| [4] | 1 | /* The <sys/wait.h> header contains macros related to wait(). The value
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| 2 | * returned by wait() and waitpid() depends on whether the process
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| 3 | * terminated by an exit() call, was killed by a signal, or was stopped
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| 4 | * due to job control, as follows:
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| 5 | *
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| 6 | * High byte Low byte
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| 7 | * +---------------------+
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| 8 | * exit(status) | status | 0 |
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| 9 | * +---------------------+
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| 10 | * killed by signal | 0 | signal |
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| 11 | * +---------------------+
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| 12 | * stopped (job control) | signal | 0177 |
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| 13 | * +---------------------+
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| 14 | */
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| 15 |
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| 16 | #ifndef _WAIT_H
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| 17 | #define _WAIT_H
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| 18 |
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| 19 | #ifndef _TYPES_H
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| 20 | #include <sys/types.h>
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| 21 | #endif
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| 22 |
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| 23 | #define _LOW(v) ( (v) & 0377)
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| 24 | #define _HIGH(v) ( ((v) >> 8) & 0377)
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| 25 |
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| 26 | #define WNOHANG 1 /* do not wait for child to exit */
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| 27 | #define WUNTRACED 2 /* for job control; not implemented */
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| 28 |
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| 29 | #define WIFEXITED(s) (_LOW(s) == 0) /* normal exit */
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| 30 | #define WEXITSTATUS(s) (_HIGH(s)) /* exit status */
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| 31 | #define WTERMSIG(s) (_LOW(s) & 0177) /* sig value */
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| 32 | #define WIFSIGNALED(s) (((unsigned int)(s)-1 & 0xFFFF) < 0xFF) /* signaled */
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| 33 | #define WIFSTOPPED(s) (_LOW(s) == 0177) /* stopped */
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| 34 | #define WSTOPSIG(s) (_HIGH(s) & 0377) /* stop signal */
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| 35 |
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| 36 | /* Function Prototypes. */
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| 37 | _PROTOTYPE( pid_t wait, (int *_stat_loc) );
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| 38 | _PROTOTYPE( pid_t waitpid, (pid_t _pid, int *_stat_loc, int _options) );
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| 39 |
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| 40 | #endif /* _WAIT_H */
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