* Shell exits on bad coproc redirection @ 2001-08-17 15:42 Bart Schaefer 2001-08-17 16:05 ` Peter Stephenson 2001-08-23 1:34 ` Geoff Wing 0 siblings, 2 replies; 4+ messages in thread From: Bart Schaefer @ 2001-08-17 15:42 UTC (permalink / raw) To: zsh-workers This affects 3.0.8 and 4.0.1 as well as 4.1.0-dev-1, but NOT 3.0.6. schaefer[503] Src/zsh -f zagzig% echo $ZSH_VERSION 4.1.0-dev-1 zagzig% print >&p zsh: coprocess: bad file descriptor zagzig% coproc sleep 1 [1] 14033 zagzig% [1] + done sleep 1 zagzig% print >&p schaefer[504] echo $? 141 So the shell is dying of a SIGPIPE. The problem seems to be a combination of these two items (ChangeLog-3.1): 1999-10-10 Bart Schaefer <schaefer@zsh.org> * Src/exec.c: Plug lead of a copy of the coproc input descriptor. (ahem, that should say "leak"). Sun May 18 18:57:08 1997 Zolt<E1>n Hidv<E9>gi <hzoli@cs.elte.hu> * Src/builtin.c, Src/exec.c, Src/init.c, Src/signals.c, Src/jobs.c: Do not handle SIGPIPE specially for shells with job control Anybody remember why we stopped handling SIGPIPE? Is Zoltan still out there anywhere? -- Bart Schaefer Brass Lantern Enterprises http://www.well.com/user/barts http://www.brasslantern.com Zsh: http://www.zsh.org | PHPerl Project: http://phperl.sourceforge.net ^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: Shell exits on bad coproc redirection 2001-08-17 15:42 Shell exits on bad coproc redirection Bart Schaefer @ 2001-08-17 16:05 ` Peter Stephenson 2001-08-17 16:34 ` Bart Schaefer 2001-08-23 1:34 ` Geoff Wing 1 sibling, 1 reply; 4+ messages in thread From: Peter Stephenson @ 2001-08-17 16:05 UTC (permalink / raw) To: Zsh hackers list Bart Schaefer wrote: > The problem seems to be a combination of these two items (ChangeLog-3.1): > > 1999-10-10 Bart Schaefer <schaefer@zsh.org> > > * Src/exec.c: Plug lead of a copy of the coproc input descriptor. > > (ahem, that should say "leak"). > > Sun May 18 18:57:08 1997 Zolt<E1>n Hidv<E9>gi <hzoli@cs.elte.hu> > > * Src/builtin.c, Src/exec.c, Src/init.c, Src/signals.c, Src/jobs.c: > Do not handle SIGPIPE specially for shells with job control > > Anybody remember why we stopped handling SIGPIPE? Is Zoltan still out there > anywhere? Presumably that's the root of the near-discussion we had just before the last release: >> There's the SIGPIPE issue from 12223 (only partly fixed by 12222?). > > I haven't thought about this since, but after jogging my memory by reading > 12223, 12222 is good enough for the real problem, and the rest was just my > paranoia. The issue was that if a `tee' spawned by a multio exits early, > the parent shell will get SIGPIPE and exit, too; but that's probably not a > bug. Multios and coprocs are pretty similar in this respect. I'm not particularly attached to `probably not a bug'; I would probably trade it in for `seems to reflect the current intention of the code' in return for a go on your playstation. -- Peter Stephenson <pws@csr.com> Software Engineer CSR Ltd., Unit 300, Science Park, Milton Road, Cambridge, CB4 0XL, UK Tel: +44 (0)1223 392070 ********************************************************************** The information transmitted is intended only for the person or entity to which it is addressed and may contain confidential and/or privileged material. Any review, retransmission, dissemination or other use of, or taking of any action in reliance upon, this information by persons or entities other than the intended recipient is prohibited. If you received this in error, please contact the sender and delete the material from any computer. ********************************************************************** ^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: Shell exits on bad coproc redirection 2001-08-17 16:05 ` Peter Stephenson @ 2001-08-17 16:34 ` Bart Schaefer 0 siblings, 0 replies; 4+ messages in thread From: Bart Schaefer @ 2001-08-17 16:34 UTC (permalink / raw) To: Peter Stephenson, Zsh hackers list On Aug 17, 5:05pm, Peter Stephenson wrote: } Subject: Re: Shell exits on bad coproc redirection } } > Sun May 18 18:57:08 1997 Zoltan Hidvegi <hzoli@cs.elte.hu> } > } > Do not handle SIGPIPE specially for shells with job control ^^^^^^^^^^^^^^^^^^^^^^^^^^^ [">" now quotes something different] } > paranoia. The issue was that if a `tee' spawned by a multio exits early, } > the parent shell will get SIGPIPE and exit, too; but that's probably not a } > bug. } } Multios and coprocs are pretty similar in this respect. I'm not } particularly attached to `probably not a bug'; I would probably trade it in } for `seems to reflect the current intention of the code' in return for a go } on your playstation. If we were talking about a shell script, I'd be completely in agreement. But Zoltan's log entry is talking about shells with job control. Why should an interactive shell ever exit on SIGPIPE? -- Bart Schaefer Brass Lantern Enterprises http://www.well.com/user/barts http://www.brasslantern.com Zsh: http://www.zsh.org | PHPerl Project: http://phperl.sourceforge.net ^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: Shell exits on bad coproc redirection 2001-08-17 15:42 Shell exits on bad coproc redirection Bart Schaefer 2001-08-17 16:05 ` Peter Stephenson @ 2001-08-23 1:34 ` Geoff Wing 1 sibling, 0 replies; 4+ messages in thread From: Geoff Wing @ 2001-08-23 1:34 UTC (permalink / raw) To: zsh-workers Bart Schaefer <schaefer@brasslantern.com> typed: : This affects 3.0.8 and 4.0.1 as well as 4.1.0-dev-1, but NOT 3.0.6. [...] : So the shell is dying of a SIGPIPE. : Sun May 18 18:57:08 1997 Zolt<E1>n Hidv<E9>gi <hzoli@cs.elte.hu> : * Src/builtin.c, Src/exec.c, Src/init.c, Src/signals.c, Src/jobs.c: : Do not handle SIGPIPE specially for shells with job control : Anybody remember why we stopped handling SIGPIPE? Is Zoltan still out there : anywhere? http://www.zsh.org/cgi-bin/mla/redirect?WORKERNUMBER=3157 ^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2001-08-23 1:34 UTC | newest] Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2001-08-17 15:42 Shell exits on bad coproc redirection Bart Schaefer 2001-08-17 16:05 ` Peter Stephenson 2001-08-17 16:34 ` Bart Schaefer 2001-08-23 1:34 ` Geoff Wing
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