From: Paul Eggert <eggert@cs.ucla.edu>
To: Wolfgang Jenkner <wjenkner@inode.at>
Cc: 19874@debbugs.gnu.org, Ashish SHUKLA <ashish.is@lostca.se>
Subject: bug#19874: 25.0.50; encode-time not working as expected
Date: Sun, 01 Mar 2015 10:28:02 -0800 [thread overview]
Message-ID: <54F35A32.90202@cs.ucla.edu> (raw)
In-Reply-To: <85vbikvewg.fsf@iznogoud.viz>
Wolfgang Jenkner wrote:
> I was simply thinking about something like
>
> q = environ_tmp;
> for (p = environ; *p; p++, q++)
> *q = strdup(*p);
> environ = environ_tmp;
The behavior of getenv, setenv, etc. are undefined after a program modifies
environ[0], environ[1], etc. See POSIX 8.1
<http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap08.html#tag_08_01>.
So, although a POSIX-conforming program can do the above, it can't use getenv
etc. afterwards.
In contrast the putenv-test.c program I sent earlier
<http://bugs.gnu.org/19874#68> doesn't modify environ[0], environ[1], etc., so
it can rely upon getenv etc.
Emacs's problem on FreeBSD occurred because Gnulib's workaround for FreeBSD
putenv's incompatibility with GNU putenv ran afoul of the POSIX 8.1 restriction.
My recent patch worked around the workaround, by telling Emacs to not use
Gnulib's workaround. So fixing the FreeBSD bug exemplified by putenv-test.c
isn't needed to get Emacs to work; still, it's a bug that may bite other programs.
next prev parent reply other threads:[~2015-03-01 18:28 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-02-15 13:40 bug#19874: 25.0.50; encode-time not working as expected Ashish SHUKLA
2015-02-15 23:33 ` Ashish SHUKLA
2015-02-25 17:41 ` Paul Eggert
2015-02-26 0:24 ` Ashish SHUKLA
2015-02-26 8:15 ` Paul Eggert
2015-02-26 13:42 ` Wolfgang Jenkner
2015-02-26 17:36 ` Wolfgang Jenkner
2015-02-26 17:58 ` Paul Eggert
2015-02-26 16:03 ` Ashish SHUKLA
2015-02-26 6:51 ` Ashish SHUKLA
2015-02-26 8:39 ` Paul Eggert
2015-02-26 15:58 ` Ashish SHUKLA
2015-02-27 5:13 ` Paul Eggert
2015-02-26 19:00 ` Wolfgang Jenkner
2015-02-26 19:44 ` Ashish SHUKLA
2015-02-26 20:05 ` Wolfgang Jenkner
2015-02-26 21:47 ` Ashish SHUKLA
2015-02-27 0:16 ` Wolfgang Jenkner
2015-02-27 2:51 ` Wolfgang Jenkner
2015-02-27 4:59 ` Ashish SHUKLA
2015-02-27 6:38 ` Paul Eggert
2015-02-27 8:09 ` Paul Eggert
2015-02-27 8:49 ` Ashish SHUKLA
2015-02-27 6:31 ` Paul Eggert
2015-02-27 8:28 ` Ashish SHUKLA
2015-02-27 16:41 ` Paul Eggert
2015-02-27 17:33 ` Wolfgang Jenkner
2015-02-27 23:54 ` Paul Eggert
2015-02-28 14:10 ` Wolfgang Jenkner
2015-02-28 14:18 ` Wolfgang Jenkner
2015-02-28 19:43 ` Paul Eggert
2015-03-01 16:42 ` Wolfgang Jenkner
2015-03-01 18:28 ` Paul Eggert [this message]
2015-03-01 22:49 ` Wolfgang Jenkner
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