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/* Tests of unsetenv.
Copyright (C) 2009-2022 Free Software Foundation, Inc.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>. */
/* Written by Eric Blake <ebb9@byu.net>, 2009. */
#include <config.h>
#include <stdlib.h>
#include "signature.h"
SIGNATURE_CHECK (unsetenv, int, (char const *));
#include <errno.h>
#include <string.h>
#include <unistd.h>
#include "macros.h"
int
main (void)
{
char entry[] = "b=2";
/* Test removal when multiple entries present. */
ASSERT (putenv ((char *) "a=1") == 0);
ASSERT (putenv (entry) == 0);
entry[0] = 'a'; /* Unspecified what getenv("a") would be at this point. */
ASSERT (unsetenv ("a") == 0); /* Both entries will be removed. */
ASSERT (getenv ("a") == NULL);
ASSERT (unsetenv ("a") == 0);
/* Required to fail with EINVAL. */
errno = 0;
ASSERT (unsetenv ("") == -1);
ASSERT (errno == EINVAL);
errno = 0;
ASSERT (unsetenv ("a=b") == -1);
ASSERT (errno == EINVAL);
#if 0
/* glibc and gnulib's implementation guarantee this, but POSIX no
longer requires it: http://austingroupbugs.net/view.php?id=185 */
errno = 0;
ASSERT (unsetenv (NULL) == -1);
ASSERT (errno == EINVAL);
#endif
return 0;
}
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