tests/test-getgroups.c

   1 /* Tests of getgroups.
   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 <unistd.h>
  22
  23 #include "signature.h"
  24 SIGNATURE_CHECK (getgroups, int, (int, gid_t[]));
  25
  26 #include <errno.h>
  27 #include <stdio.h>
  28 #include <stdlib.h>
  29 #include <stdint.h>
  30
  31 #include "macros.h"
  32
  33 int
  34 main (int argc, char **argv _GL_UNUSED)
  35 {
  36   int result;
  37   gid_t *groups;
  38
  39   errno = 0;
  40   result = getgroups (0, NULL);
  41   if (result == -1 && errno == ENOSYS)
  42     {
  43       fputs ("skipping test: no support for groups\n", stderr);
  44       return 77;
  45     }
  46   ASSERT (0 <= result);
  47   ASSERT (result + 1 < SIZE_MAX / sizeof *groups);
  48   groups = malloc ((result + 1) * sizeof *groups);
  49   ASSERT (groups);
  50   groups[result] = -1;
  51   /* Check for EINVAL handling.  Not all processes have supplemental
  52      groups, and getgroups does not have to return the effective gid,
  53      so a result of 0 is reasonable.  Also, we can't test for EINVAL
  54      if result is 1, because of how getgroups treats 0.  */
  55   if (1 < result)
  56     {
  57       errno = 0;
  58       ASSERT (getgroups (result - 1, groups) == -1);
  59       ASSERT (errno == EINVAL);
  60     }
  61   ASSERT (getgroups (result, groups) == result);
  62   ASSERT (getgroups (result + 1, groups) == result);
  63   ASSERT (groups[result] == -1);
  64   errno = 0;
  65   ASSERT (getgroups (-1, NULL) == -1);
  66   ASSERT (errno == EINVAL);
  67
  68   /* The automated unit test, with no arguments, ends here.  However,
  69      for debugging purposes, you can pass a command-line argument to
  70      list the returned groups.  */
  71   if (1 < argc)
  72     {
  73       int i;
  74       for (i = 0; i < result; i++)
  75         printf ("%d\n", (int) groups[i]);
  76     }
  77   free (groups);
  78   return 0;
  79 }