FreeBSD/Linux Kernel Cross Reference
sys/sys/wait.h
1 /*
2 * Copyright (c) 1982, 1986, 1989, 1993, 1994
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 *
33 * @(#)wait.h 8.2 (Berkeley) 7/10/94
34 * $FreeBSD$
35 */
36
37 #ifndef _SYS_WAIT_H_
38 #define _SYS_WAIT_H_
39
40 /*
41 * This file holds definitions relevant to the wait4 system call
42 * and the alternate interfaces that use it (wait, wait3, waitpid).
43 */
44
45 /*
46 * Macros to test the exit status returned by wait
47 * and extract the relevant values.
48 */
49 #ifdef _POSIX_SOURCE
50 #define _W_INT(i) (i)
51 #else
52 #define _W_INT(w) (*(int *)&(w)) /* convert union wait to int */
53 #define WCOREFLAG 0200
54 #endif
55
56 #define _WSTATUS(x) (_W_INT(x) & 0177)
57 #define _WSTOPPED 0177 /* _WSTATUS if process is stopped */
58 #define WIFSTOPPED(x) (_WSTATUS(x) == _WSTOPPED)
59 #define WSTOPSIG(x) (_W_INT(x) >> 8)
60 #define WIFSIGNALED(x) (_WSTATUS(x) != _WSTOPPED && _WSTATUS(x) != 0)
61 #define WTERMSIG(x) (_WSTATUS(x))
62 #define WIFEXITED(x) (_WSTATUS(x) == 0)
63 #define WEXITSTATUS(x) (_W_INT(x) >> 8)
64 #ifndef _POSIX_SOURCE
65 #define WCOREDUMP(x) (_W_INT(x) & WCOREFLAG)
66
67 #define W_EXITCODE(ret, sig) ((ret) << 8 | (sig))
68 #define W_STOPCODE(sig) ((sig) << 8 | _WSTOPPED)
69 #endif
70
71 /*
72 * Option bits for the third argument of wait4. WNOHANG causes the
73 * wait to not hang if there are no stopped or terminated processes, rather
74 * returning an error indication in this case (pid==0). WUNTRACED
75 * indicates that the caller should receive status about untraced children
76 * which stop due to signals. If children are stopped and a wait without
77 * this option is done, it is as though they were still running... nothing
78 * about them is returned.
79 */
80 #define WNOHANG 1 /* don't hang in wait */
81 #define WUNTRACED 2 /* tell about stopped, untraced children */
82 #define WLINUXCLONE 0x80000000 /* wait for kthread spawned from linux_clone */
83
84 #ifndef _POSIX_SOURCE
85 /* POSIX extensions and 4.2/4.3 compatibility: */
86
87 /*
88 * Tokens for special values of the "pid" parameter to wait4.
89 */
90 #define WAIT_ANY (-1) /* any process */
91 #define WAIT_MYPGRP 0 /* any process in my process group */
92
93 #include <machine/endian.h>
94
95 /*
96 * Deprecated:
97 * Structure of the information in the status word returned by wait4.
98 * If w_stopval==WSTOPPED, then the second structure describes
99 * the information returned, else the first.
100 */
101 union wait {
102 int w_status; /* used in syscall */
103 /*
104 * Terminated process status.
105 */
106 struct {
107 #if BYTE_ORDER == LITTLE_ENDIAN
108 unsigned int w_Termsig:7, /* termination signal */
109 w_Coredump:1, /* core dump indicator */
110 w_Retcode:8, /* exit code if w_termsig==0 */
111 w_Filler:16; /* upper bits filler */
112 #endif
113 #if BYTE_ORDER == BIG_ENDIAN
114 unsigned int w_Filler:16, /* upper bits filler */
115 w_Retcode:8, /* exit code if w_termsig==0 */
116 w_Coredump:1, /* core dump indicator */
117 w_Termsig:7; /* termination signal */
118 #endif
119 } w_T;
120 /*
121 * Stopped process status. Returned
122 * only for traced children unless requested
123 * with the WUNTRACED option bit.
124 */
125 struct {
126 #if BYTE_ORDER == LITTLE_ENDIAN
127 unsigned int w_Stopval:8, /* == W_STOPPED if stopped */
128 w_Stopsig:8, /* signal that stopped us */
129 w_Filler:16; /* upper bits filler */
130 #endif
131 #if BYTE_ORDER == BIG_ENDIAN
132 unsigned int w_Filler:16, /* upper bits filler */
133 w_Stopsig:8, /* signal that stopped us */
134 w_Stopval:8; /* == W_STOPPED if stopped */
135 #endif
136 } w_S;
137 };
138 #define w_termsig w_T.w_Termsig
139 #define w_coredump w_T.w_Coredump
140 #define w_retcode w_T.w_Retcode
141 #define w_stopval w_S.w_Stopval
142 #define w_stopsig w_S.w_Stopsig
143
144 #define WSTOPPED _WSTOPPED
145 #endif /* _POSIX_SOURCE */
146
147 #ifndef KERNEL
148 #include <sys/types.h>
149 #include <sys/cdefs.h>
150
151 __BEGIN_DECLS
152 struct rusage; /* forward declaration */
153
154 pid_t wait __P((int *));
155 pid_t waitpid __P((pid_t, int *, int));
156 #ifndef _POSIX_SOURCE
157 pid_t wait3 __P((int *, int, struct rusage *));
158 pid_t wait4 __P((pid_t, int *, int, struct rusage *));
159 #endif
160 __END_DECLS
161 #endif
162
163 #endif
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