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80 lines
2.3 KiB
C
80 lines
2.3 KiB
C
/* Tests of getgroups.
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Copyright (C) 2009-2017 Free Software Foundation, Inc.
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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/* Written by Eric Blake <ebb9@byu.net>, 2009. */
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#include <config.h>
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#include <unistd.h>
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#include "signature.h"
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SIGNATURE_CHECK (getgroups, int, (int, gid_t[]));
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#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdint.h>
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#include "macros.h"
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int
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main (int argc, char **argv _GL_UNUSED)
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{
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int result;
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gid_t *groups;
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errno = 0;
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result = getgroups (0, NULL);
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if (result == -1 && errno == ENOSYS)
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{
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fputs ("skipping test: no support for groups\n", stderr);
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return 77;
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}
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ASSERT (0 <= result);
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ASSERT (result + 1 < SIZE_MAX / sizeof *groups);
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groups = malloc ((result + 1) * sizeof *groups);
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ASSERT (groups);
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groups[result] = -1;
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/* Check for EINVAL handling. Not all processes have supplemental
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groups, and getgroups does not have to return the effective gid,
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so a result of 0 is reasonable. Also, we can't test for EINVAL
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if result is 1, because of how getgroups treats 0. */
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if (1 < result)
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{
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errno = 0;
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ASSERT (getgroups (result - 1, groups) == -1);
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ASSERT (errno == EINVAL);
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}
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ASSERT (getgroups (result, groups) == result);
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ASSERT (getgroups (result + 1, groups) == result);
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ASSERT (groups[result] == -1);
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errno = 0;
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ASSERT (getgroups (-1, NULL) == -1);
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ASSERT (errno == EINVAL);
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/* The automated unit test, with no arguments, ends here. However,
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for debugging purposes, you can pass a command-line argument to
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list the returned groups. */
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if (1 < argc)
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{
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int i;
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for (i = 0; i < result; i++)
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printf ("%d\n", (int) groups[i]);
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}
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free (groups);
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return 0;
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}
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