| /* Test sysconf with an empty chroot. |
| Copyright (C) 2017-2018 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| |
| The GNU C Library is free software; you can redistribute it and/or |
| modify it under the terms of the GNU Lesser General Public |
| License as published by the Free Software Foundation; either |
| version 2.1 of the License, or (at your option) any later version. |
| |
| The GNU C Library 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 |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public |
| License along with the GNU C Library; if not, see |
| <http://www.gnu.org/licenses/>. */ |
| |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <support/check.h> |
| #include <support/namespace.h> |
| #include <support/support.h> |
| #include <support/temp_file.h> |
| #include <support/test-driver.h> |
| #include <support/xunistd.h> |
| #include <unistd.h> |
| |
| /* Check for an SMP system in a forked process, so that the parent |
| process does not cache the value. */ |
| static void |
| is_smp_callback (void *closure) |
| { |
| bool *result = closure; |
| |
| long cpus = sysconf (_SC_NPROCESSORS_ONLN); |
| TEST_VERIFY_EXIT (cpus > 0); |
| *result = cpus != 1; |
| } |
| |
| static bool |
| is_smp (void) |
| { |
| bool *result = support_shared_allocate (sizeof (*result)); |
| support_isolate_in_subprocess (is_smp_callback, result); |
| bool result_copy = *result; |
| support_shared_free (result); |
| return result_copy; |
| } |
| |
| static char *path_chroot; |
| |
| /* Prepare an empty directory, to be used as a chroot. */ |
| static void |
| prepare (int argc, char **argv) |
| { |
| path_chroot = xasprintf ("%s/tst-resolv-res_init-XXXXXX", test_dir); |
| if (mkdtemp (path_chroot) == NULL) |
| FAIL_EXIT1 ("mkdtemp (\"%s\"): %m", path_chroot); |
| add_temp_file (path_chroot); |
| } |
| |
| /* The actual test. Run it in a subprocess, so that the test harness |
| can remove the temporary directory in --direct mode. */ |
| static void |
| chroot_callback (void *closure) |
| { |
| xchroot (path_chroot); |
| long cpus = sysconf (_SC_NPROCESSORS_ONLN); |
| printf ("info: sysconf (_SC_NPROCESSORS_ONLN) in chroot: %ld\n", cpus); |
| TEST_VERIFY (cpus > 0); |
| TEST_VERIFY (cpus != 1); |
| _exit (0); |
| } |
| |
| static int |
| do_test (void) |
| { |
| if (!is_smp ()) |
| { |
| printf ("warning: test not supported on uniprocessor system\n"); |
| return EXIT_UNSUPPORTED; |
| } |
| |
| support_become_root (); |
| if (!support_can_chroot ()) |
| return EXIT_UNSUPPORTED; |
| |
| support_isolate_in_subprocess (chroot_callback, NULL); |
| |
| return 0; |
| } |
| |
| #define PREPARE prepare |
| #include <support/test-driver.c> |