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annotate doc/posix-functions/unsetenv.texi @ 13948:4d99f06b61cd

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unsetenv: Add missing declaration on OSF/1 5.1. * 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.
author Bruno Haible <bruno@clisp.org>
date Sun, 19 Dec 2010 18:35:54 +0100
parents 3bbfc7e37ec2
children 1af1ed4871ed
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1 @node unsetenv
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2 @section @code{unsetenv}
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3 @findex unsetenv
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4
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5 POSIX specification:@* @url{http://www.opengroup.org/onlinepubs/9699919799/functions/unsetenv.html}
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6
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7 Gnulib module: unsetenv
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8
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9 Portability problems fixed by Gnulib:
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10 @itemize
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11 @item
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12 This function is missing on some platforms:
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13 AIX 5.1, HP-UX 11.23, IRIX 6.5, Solaris 9, mingw, BeOS.
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14 @item
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15 This function is not declared on some platforms:
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16 OSF/1 5.1.
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17 @item
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18 This function has the return type @samp{void} instead of @samp{int} on some
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19 platforms:
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20 MacOS X 10.3, FreeBSD 6.0, NetBSD 1.6, OpenBSD 3.8, OSF/1 5.1.
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21 @item
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22 On some platforms, this function does not fail with @samp{EINVAL} when
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23 passed an empty string or a string containing @samp{=}:
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24 FreeBSD 6.0, NetBSD 1.6, OpenBSD 4.7.
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25 @item
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26 This function removes only the first value association for the given
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27 environment variable, not all of them, on some platforms:
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28 Solaris 11 2010-11.
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29 @end itemize
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30
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31 Portability problems not fixed by Gnulib:
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32 @itemize
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33 @item
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34 Older versions of POSIX required that @code{unsetenv(NULL)} gracefully
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35 fail with @code{EINVAL}, but not all implementations guarantee this,
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36 and the requirement was removed.
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37 @end itemize