From: Daniel Colascione <dancol@dancol.org>
To: Troels Nielsen <bn.troels@gmail.com>
Cc: Vincent Lefevre <vincent@vinc17.net>, 8705@debbugs.gnu.org
Subject: bug#8705: 23.3; Emacs occasionally crashes (segfault) just after starting it
Date: Fri, 06 Jul 2012 15:51:58 -0700 [thread overview]
Message-ID: <4FF76C0E.9090505@dancol.org> (raw)
In-Reply-To: <CAOdE5WRePjBPJa6=GeeRmtN+5tDD=zTd_9Syrfes68ZowCFALQ@mail.gmail.com>
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On 7/6/2012 1:32 PM, Troels Nielsen wrote:
> It appears this is due to Fcall_process not restoring environ before
> after UNBLOCK_INPUT. This is too late in your case.
>
> The patch below against trunk, ought to fix it with minimal
> intervention. But I think a better fix would be to abandon the use of
> vfork and just use fork (which should be almost as fast), as the work
> in the child process after vfork is undefined behavior as far as I can
> understand.
Better yet, we can use posix_spawn, falling back to gnulib's
implementation of posix_spawn in terms of fork or vfork. Unfortunately,
posix_spawn has no way of telling the child to setsid, so the best we
could do would be setpgrp. I have patches to use posix_spawn in the
call_process case, but not the async case.
I'm not entirely sure how much of a difference avoiding setsid makes. In
the meantime, retaining support for vfork would be nice, because on some
platforms, like Cygwin, fork is still very slow.
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next prev parent reply other threads:[~2012-07-06 22:51 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-05-20 8:54 bug#8705: 23.3; Emacs occasionally crashes (segfault) just after starting it Vincent Lefevre
2011-05-20 9:12 ` Vincent Lefevre
2011-05-20 10:40 ` Eli Zaretskii
2011-05-20 11:16 ` Vincent Lefevre
2011-05-20 11:38 ` Eli Zaretskii
2011-05-20 12:59 ` Vincent Lefevre
2011-09-20 14:51 ` Vincent Lefevre
2012-07-06 11:13 ` Vincent Lefevre
2012-07-06 20:32 ` Troels Nielsen
2012-07-06 22:51 ` Daniel Colascione [this message]
2012-07-07 15:08 ` Troels Nielsen
2014-09-22 13:06 ` Vincent Lefevre
2014-09-27 4:10 ` Stefan Monnier
2014-10-09 20:03 ` Glenn Morris
2014-10-12 2:40 ` bug#8705: Emacs 24.3 " Paul Eggert
2014-10-12 6:19 ` Paul Eggert
2014-10-14 18:36 ` Stefan Monnier
2014-10-14 18:44 ` Glenn Morris
2014-10-14 18:45 ` Glenn Morris
2014-10-14 18:52 ` Glenn Morris
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