40 lines
1.3 KiB
C
40 lines
1.3 KiB
C
/* 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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#ifndef _WAIT_H
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#define _WAIT_H
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#define _LOW(v) ( (v) & 0377)
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#define _HIGH(v) ( ((v) >> 8) & 0377)
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#define WNOHANG 1 /* do not wait for child to exit */
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#define WUNTRACED 2 /* for job control; not implemented */
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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 & 0xFFFF) < 0xFF) /* 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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/* Function Prototypes. */
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#ifndef _ANSI_H
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#include <ansi.h>
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#endif
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_PROTOTYPE( pid_t wait, (int *_stat_loc) );
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_PROTOTYPE( pid_t waitpid, (pid_t _pid, int *_stat_loc, int _options) );
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#endif /* _WAIT_H */
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