/* Wrapper for the mlock2 system call with fallback to mlock.

   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 <sys/mman.h>

#include <errno.h>

#include <sysdep.h>

int

mlock2 (const void *addr, size_t length, unsigned int flags)

{

#ifdef __ASSUME_MLOCK2

  return INLINE_SYSCALL_CALL (mlock2, addr, length, flags);

#else

  if (flags == 0)

    return INLINE_SYSCALL_CALL (mlock, addr, length);

# ifdef __NR_mlock2

  int ret = INLINE_SYSCALL_CALL (mlock2, addr, length, flags);

  if (ret == 0 || errno != ENOSYS)

    return ret;

# endif /* __NR_mlock2 */

  /* Treat the missing system call as an invalid (non-zero) flag

     argument.  */

  __set_errno (EINVAL);

  return -1;

#endif /* __ASSUME_MLOCK2 */

}