| /* Tests of getgroups. |
| Copyright (C) 2009-2020 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" |
| |
| int |
| main (int argc, char **argv _GL_UNUSED) |
| { |
| 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; |
| } |