tests/test-unsetenv.c

   1 /* Tests of unsetenv.
   2    Copyright (C) 2009-2024 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 main (void)
  34 {
  35   /* Static to pacify gcc -Wanalyzer-putenv-of-auto-var.  */
  36   static char entry[] = "b=2";
  37
  38   /* Test removal when multiple entries present.  */
  39   ASSERT (putenv ((char *) "a=1") == 0);
  40   ASSERT (putenv (entry) == 0);
  41   entry[0] = 'a'; /* Unspecified what getenv("a") would be at this point.  */
  42   ASSERT (unsetenv ("a") == 0); /* Both entries will be removed.  */
  43   ASSERT (getenv ("a") == NULL);
  44   ASSERT (unsetenv ("a") == 0);
  45
  46   /* Required to fail with EINVAL.  */
  47   errno = 0;
  48   ASSERT (unsetenv ("") == -1);
  49   ASSERT (errno == EINVAL);
  50   errno = 0;
  51   ASSERT (unsetenv ("a=b") == -1);
  52   ASSERT (errno == EINVAL);
  53 #if 0
  54   /* glibc and gnulib's implementation guarantee this, but POSIX no
  55      longer requires it: http://austingroupbugs.net/view.php?id=185  */
  56   errno = 0;
  57   ASSERT (unsetenv (NULL) == -1);
  58   ASSERT (errno == EINVAL);
  59 #endif
  60
  61   return test_exit_status;
  62 }