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91e21656de
Requiring that {un,}setenv gracefully reject NULL is just a waste
of processing power; POSIX agreed to this argument in
http://austingroupbugs.net/view.php?id=185
so we no longer worry whether a native implementation handles NULL.
* m4/setenv.m4 (gl_FUNC_SETENV_SEPARATE): Test handling of "" but
not NULL.
* tests/test-setenv.c (main): Relax test.
* tests/test-unsetenv.c (main): Likewise.
* doc/posix-functions/setenv.texi (setenv): Document this.
* doc/posix-functions/unsetenv.texi (unsetenv): Likewise.
Signed-off-by: Eric Blake <ebb9@byu.net>
35 lines
1.0 KiB
Plaintext
35 lines
1.0 KiB
Plaintext
@node unsetenv
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@section @code{unsetenv}
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@findex unsetenv
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POSIX specification: @url{http://www.opengroup.org/onlinepubs/9699919799/functions/unsetenv.html}
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Gnulib module: setenv
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Portability problems fixed by Gnulib:
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@itemize
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@item
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This function is missing on some platforms:
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AIX 5.1, HP-UX 11, IRIX 6.5, Solaris 9, mingw, BeOS.
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@item
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This function has the return type @samp{void} instead of @samp{int} on some
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platforms:
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MacOS X 10.3, FreeBSD 6.0, NetBSD 1.6, OpenBSD 3.8, OSF/1 5.1.
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@item
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On some platforms, this function does not fail with @samp{EINVAL} when
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passed an empty string or a string containing @samp{=}:
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FreeBSD 6.0, NetBSD 1.6, OpenBSD 3.8.
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@item
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This function removes only the first value association for the given
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environment variable, not all of them, on some platforms:
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Solaris 10.
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@end itemize
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Portability problems not fixed by Gnulib:
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@itemize
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@item
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Older versions of POSIX required that @code{unsetenv(NULL)} gracefully
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fail with @code{EINVAL}, but not all implementations guarantee this,
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and the requirement was removed.
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@end itemize
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