/* Copyright (C) 1991, 1992 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, 1992 Free Software Foundation, Inc., 675 Mass Ave,
Cambridge, MA 02139, USA.  */

/*
 *	POSIX Standard: 3.2.1 Wait for Process Termination	<sys/wait.h>
 */

#ifndef	_SYS_WAIT_H

#define	_SYS_WAIT_H	1
#include <features.h>

__BEGIN_DECLS

#include <gnu/types.h>
#include <gnu/wait.h>


#define	WNOHANG		__WNOHANG
#define	WUNTRACED	__WUNTRACED


/* Encoding of the status word.  */

#include <endian.h>

#ifdef	__USE_BSD
union __wait
{
#ifdef	__LITTLE_ENDIAN
  struct
  {
    unsigned int __w_termsig:7;
    unsigned int __w_coredump:1;
    unsigned int __w_retcode:8;
    unsigned int:16;
  } __wait_status;
#else /* Big endian.  */
  struct
  {
    unsigned int:16;
    unsigned int __w_retcode:8;
    unsigned int __w_coredump:1;
    unsigned int __w_termsig:7;
  } __wait_status;
#endif /* Little endian.  */
};

#define	w_termsig	__wait_status.__w_termsig
#define	w_coredump	__wait_status.__w_coredump
#define	w_retcode	__wait_status.__w_retcode
#define	w_stopsig	w_retcode

#ifdef	__GNUC__
#define	__WAIT_INT(status)						      \
  (__extension__ ({ union { __typeof(status) __in; int __i; } __u;	      \
		    __u.__in = (status); __u.__i; }))
#else
#define	__WAIT_INT(status)	(*(int *) &(status))
#endif

/* This is the type of the argument to `wait'.
   With GCC v2, this will be a strange union.  */

#define	__WAIT_STATUS	__ptr_t

#else /* Don't use BSD.  */

#define	__WAIT_INT(status)	(status)

#define	__WAIT_STATUS	int *

#endif /* Use BSD.  */

#define	WEXITSTATUS(status)	__WEXITSTATUS(__WAIT_INT(status))
#define	WTERMSIG(status)	__WTERMSIG(__WAIT_INT(status))
#define	WSTOPSIG(status)	__WSTOPSIG(__WAIT_INT(status))
#define	WIFEXITED(status)	__WIFEXITED(__WAIT_INT(status))
#define	WIFSIGNALED(status)	__WIFSIGNALED(__WAIT_INT(status))
#define	WIFSTOPPED(status)	__WIFSTOPPED(__WAIT_INT(status))

#ifdef	__USE_BSD
#define	WCOREDUMP(status)	__WCOREDUMP(__WAIT_INT(status))
#define	W_EXITCODE(ret, sig)	__W_EXITCODE(ret, sig)
#define	W_STOPCODE(sig)		__W_STOPCODE(sig)
#endif


/* Wait for a child to die.  When one does, put its status in *STAT_LOC
   and return its process ID.  For errors, return (pid_t) -1.  */
extern __pid_t __wait __P ((__WAIT_STATUS __stat_loc));
extern __pid_t wait __P ((__WAIT_STATUS __stat_loc));

#ifdef	__USE_BSD
/* Special values for the PID argument to `waitpid' and `wait4'.  */
#define	WAIT_ANY	(-1)	/* Any process.  */
#define	WAIT_MYPGRP	0	/* Any process in my process group.  */
#endif

/* 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.  */
extern __pid_t __waitpid __P ((__pid_t __pid, int *__stat_loc,
			       int __options));
#ifdef	__USE_BSD
struct rusage;

/* Wait for a child to exit.  When one does, put its status in *STAT_LOC and
   return its process ID.  For errors return (pid_t) -1.  If USAGE is not
   nil, store information about the child's resource usage there.  If the
   WUNTRACED bit is set in OPTIONS, return status for stopped children;
   otherwise don't.  */
extern __pid_t __wait3 __P ((union __wait * __stat_loc,
			     int __options, struct rusage * __usage));
#define	wait3	__wait3

/* PID is like waitpid.  Other args are like wait3.  */
extern __pid_t __wait4 __P ((__pid_t __pid, union __wait * __stat_loc,
			     int __options, struct rusage * __usage));
#define	wait4	__wait4
#endif /* Use BSD.  */

#define	waitpid	__waitpid
#define	wait	__wait


__END_DECLS

#endif /* sys/wait.h  */