aboutsummaryrefslogtreecommitdiff
path: root/sys/sys/wait.h
blob: c854e149d3c68bb613d3834bcb54c82d70e79353 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
/*
 * 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.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 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
 * $FreeBSD$
 */

#ifndef _SYS_WAIT_H_
#define _SYS_WAIT_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.
 */
#ifdef _POSIX_SOURCE
#define	_W_INT(i)	(i)
#else
#define	_W_INT(w)	(*(int *)&(w))	/* convert union wait to int */
#define	WCOREFLAG	0200
#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) != _WSTOPPED && _WSTATUS(x) != 0)
#define WTERMSIG(x)	(_WSTATUS(x))
#define WIFEXITED(x)	(_WSTATUS(x) == 0)
#define WEXITSTATUS(x)	(_W_INT(x) >> 8)
#ifndef _POSIX_SOURCE
#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 WLINUXCLONE     0x80000000       /* wait for kthread spawned from linux_clone */

#ifndef _POSIX_SOURCE
/* POSIX extensions and 4.2/4.3 compatibility: */

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

#include <machine/endian.h>

/*
 * Deprecated:
 * Structure of the information in the status word returned by wait4.
 * If w_stopval==WSTOPPED, then the second structure describes
 * the information returned, else the first.
 */
union wait {
	int	w_status;		/* used in syscall */
	/*
	 * Terminated process status.
	 */
	struct {
#if BYTE_ORDER == LITTLE_ENDIAN
		unsigned int	w_Termsig:7,	/* termination signal */
				w_Coredump:1,	/* core dump indicator */
				w_Retcode:8,	/* exit code if w_termsig==0 */
				w_Filler:16;	/* upper bits filler */
#endif
#if BYTE_ORDER == BIG_ENDIAN
		unsigned int	w_Filler:16,	/* upper bits filler */
				w_Retcode:8,	/* exit code if w_termsig==0 */
				w_Coredump:1,	/* core dump indicator */
				w_Termsig:7;	/* termination signal */
#endif
	} w_T;
	/*
	 * Stopped process status.  Returned
	 * only for traced children unless requested
	 * with the WUNTRACED option bit.
	 */
	struct {
#if BYTE_ORDER == LITTLE_ENDIAN
		unsigned int	w_Stopval:8,	/* == W_STOPPED if stopped */
				w_Stopsig:8,	/* signal that stopped us */
				w_Filler:16;	/* upper bits filler */
#endif
#if BYTE_ORDER == BIG_ENDIAN
		unsigned int	w_Filler:16,	/* upper bits filler */
				w_Stopsig:8,	/* signal that stopped us */
				w_Stopval:8;	/* == W_STOPPED if stopped */
#endif
	} w_S;
};
#define	w_termsig	w_T.w_Termsig
#define w_coredump	w_T.w_Coredump
#define w_retcode	w_T.w_Retcode
#define w_stopval	w_S.w_Stopval
#define w_stopsig	w_S.w_Stopsig

#define	WSTOPPED	_WSTOPPED
#endif /* _POSIX_SOURCE */

#ifndef KERNEL
#include <sys/types.h>
#include <sys/cdefs.h>

__BEGIN_DECLS
struct rusage;	/* forward declaration */

pid_t	wait __P((int *));
pid_t	waitpid __P((pid_t, int *, int));
#ifndef _POSIX_SOURCE
pid_t	wait3 __P((int *, int, struct rusage *));
pid_t	wait4 __P((pid_t, int *, int, struct rusage *));
#endif
__END_DECLS
#endif

#endif