64 lines
2.1 KiB
C
64 lines
2.1 KiB
C
#ifndef _SYS_WAIT_H_
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#define _SYS_WAIT_H_
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#include <sys/cdefs.h>
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#include <sys/types.h>
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#include <sys/featuretest.h>
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/* The <sys/wait.h> header contains macros related to wait(). The value
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* returned by wait() and waitpid() depends on whether the process
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* terminated by an exit() call, was killed by a signal, or was stopped
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* due to job control, as follows:
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*
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* High byte Low byte
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* +---------------------+
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* exit(status) | status | 0 |
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* +---------------------+
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* killed by signal | 0 | signal |
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* +---------------------+
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* stopped (job control) | signal | 0177 |
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* +---------------------+
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*/
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/*
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* Macros to test the exit status returned by wait
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* and extract the relevant values.
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*/
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#define _LOW(v) ( (v) & 0377)
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#define _HIGH(v) ( ((v) >> 8) & 0377)
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#define WIFEXITED(s) (_LOW(s) == 0) /* normal exit */
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#define WEXITSTATUS(s) (_HIGH(s)) /* exit status */
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#define WTERMSIG(s) (_LOW(s) & 0177) /* sig value */
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#define WIFSIGNALED(s) ((((unsigned int)(s)-1) & 0xFFFFU) < 0xFFU) /* signaled */
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#define WIFSTOPPED(s) (_LOW(s) == 0177) /* stopped */
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#define WSTOPSIG(s) (_HIGH(s) & 0377) /* stop signal */
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/*
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* Option bits for the third argument of waitpid. WNOHANG causes the
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* wait to not hang if there are no stopped or terminated processes, rather
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* returning an error indication in this case (pid==0). WUNTRACED
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* indicates that the caller should receive status about untraced children
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* which stop due to signals. If children are stopped and a wait without
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* this option is done, it is as though they were still running... nothing
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* about them is returned.
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*/
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#define WNOHANG 0x00000001 /* don't hang in wait */
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#define WUNTRACED 0x00000002 /* tell about stopped,
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untraced children */
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/* POSIX extensions and 4.2/4.3 compatibility: */
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/*
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* Tokens for special values of the "pid" parameter to waitpid.
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*/
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#define WAIT_ANY (-1) /* any process */
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#define WAIT_MYPGRP 0 /* any process in my process group */
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__BEGIN_DECLS
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pid_t wait(int *);
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pid_t waitpid(pid_t, int *, int);
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__END_DECLS
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#endif /* !_SYS_WAIT_H_ */
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