/* Copyright (C) 2003-2018 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 <time.h>

#include <errno.h>

#include <sysdep-cancel.h>

#include "kernel-posix-cpu-timers.h"

#include <shlib-compat.h>

/* We can simply use the syscall.  The CPU clocks are not supported

   with this function.  */

int

__clock_nanosleep (clockid_t clock_id, int flags, const struct timespec *req,

		   struct timespec *rem)

{

  INTERNAL_SYSCALL_DECL (err);

  int r;

  if (clock_id == CLOCK_THREAD_CPUTIME_ID)

    return EINVAL;

  if (clock_id == CLOCK_PROCESS_CPUTIME_ID)

    clock_id = MAKE_PROCESS_CPUCLOCK (0, CPUCLOCK_SCHED);

  if (SINGLE_THREAD_P)

    r = INTERNAL_SYSCALL (clock_nanosleep, err, 4, clock_id, flags, req, rem);

  else

    {

      int oldstate = LIBC_CANCEL_ASYNC ();

      r = INTERNAL_SYSCALL (clock_nanosleep, err, 4, clock_id, flags, req,

			    rem);

      LIBC_CANCEL_RESET (oldstate);

    }

  return (INTERNAL_SYSCALL_ERROR_P (r, err)

	  ? INTERNAL_SYSCALL_ERRNO (r, err) : 0);

}

versioned_symbol (libc, __clock_nanosleep, clock_nanosleep, GLIBC_2_17);

/* clock_nanosleep moved to libc in version 2.17;

   old binaries may expect the symbol version it had in librt.  */

#if SHLIB_COMPAT (libc, GLIBC_2_2, GLIBC_2_17)

strong_alias (__clock_nanosleep, __clock_nanosleep_2);

compat_symbol (libc, __clock_nanosleep_2, clock_nanosleep, GLIBC_2_2);

#endif