Update.

[glibc.git] / sysdeps / generic / waitpid.c

/* Copyright (C) 1991, 1995, 1996, 1997 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 Library General Public License as
   published by the Free Software Foundation; either version 2 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
   Library General Public License for more details.

   You should have received a copy of the GNU Library General Public
   License along with the GNU C Library; see the file COPYING.LIB.  If not,
   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
   Boston, MA 02111-1307, USA.  */

#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
__libc_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;
}
weak_alias (__libc_waitpid, __waitpid)
weak_alias (__libc_waitpid, waitpid)

stub_warning (waitpid)
#include <stub-tag.h>