28 lines
1.1 KiB
C
28 lines
1.1 KiB
C
/* Define how to access the int that the wait system call stores.
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This has been compatible in all Unix systems since time immemorial,
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but various well-meaning people have defined various different
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words for the same old bits in the same old int (sometimes claimed
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to be a struct). We just know it's an int and we use these macros
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to access the bits. */
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/* The following macros are defined equivalently to their definitions
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in POSIX.1. We fail to define WNOHANG and WUNTRACED, which POSIX.1
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<sys/wait.h> defines, since our code does not use waitpid(). We
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also fail to declare wait() and waitpid(). */
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#define WIFEXITED(w) (((w)&0377) == 0)
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#define WIFSIGNALED(w) (((w)&0377) != 0177 && ((w)&~0377) == 0)
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#define WIFSTOPPED(w) (((w)&0377) == 0177)
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#define WEXITSTATUS(w) ((w) >> 8) /* same as WRETCODE */
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#define WTERMSIG(w) ((w) & 0177)
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#define WSTOPSIG(w) ((w) >> 8)
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/* These are not defined in POSIX, but are used by our programs. */
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#define WAITTYPE int
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#define WCOREDUMP(w) (((w)&0200) != 0)
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#define WSETEXIT(w,status) ((w) = (0 | ((status) << 8)))
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#define WSETSTOP(w,sig) ((w) = (0177 | ((sig) << 8)))
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