[Top][All Lists]
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
putenv documentation
From: |
Michael Wardle |
Subject: |
putenv documentation |
Date: |
Tue, 28 Sep 2004 15:18:01 +1000 |
User-agent: |
Mutt/1.5.6+20040722i |
Hi
According to the GNU autoconf documentation in 2.59 and HEAD:
POSIX specifies that `putenv("FOO")' removes `FOO' from the
environment, but on some systems (eg. FreeBSD 4) this is not the
case and instead `unsetenv' must be used.
The latest revision of the POSIX (IEEE Std 1003.1-2004) does not support
this claim. The only valid form it seems to support is name=value:
The putenv() function shall use the string argument to set
environment variable values. The string argument should point to
a string of the form " name= value ".
<http://www.unix.org/onlinepubs/009695399/functions/putenv.html>
I also note that on AIX 4.3, which claims to be conformant to UNIX95,
a call to putenv() with a non-null string not containing a '=' causes
a segmentation fault, so such a statement might have unfortunate
consequences for developers attempting to write POSIX-conformant code.
Is somebody able to verify this statement, or perhaps rephrase or delete
it as appropriate?
Thanks
--
Michael Wardle <address@hidden>
- putenv documentation,
Michael Wardle <=