| 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 /* not quite right */ |
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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 | #ifndef _ANSI_H |
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| 38 | #include <ansi.h> |
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| 39 | #endif |
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| 40 | |
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| 41 | _PROTOTYPE( pid_t wait, (int *_stat_loc) ); |
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| 42 | _PROTOTYPE( pid_t waitpid, (pid_t _pid, int *_stat_loc, int _options) ); |
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| 43 | |
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| 44 | #endif /* _WAIT_H */ |
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