/* 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>