/* Tests of getgroups. Copyright (C) 2009-2018 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 . */ /* Written by Eric Blake , 2009. */ #include #include #include "signature.h" SIGNATURE_CHECK (getgroups, int, (int, gid_t[])); #include #include #include #include #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; }