specific page on the site and mimick a button click? You can use GNU wget to do this; however, it will require some knowledge of web programming: the specifics of how this will work is entirely different for different sites, and a little complicated. Bottom line is, if you're not pretty familiar with web programming (HTML/CGI) and with wget, you'll need to get someone to do this for you, I think. -- Micah J. Cowan Programmer, musician, typesetting enthusiast, gamer... http://micah.cowan.name/ ___ vox-tech mailing list vox-tech@lists.lugod.org http://lists.lugod.org/mailman/listinfo/vox-tech
Re: [vox-tech] Must a 300 microsecond delay keep the CPU busy?
On Tue, Apr 04, 2006 at 01:16:07PM -0700, Ted Deppner wrote:
if (mlockall(MCL_FUTURE)) { perror(mlockall); exit(1); }
Might he want to bitwise-or that with MCL_CURRENT? Otherwise, isn't
swapping (of the preexisting page[s]) still a possibility?
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http://micah.cowan.name/
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Re: [vox-tech] Must a 300 microsecond delay keep the CPU busy?
On Tue, Apr 04, 2006 at 02:52:08PM -0700, Ted Deppner wrote:
On Tue, Apr 04, 2006 at 02:26:11PM -0700, Micah J. Cowan wrote:
On Tue, Apr 04, 2006 at 01:16:07PM -0700, Ted Deppner wrote:
if (mlockall(MCL_FUTURE)) { perror(mlockall); exit(1); }
Might he want to bitwise-or that with MCL_CURRENT? Otherwise, isn't
swapping (of the preexisting page[s]) still a possibility?
That sounds right. It's been years since I used these... I had to dust
off some bits and refer a several archived no-longer-running machine
backups to dig up that code. :)
I've never used it; but I found it interesting enough to lookup after
you referred to it. :-)
BTW, this is also used for security concerns, right? To prevent
sensitive (eg, decrypted) data from getting to disk? I seem to remember
gnupg spitting out warnings that it couldn't do something like this, if
it wasn't run with privileges...
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Re: [vox-tech] OT: Licensing
On Mon, Mar 13, 2006 at 05:25:23PM -0800, Alex Mandel wrote: 1. I wrote a python GUI application on windows. 2. Everything is open source in it except for the COM library that connects into Access databases, MSVCR71.dll (At least I think that's in this one, although reading on the python lists, it sounds like it's part of python.) What are my options for Licensing this program, I'm overwhelmed by the lists on this topic. GPL or LGPL would be preferable since I really want my code open, I just don't know if I can pass around that windows dll or not. You could make it GPL, with a special exemption that it may be linked with proprietary DLLs for interfacing with Access. -- Micah J. Cowan [EMAIL PROTECTED] ___ vox-tech mailing list vox-tech@lists.lugod.org http://lists.lugod.org/mailman/listinfo/vox-tech
Re: [vox-tech] Pdf Viewers
On Fri, Mar 10, 2006 at 09:02:43AM -0800, Bob Scofield wrote: I just made a disappointing discovery. I was playing around with a DMV form and learned that with the Adobe Reader (in SuSE) I could type into the form. But in Debian neither XPDF nor KPDF would let me type. So it seems that the open source readers are limited in ways that Adobe is not. I've read the KPDF Handbook, and there is no mentioned of typing into a form. Well, it's limited in a few other ways as well: The PDF format allows you to embed movies, sounds, javascript, etc. I don't know for sure, but I doubt xpdf supports any of those (and, IIRC, kpdf is a fork from xpdf). So have I discovered a fact of life, or does someone know how to configure an open source reader to type into a pdf document? Probably a fact of life. I'm sure that AcroForms is an eventual goal, but probably won't be coming for a while. You may need to resign yourself to acroread. :-( -- Micah J. Cowan [EMAIL PROTECTED] ___ vox-tech mailing list vox-tech@lists.lugod.org http://lists.lugod.org/mailman/listinfo/vox-tech
Re: Fwd: RE: [vox-tech] bash: ls: command not found
On Tue, Feb 28, 2006 at 11:43:25AM -0800, Bill Kendrick wrote: bash: ls: command not found This is a new workstation that we got from our IT department and I've been able do get around on it before... What do I need to do to fix this? Thanks in advance, Joey I have the same problem, could you help me? thank a lot. Have you checked to see if your problem was the same as the original poster's? Please give us the results of the following command lines (after subscribing so we can receive further mails from you): $ echo $PATH $ type ls $ which ls $ whereis ls $ /bin/ls -- Micah J. Cowan [EMAIL PROTECTED] ___ vox-tech mailing list vox-tech@lists.lugod.org http://lists.lugod.org/mailman/listinfo/vox-tech
Re: [vox-tech] Creating large ramdisks
On Mon, Feb 20, 2006 at 01:05:16PM -0800, Ken Herron wrote: John Wojnaroski wrote: Hi, Is there a way to create large ramdisks (around 200meg) that act as a single partition? I seem to recall seeing something on the topic a few weeks ago while surfing, but now can't seem to locate the site by googling when I need it? Sure, it's a filesystem type called tmpfs. All of the memory for file storage is taken from the system's virtual memory (ie swap space). For example, I use this entry in /etc/fstab for my /tmp directory: tmpfs /tmptmpfs size=512m 0 0 Yeah, but if it uses swap, doesn't that sorta defeat the probable purpose of a ramdisk partition? I'm pretty sure there's something that will do this, but I don't recall what it was... -- Micah J. Cowan [EMAIL PROTECTED] ___ vox-tech mailing list vox-tech@lists.lugod.org http://lists.lugod.org/mailman/listinfo/vox-tech
Re: [vox-tech] benchmarking (again)
On Fri, Feb 17, 2006 at 04:16:29PM -0500, Peter Jay Salzman wrote: On Fri 17 Feb 06, 12:00 PM, Mark K. Kim [EMAIL PROTECTED] said: On Fri, Feb 17, 2006 at 11:13:42AM -0500, Peter Jay Salzman wrote: And I've read that java allocates memory for all data items on the heap, which is never stored in L1 cache while for C and C++, temporary objects are often put into the L1 cache. I think you mean CPU registers? L1/L2/L3 caches are just buffers between RAM and the CPU registers, and all data allocated in RAM, stack or heap, go through L1 cache at some point. Programming languages or compilers have no direct memory allocation access of the caches. I was under the impression that this is what computer scientists call locality of data -- if data is used once, it'll be used again soon. The strategy that attempts to exploit locality of data is to hold recent data in L1 cache. I read that in an article on Java World on optimizing Java programs. Yes, but to my understanding, there is no direct software access to the L1 or L2 (etc) caches: the CPU does all the decision making regarding what gets into the cache, and there are no (to my knowledge) instructions to give direction on this. Anyway, wouldn't the details of data items getting allocated in the heap/stack/register depend on the JVM and the JIT compiler? Objects, would have to be allocated in the heap, but simple data types like double can certainly be temporarily allocated in a CPU register until it's out of scope, no matter what the Java standard may say, if the JIT compiler, for example, determines it can be done safely and can speed up the execution. I see what you mean. Yeah, but the question still remains -- what's going on with the user time in java apps, and why does the program run faster in Java than C++? Certainly C++ compilers know how to do all that stuff too. The Cygwin argument somebody put forth seems like it might be an explanation... I really don't want to comment too much until I actually get to see what assembly code gets generated from a given C or C++ test... -- Micah J. Cowan [EMAIL PROTECTED] ___ vox-tech mailing list vox-tech@lists.lugod.org http://lists.lugod.org/mailman/listinfo/vox-tech
Re: [vox-tech] benchmarking (again)
On Fri, Feb 17, 2006 at 02:03:36PM -0800, Mark K. Kim wrote: As Jeff pointed out, Cygwin can be a bit of an oddball. I'm not sure what happens if you run `time` on a non-Cygwin program like a JVM. Also, I'm not sure what JVM considers system and user time -- if the whole program gets executed by the JVM as a system driver then system time is what C++ would consider a user time. Try the code under Linux. It should give more accurate measurements. Or, you might try mingw. -- Micah J. Cowan [EMAIL PROTECTED] ___ vox-tech mailing list vox-tech@lists.lugod.org http://lists.lugod.org/mailman/listinfo/vox-tech
Re: [vox-tech] windows support, unfortunately
On Mon, Feb 06, 2006 at 02:19:39PM -0500, Peter Jay Salzman wrote: Hi all, At work I have to use WinXP, but all of my development is with open source tools like cygwin, miktex, etc., so I'm almost happy. This morning a bad thing happened. Adobe Acrobat wanted to install an update 7.0.5 on my work computer, and stupidly, I allowed it. It wanted to reboot to finish the upgrade, and again, I allowed it. Unfortunately, after the reboot, my system has become flakey. Here are some manifestations: snip It's an obvious one, but I'm obliged to ask it: have you tried /uninstalling/ Acrobat, and if so, did it make a difference? Also, is your desktop backed-up? The reason why I'm posting to vox-tech is that one of the help desk guys noted that i have a lot of illegal software. this is the term he actually used; i'm not making that up. he was referring to firefox, putty, miktex, gvim, cygwin, etc. he said i have to uninstall the illegal and unsupported software to fix the machine. IMO, this is worth making an issue of. All of these are extremely legal to have on your machine, and it is worth making the support guy understand this. Now, some of it /may/ be against company rules: but since you mentioned that you use cygwin to do development, I sincerely doubt it. Beat this into the support guy's head. Actually, a good tactic is to ask /him/ questions, and make him answer them reasonably. Most answers from these sorts of people will reveal more questions to ask. How, exactly, is Firefox (e.g.) illegal to install? How did you learn this (from the answer to previous)? What do you think about (appropriate link to strong materials denying the truthfulness of his previous answer)? I've got a better idea. I'm going to try to fix whatever is wrong without uninstalling my illegal software. Hence, the post to vox-tech. First, everything points to the Acrobat upgrade, since that is the only thing that occured in between the time the system was good and not good. But this hardly matters. Any ideas? Many of the things seem to point towards permissions problems. The filesystem is NTFS. Is there a notion of permissions and file ownership on NTFS? If so, if I didn't have access to read a *.lnk file, would explorer tell me the link is not valid like I see in point #1 above? Yes, but it's not quite like Unix. you should be able to access it under Properties or something: certainly somewhere under the right-click context menu (sorry: running Linux from work at the moment, so can't give you better details). Many of the problems feel like permissions problems to me. Could some kind of permission problem conceivably cause problem #2 above? I would think so. I don't have the admin password for this computer, but I noticed a utility on the web that obtains the admin password on XP machines. Actually *changing* the admin password is out of the question, for obvious reasons. Actually snooping it may be a bad idea as well. You can certainly get fired for such activity, and probably jail time, depending on the judge. If you must use this, make it a last resort. Probably the one right after attempting to reinstall your system, reinstalling cygwin, etc on top of a fresh install. -- Micah J. Cowan [EMAIL PROTECTED] ___ vox-tech mailing list vox-tech@lists.lugod.org http://lists.lugod.org/mailman/listinfo/vox-tech
Re: [vox-tech] windows support, unfortunately
On Mon, Feb 06, 2006 at 04:26:08PM -0500, Peter Jay Salzman wrote: On Mon 06 Feb 06, 1:11 PM, Micah J. Cowan [EMAIL PROTECTED] said: On Mon, Feb 06, 2006 at 02:19:39PM -0500, Peter Jay Salzman wrote: Hi all, At work I have to use WinXP, but all of my development is with open source tools like cygwin, miktex, etc., so I'm almost happy. This morning a bad thing happened. Adobe Acrobat wanted to install an update 7.0.5 on my work computer, and stupidly, I allowed it. It wanted to reboot to finish the upgrade, and again, I allowed it. Unfortunately, after the reboot, my system has become flakey. Here are some manifestations: snip It's an obvious one, but I'm obliged to ask it: have you tried /uninstalling/ Acrobat, and if so, did it make a difference? Also, is your desktop backed-up? Thanks, Micah. After the Acrobat update, I seem to have completely lost the ability to install and uninstall programs. Most of the time it says that I need admin privs. Some of the time it says it can't access a particular .dll or it can't find a particular file. Before this whole thing started, I was able to install/uninstall programs just fine. See: this is weird in and of itself: if you were able to install/uninstall programs most of the time, chances are **REALLY** good that your user /had/ Admin privs. Ask the support guy (shudder) if this has changed recently? The reason why I'm posting to vox-tech is that one of the help desk guys noted that i have a lot of illegal software. this is the term he actually used; i'm not making that up. he was referring to firefox, putty, miktex, gvim, cygwin, etc. he said i have to uninstall the illegal and unsupported software to fix the machine. IMO, this is worth making an issue of. All of these are extremely legal to have on your machine, and it is worth making the support guy understand this. Now, some of it /may/ be against company rules: but since you mentioned that you use cygwin to do development, I sincerely doubt it. Beat this into the support guy's head. Actually, a good tactic is to ask /him/ questions, and make him answer them reasonably. Most answers from these sorts of people will reveal more questions to ask. How, exactly, is Firefox (e.g.) illegal to install? How did you learn this (from the answer to previous)? What do you think about (appropriate link to strong materials denying the truthfulness of his previous answer)? I think his intent was it's against company policy, but I'll try this tactic. Well, against company policy is another issue entirely. You could try to get that changed, but... Thing is, your boss knows your developing with cygwin, right? So how can it be against company policy? Somewhat more likely: against MIS policy... I don't have the admin password for this computer, but I noticed a utility on the web that obtains the admin password on XP machines. Actually *changing* the admin password is out of the question, for obvious reasons. Actually snooping it may be a bad idea as well. You can certainly get fired for such activity, and probably jail time, depending on the judge. Woof! Yeah, I definitely don't want to lose my job. ;) If you must use this, make it a last resort. Probably the one right after attempting to reinstall your system, reinstalling cygwin, etc on top of a fresh install. Unfortunately, my hands are completely tied now; I can't install or uninstall anything. It's almost as if my user account went from 'admin' or 'power user' to 'restricted user'. Maybe tomorrow I should try calling support again and telling them that I can no longer install/uninstall software? I really don't know what else to do, and you have me too spooked to try to change my user permissions now... No, no, I meant install WinXP afresh (or the company's baseline image), and install things over that. You can do that if you have access to the machine... (but you may need MIS's permission/help). Didn't mean to spook you... figured you already guessed as much. And it really depends on the employer: some will be sympathetic, some won't. But with an IS department like that, I'm thinking it's wiser to avoid. As far as changing your own user permissions: as I previously noted, it seems very likely that you once /had/ Admin permissions. If you can ascertain that this was true, then it seems justifiable to get them back (although, again, illicitly gaining access to the Admin account itself may not be a good idea). As far as getting fired over stuff: just keep in mind, a guy can pretty much get fired for whatever reason the company wants--including quite illegal reasons--provided the company never tells anyone why the guy's getting fired, and nobody can prove the reason beyond a reasonable doubt. So even if there's not a legal case against such (though I'm certain DMCA
Re: [vox-tech] windows support, unfortunately
On Mon, Feb 06, 2006 at 01:46:30PM -0800, MB wrote: I have hosed up many windoze boxes ;) Are you /sure/? IME, they tend to be quite adept at doing that themselves. :-) (Disclaimer: I can't actually claim this to be true anymore; XP seems to be a quite more stable platform than its predecessors, and I can't recall actually having to reinstall it yet.) -- Micah J. Cowan [EMAIL PROTECTED] ___ vox-tech mailing list vox-tech@lists.lugod.org http://lists.lugod.org/mailman/listinfo/vox-tech
Re: [vox-tech] grokking g++ errors
On Thu, Feb 02, 2006 at 02:59:35PM -0500, Peter Jay Salzman wrote: On Thu 02 Feb 06, 10:21 AM, Jeff Newmiller [EMAIL PROTECTED] said: You didn't ask for assistance in actually troubleshooting this problem, but templates traditionally must be defined before they are instantiated in the source. It is possible that newer compilers can handle definition after instantiation, but I don't know how they do it. Sorry for being so dense, but I'm just now starting to try to really learn function and class templates. Do you mean that the template function definition must be seen before the any calls to the function is made (I assume that's the instantiation)? I guess what I'm asking is -- is the template function's prototype not enough? The actual definition must be seen before any calls to the function are made? IIRC this should not be true (though I'll point out that in your sample code, no such prototype has been provided); however, for many implementations, it is. You may also need to explicitly tell g++ to instantiate that template into an actual function definition. Something like: template void split(const string str, back_insert_iteratorvectorstring); but that may not be necessary. Realize that defining a function /template/ does not define any function, only a template. That's what /instantiating/ the template does. It makes it easy on the compiler if the function template's definition is in scope at the time you implicitly or explicitly instantiate it, and some compilers may require this, though the C++ stnadard does not (only that it's in the same translation unit somewhere). I'd be happy to help you debug the problem if you want to give me access to the actual code. -- HTH, Micah J. Cowan [EMAIL PROTECTED] ___ vox-tech mailing list vox-tech@lists.lugod.org http://lists.lugod.org/mailman/listinfo/vox-tech
Re: [vox-tech] using windows pathnames in cygwin
On Tue, Jan 31, 2006 at 04:37:03PM -0800, Jeff Newmiller wrote: I've never used gvim.exe, but one of the issues that comes up in using Windows versions of posix tools in cygwin is the newline problem... the windows versions may or may not handle the normal cygwin LF newlines properly. gvim probably can... others don't always. Can't you use set fileformat? ___ vox-tech mailing list vox-tech@lists.lugod.org http://lists.lugod.org/mailman/listinfo/vox-tech
Re: [vox-tech] using windows pathnames in cygwin
On Tue, Jan 31, 2006 at 06:49:08PM -0800, Jeff Newmiller wrote: Micah J. Cowan wrote: On Tue, Jan 31, 2006 at 04:37:03PM -0800, Jeff Newmiller wrote: I've never used gvim.exe, but one of the issues that comes up in using Windows versions of posix tools in cygwin is the newline problem... the windows versions may or may not handle the normal cygwin LF newlines properly. gvim probably can... others don't always. Can't you use set fileformat? I don't know... in what context? As a gvim command? Quite possibly... but as I said I don't use gvim so you tell me... Ah. I missed that. In the context of POSIX tools in cygwin, then: when you install cygwin, it gives you the option of whether to use Windows or Unix line-endings, so that's probably a source of your trouble. I don't know where you go to reconfigure that. -- Micah J. Cowan [EMAIL PROTECTED] ___ vox-tech mailing list vox-tech@lists.lugod.org http://lists.lugod.org/mailman/listinfo/vox-tech
Re: [vox-tech] using windows pathnames in cygwin
On Tue, Jan 31, 2006 at 02:17:49PM -0800, Micah J. Cowan wrote: I've got a shortcut on my desktop that launches X with an xterm. I'm pretty sure I found it in either $CYGROOT/usr/bin or $CYGROOT/usr/X11R6/bin. I'll let you know what it is when I get home, unless you find it first. You should have a file startxwin.bat in your /usr/X11R6/bin. Copy a shortcut to that to your desktop. snip However, it may interest you to know that the fact that xterm and other clients pop up alongside the other Windows apps is a relatively recent /feature/ (root-less X). You can disable it in your XF86Config, I believe. Apparently, you can get the right setting by editing the invocation of XWin in the startxwin.bat file I just mentioned the -multiwindow option is what you probably have enabled, and activates the integrated Windows-based window manager. The -rootless option actually uses a /transparent/ root window with an external window manager. You probably want to use the -fullscreen option, which does the normal X thing. Then you'd want to replace the (commented-out) line that starts twm with whatever wm you'd like to enjoy. HTH, Micah ___ vox-tech mailing list vox-tech@lists.lugod.org http://lists.lugod.org/mailman/listinfo/vox-tech
Re: [vox-tech] update on the audio CD problem
On Thu, Jan 26, 2006 at 11:51:08PM -0800, Norm Matloff wrote: I then turned to my daughter's machine. I had thought this one would be harder, since the symptoms there had been worse. But it turned out to be a very simple problem in that case: The file permissions on /dev/hdc were not set correctly. :-) I've noticed that Fedora resets permissions on these things from time to time. Make sure you did it the approved way (which, unfortunately, I don't remember). But just manually running chmod is not going to work. You'll have to google for this one, I'm afraid (unless someone onlist remembers how you're supposed to do it). -- Micah J. Cowan [EMAIL PROTECTED] ___ vox-tech mailing list vox-tech@lists.lugod.org http://lists.lugod.org/mailman/listinfo/vox-tech
Re: [vox-tech] update on the audio CD problem
On Fri, Jan 27, 2006 at 04:05:23PM -0500, Peter Jay Salzman wrote: On Fri 27 Jan 06, 12:50 PM, Bill Kendrick [EMAIL PROTECTED] said: On Fri, Jan 27, 2006 at 05:06:09AM -0500, Peter Jay Salzman wrote: Digital extraction is where the cd is read, and the signal gets pumped through the ATA port to your speakers. This is more efficient from the CPU's standpoint. Woah, I would think this is way LESS efficient. No. The CPU is involved in many read-copy operations when the signal passes through the sound card. AFAIK, the north and south bridge use DMA during digital extraction. Pete, I'm pretty sure that the CPU isn't even /involved/ with analog mode. It's analog. There is no read/copy. There's nothing to read/copy. -- Micah J. Cowan [EMAIL PROTECTED] ___ vox-tech mailing list vox-tech@lists.lugod.org http://lists.lugod.org/mailman/listinfo/vox-tech
Re: [vox-tech] update on the audio CD problem
On Fri, Jan 27, 2006 at 07:30:50PM -0500, Peter Jay Salzman wrote: On Fri 27 Jan 06, 2:27 PM, Micah J. Cowan [EMAIL PROTECTED] said: On Fri, Jan 27, 2006 at 04:54:14PM -0500, Peter Jay Salzman wrote: On Fri 27 Jan 06, 1:17 PM, Micah J. Cowan [EMAIL PROTECTED] said: On Fri, Jan 27, 2006 at 04:05:23PM -0500, Peter Jay Salzman wrote: On Fri 27 Jan 06, 12:50 PM, Bill Kendrick [EMAIL PROTECTED] said: On Fri, Jan 27, 2006 at 05:06:09AM -0500, Peter Jay Salzman wrote: Digital extraction is where the cd is read, and the signal gets pumped through the ATA port to your speakers. This is more efficient from the CPU's standpoint. Woah, I would think this is way LESS efficient. No. The CPU is involved in many read-copy operations when the signal passes through the sound card. AFAIK, the north and south bridge use DMA during digital extraction. Pete, I'm pretty sure that the CPU isn't even /involved/ with analog mode. It's analog. There is no read/copy. There's nothing to read/copy. sure there is. data needs to be copied from kernel space to user space. that _definitely_ requires the CPU. that's why the whole zero-copy user-space access was such a big deal. Kernel space? What the heck are you talking about? There is a direct analog connection from the CD drive to the sound card. It doesn't ever even touch the mother board. The signal sure as hell isn't routed out through the soundcard to the motherboard, and then back into the soundcard. No kernel, user, or any other sort of space is involved. It's an analog signal, which isn't even representable in kernel or user space unless you convert it to digital, which kind of defeats the purpose. 1. read() is performed on a block file device to obtain sound data. 2. write() is performed to write the data to the sound char device file. it looks like this: read(drive_fd, buffer, size); write(sound_fd, buffer, size); the kernel performs these system calls in kernel mode on behalf of the application. the data is read into kernel space, and recopied into userspace no fewer than 4 times. You've /just/ described digital extraction. BTW, DMA is (typically) used in the read above: that's what you've been referring to. It would be /impossible/ to refer to the above as analog, since, at the end of it, you have the data in buffer, which is of course, digital, by its very nature. But I'm curious: if the above is analog, then what does digital look like? if you don't understand me, or don't believe me, i'll do the google search and post a link that explains this. I already did. Check a message or two back. Or try it yourself. Here is the previous link, along with another. http://www.epanorama.net/documents/pc/cdrom_audio_wire.html http://www.smart-projects.net/isobuster/help/noframes/hs210.htm Or, hey, you could look at the source to XMMS's cdaudio plugin, and see what it does under Digital Extraction Mode. Here's a summary. Digital Extraction Mode: dae_play_loop() gets called, which does plenty of read()s and write()s. Yes, DMA /may/ be involved (depending on your hdparm settings). But it definitely gets copied into user space and back. Analog Mode: seek() gets called (a local function, poorly named IMO), which does a single ioctl() to the CD device file. ps- i'm not sure how you can claim that no kernel, user, or any other space is involved when we're talking about I/O to hardware device files. That's /exactly/ my point. There is no read/write from any device files, whatever. There is an ioctl()--to your CD drive device file, and not the sound card device file. That's it. The actual signal is never, ever in core memory (or swap). The motherboard (and CPU, and therefore software) never sees it. And I can't believe we're still even discussing this. Please give me a reliable reference, from google or whatever, or let's stop now. -- Micah J. Cowan [EMAIL PROTECTED] ___ vox-tech mailing list vox-tech@lists.lugod.org http://lists.lugod.org/mailman/listinfo/vox-tech
Re: [vox-tech] Need to bypass Squid proxy
On Thu, Jan 26, 2006 at 01:01:18PM -0600, Ken Bloom wrote: Ehrhart, Jay wrote: I have a Linux proxy server filtering all my outbound web traffic. All traffic leaving the proxy assumes the proxy IP address. I have an internal web site and I need that web server to see the originating IP address of my internal web traffic. How can I make that one IP address or url bypass the proxy? Can I use Squid or iptables and if so how do I set it up? In addition to what everyone else said, if it's a transparent proxy that you have no control over, you can connect by HTTPS. I don't know of any proxy that can proxy an encrypted connection. If it's not transparent, it can (the CONNECT method). But, yeah, I don't see how a transparent one could do that. -- Micah J. Cowan [EMAIL PROTECTED] ___ vox-tech mailing list vox-tech@lists.lugod.org http://lists.lugod.org/mailman/listinfo/vox-tech
Re: [vox-tech] Need to bypass Squid proxy
On Thu, Jan 26, 2006 at 11:41:28AM -0800, MB wrote: Unfortunately (or fortunately), squid WILL proxy SSL and regular web sessions. It will also proxy other connections like ftp. Squid happens to be a *very* powerful proxy. I'm aware that squid will proxy SSL, at least on non-transparent connections (I do that often). I don't see how it can do that transparently: It doesn't know the server's private key. It could use a totally /separate/ key to pretend to be the server, and then pretend to be the client to the server, but that would be wrong, wrong, WRONG, and I very much doubt the developers of squid make it do that. -- Micah J. Cowan [EMAIL PROTECTED] ___ vox-tech mailing list vox-tech@lists.lugod.org http://lists.lugod.org/mailman/listinfo/vox-tech
Re: [vox-tech] Need to bypass Squid proxy
On Thu, Jan 26, 2006 at 12:43:47PM -0800, Seth Nagao wrote: On 1/26/06, Micah J. Cowan [EMAIL PROTECTED] wrote: I'm aware that squid will proxy SSL, at least on non-transparent connections (I do that often). I don't see how it can do that transparently: It doesn't know the server's private key. It could use a totally /separate/ key to pretend to be the server, and then pretend to be the client to the server, but that would be wrong, wrong, WRONG, and I very much doubt the developers of squid make it do that. Interestingly enough, I went to an ISSA meeting which included a vendor that intended to do EXACTLY that. The line of thought went something like, Well, we're the good guys, so it's not really a MITM attack. I'll see if I can find the info I have on them next time I'm in the office. I've been curious of what legal implications that such a proxy might incur if a breach of security happened at that point, but that might be covered in the big nasty legal documents you often have to sign. There are concerns in doing this, even from the vendor point of view. For instance, since you can't get a trusted certificate authority to give you a signature for the destination server you're pretending to be, the user's browser (if it's any good) will always through up a WARNING: not signed by a trusted provider or WARNING: certificate doesn't belong to the site they're claiming to be. So, being able to do this transparently is pretty limited. And once users realize what's going on, several of them are liable to become PISSED. And, documents or not, I'm willing to bet that if a security breach happened at that point, you can sue their friggin' ass off. Deployed against employees at a corporation, you could probably sue the employer's ass off, too: and they probably didn't think hard enough about it to make you sign documents anyway. All in all, a much better alternative, if you really want to have absolute* control over what goes out over your network, is to simply disallow outgoing HTTPS altogether. Let them check their bank accounts from home, etc. :-) Clearly, these guys had not thought things through. And no sysadmin worth his salt would buy such a product (and, if he were forced to, would never enable such a stupid feature). *Practically, no such thing. Even if we do this, what's to prevent someone from setting up their /own/ proxy over permitted channels? Someone once implemented IP-over-email to illustrate circumvention of firewalls... -- Micah J. Cowan [EMAIL PROTECTED] ___ vox-tech mailing list vox-tech@lists.lugod.org http://lists.lugod.org/mailman/listinfo/vox-tech
Re: [vox-tech] Need to bypass Squid proxy
On Thu, Jan 26, 2006 at 01:38:54PM -0800, Ehrhart, Jay wrote: I don't think I made what I want to accomplish clear. I am at a county office of Education. By law all web traffic to the real Internet must be filtered. I have a Red Hat Linux server running N2H2 web filtering. It is a transparent proxy. All traffic goes through the proxy filter and there is no way around it. I have an internal web server that is only for the schools and is not publicly accessible. The proxy server does its job and sends the traffic out where it dies on the outside of my publicly facing firewall. I want to bypass the proxy with squid or iptables so that the private sites can reach the private web site. I realize this. The message you're responding to was something of a tangent. So, it is a transparent proxy, and editing your Connection Settings won't work. Any changes made must be done at the proxy server, or at a routing level. First off: as things currently stand, does traffic directed at the private web server actually get there (though redirected from the proxy server)? If not, then you need to make sure that the proxy knows how to direct traffic there. Now, if things are getting to the private web server, but always show the IP address from the proxy server, there's a couple options. The easiest, if you are able to make the appropriate adjustments at the web server, is to comprehend and correctly interpret the HTTP X-Forwarded-From (non-standard) header that your proxy should be emitting. Another option is to configure the proxy server to directly forward IP packets to the internal web server, virtually unchanged (that is, with the original source IP address intact). If you're not using Linux, I can't help you there (it may not be possible). But your best option would be to ensure that the routing tables of the machines on your network don't direct intranetwork traffic through the proxy. If you're using DHCP, then it's the DHCP server you need to configure for this. HTH, Micah ___ vox-tech mailing list vox-tech@lists.lugod.org http://lists.lugod.org/mailman/listinfo/vox-tech
Re: [vox-tech] playing an audio CD
On Tue, Jan 24, 2006 at 02:10:06PM -0800, Norm Matloff wrote: Being as busy as I am, unfortunately almost all of my work with computers is serious, e.g. no game playing. :-( Now my 14-year-old daughter has suddenly decided she wants to become a Linux user. Yay! But I can't seem to get either her Linux machine or mine to play music from audio CDs, something of absolutely prime importance to her. :-) This is gonna be a dealbreaker for her, so we risk losing a potential Linux enthusiast. Thus any help you people can give me would be much appreciated. See if your CD player has a Direct digital playback option or similar. This may fix the silent success problem. I can tell you how you might get it to work using xmms... The fact that the slider is going but nothing is playing, /might/ indicate that the CD drive's audo output cable isn't plugged into the sound-card's input jack. XMMS lets you deal with this situation gracefully. If you click on the upper-left icon, you will get a menu. Goto Options and select Preferences. On the Audio I/O Plugins tab, select CD Audio Player and hit the Configure button. Make sure that the Device field has the correct device file on it, and use any intuitive path for the Directory field. When you tell XMMS to Play Directory on that directory, it will automagically load your Audio CD (if it has been configured correctly). If you're having trouble getting the sound to play (same situation as you're currently seeing in CD Audio Player), select Digital audio extraction instead of Analog. HTH, Micah ___ vox-tech mailing list vox-tech@lists.lugod.org http://lists.lugod.org/mailman/listinfo/vox-tech
Re: [vox-tech] java
On Fri, Jan 20, 2006 at 03:29:34PM -0800, Matin Hashemi wrote: I want to install a program from its source distribution, and unfortunately the source is in java which I don't know anything about! The package Makefile use Jikes (IBM java compiler), so I installed the jikes first. But I get this error when trying to make: ** jikes -nowarn +F -g at/dms/compiler/tools/lexgen/Main.java Found 1 system error: *** Semantic Error: You need to modify your classpath, sourcepath, bootclasspath, and/or extdirs setup. Package java/lang could not be found in: /home/bin/antlr-2.7.5.jar /home/streamit-src-2.0/src /home/streamit-src-2.0/3rdparty . make[1]: *** [at/dms/compiler/tools/lexgen/Main.class] Error 1 make[1]: Leaving directory `/home/streamit-src-2.0/src' make: *** [all] Error 2 *** What is this java/lang? kind of a library? how should I add it in? I forget the details, but I believe you need to add JAVA_HOME to your environment, or some similar thing. Point it at the root directory of your java installation. This information may be Sun-specific, but the IBM version should be fairly similar. HTH, Micah ___ vox-tech mailing list vox-tech@lists.lugod.org http://lists.lugod.org/mailman/listinfo/vox-tech
Re: [vox-tech] java
On Fri, Jan 20, 2006 at 05:20:58PM -0800, Matin Hashemi wrote: I set JAVA_HOME env var to $HOME/j2sdk1.4.2_10It didn't solve the problem :-( Okay. Check out http://www.tldp.org/HOWTO/Enterprise-Java-for-Linux-HOWTO-2.html According to this, you should have JAVA_HOME=$HOME/j2sdk1.4.2_10 PATH=$JAVA_HOME/bin:$PATH CLASSPATH=$JAVA_HOME/lib/classes.zip:. Don't forget to export all of these. To make sure they're really accessible to programs you run, look through the output of env. HTH, Micah Cowan ___ vox-tech mailing list vox-tech@lists.lugod.org http://lists.lugod.org/mailman/listinfo/vox-tech
Re: [vox-tech] Funny characters in aterm on kubuntu
On Wed, Jan 11, 2006 at 08:39:13PM -0600, Jay Strauss wrote: Hi all, I'm running Kubuntu breezy. I've installed aterm [EMAIL PROTECTED]:~$ aterm -V aterm version 0.4.2 When I use man or perldoc I get funny characters in the output. Most (99%) of the output is normal but ever so often there is a funny character embedded in the output. It seems like it happens mostly (but not exclusively) at the end of a line. Regular xterm outputs perfectly. Can anyone suggest some things to try to fix this? Sounds like probably an encoding problem. What character set does aterm expect to be using? UTF-8? Most manpages assume ISO-8859-1, I believe. What is the output of ( env | egrep '^LC|LANG' )? -- Micah J. Cowan [EMAIL PROTECTED] ___ vox-tech mailing list vox-tech@lists.lugod.org http://lists.lugod.org/mailman/listinfo/vox-tech
Re: [vox-tech] amazon search in the book questions
On Fri, Jan 06, 2006 at 01:25:22PM -0500, Peter Jay Salzman wrote: Hi all, Consider this URL, which is a page inside a book about Green's functions: http://www.amazon.com/gp/reader/0521282888/ref=sib_rdr_prev2_ex1/104-6467245-0944703?%5Fencoding=UTF8p=S00Hns=1#reader-page When I use the browser (FF) to print the page, the book's contents don't show up on the printed page. Same thing when I use FF's preview print feature. When I use left click view image, the book page's contents disappear too. No matter where I click, the page title is transparent pixel. How exactly does Amazon do this? From what I've seen of how it works, I believe they use JavaScript to swap the image in and out. That might affect why it doesn't print with that; I don't know: however, I don't know how it doesn't show up when you view image. ...Of course, if they're using CSS to achieve layers, then they might be putting the transparent pixel image in /front/ of the real image, meaning that when you right-click on it, you're actually right-clicking on the transparent pixel instead of the one you see. And I think the printing stuff doesn't handle transparency, so that would make some sense, too. Is there a way of saving the book page contents to an image file? The only thing I could think of is taking a window image with GIMP or something like that. That seems simplest. For more, you may have to dig around quite a bit to check out the JavaScript, and any interactions with the server. Probably not worth the hassle. -- Micah J. Cowan [EMAIL PROTECTED] ___ vox-tech mailing list vox-tech@lists.lugod.org http://lists.lugod.org/mailman/listinfo/vox-tech
Re: [vox-tech] gimp no print
On Fri, Jan 06, 2006 at 01:42:38PM -0500, Peter Jay Salzman wrote: Using gimp 2.2 on Debian Etch. The print menu (which I recall being under File) has disappeared. Has this happened to anyone else? You mean, the right-click File menu, right? 'Coz the one on the toolbar doesn't have it. ___ vox-tech mailing list vox-tech@lists.lugod.org http://lists.lugod.org/mailman/listinfo/vox-tech
Re: [vox-tech] gpg-agent issues
On Fri, Dec 16, 2005 at 10:02:00AM -0800, Richard Crawford wrote: I'm trying to get gpg-agent running on my FC3 laptop so that I don't have to type in my passphrase each time I send out an e-mail. Unfortunately, when I try to start gpg-agent with the command: $ gpg-agent I get the following error message: gpg-agent: can't connect to '/home/richard/.gnupg/S.gpg-agent': No such file or directory gpg-agent: no gpg-agent running in this session snip When, for kicks and giggles, I try to execute: $ gpg-agent --daemon I get this error message: can't connect to '/home/richard/.gnupg/log-socket': No such file or directory GPG_AGENT_INFO=/tmp/gpg-4p6U8v/S.gpg-agent:10175:1 export GPG_AGENT_INFO; ...even though there is a file in /home/richard/.gnupg called log-socket. However, that file appears to be empty. Also, when I again execute The error message above looks very fishy indeed: it looks like it's attempting to read in that entire line, starting with GPG_AGENT_INFO and ending with the export command, as the /name/ of a file. Try to find out what is doing that (a miswritten config file somewhere?) You can use the fuser or lsof commands to find all the processes that have a given file open: that could come in handy; as could examining the /proc/pid directory of gpg-agent (run with --daemon), and examining what files it has open. HTH, Micah ___ vox-tech mailing list vox-tech@lists.lugod.org http://lists.lugod.org/mailman/listinfo/vox-tech
Re: [vox-tech] subversion: print non-versioned files in directory
On Thu, Dec 15, 2005 at 10:19:23AM -0800, Matt Roper wrote: Since it's quite common to have a bunch of junk files sitting in your directory that you don't care about (e.g., .o, .c~, etc.), subversion allows you to set a property on a directory that tells it names/patterns of files to ignore. You can do this by running svn propedit svn:ignore . Yeah, but I won'd do that for .o, .c~, etc. Better to set global-ignores in /etc/subversion/config or your ~/.sversionrc. I usually reserve svn:ignore for specific targets, or anything else that I don't block in general but that should be ignored in this specific directory. -Micah ___ vox-tech mailing list vox-tech@lists.lugod.org http://lists.lugod.org/mailman/listinfo/vox-tech
Re: [vox-tech] moving an url gracefully
On Wed, Dec 14, 2005 at 01:52:20PM -0500, Aaron A. King wrote: Forgive my ignorance, but is this something that must be done by reconfiguring the server? Or can one put the 301 redirect into an HTML page sitting at the old site? You can't. There is a non-standard, but de facto standard way to accomplish something very similar in HTML, by using meta http-equiv=Refresh value=0; http://new-url/;, but you wouldn't want to use that unless you really had no control over the server /whatsoever/, even through local configs (.htaccess). There are pretty good reasons not to use that method most of the time; and it also fails to programatically notify indexers or user agents that the new destination replaces the old one (as a 301 does--though I have no idea how smart indexers are about that sort of thing). Apache (and maybe other servers) supports the concept of an .asis document (as-is), which gets served exactly as is, and includes the appropreate HTTP headers _in_the_document_. However, IIRC, Apache doesn't normally have these set up by default, and so if you're able to get that working, you'd probably be able to get the mod_rewrite stuff working as well (which is a generally better approach). -- HTH, Micah J. Cowan [EMAIL PROTECTED] ___ vox-tech mailing list vox-tech@lists.lugod.org http://lists.lugod.org/mailman/listinfo/vox-tech
Re: [vox-tech] Kmail Question
On Mon, Nov 14, 2005 at 11:38:03PM -0600, Ken Bloom wrote: I've tried Thunderbird, Balsa (from GNOME) and Sylpheed-Claws. My biggest problem with Balsa and Sylpheed-Claws are the GTK+ click-and-paste wierdness. When you select text that becomes the text that's pasted when you middle-click. When you deselect that text, the previous contents of the paste buffer are restored (which doesn't feel like the correct behavior at all). Did you know that GTK+ also typically supports Ctrl-C, Ctrl-V, with a separate (internal--not X) copy buffer? Also, deselecting via an arrow key, or possibly via Ctrl-Shift-A, will not alter the copy buffer. ___ vox-tech mailing list vox-tech@lists.lugod.org http://lists.lugod.org/mailman/listinfo/vox-tech
Re: [vox-tech] Kmail Question
On Tue, Nov 15, 2005 at 11:19:23AM -0800, Jeffrey J. Nonken wrote: On Mon, 14 Nov 2005 23:38:03 -0600 Ken Bloom [EMAIL PROTECTED] wrote: My biggest problem with Thunderbird (and Firefox) are MIME associations. I get the impression that there's some combination of behavior where Thunderbird and Firefox don't remember them, don't share them with each other, and don't share them with any other standard system of MIME associations. Likewise for protocol helpers. We really need a better way to tie these apps together. I've tried Firefox on my Windoze machine, and while it's a decent little browser, I never liked it as well as I like Mozilla. Thing about Mozilla is that it's got the news/email and browser in the same package. I don't know if it addresses your plaint, but I'd expect it to be better integrated. Might be worth looking into. I might be wrong, but I think Ken was talking about integration with /other/, non-Mozilla applications that use MIME associations. -- Micah J. Cowan [EMAIL PROTECTED] ___ vox-tech mailing list vox-tech@lists.lugod.org http://lists.lugod.org/mailman/listinfo/vox-tech
Re: [vox-tech] Kmail Question
On Sun, Nov 13, 2005 at 01:26:21AM -0800, Richard Harke wrote: On Sun November 13 2005 00:55, Richard Harke wrote: Kmail normally expects its mail directory to be the users home directory/Mail Is there some way to set to something else? I want to use it with a jump drive under Knoppix. Well, duh! Just use a soft link. Should have googled first. Richard Still not very flexible, if you ask me. I recently gave up on KMail after numerous issues with it; primarily that sometimes it would just... stop working. Actually, I have yet to find a GUI email client for Linux that I like. But I need to use them for HTML-based emails that I receive at work. :-( -Micah ___ vox-tech mailing list vox-tech@lists.lugod.org http://lists.lugod.org/mailman/listinfo/vox-tech
Re: [vox-tech] Kmail Question
On Mon, Nov 14, 2005 at 03:32:47PM -0600, Jay Strauss wrote: You should try Thunderbird. It kinda sucks too :) It's what I've switched back to. It has its problems, but it's my favorite thus far. -Micah ___ vox-tech mailing list vox-tech@lists.lugod.org http://lists.lugod.org/mailman/listinfo/vox-tech
Re: [vox-tech] [OT] IE fails on my page: error 80004004
On Mon, Oct 03, 2005 at 03:02:10PM -0700, Richard Crawford wrote: I spent my morning developing my personal homepage, http://www.mossroot.com, using Quanta+ on my Linux computer and checking it in Firefox. When I finally got around to trying it out with IE, IE refused to finish loading the page. When I tried IE under WINE, I was told it got an error number 80004004. I've Googled on that error number but I haven't found anything that seems relevant. I'm stumped. Anyone got any ideas? Everything seems okay. I notice Connection: Keep-Alive is set by default, and wonder if that has anything to do with it (although I was pretty sure IE honors that correctly). Have you tried using tcpdump? Maybe do tcpdump -vv -s 0 -X port 80 (as root) while connecting to your server with IE, and maybe we can figure out what's going on... you might not want to post that full log to the list, since it might be somewhat lengthy: perhaps post a URI to it... What version of IE are you using? -Micah ___ vox-tech mailing list vox-tech@lists.lugod.org http://lists.lugod.org/mailman/listinfo/vox-tech
Re: [vox-tech] RESOLVED [OT] IE fails on my page: error 80004004
On Mon, Oct 03, 2005 at 05:44:09PM -0700, Richard Crawford wrote: Apparently, moving the JavaScript function that creates the menu outside of the nested div tags fixed the problem. Weird. Okay, cool. Cause I was about to say I couldn't find anything obviously wrong with the transfers. -Micah ___ vox-tech mailing list vox-tech@lists.lugod.org http://lists.lugod.org/mailman/listinfo/vox-tech
Re: [vox-tech] Printing PNG's
On Fri, Sep 23, 2005 at 03:00:52PM -0700, Richard Harke wrote: I started to save some documents by scanning them into my computer and saving them as PNG files. I have been viewing them with Kview which has worked well until I wanted to print one. On screen, i can set the scaling to 33% and I get a good size to work with with just a little bit of scrolling. If I then print, the size goes back to 100% so that only a small part of the upper left corner is actually printed. I have tried using the preview print function and changing the scale there but that doesn't help. The best I got was with Firefox but then it was scaled down so that a page image was on about half the page. Everything was there but hard to read. What about GIMP? I find its Printing set-up to be quite useful. ___ vox-tech mailing list vox-tech@lists.lugod.org http://lists.lugod.org/mailman/listinfo/vox-tech
Re: [vox-tech] [OT] Binary Representation Challenge
On Tue, Sep 20, 2005 at 12:02:26PM -0700, Alex Mandel wrote: I realize this might be not be a challenge for some of you. -- I need to make a list of all possible permutations given 9 options and that you can choose any number of options at once. I've figured out using nCr statistics that this is 511 choices, but now I need to represent them in 2^9 binary code: 1, 00010 etc Anyone got a quick way? I thought about writing a python code or something but then I got confused just thinking about the algorthim. Now the best would be if you had an idea that I could implement with my limited toolset: R, OpenOffice, Python, and I guess I could add a package to Cygwin if necessary. Perhaps its simpler than you think? If all you need is the different permutations of two-choice options, all of which can be selected in any combination, then this is exactly the same as counting in binary. Or is it actually printing the representation of the binary that is posing a problem? FWIW, Knuth has recently published a couple of fascicles from Volume IV of TAOCP; both of them dealing with Generating all Tuples and Permutations. I was stumped by how much there is to know about such a seemingly simple subject. -Micah ___ vox-tech mailing list vox-tech@lists.lugod.org http://lists.lugod.org/mailman/listinfo/vox-tech
Re: [vox-tech] [OT] Binary Representation Challenge
On Tue, Sep 20, 2005 at 12:23:13PM -0700, Alex Mandel wrote: Micah J. Cowan wrote: On Tue, Sep 20, 2005 at 12:02:26PM -0700, Alex Mandel wrote: I realize this might be not be a challenge for some of you. -- I need to make a list of all possible permutations given 9 options and that you can choose any number of options at once. I've figured out using nCr statistics that this is 511 choices, but now I need to represent them in 2^9 binary code: 1, 00010 etc Anyone got a quick way? I thought about writing a python code or something but then I got confused just thinking about the algorthim. Now the best would be if you had an idea that I could implement with my limited toolset: R, OpenOffice, Python, and I guess I could add a package to Cygwin if necessary. If all you need is the different permutations of two-choice options, all of which can be selected in any combination, then this is exactly the same as counting in binary. Or is it actually printing the representation of the binary that is posing a problem? Correct, I need to print a list to represent the choices. It's going to be a lookup table in a database on the backside of a webpage that pulls up a static map of the options picked. Well; so perhaps you could have a nine-element array of strings naming the options, and iteratively test each bit on each counting iteration, printing out the string at the same index as the bit you are testing, followed by = yes or = no, depending on your needs? ___ vox-tech mailing list vox-tech@lists.lugod.org http://lists.lugod.org/mailman/listinfo/vox-tech
Re: [vox-tech] [OT] Binary Representation Challenge
On Tue, Sep 20, 2005 at 01:31:02PM -0700, Alex Mandel wrote: I get what your saying, lets just say I'm not that experienced at using arrays. On an interesting note though, we figured out how to overlay tranparent gifs(by layering DIV tags) so we only need 10 images instead of 512 and now just have to write a short script to build the html dynamically instead of a lookup table. Hm, okay. I guess I'm not really clear on what your needs are, then: it wasn't clear to me that this was for a web site or anything like that, and I'm not sure why there is a need to layer transparent gifs. What sort of image are you trying to generate? Be careful with layering images: Mozilla and MSIE treat absolute positioning /very/ differently (MSIE's is broken, naturally). HTH, Micah ___ vox-tech mailing list vox-tech@lists.lugod.org http://lists.lugod.org/mailman/listinfo/vox-tech
Re: [vox-tech] Empty sendmail log files
On Wed, Aug 31, 2005 at 06:05:50PM -0700, Chris Scheuble wrote: How do I empty the sendmail log files? Hi Chris, I'm not certain I know what you're asking: you can clear the mail log files easily enough by doing something like: $ /var/log/maillog or whatever the log name is (note the preceding ). If this isn't what you meant, please give me a call at 408-247-8403. During work hours, I'm at 408-342-5379 (new job). -- Micah J. Cowan [EMAIL PROTECTED] ___ vox-tech mailing list vox-tech@lists.lugod.org http://lists.lugod.org/mailman/listinfo/vox-tech
Attn Admin [Re: [vox-tech] Empty sendmail log files]
On Wed, Aug 31, 2005 at 06:35:36PM -0700, Micah J. Cowan wrote: If this isn't what you meant, please give me a call at [...] Er, /oops/... Chris is a friend of mine, and I didn't realize he was posting from vox-tech... could the mail admin please appropriately remove my personal info from the archive? Thanks. ___ vox-tech mailing list vox-tech@lists.lugod.org http://lists.lugod.org/mailman/listinfo/vox-tech
Re: [vox-tech] sshd_config and PasswordAuthentication
On Fri, Jul 22, 2005 at 12:02:41PM -0700, Karsten M. Self wrote: on Fri, Jul 22, 2005 at 10:01:32AM -0500, Jay Strauss ([EMAIL PROTECTED]) wrote: No. The authentication is handled by SSH using the public/private keypair. The system password itself isn't involved in the authentication at all. It's possible to have users whose remote passwords are unknown or disabled by this method. This is the case for a number of remote hosts I access regularly. Peace. Karsten, I apologize, I didn't realize I hadn't responded. Thanks for all the info. I think you are talking about passwordless authentication, It's not passwordless, which is a description of negation. It is possible to set up accounts and SSH-keys without passwords or passphrases. Naturally, this is highly insecure. A small quibble: Using assymetric key cryptography without passphrases is not necessarily insecure. If the private key is secure, then a passphrase is not useful. A private key is not really harder to secure than a passphrase is, and if the private key is accessible to someone, chances are pretty good that the passphrase can be as well. Also, use of a passphrase-encryption on a more-or-less publicly available private key means that the weakest link in the security chain will be the weaker of (1) the assymetric encryption algorithm and (2) the symmetric encryption algorithm used to encrypt the private key with the passphrase. Of course, if the private key is truly private, then the passphrase does no harm (other than the minor nuisance it presents to the owner), and provides an extra level of protection in the case of *accidental* compromise of the private key, for the paranoid (a generally good trait to possess). Nonetheless, it seems to me that calling the use of public-key cryptography without passphrases highly insecure is a rather harsh exaggeration. ___ vox-tech mailing list vox-tech@lists.lugod.org http://lists.lugod.org/mailman/listinfo/vox-tech
Re: [vox-tech] sshd_config and PasswordAuthentication
On Fri, Jul 08, 2005 at 10:23:28AM -0500, Jay Strauss wrote: What's wrong with PasswordAuthentication in a nutshell is, in order to authenticate yourself, both you and the destination host know your password. But, even if I have this set to no, and I do an interactive login, then both me and the remote box need to know my password. public/private keys avoid the above issue. True enough--although I did not realize before this thread that setting PasswordAuthentication no still allows password authentication. Anyway, in my quote above, s/PasswordAuthentication/password authentication/, and it should be correct. But I dont' see how setting PasswordAuthentication yes accomplishes the above. Obviously I'm missing something. I'm going to go reread the thread -- Micah J. Cowan [EMAIL PROTECTED] ___ vox-tech mailing list vox-tech@lists.lugod.org http://lists.lugod.org/mailman/listinfo/vox-tech
Re: [vox-tech] Matching Contents of Lists
On Fri, Jul 08, 2005 at 10:28:00AM -0500, Jay Strauss wrote: Micah J. Cowan wrote: snip First, you will need to create a comparison function, that will return an integer less than, greater than, or equal to zero depending on whether its first argument compares lexically less than, greater than, or equal to its second argument. This function should match based on your rules given above, and is meant as an analog for the cmp and = operators. snip Won't this just match identical records, and not account for his matching rules? Seems like this is just a programmatic SQL join (Read the above paragraph). -- Micah J. Cowan [EMAIL PROTECTED] ___ vox-tech mailing list vox-tech@lists.lugod.org http://lists.lugod.org/mailman/listinfo/vox-tech
Re: [vox-tech] Matching Contents of Lists
On Fri, Jul 08, 2005 at 01:52:38PM -0500, Jay Strauss wrote:
sub parse {
my $str = $_[0];
# Capture the parts, leading alpha, followed by n digits,
# followed optionally by alphas
$str =~ /([a-zA-Z]+)(\d+)([a-zA-Z]+)?/;
my @str = ($1,$2,$3); # put the matches back into an array
Of course, this could have been:
my (@str) = $str =~ /([a-zA-Z]+)(\d+)([a-zA-Z]+)?/;
eliminating the need to refer specifically to the positional variables.
$str[1] =~ s/^0+//; # strip leading 0s from digit portion
Personally, I typically use $str[1] += 0, but obviously that's a style
thing.
return @str;
}
--
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Re: [vox-tech] Matching Contents of Lists
On Fri, Jul 08, 2005 at 03:53:00PM -0500, Jay Strauss wrote: Micah J. Cowan wrote: On Fri, Jul 08, 2005 at 10:28:00AM -0500, Jay Strauss wrote: Micah J. Cowan wrote: snip First, you will need to create a comparison function, that will return an integer less than, greater than, or equal to zero depending on whether its first argument compares lexically less than, greater than, or equal to its second argument. This function should match based on your rules given above, and is meant as an analog for the cmp and = operators. snip Won't this just match identical records, and not account for his matching rules? Seems like this is just a programmatic SQL join (Read the above paragraph). I didn't really know what you meant by lexically. I thought you might be saying: return -1 if $a lt $b; return 0 if $a eq $b; return 1 if $a gt $b; Well, and that's more or less what lexically would mean, if I hadn't qualified it with [matching] based on your rules above. But there wouldn't be much point to rolling your own function otherwise, when cmp works just fine ;-) But I now understand, you want to build sophisticated comparison, maybe even character by character, to determine -1,0,1. Seems hard, but you've probably already boiled it down to a one-liner :) No need for character by character comparison: in fact your regex-based parsing would be fine. Just build the parsed string for each one, and then do a cmp on that. -- Micah J. Cowan [EMAIL PROTECTED] ___ vox-tech mailing list vox-tech@lists.lugod.org http://lists.lugod.org/mailman/listinfo/vox-tech
Re: [vox-tech] sshd_config and PasswordAuthentication
On Thu, Jul 07, 2005 at 10:57:53AM -0500, Jay Strauss wrote: No, SSH never passes password across the net in cleartext. They are sent to the remote host when using this option, which means that unless you have a different password for each host, a malicious remote administrator could capture your password and then use if to compromise your other accounts. Feeling a bit stupid but I still don't understand what you mean If I ssh from A to sveasoft - the password is encrypted If I then ssh from sveasoft to C - the password is cleartext? No. The ssh password is always tunneled, but it's tunnelled cleartext. This means that a sysadmin at sveasoft could rig their sshd to capture the cleartext password to a file, and they could then use it at other sites where you use the same password. Note that before you ssh'd in, they don't have your password unencrypted: they have a password hash. -- Micah J. Cowan [EMAIL PROTECTED] ___ vox-tech mailing list vox-tech@lists.lugod.org http://lists.lugod.org/mailman/listinfo/vox-tech
Re: [vox-tech] sshd_config and PasswordAuthentication
On Thu, Jul 07, 2005 at 03:53:46PM -0500, Jay Strauss wrote: Micah J. Cowan wrote: On Thu, Jul 07, 2005 at 10:57:53AM -0500, Jay Strauss wrote: No, SSH never passes password across the net in cleartext. They are sent to the remote host when using this option, which means that unless you have a different password for each host, a malicious remote administrator could capture your password and then use if to compromise your other accounts. Feeling a bit stupid but I still don't understand what you mean If I ssh from A to sveasoft - the password is encrypted If I then ssh from sveasoft to C - the password is cleartext? No. The ssh password is always tunneled, but it's tunnelled cleartext. This means that a sysadmin at sveasoft could rig their sshd to capture the cleartext password to a file, and they could then use it at other sites where you use the same password. Note that before you ssh'd in, they don't have your password unencrypted: they have a password hash. I feel I'm going a little round and round here Please correct me if I'm wrong, but I think you saying simply is that the data that comes out of the far side of the tunnel is clear text? That's right. It's not clear while it's in the tunnel. ie: me --ssh/encrypted -- sveasoft -- tunnel/cleartext -- box C I think that's right, although I'm not sure I entirely understand what I'm seeing above... ssh/encrypted and tunnel/cleartext are the same thing, unless the first one is intended to represent assymetric (public/private) key encryption. Assuming that you're not using assymetric key encryption at any point, the password is cleartext at every terminating point in the above (me, sveasoft and box C), but at no point in between. BTW, sveasoft is just my own linksys router (at home) running a different firmware, you could substitute any linux box in for the sveasoft But if I ssh to a box that has PasswordAuthentication yes, but then just do vi and other admin tasks, nothing is clear text between the 2 computers, including (most importantly) my password. The tunneling bit I'm not too worried about. No, it's clear text at the destination box, in terms of the sysadmin (who could potentially read sshd's memory to see what it decrypted, and hence the decrypted clear-text password), and in terms of the sshd owner (who may have modified sshd to capture the password after decrypting it). Furthermore if I, from the ssh session into my router, in turn ssh to another box, everything from box router - c is encrypted, right? Everything on an ssh connection from any box to any other box is encrypted. It's the termination points that are the problem (keylogging/ssh-prog capturing at origin, capturing or sysadmin-snooping at destination). The reason why public key cryptography is preferred, is that you prove to the destination box that you are who you say you are, without allowing the destination box to turn around and prove that /it/ is who /you/ say you are. What's wrong with PasswordAuthentication in a nutshell is, in order to authenticate yourself, both you and the destination host know your password. ___ vox-tech mailing list vox-tech@lists.lugod.org http://lists.lugod.org/mailman/listinfo/vox-tech
Re: [vox-tech] Matching Contents of Lists
On Wed, Jul 06, 2005 at 03:08:38PM -0700, Lango, Trevor M. wrote:
I have two lists, not necessarily of the same length. List #1 has two
columns. List #2 has one column. I would like to do the following:
Scan list #1 line by line. If a match for column #1 in list #1 is found
in list #2, extract the matching lines and put them in a new list (#3).
Otherwise, leave the contents of lists #1 and #2 as they are.
If I expected the contents of the first column of each list to match
exactly (character for character) - this would be a simple task with C++
or the like. However, the contents will not necessarily be perfectly
identical. I do believe they are nearly identical enough though to use
pattern matching via Perl or the like. Personally this is difficult for
me (as a Perl noob), I know how to scan through a file for a
pre-determined pattern - I don't understand how to scan through a file
for a pattern that is essentially given by a line in another file...? I
have not found anything in my reading of Perl documentation that
explains how to read a file and use its contents as an argument for the
pattern to search for in another file (suggestions on excellent Perl doc
sources appreciated also!).
Perl allows you to build up a regex pattern in a scalar, and then use
that scalar to match against a string. For instance:
@words = qw( foo bar );
$pattern = join('|', @words);
$line =~ $pattern; # Does $line match 'foo|bar'?
I'm not sure if this is actually the most useful mechanism for what you
want, though.
This is what the contents of the lists may look like:
TALL0047A
TAL0047A
TAL047A
TAL47A
TA0047A
TA047A
TA47A
T0047A
T047A
T47A
T0047
T047
T47
Examples of matching:
TALL0047ATALL047Amatch
TALL0047ATAL0047A not a match
TALL0047ATAL0470A not a match
The contents will always be one to four alpha characters followed by one
to four numeric characters possibly followed by one or two alpha
characters.
A match would be defined as the following criteria being met:
- The last one to four digits being identical (excluding leading zeroes)
- The first one to four letters being identical
It is not entirely clear to me what role the final 'A' character has in
determining a match. However, I would recommend the following alogirthm.
First, you will need to create a comparison function, that will return
an integer less than, greater than, or equal to zero depending on
whether its first argument compares lexically less than, greater than,
or equal to its second argument. This function should match based on
your rules given above, and is meant as an analog for the cmp and =
operators.
Next, sort both lists. Start with an index into the first element of
list 1 ($i), and an index into the first element of list 2 ($j).
If $list_one[$i] compares equal to $list_two[$j], you have your match:
remove that element from both lists, and append it to the new one.
If $list_one[$i] compares less than $list_two[$j], then advance $i and
compare again.
If $list_one[$i] compares greater than $list_two[$j], then advance $j
and compare again.
If either $i or $j falls off the end, you are done. This algorithm
has linear complexity-- O(N), where N is the number of elements in the
longer of the two lists. Not counting the complexity involved for
whatever sort algorithm you use. If you use Perl's sort function, you'll
get linearithmic time (N log N).
Test the hell outta your code before relying upon it. :-)
HTH,
Micah
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Re: [vox-tech] I'm out of space on /
On Thu, Jun 30, 2005 at 12:53:15AM -0700, Rick Moen wrote: Quoting Troy Arnold ([EMAIL PROTECTED]): I understand the reasoning behind all your boot options except the noatime on /var/* and /tmp. What's the scoop on that ? Small speed advantage. Fewer timestamp updates means faster access. (Don't forget that atime has to get updated if you merely ls a directory.) Well, yeah: but only of the directory, yes? (Brief experimentation seems to confirm this.) Seems like an incredibly small advantage. -Micah ___ vox-tech mailing list vox-tech@lists.lugod.org http://lists.lugod.org/mailman/listinfo/vox-tech
Re: [vox-tech] I'm out of space on /
On Thu, Jun 30, 2005 at 12:12:36PM -0700, Rick Moen wrote: Quoting Micah J. Cowan ([EMAIL PROTECTED]): [noatime on some filesystems:] Well, yeah: but only of the directory, yes? And subdirectories thereof, if/when they are stat'ed. (Brief experimentation seems to confirm this.) Seems like an incredibly small advantage. shrug It cost me all of seven one-time keystrokes per filesystem. Heh. Excellent point! -- Micah J. Cowan [EMAIL PROTECTED] ___ vox-tech mailing list vox-tech@lists.lugod.org http://lists.lugod.org/mailman/listinfo/vox-tech
Re: [vox-tech] [fwd] backup solutions for 3 people
On Wed, Jun 29, 2005 at 08:35:21AM -0700, Jonathan Stickel wrote: Karsten M. Self wrote: Tape. I've never really used tape drives, but my one experience was not good. Someone else backed up data to a tape on a mid 90s unix machine, I think. I needed the data about a year ago. We were unable to access the data because we were clueless about how the tape was formatted, what software utility wrote to the tape, etc. The computer that wrote to the tape was long gone. From this experience, it seemed that there is no standard when it comes to tape formatting, reading, and writing. Has this changed? If not, they don't seem that useful to me. I have no experience with tape either, but I thought that's what tar ar were for? AFAIK, no actual filesystem would be practical, so probably a tape's content consists of nothing more than a tar file. Someone who actually knows something can point out any idiocy in what I just said. :-) -- Micah J. Cowan [EMAIL PROTECTED] ___ vox-tech mailing list vox-tech@lists.lugod.org http://lists.lugod.org/mailman/listinfo/vox-tech
Re: [vox-tech] ..'xxx is not an ELF file' errors
On Tue, May 24, 2005 at 01:04:31AM -0700, Dylan Beaudette wrote:
after manually re-installing about 30 packages until no errors were
returned from apt the system *appears* to be fine... however, just for
fun i tried to make a PDF from a latex file... it works without errors,
but there is something terribly wrong with the fonts ... now i am
beginning to think that a re-install of the entire system might be the
only way to get a functioning computer back...
How are you generating the PDF? There are a number of known problems
with MetaFonts that become converted to high-resolution bitmapped
Type 3 fonts. I usually use pdftex/pdflatex, which does a tremendous
job. If you are generating DVIs first and then converting to PDF, there
may be a bit more work. In any case, you must have the Type 1 versions of
the standard MetaFont fonts. Google for more info.
Alternatively, you could \usepackage{times} or \usepackage{psfonts},
which uses the standard PostScript fonts instead of Computer Modern et
al.
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Re: [vox-tech] emacs formatting
On Fri, May 13, 2005 at 01:19:07PM -0400, Peter Jay Salzman wrote:
but in some situations emacs formats code like this:
if(foo)
{
doSomething();
}
*barf*!!!
This is the official GNU indentation style. It does have some nice things about
it... but lately I tend to use KR style.
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Re: [vox-tech] emacs formatting
On Fri, May 13, 2005 at 11:27:21AM -0700, Jonathan Stickel wrote: Charles McLaughlin wrote: Hello, I am hoping someone can point me in the write direction. I want to change how emacs formats code. I'm very picky about spacing and brackets. If I have to make the change for every mode that is fine, but I'd prefer to make the change once and have it apply to all types of code I use. The modes I'm mainly concerned about now are C/C++, PHP and Perl. I'm an amateur when it comes to emacs hacks, but I suspect you'll need to add appropriate lines for each mode to your ~/.emacs file. Probably cut and paste will do much of it, though. Actually, it's much, much more elegant than that. Hit M-x customize (press ENTER). Go to the Programming group, then to Languages, and then C. You should find everything you need in there. You can pretty much customize everything. When you hit the Save for Future Sessions button, it will automatically adjust your .emacs file appropriately and safely. -Micah ___ vox-tech mailing list vox-tech@lists.lugod.org http://lists.lugod.org/mailman/listinfo/vox-tech
Re: [vox-tech] simple file command question
On Wed, May 04, 2005 at 01:57:24PM -0400, Mike Simons wrote: On Wed, May 04, 2005 at 10:45:30AM -0700, Ehrhart, Jay wrote: how do you use ll or ls to show the year the file was created? ls -l --full-time Er, hm? This just prints the last time the file was written, in ISO format. -- Micah J. Cowan [EMAIL PROTECTED] ___ vox-tech mailing list vox-tech@lists.lugod.org http://lists.lugod.org/mailman/listinfo/vox-tech
Re: [vox-tech] C99 - Initializing complex
On Mon, Sep 06, 2004 at 06:12:47PM -0400, Peter Jay Salzman wrote: Must both parts of a complex variable be initialized: long double complex z = 0.0L + 0.0L*I; (i) or does only one part need to be initialized? long double complex z = 0.0L;(ii) A test program shows that (ii) works, but I couldn't find an authoritative answer in the C99 standard. Although I have no intention of using anything but Linux, I still don't want to rely on GNU extensions (as much as possible). The following paragraph winds a bit, but the most important bit is the final sentence. 6.7.8#11 says that the same type constraints and conversions as for simple assignment apply In 6.5.16.1#1 (Simple Assignment: Constraints), the applicable constraint that your (ii) fulfills is that both operands must be arithmetic type (so now so far we are guaranteed at least that a diagnostic has not been required). 6.7.8#11 states that the initial value of the declared object will be the value of the initializer, after conversion; and 6.3.1.7#1 states that the value of a complex object converted from a real is such that its real part has the (converted) value of the real from which it was converted, and the imaginary part is zero. BTW, my copy of the C99 standard is from August 3, 1998 and appears to be a pre-release. I'm a little surprised that a Google search for C99 standard just doesn't give a copy of the standard the way a Google search for US Constitution yields the Constitution. Where is the official copy of this standard? webstore.ansi.org has it (ANSI being a member of the ISO). C99 is a nickname: the language is still The C Programming Language: the official designation is ISO/IEC 9899:1999. -- Micah J. Cowan [EMAIL PROTECTED] ___ vox-tech mailing list [EMAIL PROTECTED] http://lists.lugod.org/mailman/listinfo/vox-tech
