1/* Tests of unsetenv.
2   Copyright (C) 2009, 2010 Free Software Foundation, Inc.
3
4   This program is free software: you can redistribute it and/or modify
5   it under the terms of the GNU General Public License as published by
6   the Free Software Foundation; either version 3 of the License, or
7   (at your option) any later version.
8
9   This program is distributed in the hope that it will be useful,
10   but WITHOUT ANY WARRANTY; without even the implied warranty of
11   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
12   GNU General Public License for more details.
13
14   You should have received a copy of the GNU General Public License
15   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
16
17/* Written by Eric Blake <ebb9@byu.net>, 2009.  */
18
19#include <config.h>
20
21#include <stdlib.h>
22
23#include "signature.h"
24SIGNATURE_CHECK (unsetenv, int, (char const *));
25
26#include <errno.h>
27#include <string.h>
28#include <unistd.h>
29
30#include "macros.h"
31
32int
33main (void)
34{
35  char entry[] = "b=2";
36
37  /* Test removal when multiple entries present.  */
38  ASSERT (putenv ((char *) "a=1") == 0);
39  ASSERT (putenv (entry) == 0);
40  entry[0] = 'a'; /* Unspecified what getenv("a") would be at this point.  */
41  ASSERT (unsetenv ("a") == 0); /* Both entries will be removed.  */
42  ASSERT (getenv ("a") == NULL);
43  ASSERT (unsetenv ("a") == 0);
44
45  /* Required to fail with EINVAL.  */
46  errno = 0;
47  ASSERT (unsetenv ("") == -1);
48  ASSERT (errno == EINVAL);
49  errno = 0;
50  ASSERT (unsetenv ("a=b") == -1);
51  ASSERT (errno == EINVAL);
52#if 0
53  /* glibc and gnulib's implementation guarantee this, but POSIX no
54     longer requires it: http://austingroupbugs.net/view.php?id=185  */
55  errno = 0;
56  ASSERT (unsetenv (NULL) == -1);
57  ASSERT (errno == EINVAL);
58#endif
59
60  return 0;
61}
62