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/* Tests of getgroups.
Copyright (C) 2009-2023 Free Software Foundation, Inc.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>. */
/* Written by Eric Blake <ebb9@byu.net>, 2009. */
#include <config.h>
#include <unistd.h>
#include "signature.h"
SIGNATURE_CHECK (getgroups, int, (int, gid_t[]));
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include "macros.h"
/* Tell GCC not to warn about the specific edge cases tested here.
GCC >= 10 with glibc >= 2.32 would otherwise trigger warnings, even without
any -W options, because getgroups() is declared with
__attribute__ ((__access__ (__write_only__, 2, 1)))
*/
#if __GNUC__ >= 7
# pragma GCC diagnostic ignored "-Wstringop-overflow"
#endif
int
main (int argc, _GL_UNUSED char **argv)
{
int result;
gid_t *groups;
errno = 0;
result = getgroups (0, NULL);
if (result == -1 && errno == ENOSYS)
{
fputs ("skipping test: no support for groups\n", stderr);
return 77;
}
ASSERT (0 <= result);
ASSERT (result + 1 < SIZE_MAX / sizeof *groups);
groups = malloc ((result + 1) * sizeof *groups);
ASSERT (groups);
groups[result] = -1;
/* Check for EINVAL handling. Not all processes have supplemental
groups, and getgroups does not have to return the effective gid,
so a result of 0 is reasonable. Also, we can't test for EINVAL
if result is 1, because of how getgroups treats 0. */
if (1 < result)
{
errno = 0;
ASSERT (getgroups (result - 1, groups) == -1);
ASSERT (errno == EINVAL);
}
ASSERT (getgroups (result, groups) == result);
ASSERT (getgroups (result + 1, groups) == result);
ASSERT (groups[result] == -1);
errno = 0;
ASSERT (getgroups (-1, NULL) == -1);
ASSERT (errno == EINVAL);
/* The automated unit test, with no arguments, ends here. However,
for debugging purposes, you can pass a command-line argument to
list the returned groups. */
if (1 < argc)
{
int i;
for (i = 0; i < result; i++)
printf ("%d\n", (int) groups[i]);
}
free (groups);
return 0;
}
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