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33 * @(#)wait.h 8.2 (Berkeley) 7/10/94
34 * $FreeBSD: src/sys/sys/wait.h,v 1.11 1999/12/29 04:24:50 peter Exp $
41 * This file holds definitions relevant to the wait4 system call
42 * and the alternate interfaces that use it (wait, wait3, waitpid).
46 * Macros to test the exit status returned by wait
47 * and extract the relevant values.
52 #define _W_INT(w) (*(int *)&(w)) /* convert union wait to int */
53 #define WCOREFLAG 0200
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 #define WIFCONTINUED(x) (x == 19) /* 19 == SIGCONT */
66 #define WCOREDUMP(x) (_W_INT(x) & WCOREFLAG)
68 #define W_EXITCODE(ret, sig) ((ret) << 8 | (sig))
69 #define W_STOPCODE(sig) ((sig) << 8 | _WSTOPPED)
73 * Option bits for the third argument of wait4. WNOHANG causes the
74 * wait to not hang if there are no stopped or terminated processes, rather
75 * returning an error indication in this case (pid==0). WUNTRACED
76 * indicates that the caller should receive status about untraced children
77 * which stop due to signals. If children are stopped and a wait without
78 * this option is done, it is as though they were still running... nothing
79 * about them is returned.
81 #define WNOHANG 1 /* don't hang in wait */
82 #define WUNTRACED 2 /* tell about stopped, untraced children */
83 #define WCONTINUED 4 /* Report a job control continued process. */
84 #define WLINUXCLONE 0x80000000 /* wait for kthread spawned from linux_clone */
87 /* POSIX extensions and 4.2/4.3 compatibility: */
90 * Tokens for special values of the "pid" parameter to wait4.
92 #define WAIT_ANY (-1) /* any process */
93 #define WAIT_MYPGRP 0 /* any process in my process group */
95 #include <machine/endian.h>
99 * Structure of the information in the status word returned by wait4.
100 * If w_stopval==WSTOPPED, then the second structure describes
101 * the information returned, else the first.
104 int w_status; /* used in syscall */
106 * Terminated process status.
109 #if _BYTE_ORDER == _LITTLE_ENDIAN
110 unsigned int w_Termsig:7, /* termination signal */
111 w_Coredump:1, /* core dump indicator */
112 w_Retcode:8, /* exit code if w_termsig==0 */
113 w_Filler:16; /* upper bits filler */
114 #elif _BYTE_ORDER == _BIG_ENDIAN
115 unsigned int w_Filler:16, /* upper bits filler */
116 w_Retcode:8, /* exit code if w_termsig==0 */
117 w_Coredump:1, /* core dump indicator */
118 w_Termsig:7; /* termination signal */
120 #error "Byte order not implemented"
124 * Stopped process status. Returned
125 * only for traced children unless requested
126 * with the WUNTRACED option bit.
129 #if _BYTE_ORDER == _LITTLE_ENDIAN
130 unsigned int w_Stopval:8, /* == W_STOPPED if stopped */
131 w_Stopsig:8, /* signal that stopped us */
132 w_Filler:16; /* upper bits filler */
133 #elif _BYTE_ORDER == _BIG_ENDIAN
134 unsigned int w_Filler:16, /* upper bits filler */
135 w_Stopsig:8, /* signal that stopped us */
136 w_Stopval:8; /* == W_STOPPED if stopped */
138 #error "Byte order not implemented"
142 #define w_termsig w_T.w_Termsig
143 #define w_coredump w_T.w_Coredump
144 #define w_retcode w_T.w_Retcode
145 #define w_stopval w_S.w_Stopval
146 #define w_stopsig w_S.w_Stopsig
148 #define WSTOPPED _WSTOPPED
149 #endif /* _POSIX_SOURCE */
151 #if !defined(_KERNEL) || defined(_KERNEL_VIRTUAL)
152 #ifndef _SYS_TYPES_H_
153 #include <sys/types.h>
155 #ifndef _SYS_CDEFS_H_
156 #include <sys/cdefs.h>
160 struct rusage; /* forward declaration */
163 pid_t waitpid (pid_t, int *, int);
164 #ifndef _POSIX_SOURCE
165 pid_t wait3 (int *, int, struct rusage *);
166 pid_t wait4 (pid_t, int *, int, struct rusage *);