gl/tests/test-unsetenv.c

   1 /* Tests of unsetenv.
   2    Copyright (C) 2009-2012 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"
  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   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 }