Re: Bug in xterm?
- Forwarded message from Andy Farkas [EMAIL PROTECTED] - -- $ perl -mDigest::MD5 -e 'print pack(H*,Digest::MD5::md5(test))' ert $ wc ert 0 1 8 ert $ hexdump -C ert 9f 4d f1 3c ae 73 67 46 |.M..sgF| 0008 $ cat ert At this point it hangs; sending ^Q doesn't help. But if you press cursor-up a few times it comes back to life. ... Oddly, a real vt220 would do the same thing, but neither has any use for the content of the string. A real VT220 does NOT hang. It prints Mn?sgF (the n has a ~ on top, and the ? is backwards). I get a prompt back straight away, and everything stays normal. -andyf (you may post this to the list) - End forwarded message - ___ [EMAIL PROTECTED] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-stable To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: Bug in xterm?
On Sat, Nov 27, 2004 at 11:52:15AM +1100, Edwin Groothuis wrote: [~] [EMAIL PROTECTED]perl -mDigest::MD5 -e 'print pack(H*,Digest::MD5::md5(test))' | hexdump -C 9f 4d f1 3c ae 73 67 46 |.M..sgF| This shows that it outputs some high-ascii data, which causes the xterm to stop output. If you do echo hi /tmp/aaa while in this state (be alert for typos), you see that it still accepts commands, but doesn't show them anymore. Thanks. I got a nice analysis off-list: -- $ perl -mDigest::MD5 -e 'print pack(H*,Digest::MD5::md5(test))' ert $ wc ert 0 1 8 ert $ hexdump -C ert 9f 4d f1 3c ae 73 67 46 |.M..sgF| 0008 $ cat ert At this point it hangs; sending ^Q doesn't help. But if you press cursor-up a few times it comes back to life. It must be a strange escape sequence if typing characters and hitting Return lots of times is not enough to bring it back to life. I suppose it's technically not an escape sequence, since it doesn't include 0x1B :-) 0x9f is APC - which begins a string. Technically it's only terminated by a ST (0x9c or ESC followed by backslash), but xterm also accepts a BEL, which may be what's emitted when you do a few uparrows (getting an error response from the shell). There's also a resource setting to work around some Linux junk (hardcoded applications with malformed sequences) that can make it terminate on a carriage return. But generally, it would look as if it's hung. (A soft-reset would fix the problem with less damage to your session). Oddly, a real vt220 would do the same thing, but neither has any use for the content of the string. -- I guess I wasn't expecting any escape sequence which consumed an infinite number of characters - and presumably also, Konsole implements a different terminal emulation (or implements vt220 wrongly). Cheers, Brian. ___ [EMAIL PROTECTED] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-stable To unsubscribe, send any mail to [EMAIL PROTECTED]
Bug in xterm?
I can cause xterm to hang reliably with the following command: perl -mDigest::MD5 -e 'print pack(H*,Digest::MD5::md5(test))' A control-middlebutton-Do Full Reset is needed to get out of this state. Konsole doesn't have this problem (but Konsole takes too much screen real-estate). Anyway, just thought it was worth a mention... Regards, Brian. ___ [EMAIL PROTECTED] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-stable To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: Bug in xterm?
On Fri, Nov 26, 2004 at 02:07:51PM +, Brian Candler wrote: I can cause xterm to hang reliably with the following command: perl -mDigest::MD5 -e 'print pack(H*,Digest::MD5::md5(test))' A control-middlebutton-Do Full Reset is needed to get out of this state. It's not a bug in xterm on itself. If you cat a binary file you might end up in the same situation. [~] [EMAIL PROTECTED]perl -mDigest::MD5 -e 'print pack(H*,Digest::MD5::md5(test))' | hexdump -C 9f 4d f1 3c ae 73 67 46 |.M..sgF| This shows that it outputs some high-ascii data, which causes the xterm to stop output. If you do echo hi /tmp/aaa while in this state (be alert for typos), you see that it still accepts commands, but doesn't show them anymore. In other words, don't worry too much about it but make sure you redirect binary output to files or pipes and not the console. Edwin -- Edwin Groothuis |Personal website: http://www.mavetju.org [EMAIL PROTECTED]| Weblog: http://weblog.barnet.com.au/edwin/ ___ [EMAIL PROTECTED] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-stable To unsubscribe, send any mail to [EMAIL PROTECTED]
