/*-
 * Copyright (c) 1982, 1986, 1989, 1993, 1994
 *	The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *	@(#)wait.h	8.2 (Berkeley) 7/10/94
 * $FreeBSD: src/sys/sys/wait.h,v 1.20 2004/04/09 13:14:32 bde Exp $
 */

#ifndef _SYS_WAIT_H_
#define _SYS_WAIT_H_

#include <sys/cdefs.h>

/*
 * This file holds definitions relevant to the wait4 system call and the
 * alternate interfaces that use it (wait, wait3, waitpid).
 */

/*
 * Macros to test the exit status returned by wait and extract the relevant
 * values.
 */
#if __BSD_VISIBLE
#define	_W_INT(w)	(*(int *)&(w))	/* Convert union wait to int. */
#define	WCOREFLAG	0200
#else
#define	_W_INT(i)	(i)
#endif

#define	_WSTATUS(x)	(_W_INT(x) & 0177)
#define	_WSTOPPED	0177		/* _WSTATUS if process is stopped */
#define	WIFSTOPPED(x)	(_WSTATUS(x) == _WSTOPPED)
#define	WSTOPSIG(x)	(_W_INT(x) >> 8)
#define	WIFSIGNALED(x)	(_WSTATUS(x) != 0 && !WIFSTOPPED(x) && !WIFCONTINUED(x)) /* bird: made GLIBC tests happy. */
#define	WTERMSIG(x)	(_WSTATUS(x))
#define	WIFEXITED(x)	(_WSTATUS(x) == 0)
#define	WEXITSTATUS(x)	(_W_INT(x) >> 8)
#define	WIFCONTINUED(x)	(x == 0x13)	/* 0x13 == SIGCONT */
#if __BSD_VISIBLE
#define	WCOREDUMP(x)	(_W_INT(x) & WCOREFLAG)

#define	W_EXITCODE(ret, sig)	((ret) << 8 | (sig))
#define	W_STOPCODE(sig)		((sig) << 8 | _WSTOPPED)
#endif

/*
 * Option bits for the third argument of wait4.  WNOHANG causes the
 * wait to not hang if there are no stopped or terminated processes, rather
 * returning an error indication in this case (pid==0).  WUNTRACED
 * indicates that the caller should receive status about untraced children
 * which stop due to signals.  If children are stopped and a wait without
 * this option is done, it is as though they were still running... nothing
 * about them is returned.
 */
#define	WNOHANG		1	/* Don't hang in wait. */
#define	WUNTRACED	2	/* Tell about stopped, untraced children. */
#define	WCONTINUED	4	/* Report a job control continued process. */

#if 0 /* bird: old __BSD_VISIBLE */
#define	WLINUXCLONE 0x80000000	/* Wait for kthread spawned from linux_clone. */
#endif

/*
 * Tokens for special values of the "pid" parameter to wait4.
 */
#if __BSD_VISIBLE
#define	WAIT_ANY	(-1)	/* any process */
#define	WAIT_MYPGRP	0	/* any process in my process group */
#endif /* __BSD_VISIBLE */

#ifdef _KERNEL
struct rusage;
int	kern_wait(struct thread *td, pid_t pid, int *status, int options,
	    struct rusage *rup);
#else /* !_KERNEL */
#include <sys/types.h>

__BEGIN_DECLS
pid_t	wait(int *);
pid_t	waitpid(pid_t, int *, int);
struct rusage;
pid_t	wait3(int *, int, struct rusage *);
pid_t	wait4(pid_t, int *, int, struct rusage *);


/*
 * bird: LIBC additions - start.
 */
#if __XSI_VISIBLE
#include <signal.h>

/** Wait for processes that have exited. */
#define WEXITED         8
/** Wait for processes that have stopped. Same as WUNTRACED atm. */
#define WSTOPPED       WUNTRACED
/** Keep the wait state around for later wait calls, i.e. just peek at the stuff.
 * Very logical name, not chance at all that anyone will confuse it for WNOHANG. */
#define WNOWAIT        16

/* The following values are used by the `waitid' function.  */
typedef enum
{
    /** Wait for any child process. */
    P_ALL,
    /** Wait for a specific process. */
    P_PID,
    /** Wait for processes of a process group. */
    P_PGID
} idtype_t;

int     waitid(idtype_t, id_t, siginfo_t *, int);
#endif /* __XSI_VISIBLE */

/*
 * bird: LIBC additions - end.
 */

__END_DECLS
#endif /* _KERNEL */

#endif /* !_SYS_WAIT_H_ */
