FreeBSD/Linux Kernel Cross Reference
sys/sys/wait.h
1 /* $NetBSD: wait.h,v 1.23 2005/02/26 22:25:34 perry Exp $ */
2
3 /*
4 * Copyright (c) 1982, 1986, 1989, 1993, 1994
5 * The Regents of the University of California. All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 *
31 * @(#)wait.h 8.2 (Berkeley) 7/10/94
32 */
33
34 #ifndef _SYS_WAIT_H_
35 #define _SYS_WAIT_H_
36
37 #include <sys/featuretest.h>
38
39 /*
40 * This file holds definitions relevent to the wait4 system call
41 * and the alternate interfaces that use it (wait, wait3, waitpid).
42 */
43
44 /*
45 * Macros to test the exit status returned by wait
46 * and extract the relevant values.
47 */
48 #if !( defined(_XOPEN_SOURCE) || defined(_NETBSD_SOURCE) ) || defined(_KERNEL)
49 #define _W_INT(i) (i)
50 #else
51 #define _W_INT(w) (*(int *)(void *)&(w)) /* convert union wait to int */
52 #endif
53
54 #define _WSTATUS(x) (_W_INT(x) & 0177)
55 #define _WSTOPPED 0177 /* _WSTATUS if process is stopped */
56 #define WIFSTOPPED(x) (_WSTATUS(x) == _WSTOPPED)
57 #define WSTOPSIG(x) ((int)(((unsigned int)_W_INT(x)) >> 8) & 0xff)
58 #define WIFSIGNALED(x) (_WSTATUS(x) != _WSTOPPED && _WSTATUS(x) != 0)
59 #define WTERMSIG(x) (_WSTATUS(x))
60 #define WIFEXITED(x) (_WSTATUS(x) == 0)
61 #define WEXITSTATUS(x) ((int)(((unsigned int)_W_INT(x)) >> 8) & 0xff)
62 #if defined(_XOPEN_SOURCE) || defined(_NETBSD_SOURCE) || defined(_KERNEL)
63 #define WCOREFLAG 0200
64 #define WCOREDUMP(x) (_W_INT(x) & WCOREFLAG)
65
66 #define W_EXITCODE(ret, sig) ((ret) << 8 | (sig))
67 #define W_STOPCODE(sig) ((sig) << 8 | _WSTOPPED)
68 #endif
69
70 /*
71 * Option bits for the third argument of wait4. WNOHANG causes the
72 * wait to not hang if there are no stopped or terminated processes, rather
73 * returning an error indication in this case (pid==0). WUNTRACED
74 * indicates that the caller should receive status about untraced children
75 * which stop due to signals. If children are stopped and a wait without
76 * this option is done, it is as though they were still running... nothing
77 * about them is returned.
78 */
79 #define WNOHANG 0x00000001 /* don't hang in wait */
80 #define WUNTRACED 0x00000002 /* tell about stopped,
81 untraced children */
82 #if defined(_XOPEN_SOURCE) || defined(_NETBSD_SOURCE)
83 #define WALTSIG 0x00000004 /* wait for processes that exit
84 with an alternate signal (i.e.
85 not SIGCHLD) */
86 #define WALLSIG 0x00000008 /* wait for processes that exit
87 with any signal, i.e. SIGCHLD
88 and alternates */
89
90 /*
91 * These are the Linux names of some of the above flags, for compatibility
92 * with Linux's clone(2) API.
93 */
94 #define __WCLONE WALTSIG
95 #define __WALL WALLSIG
96
97 /*
98 * These bits are used in order to support SVR4 (etc) functionality
99 * without replicating sys_wait4 5 times.
100 */
101 #define WNOWAIT 0x00010000 /* Don't mark child 'P_WAITED' */
102 #define WNOZOMBIE 0x00020000 /* Ignore zombies */
103 #endif /* _XOPEN_SOURCE || _NETBSD_SOURCE */
104
105 #if defined(_XOPEN_SOURCE) || defined(_NETBSD_SOURCE)
106 /* POSIX extensions and 4.2/4.3 compatibility: */
107
108 /*
109 * Tokens for special values of the "pid" parameter to wait4.
110 */
111 #define WAIT_ANY (-1) /* any process */
112 #define WAIT_MYPGRP 0 /* any process in my process group */
113
114 #include <sys/types.h>
115
116 /*
117 * Deprecated:
118 * Structure of the information in the status word returned by wait4.
119 * If w_stopval==WSTOPPED, then the second structure describes
120 * the information returned, else the first.
121 */
122 union wait {
123 int w_status; /* used in syscall */
124 /*
125 * Terminated process status.
126 */
127 struct {
128 #if BYTE_ORDER == LITTLE_ENDIAN
129 unsigned int w_Termsig:7, /* termination signal */
130 w_Coredump:1, /* core dump indicator */
131 w_Retcode:8, /* exit code if w_termsig==0 */
132 w_Filler:16; /* upper bits filler */
133 #endif
134 #if BYTE_ORDER == BIG_ENDIAN
135 unsigned int w_Filler:16, /* upper bits filler */
136 w_Retcode:8, /* exit code if w_termsig==0 */
137 w_Coredump:1, /* core dump indicator */
138 w_Termsig:7; /* termination signal */
139 #endif
140 } w_T;
141 /*
142 * Stopped process status. Returned
143 * only for traced children unless requested
144 * with the WUNTRACED option bit.
145 */
146 struct {
147 #if BYTE_ORDER == LITTLE_ENDIAN
148 unsigned int w_Stopval:8, /* == W_STOPPED if stopped */
149 w_Stopsig:8, /* signal that stopped us */
150 w_Filler:16; /* upper bits filler */
151 #endif
152 #if BYTE_ORDER == BIG_ENDIAN
153 unsigned int w_Filler:16, /* upper bits filler */
154 w_Stopsig:8, /* signal that stopped us */
155 w_Stopval:8; /* == W_STOPPED if stopped */
156 #endif
157 } w_S;
158 };
159 #define w_termsig w_T.w_Termsig
160 #define w_coredump w_T.w_Coredump
161 #define w_retcode w_T.w_Retcode
162 #define w_stopval w_S.w_Stopval
163 #define w_stopsig w_S.w_Stopsig
164
165 #define WSTOPPED _WSTOPPED
166 #endif /* _XOPEN_SOURCE || _NETBSD_SOURCE */
167
168 #ifndef _KERNEL
169 #include <sys/cdefs.h>
170
171 __BEGIN_DECLS
172 struct rusage; /* forward declaration */
173
174 pid_t wait(int *);
175 pid_t waitpid(pid_t, int *, int);
176 #if defined(_XOPEN_SOURCE) || defined(_NETBSD_SOURCE)
177 pid_t wait3(int *, int, struct rusage *);
178 pid_t wait4(pid_t, int *, int, struct rusage *);
179 #endif
180 __END_DECLS
181 #endif
182
183 #endif /* !_SYS_WAIT_H_ */
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