96 lines
2.6 KiB
C
96 lines
2.6 KiB
C
/* Test sysconf with an empty chroot.
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Copyright (C) 2017-2019 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library 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 GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <stdio.h>
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#include <stdlib.h>
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#include <support/check.h>
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#include <support/namespace.h>
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#include <support/support.h>
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#include <support/temp_file.h>
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#include <support/test-driver.h>
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#include <support/xunistd.h>
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#include <unistd.h>
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/* Check for an SMP system in a forked process, so that the parent
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process does not cache the value. */
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static void
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is_smp_callback (void *closure)
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{
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bool *result = closure;
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long cpus = sysconf (_SC_NPROCESSORS_ONLN);
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TEST_VERIFY_EXIT (cpus > 0);
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*result = cpus != 1;
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}
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static bool
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is_smp (void)
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{
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bool *result = support_shared_allocate (sizeof (*result));
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support_isolate_in_subprocess (is_smp_callback, result);
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bool result_copy = *result;
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support_shared_free (result);
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return result_copy;
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}
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static char *path_chroot;
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/* Prepare an empty directory, to be used as a chroot. */
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static void
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prepare (int argc, char **argv)
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{
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path_chroot = xasprintf ("%s/tst-resolv-res_init-XXXXXX", test_dir);
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if (mkdtemp (path_chroot) == NULL)
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FAIL_EXIT1 ("mkdtemp (\"%s\"): %m", path_chroot);
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add_temp_file (path_chroot);
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}
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/* The actual test. Run it in a subprocess, so that the test harness
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can remove the temporary directory in --direct mode. */
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static void
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chroot_callback (void *closure)
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{
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xchroot (path_chroot);
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long cpus = sysconf (_SC_NPROCESSORS_ONLN);
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printf ("info: sysconf (_SC_NPROCESSORS_ONLN) in chroot: %ld\n", cpus);
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TEST_VERIFY (cpus > 0);
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TEST_VERIFY (cpus != 1);
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_exit (0);
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}
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static int
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do_test (void)
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{
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if (!is_smp ())
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{
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printf ("warning: test not supported on uniprocessor system\n");
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return EXIT_UNSUPPORTED;
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}
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support_become_root ();
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if (!support_can_chroot ())
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return EXIT_UNSUPPORTED;
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support_isolate_in_subprocess (chroot_callback, NULL);
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return 0;
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}
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#define PREPARE prepare
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#include <support/test-driver.c>
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