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Annotation of Net2/sys/wait.h, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1982, 1986, 1989 The Regents of the University of California.
        !             3:  * All rights reserved.
        !             4:  *
        !             5:  * Redistribution and use in source and binary forms, with or without
        !             6:  * modification, are permitted provided that the following conditions
        !             7:  * are met:
        !             8:  * 1. Redistributions of source code must retain the above copyright
        !             9:  *    notice, this list of conditions and the following disclaimer.
        !            10:  * 2. Redistributions in binary form must reproduce the above copyright
        !            11:  *    notice, this list of conditions and the following disclaimer in the
        !            12:  *    documentation and/or other materials provided with the distribution.
        !            13:  * 3. All advertising materials mentioning features or use of this software
        !            14:  *    must display the following acknowledgement:
        !            15:  *     This product includes software developed by the University of
        !            16:  *     California, Berkeley and its contributors.
        !            17:  * 4. Neither the name of the University nor the names of its contributors
        !            18:  *    may be used to endorse or promote products derived from this software
        !            19:  *    without specific prior written permission.
        !            20:  *
        !            21:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            22:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            23:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            24:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            25:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            26:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            27:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            28:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            29:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            30:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            31:  * SUCH DAMAGE.
        !            32:  *
        !            33:  *     @(#)wait.h      7.17 (Berkeley) 6/19/91
        !            34:  */
        !            35: 
        !            36: /*
        !            37:  * This file holds definitions relevent to the wait4 system call
        !            38:  * and the alternate interfaces that use it (wait, wait3, waitpid).
        !            39:  */
        !            40: 
        !            41: /*
        !            42:  * Macros to test the exit status returned by wait
        !            43:  * and extract the relevant values.
        !            44:  */
        !            45: #ifdef _POSIX_SOURCE
        !            46: #define        _W_INT(i)       (i)
        !            47: #else
        !            48: #define        _W_INT(w)       (*(int *)&(w))  /* convert union wait to int */
        !            49: #define        WCOREFLAG       0200
        !            50: #endif
        !            51: 
        !            52: #define        _WSTATUS(x)     (_W_INT(x) & 0177)
        !            53: #define        _WSTOPPED       0177            /* _WSTATUS if process is stopped */
        !            54: #define WIFSTOPPED(x)  (_WSTATUS(x) == _WSTOPPED)
        !            55: #define WSTOPSIG(x)    (_W_INT(x) >> 8)
        !            56: #define WIFSIGNALED(x) (_WSTATUS(x) != _WSTOPPED && _WSTATUS(x) != 0)
        !            57: #define WTERMSIG(x)    (_WSTATUS(x))
        !            58: #define WIFEXITED(x)   (_WSTATUS(x) == 0)
        !            59: #define WEXITSTATUS(x) (_W_INT(x) >> 8)
        !            60: #ifndef _POSIX_SOURCE
        !            61: #define WCOREDUMP(x)   (_W_INT(x) & WCOREFLAG)
        !            62: 
        !            63: #define        W_EXITCODE(ret, sig)    ((ret) << 8 | (sig))
        !            64: #define        W_STOPCODE(sig)         ((sig) << 8 | _WSTOPPED)
        !            65: #endif
        !            66: 
        !            67: /*
        !            68:  * Option bits for the second argument of wait4.  WNOHANG causes the
        !            69:  * wait to not hang if there are no stopped or terminated processes, rather
        !            70:  * returning an error indication in this case (pid==0).  WUNTRACED
        !            71:  * indicates that the caller should receive status about untraced children
        !            72:  * which stop due to signals.  If children are stopped and a wait without
        !            73:  * this option is done, it is as though they were still running... nothing
        !            74:  * about them is returned.
        !            75:  */
        !            76: #define WNOHANG                1       /* dont hang in wait */
        !            77: #define WUNTRACED      2       /* tell about stopped, untraced children */
        !            78: 
        !            79: #ifndef _POSIX_SOURCE
        !            80: /* POSIX extensions and 4.2/4.3 compatability: */
        !            81: 
        !            82: /*
        !            83:  * Tokens for special values of the "pid" parameter to wait4.
        !            84:  */
        !            85: #define        WAIT_ANY        (-1)    /* any process */
        !            86: #define        WAIT_MYPGRP     0       /* any process in my process group */
        !            87: 
        !            88: #ifndef BYTE_ORDER
        !            89: #include <machine/endian.h>
        !            90: #endif
        !            91: 
        !            92: /*
        !            93:  * Deprecated:
        !            94:  * Structure of the information in the status word returned by wait4.
        !            95:  * If w_stopval==WSTOPPED, then the second structure describes
        !            96:  * the information returned, else the first.
        !            97:  */
        !            98: union wait {
        !            99:        int     w_status;               /* used in syscall */
        !           100:        /*
        !           101:         * Terminated process status.
        !           102:         */
        !           103:        struct {
        !           104: #if BYTE_ORDER == LITTLE_ENDIAN 
        !           105:                unsigned int    w_Termsig:7,    /* termination signal */
        !           106:                                w_Coredump:1,   /* core dump indicator */
        !           107:                                w_Retcode:8,    /* exit code if w_termsig==0 */
        !           108:                                w_Filler:16;    /* upper bits filler */
        !           109: #endif
        !           110: #if BYTE_ORDER == BIG_ENDIAN 
        !           111:                unsigned int    w_Filler:16,    /* upper bits filler */
        !           112:                                w_Retcode:8,    /* exit code if w_termsig==0 */
        !           113:                                w_Coredump:1,   /* core dump indicator */
        !           114:                                w_Termsig:7;    /* termination signal */
        !           115: #endif
        !           116:        } w_T;
        !           117:        /*
        !           118:         * Stopped process status.  Returned
        !           119:         * only for traced children unless requested
        !           120:         * with the WUNTRACED option bit.
        !           121:         */
        !           122:        struct {
        !           123: #if BYTE_ORDER == LITTLE_ENDIAN 
        !           124:                unsigned int    w_Stopval:8,    /* == W_STOPPED if stopped */
        !           125:                                w_Stopsig:8,    /* signal that stopped us */
        !           126:                                w_Filler:16;    /* upper bits filler */
        !           127: #endif
        !           128: #if BYTE_ORDER == BIG_ENDIAN 
        !           129:                unsigned int    w_Filler:16,    /* upper bits filler */
        !           130:                                w_Stopsig:8,    /* signal that stopped us */
        !           131:                                w_Stopval:8;    /* == W_STOPPED if stopped */
        !           132: #endif
        !           133:        } w_S;
        !           134: };
        !           135: #define        w_termsig       w_T.w_Termsig
        !           136: #define w_coredump     w_T.w_Coredump
        !           137: #define w_retcode      w_T.w_Retcode
        !           138: #define w_stopval      w_S.w_Stopval
        !           139: #define w_stopsig      w_S.w_Stopsig
        !           140: 
        !           141: #define        WSTOPPED        _WSTOPPED
        !           142: #endif /* _POSIX_SOURCE */
        !           143: 
        !           144: #ifndef KERNEL
        !           145: #include <sys/types.h>
        !           146: #include <sys/cdefs.h>
        !           147: 
        !           148: __BEGIN_DECLS
        !           149: struct rusage; /* forward declaration */
        !           150: 
        !           151: pid_t  wait __P((int *));
        !           152: pid_t  waitpid __P((pid_t, int *, int));
        !           153: #ifndef _POSIX_SOURCE
        !           154: pid_t  wait3 __P((int *, int, struct rusage *));
        !           155: pid_t  wait4 __P((pid_t, int *, int, struct rusage *));
        !           156: #endif
        !           157: __END_DECLS
        !           158: #endif

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