Re: Line-oriented socket I/O using select()
On Jan 13, 2013, at 8:35 PM, Charles DeRykus dery...@gmail.com wrote: On Sun, Jan 13, 2013 at 3:03 PM, Vic Sage vic.s...@icloud.com wrote: What I *want* is to block until an entire \n-terminated string [can that be referred to as a line?] can be retrieved from one of my clients. I'm sure I could work out the logic to maintain application-level buffers, but I suspect I would merely be reinventing the wheel, one bug at a time :-). What does the experienced Perl programmer - or socket-level programmer in general - do in this situation? I'm not experienced in heavy duty socket-level programming but you may want to invest in learning POE: https://poe.perl.org It's already refined many of the wheels you'll need and appears well documented. Wow - that is one substantial package! POE looks like a pretty steep learning curve; however, it appears as if POE::Wheel::ReadWrite might be what is needed. I've never tried my hand at working with event loops - and I'd be interested to hear if there's a general consensus that this is much preferable to my old-school approach of just looping on a select().
Line-oriented socket I/O using select()
I'm writing a multiplexed TCP-based server that reads \n-terminated strings from clients and does something with them. Since this is one process with multiple client connections, it uses select() (or, actually, can_read from IO::Select) to block until data has arrived from any client. It's my understanding that TCP does not preserve message boundaries. That is, if a client writes: $sock-autoflush(1); print $sock abel\n; print $sock baker\n; print $sock charlie\n; ... there are no guarantees about what will be returned from the server's system buffer by sysread() when select() pops. It could be a, or abel\n, or abel\nbak, etc. What I *want* is to block until an entire \n-terminated string [can that be referred to as a line?] can be retrieved from one of my clients. I'm sure I could work out the logic to maintain application-level buffers, but I suspect I would merely be reinventing the wheel, one bug at a time :-). What does the experienced Perl programmer - or socket-level programmer in general - do in this situation? VS -- To unsubscribe, e-mail: beginners-unsubscr...@perl.org For additional commands, e-mail: beginners-h...@perl.org http://learn.perl.org/
Re: Recommendations for emacs customizations for editing Perl
On Sep 11, 2012, at 11:45 PM, Shlomi Fish shlo...@shlomifish.org wrote: Hi pangj, On Wed, 12 Sep 2012 12:28:54 +0800 pangj pa...@riseup.net wrote: Have been coding perl with VIM always. Good for you, but the original question was about Emacs and it is a legitimate question. I had no idea how popular Vi/Vim was until I recently joined this company. Emacs wasn't even installed! I made a mighty effort to switch to Vim after 18 years of using Emacs, but after two months I was still making the same mistakes - the zen of Vi[m] just never really dawned. (It once took me six weeks of programming in C, cursing it the whole way, to realize what a waste the previous 14 years of coding assembler had been. Same for switching to Unix from MVS. I figure two months is enough to unlearn just about anything.) But, yes, as Shlomi points out, I *am* looking for suggestions from experienced Perl programmers who use - and customize - Emacs :-) V -- To unsubscribe, e-mail: beginners-unsubscr...@perl.org For additional commands, e-mail: beginners-h...@perl.org http://learn.perl.org/
Re: Recommendations for emacs customizations for editing Perl
On Sep 12, 2012, at 5:59 AM, Paul Anderson wackyvor...@me.com wrote: Install PDE from CPAN and it'll work alright. It works fine for me on 5.16.1. So it does. I was concerned that PDE hadn't been updated in four years. But I gather it works well with all the recent syntax? V -- To unsubscribe, e-mail: beginners-unsubscr...@perl.org For additional commands, e-mail: beginners-h...@perl.org http://learn.perl.org/
Recommendations for emacs customizations for editing Perl
I'd like to hear some recommendations from this list for customizations to emacs for coding Perl.One seemingly respected site,http://emacswiki.org/emacs/PerlLanguage, has a lot of links but unfortunately some are pretty dated. For example, the Perl Develop Environment,http://search.cpan.org/dist/Emacs-PDE/, last updated in 2008, wouldn't install because my version of Perl (5.16.1) was "too far out of date." So of course the question is, how up-to-date is emacswiki.org?As I say, I'm running Perl 5.16.1, and emacs 24.something. I do have cperl-mode.el, but there are also a lot of goodies out there like variable-name completion and templates that look very useful. I mostly don't want to be installing and troubleshooting stuff that hasn't been updated in five years and/or isn't "generally regarded" to be top quality.Thanks for any pointers or even advice about what to avoid :)Vic
Re: Recommendations for emacs customizations for editing Perl
On Sep 11, 2012, at 10:24 PM, John SJ Anderson geneh...@genehack.org wrote: Well, there's the 'Tweakers Anonymous' talk I gave at YAPC… * slides: http://www.slideshare.net/genehackdotorg/tweakers-anonymous-13313552 * video: http://www.youtube.com/watch?v=A3_lY-zlzik Okay - good points to keep in mind. There's also my Emacs config: https://github.com/genehack/emacs (the Perl stuff is mostly in etc/perl.el) Okay, this looks good but I don't know how to install it. I have a .emacs file and a .emacs.d directory in my home directory; you have an init.el file and bin, etc, and share directories. Can you give me the idiot's guide? :) V -- To unsubscribe, e-mail: beginners-unsubscr...@perl.org For additional commands, e-mail: beginners-h...@perl.org http://learn.perl.org/
