nss/tst-nss-db-endgrent.c

   1 /* Test for endgrent changing errno for BZ #24696
   2    Copyright (C) 2019-2023 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <https://www.gnu.org/licenses/>.  */
  18
  19 #include <stdlib.h>
  20 #include <sys/types.h>
  21 #include <grp.h>
  22 #include <unistd.h>
  23 #include <errno.h>
  24
  25 #include <support/check.h>
  26 #include <support/support.h>
  27
  28 /* The following test verifies that if the db NSS Service is initialized
  29    with no database (getgrent), that a subsequent closure (endgrent) does
  30    not set errno. In the case of the db service it is not an error to close
  31    the service and so it should not set errno.  */
  32
  33 static int
  34 do_test (void)
  35 {
  36   /* Just make sure it's not there, although usually it won't be.  */
  37   unlink ("/var/db/group.db");
  38
  39   /* This, in conjunction with the testroot's nsswitch.conf, causes
  40      the nss_db module to be "connected" and initialized - but the
  41      testroot has no group.db, so no mapping will be created.  */
  42   getgrent ();
  43
  44   errno = 0;
  45
  46   /* Before the fix, this would call munmap (NULL) and set errno.  */
  47   endgrent ();
  48
  49   if (errno != 0)
  50     FAIL_EXIT1 ("endgrent set errno to %d\n", errno);
  51
  52   return 0;
  53 }
  54 #include <support/test-driver.c>