Line data Source code
1 : /* Tests of unsetenv.
2 : Copyright (C) 2009-2020 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 <https://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"
24 : SIGNATURE_CHECK (unsetenv, int, (char const *));
25 :
26 : #include <errno.h>
27 : #include <string.h>
28 : #include <unistd.h>
29 :
30 : #include "macros.h"
31 :
32 : int
33 1 : main (void)
34 : {
35 1 : char entry[] = "b=2";
36 :
37 : /* Test removal when multiple entries present. */
38 1 : ASSERT (putenv ((char *) "a=1") == 0);
39 1 : ASSERT (putenv (entry) == 0);
40 1 : entry[0] = 'a'; /* Unspecified what getenv("a") would be at this point. */
41 1 : ASSERT (unsetenv ("a") == 0); /* Both entries will be removed. */
42 1 : ASSERT (getenv ("a") == NULL);
43 1 : ASSERT (unsetenv ("a") == 0);
44 :
45 : /* Required to fail with EINVAL. */
46 1 : errno = 0;
47 1 : ASSERT (unsetenv ("") == -1);
48 1 : ASSERT (errno == EINVAL);
49 1 : errno = 0;
50 1 : ASSERT (unsetenv ("a=b") == -1);
51 1 : 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 1 : return 0;
61 : }
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