/* Copyright (C) 1991-2018 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 <errno.h>

#include <sys/wait.h>

#include <sys/types.h>

/* Wait for a child matching PID to die.

   If PID is greater than 0, match any process whose process ID is PID.

   If PID is (pid_t) -1, match any process.

   If PID is (pid_t) 0, match any process with the

   same process group as the current process.

   If PID is less than -1, match any process whose

   process group is the absolute value of PID.

   If the WNOHANG bit is set in OPTIONS, and that child

   is not already dead, return (pid_t) 0.  If successful,

   return PID and store the dead child's status in STAT_LOC.

   Return (pid_t) -1 for errors.  If the WUNTRACED bit is set in OPTIONS,

   return status for stopped children; otherwise don't.  */

pid_t

__waitpid (pid_t pid, int *stat_loc, int options)

{

  if ((options & ~(WNOHANG|WUNTRACED)) != 0)

    {

      __set_errno (EINVAL);

      return (pid_t) -1;

    }

  __set_errno (ENOSYS);

  return (pid_t) -1;

}

libc_hidden_def (__waitpid)

weak_alias (__waitpid, waitpid)

stub_warning (waitpid)