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1820a91386
* lib/stdlib.in.h (setenv): Test HAVE_DECL_UNSETENV, not HAVE_UNSETENV. * m4/setenv.m4 (gl_FUNC_UNSETENV): Test whether unsetenv is declared. Don't set HAVE_UNSETENV. In the test program, set _BSD. * m4/stdlib_h.m4 (gl_STDLIB_H_DEFAULTS): Initialize HAVE_DECL_UNSETENV, not HAVE_UNSETENV. * modules/stdlib (Makefile.am): Substitute HAVE_DECL_UNSETENV, not HAVE_UNSETENV. * doc/posix-functions/unsetenv.texi: Mention the OSF/1 5.1 problem.
38 lines
1.1 KiB
Plaintext
38 lines
1.1 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: unsetenv
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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 11.23, IRIX 6.5, Solaris 9, mingw, BeOS.
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@item
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This function is not declared on some platforms:
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OSF/1 5.1.
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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 4.7.
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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 11 2010-11.
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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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