/* Test the mlock2 function.

   Copyright (C) 2017-2018 Free Software Foundation, Inc.

   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 <errno.h>

#include <stdio.h>

#include <support/check.h>

#include <support/xunistd.h>

#include <sys/mman.h>

/* Allocate a page using mmap.  */

static void *

get_page (void)

{

  return xmmap (NULL, 1, PROT_READ | PROT_WRITE,

                MAP_ANONYMOUS | MAP_PRIVATE, -1);

}

static int

do_test (void)

{

  /* Current kernels have a small reserve of locked memory, so this

     test does not need any privileges to run.  */

  void *page = get_page ();

  if (mlock (page, 1) != 0)

    FAIL_EXIT1 ("mlock: %m\n");

  xmunmap (page, 1);

  page = get_page ();

  if (mlock2 (page, 1, 0) != 0)

    /* Should be implemented using mlock if necessary.  */

    FAIL_EXIT1 ("mlock2 (0): %m\n");

  xmunmap (page, 1);

  page = get_page ();

  int ret = mlock2 (page, 1, MLOCK_ONFAULT);

  if (ret != 0)

    {

      TEST_VERIFY (ret == -1);

      if (errno != EINVAL)

        /* EINVAL means the system does not support the mlock2 system

           call.  */

        FAIL_EXIT1 ("mlock2 (0): %m\n");

      else

        puts ("warning: mlock2 system call not supported");

    }

  xmunmap (page, 1);

  return 0;

}

#include <support/test-driver.c>