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1 | /* |
2 | * Copyright (c) 1982, 1986, 1989 The Regents of the University of California. | |
3 | * 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 7.17 (Berkeley) 6/19/91 | |
34 | */ | |
35 | ||
36 | /* | |
37 | * This file holds definitions relevent to the wait4 system call | |
38 | * and the alternate interfaces that use it (wait, wait3, waitpid). | |
39 | */ | |
40 | ||
41 | /* | |
42 | * Macros to test the exit status returned by wait | |
43 | * and extract the relevant values. | |
44 | */ | |
45 | #ifdef _POSIX_SOURCE | |
46 | #define _W_INT(i) (i) | |
47 | #else | |
48 | #define _W_INT(w) (*(int *)&(w)) /* convert union wait to int */ | |
49 | #define WCOREFLAG 0200 | |
50 | #endif | |
51 | ||
52 | #define _WSTATUS(x) (_W_INT(x) & 0177) | |
53 | #define _WSTOPPED 0177 /* _WSTATUS if process is stopped */ | |
54 | #define WIFSTOPPED(x) (_WSTATUS(x) == _WSTOPPED) | |
55 | #define WSTOPSIG(x) (_W_INT(x) >> 8) | |
56 | #define WIFSIGNALED(x) (_WSTATUS(x) != _WSTOPPED && _WSTATUS(x) != 0) | |
57 | #define WTERMSIG(x) (_WSTATUS(x)) | |
58 | #define WIFEXITED(x) (_WSTATUS(x) == 0) | |
59 | #define WEXITSTATUS(x) (_W_INT(x) >> 8) | |
60 | #ifndef _POSIX_SOURCE | |
61 | #define WCOREDUMP(x) (_W_INT(x) & WCOREFLAG) | |
62 | ||
63 | #define W_EXITCODE(ret, sig) ((ret) << 8 | (sig)) | |
64 | #define W_STOPCODE(sig) ((sig) << 8 | _WSTOPPED) | |
65 | #endif | |
66 | ||
67 | /* | |
68 | * Option bits for the second argument of wait4. WNOHANG causes the | |
69 | * wait to not hang if there are no stopped or terminated processes, rather | |
70 | * returning an error indication in this case (pid==0). WUNTRACED | |
71 | * indicates that the caller should receive status about untraced children | |
72 | * which stop due to signals. If children are stopped and a wait without | |
73 | * this option is done, it is as though they were still running... nothing | |
74 | * about them is returned. | |
75 | */ | |
76 | #define WNOHANG 1 /* dont hang in wait */ | |
77 | #define WUNTRACED 2 /* tell about stopped, untraced children */ | |
78 | ||
79 | #ifndef _POSIX_SOURCE | |
80 | /* POSIX extensions and 4.2/4.3 compatability: */ | |
81 | ||
82 | /* | |
83 | * Tokens for special values of the "pid" parameter to wait4. | |
84 | */ | |
85 | #define WAIT_ANY (-1) /* any process */ | |
86 | #define WAIT_MYPGRP 0 /* any process in my process group */ | |
87 | ||
88 | #ifndef BYTE_ORDER | |
89 | #include <machine/endian.h> | |
90 | #endif | |
91 | ||
92 | /* | |
93 | * Deprecated: | |
94 | * Structure of the information in the status word returned by wait4. | |
95 | * If w_stopval==WSTOPPED, then the second structure describes | |
96 | * the information returned, else the first. | |
97 | */ | |
98 | union wait { | |
99 | int w_status; /* used in syscall */ | |
100 | /* | |
101 | * Terminated process status. | |
102 | */ | |
103 | struct { | |
104 | #if BYTE_ORDER == LITTLE_ENDIAN | |
105 | unsigned int w_Termsig:7, /* termination signal */ | |
106 | w_Coredump:1, /* core dump indicator */ | |
107 | w_Retcode:8, /* exit code if w_termsig==0 */ | |
108 | w_Filler:16; /* upper bits filler */ | |
109 | #endif | |
110 | #if BYTE_ORDER == BIG_ENDIAN | |
111 | unsigned int w_Filler:16, /* upper bits filler */ | |
112 | w_Retcode:8, /* exit code if w_termsig==0 */ | |
113 | w_Coredump:1, /* core dump indicator */ | |
114 | w_Termsig:7; /* termination signal */ | |
115 | #endif | |
116 | } w_T; | |
117 | /* | |
118 | * Stopped process status. Returned | |
119 | * only for traced children unless requested | |
120 | * with the WUNTRACED option bit. | |
121 | */ | |
122 | struct { | |
123 | #if BYTE_ORDER == LITTLE_ENDIAN | |
124 | unsigned int w_Stopval:8, /* == W_STOPPED if stopped */ | |
125 | w_Stopsig:8, /* signal that stopped us */ | |
126 | w_Filler:16; /* upper bits filler */ | |
127 | #endif | |
128 | #if BYTE_ORDER == BIG_ENDIAN | |
129 | unsigned int w_Filler:16, /* upper bits filler */ | |
130 | w_Stopsig:8, /* signal that stopped us */ | |
131 | w_Stopval:8; /* == W_STOPPED if stopped */ | |
132 | #endif | |
133 | } w_S; | |
134 | }; | |
135 | #define w_termsig w_T.w_Termsig | |
136 | #define w_coredump w_T.w_Coredump | |
137 | #define w_retcode w_T.w_Retcode | |
138 | #define w_stopval w_S.w_Stopval | |
139 | #define w_stopsig w_S.w_Stopsig | |
140 | ||
141 | #define WSTOPPED _WSTOPPED | |
142 | #endif /* _POSIX_SOURCE */ | |
143 | ||
144 | #ifndef KERNEL | |
145 | #include <sys/types.h> | |
146 | #include <sys/cdefs.h> | |
147 | ||
148 | __BEGIN_DECLS | |
149 | struct rusage; /* forward declaration */ | |
150 | ||
151 | pid_t wait __P((int *)); | |
152 | pid_t waitpid __P((pid_t, int *, int)); | |
153 | #ifndef _POSIX_SOURCE | |
154 | pid_t wait3 __P((int *, int, struct rusage *)); | |
155 | pid_t wait4 __P((pid_t, int *, int, struct rusage *)); | |
156 | #endif | |
157 | __END_DECLS | |
158 | #endif |