Configuration Information [Automatically generated, do not change]:
Machine: i686
OS: linux-gnu
Compiler: i686-pc-linux-gnu-gcc
Compilation CFLAGS: -DPROGRAM='bash' -DCONF_HOSTTYPE='i686'
-DCONF_OSTYPE='linux-gnu' -DCONF_MACHTYPE='i686-pc-linux-gnu'
-DCONF_VENDOR='pc' -DLOCALEDIR='/usr/share/locale' -DPACKAGE='bash'
-DSHELL -DHAVE_CONFIG_H -I. -I. -I./include -I./lib -march=i686 -O2
-pipe
uname output: Linux crater 2.6.27-gentoo #1 SMP PREEMPT Mon Oct 13
13:37:45 MDT 2008 i686 Intel(R) Pentium(R) 4 CPU 2.40GHz GenuineIntel
GNU/Linux
Machine Type: i686-pc-linux-gnu
Bash Version: 3.2
Patch Level: 33
Release Status: release
Description:
(Note that this may be hard to reproduce, at least how I did it,
on a stock kernel)
I've been doing some work in the kernel N_TTY line discipline
and pty code, and one issue was that when a tty is stopped
(with ^S) and a lot of input/output happens - enough to fill
the buffer more than 1/2 way, the tty will stop being polled
for more data. Holding down a key, thereby producing a rapid
series of characters, will slowly let the tty continue to
process blocks of characters. I've fixed the issue in the
kernel, but it seems I uncovered a potential bash issue.
Anyway, when testing this with the "tr" program in a bash
shell, I tried holding down ctrl-C. Eventually the tty
got to reading these characters and produced an interrupt
as expected. However, instead of breaking out of tr, as
usual, I got:
"-bash: [6630: 5] tcsetattr: Interrupted system call"
So my question is: is this because there is a small window
of opportunity for ^C to cause tcsetattr() to get interrupted?
Is there any way to close this window if so? Sorry if this
problem has already been addressed in bash 4...
Repeat-By:
Well, without a hacked kernel, you'll probably not hit
*this* manifestation of the issue, but what I did was:
- run a text processing program (like "cat" or "tr")
- hit ctrl-S
- enter lots of text that will then produce lots of output
- hold down ctrl-C until the error is produced
Fix:
Should interrupts be trapped during call to tcsetattr()?
Thanks, Joe
P.S. Please cc my email address in any replies...
