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Annotation of 43BSDTahoe/sys/h/wait.h, revision 1.1.1.1

1.1       root        1: /*
                      2:  * Copyright (c) 1982, 1986 Regents of the University of California.
                      3:  * All rights reserved.  The Berkeley software License Agreement
                      4:  * specifies the terms and conditions for redistribution.
                      5:  *
                      6:  *     @(#)wait.h      7.4 (Berkeley) 1/27/88
                      7:  */
                      8: 
                      9: /*
                     10:  * This file holds definitions relevent to the wait system call.
                     11:  * Some of the options here are available only through the ``wait3''
                     12:  * entry point; the old entry point with one argument has more fixed
                     13:  * semantics, never returning status of unstopped children, hanging until
                     14:  * a process terminates if any are outstanding, and never returns
                     15:  * detailed information about process resource utilization (<vtimes.h>).
                     16:  */
                     17: 
                     18: #ifndef BYTE_ORDER
                     19: #include <machine/endian.h>
                     20: #endif
                     21: 
                     22: /*
                     23:  * Structure of the information in the first word returned by both
                     24:  * wait and wait3.  If w_stopval==WSTOPPED, then the second structure
                     25:  * describes the information returned, else the first.  See WUNTRACED below.
                     26:  */
                     27: union wait     {
                     28:        int     w_status;               /* used in syscall */
                     29:        /*
                     30:         * Terminated process status.
                     31:         */
                     32:        struct {
                     33: #if BYTE_ORDER == LITTLE_ENDIAN 
                     34:                unsigned short  w_Termsig:7;    /* termination signal */
                     35:                unsigned short  w_Coredump:1;   /* core dump indicator */
                     36:                unsigned short  w_Retcode:8;    /* exit code if w_termsig==0 */
                     37: #endif
                     38: #if BYTE_ORDER == BIG_ENDIAN 
                     39:                unsigned short  w_Filler;       /* upper bits filler */
                     40:                unsigned char   w_Retcode;      /* exit code if w_termsig==0 */
                     41:                unsigned char   w_Coredump:1;   /* core dump indicator */
                     42:                unsigned char   w_Termsig:7;    /* termination signal */
                     43: #endif
                     44:        } w_T;
                     45:        /*
                     46:         * Stopped process status.  Returned
                     47:         * only for traced children unless requested
                     48:         * with the WUNTRACED option bit.
                     49:         */
                     50:        struct {
                     51: #if BYTE_ORDER == LITTLE_ENDIAN 
                     52:                unsigned short  w_Stopval:8;    /* == W_STOPPED if stopped */
                     53:                unsigned short  w_Stopsig:8;    /* signal that stopped us */
                     54: #else
                     55:                unsigned short  w_Filler;       /* upper bits filler */
                     56:                unsigned char   w_Stopsig;      /* signal that stopped us */
                     57:                unsigned char   w_Stopval;      /* == W_STOPPED if stopped */
                     58: #endif
                     59:        } w_S;
                     60: };
                     61: #define        w_termsig       w_T.w_Termsig
                     62: #define w_coredump     w_T.w_Coredump
                     63: #define w_retcode      w_T.w_Retcode
                     64: #define w_stopval      w_S.w_Stopval
                     65: #define w_stopsig      w_S.w_Stopsig
                     66: 
                     67: 
                     68: #define        WSTOPPED        0177    /* value of s.stopval if process is stopped */
                     69: 
                     70: /*
                     71:  * Option bits for the second argument of wait3.  WNOHANG causes the
                     72:  * wait to not hang if there are no stopped or terminated processes, rather
                     73:  * returning an error indication in this case (pid==0).  WUNTRACED
                     74:  * indicates that the caller should receive status about untraced children
                     75:  * which stop due to signals.  If children are stopped and a wait without
                     76:  * this option is done, it is as though they were still running... nothing
                     77:  * about them is returned.
                     78:  */
                     79: #define WNOHANG                1       /* dont hang in wait */
                     80: #define WUNTRACED      2       /* tell about stopped, untraced children */
                     81: 
                     82: #define WIFSTOPPED(x)  ((x).w_stopval == WSTOPPED)
                     83: #define WIFSIGNALED(x) ((x).w_stopval != WSTOPPED && (x).w_termsig != 0)
                     84: #define WIFEXITED(x)   ((x).w_stopval != WSTOPPED && (x).w_termsig == 0)

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