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29 * @(#)wait.h 8.2 (Berkeley) 7/10/94
36 #include <sys/cdefs.h>
39 * This file holds definitions relevant to the wait4 system call and the
40 * alternate interfaces that use it (wait, wait3, waitpid).
44 * Macros to test the exit status returned by wait and extract the relevant
48 #define WCOREFLAG 0200
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 #define WIFCONTINUED(x) (x == 0x13) /* 0x13 == SIGCONT */
62 #define WCOREDUMP(x) (_W_INT(x) & WCOREFLAG)
64 #define W_EXITCODE(ret, sig) ((ret) << 8 | (sig))
65 #define W_STOPCODE(sig) ((sig) << 8 | _WSTOPPED)
69 * Option bits for the third argument of wait4. WNOHANG causes the
70 * wait to not hang if there are no stopped or terminated processes, rather
71 * returning an error indication in this case (pid==0). WUNTRACED
72 * indicates that the caller should receive status about untraced children
73 * which stop due to signals. If children are stopped and a wait without
74 * this option is done, it is as though they were still running... nothing
75 * about them is returned. WNOWAIT only request information about zombie,
76 * leaving the proc around, available for later waits.
78 #define WNOHANG 1 /* Don't hang in wait. */
79 #define WUNTRACED 2 /* Tell about stopped, untraced children. */
80 #define WSTOPPED WUNTRACED /* SUS compatibility */
81 #define WCONTINUED 4 /* Report a job control continued process. */
82 #define WNOWAIT 8 /* Poll only. Don't delete the proc entry. */
85 #define WLINUXCLONE 0x80000000 /* Wait for kthread spawned from linux_clone. */
89 * 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 */
94 #endif /* __BSD_VISIBLE */
97 #include <sys/types.h>
101 pid_t waitpid(pid_t, int *, int);
104 pid_t wait3(int *, int, struct rusage *);
105 pid_t wait4(pid_t, int *, int, struct rusage *);
108 #endif /* !_KERNEL */
110 #endif /* !_SYS_WAIT_H_ */