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Annotation of researchv9/sys/h/wait.h, revision 1.1

1.1     ! root        1: /*
        !             2:  * This file holds definitions relevent to the wait system call.
        !             3:  * Some of the options here are available only through the ``wait3''
        !             4:  * entry point; the old entry point with one argument has more fixed
        !             5:  * semantics, never returning status of unstopped children, hanging until
        !             6:  * a process terminates if any are outstanding, and never returns
        !             7:  * detailed information about process resource utilization (<vtimes.h>).
        !             8:  */
        !             9: 
        !            10: /*
        !            11:  * Structure of the information in the first word returned by both
        !            12:  * wait and wait3.  If w_stopval==WSTOPPED, then the second structure
        !            13:  * describes the information returned, else the first.  See WUNTRACED below.
        !            14:  */
        !            15: union wait     {
        !            16:        int     w_status;               /* used in syscall */
        !            17:        /*
        !            18:         * Terminated process status.
        !            19:         */
        !            20:        struct {
        !            21:                unsigned int    w_Termsig:7;    /* termination signal */
        !            22:                unsigned int    w_Coredump:1;   /* core dump indicator */
        !            23:                unsigned int    w_Retcode:8;    /* exit code if w_termsig==0 */
        !            24:        } w_T;
        !            25:        /*
        !            26:         * Stopped process status.  Returned
        !            27:         * only for traced children unless requested
        !            28:         * with the WUNTRACED option bit.
        !            29:         */
        !            30:        struct {
        !            31:                unsigned int    w_Stopval:8;    /* == W_STOPPED if stopped */
        !            32:                unsigned int    w_Stopsig:8;    /* signal that stopped us */
        !            33:        } w_S;
        !            34: };
        !            35: #define        w_termsig       w_T.w_Termsig
        !            36: #define w_coredump     w_T.w_Coredump
        !            37: #define w_retcode      w_T.w_Retcode
        !            38: #define w_stopval      w_S.w_Stopval
        !            39: #define w_stopsig      w_S.w_Stopsig
        !            40: 
        !            41: 
        !            42: #define        WSTOPPED        0177    /* value of s.stopval if process is stopped */
        !            43: 
        !            44: /*
        !            45:  * Option bits for the second argument of wait3.  WNOHANG causes the
        !            46:  * wait to not hang if there are no stopped or terminated processes, rather
        !            47:  * returning an error indication in this case (pid==0).  WUNTRACED
        !            48:  * indicates that the caller should receive status about untraced children
        !            49:  * which stop due to signals.  If children are stopped and a wait without
        !            50:  * this option is done, it is as though they were still running... nothing
        !            51:  * about them is returned.
        !            52:  */
        !            53: #define WNOHANG                1       /* dont hang in wait */
        !            54: #define WUNTRACED      2       /* tell about stopped, untraced children */
        !            55: #define        WRETLIM         4       /* internal flag */
        !            56: 
        !            57: #define WIFSTOPPED(x)  ((x).w_stopval == WSTOPPED)
        !            58: #define WIFSIGNALED(x) ((x).w_stopval != WSTOPPED && (x).w_termsig != 0)
        !            59: #define WIFEXITED(x)   ((x).w_stopval != WSTOPPED && (x).w_termsig == 0)

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