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Annotation of XNU/bsd/sys/wait.h, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
        !             3:  *
        !             4:  * @APPLE_LICENSE_HEADER_START@
        !             5:  * 
        !             6:  * The contents of this file constitute Original Code as defined in and
        !             7:  * are subject to the Apple Public Source License Version 1.1 (the
        !             8:  * "License").  You may not use this file except in compliance with the
        !             9:  * License.  Please obtain a copy of the License at
        !            10:  * http://www.apple.com/publicsource and read it before using this file.
        !            11:  * 
        !            12:  * This Original Code and all software distributed under the License are
        !            13:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
        !            14:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
        !            15:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
        !            16:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
        !            17:  * License for the specific language governing rights and limitations
        !            18:  * under the License.
        !            19:  * 
        !            20:  * @APPLE_LICENSE_HEADER_END@
        !            21:  */
        !            22: /* Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved */
        !            23: /*
        !            24:  * Copyright (c) 1982, 1986, 1989, 1993, 1994
        !            25:  *     The Regents of the University of California.  All rights reserved.
        !            26:  *
        !            27:  * Redistribution and use in source and binary forms, with or without
        !            28:  * modification, are permitted provided that the following conditions
        !            29:  * are met:
        !            30:  * 1. Redistributions of source code must retain the above copyright
        !            31:  *    notice, this list of conditions and the following disclaimer.
        !            32:  * 2. Redistributions in binary form must reproduce the above copyright
        !            33:  *    notice, this list of conditions and the following disclaimer in the
        !            34:  *    documentation and/or other materials provided with the distribution.
        !            35:  * 3. All advertising materials mentioning features or use of this software
        !            36:  *    must display the following acknowledgement:
        !            37:  *     This product includes software developed by the University of
        !            38:  *     California, Berkeley and its contributors.
        !            39:  * 4. Neither the name of the University nor the names of its contributors
        !            40:  *    may be used to endorse or promote products derived from this software
        !            41:  *    without specific prior written permission.
        !            42:  *
        !            43:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            44:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            45:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            46:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            47:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            48:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            49:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            50:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            51:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            52:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            53:  * SUCH DAMAGE.
        !            54:  *
        !            55:  *     @(#)wait.h      8.2 (Berkeley) 7/10/94
        !            56:  */
        !            57:  
        !            58: #ifndef _SYS_WAIT_H_
        !            59: #define        _SYS_WAIT_H_
        !            60: 
        !            61: /*
        !            62:  * This file holds definitions relevent to the wait4 system call
        !            63:  * and the alternate interfaces that use it (wait, wait3, waitpid).
        !            64:  */
        !            65: 
        !            66: /*
        !            67:  * Macros to test the exit status returned by wait
        !            68:  * and extract the relevant values.
        !            69:  */
        !            70: #ifdef _POSIX_SOURCE
        !            71: #define        _W_INT(i)       (i)
        !            72: #else
        !            73: #define        _W_INT(w)       (*(int *)&(w))  /* convert union wait to int */
        !            74: #define        WCOREFLAG       0200
        !            75: 
        !            76: #endif /* _POSIX_SOURCE */
        !            77: 
        !            78: #define        _WSTATUS(x)     (_W_INT(x) & 0177)
        !            79: #define        _WSTOPPED       0177            /* _WSTATUS if process is stopped */
        !            80: #define WIFSTOPPED(x)  (_WSTATUS(x) == _WSTOPPED)
        !            81: #define WSTOPSIG(x)    (_W_INT(x) >> 8)
        !            82: #define WIFSIGNALED(x) (_WSTATUS(x) != _WSTOPPED && _WSTATUS(x) != 0)
        !            83: #define WTERMSIG(x)    (_WSTATUS(x))
        !            84: #define WIFEXITED(x)   (_WSTATUS(x) == 0)
        !            85: #define WEXITSTATUS(x) (_W_INT(x) >> 8)
        !            86: #if !defined(_POSIX_SOURCE)
        !            87: #define WCOREDUMP(x)   (_W_INT(x) & WCOREFLAG)
        !            88: 
        !            89: #define        W_EXITCODE(ret, sig)    ((ret) << 8 | (sig))
        !            90: #define        W_STOPCODE(sig)         ((sig) << 8 | _WSTOPPED)
        !            91: #endif /* !defined(_POSIX_SOURCE) */
        !            92: 
        !            93: /*
        !            94:  * Option bits for the third argument of wait4.  WNOHANG causes the
        !            95:  * wait to not hang if there are no stopped or terminated processes, rather
        !            96:  * returning an error indication in this case (pid==0).  WUNTRACED
        !            97:  * indicates that the caller should receive status about untraced children
        !            98:  * which stop due to signals.  If children are stopped and a wait without
        !            99:  * this option is done, it is as though they were still running... nothing
        !           100:  * about them is returned.
        !           101:  */
        !           102: #define WNOHANG                1       /* don't hang in wait */
        !           103: #define WUNTRACED      2       /* tell about stopped, untraced children */
        !           104: 
        !           105: #if !defined(_POSIX_SOURCE)
        !           106: /* POSIX extensions and 4.2/4.3 compatability: */
        !           107: 
        !           108: /*
        !           109:  * Tokens for special values of the "pid" parameter to wait4.
        !           110:  */
        !           111: #define        WAIT_ANY        (-1)    /* any process */
        !           112: #define        WAIT_MYPGRP     0       /* any process in my process group */
        !           113: 
        !           114: #include <machine/endian.h>
        !           115: 
        !           116: /*
        !           117:  * Deprecated:
        !           118:  * Structure of the information in the status word returned by wait4.
        !           119:  * If w_stopval==WSTOPPED, then the second structure describes
        !           120:  * the information returned, else the first.
        !           121:  */
        !           122: union wait {
        !           123:        int     w_status;               /* used in syscall */
        !           124:        /*
        !           125:         * Terminated process status.
        !           126:         */
        !           127:        struct {
        !           128: #if BYTE_ORDER == LITTLE_ENDIAN 
        !           129:                unsigned int    w_Termsig:7,    /* termination signal */
        !           130:                                w_Coredump:1,   /* core dump indicator */
        !           131:                                w_Retcode:8,    /* exit code if w_termsig==0 */
        !           132:                                w_Filler:16;    /* upper bits filler */
        !           133: #endif
        !           134: #if BYTE_ORDER == BIG_ENDIAN 
        !           135:                unsigned int    w_Filler:16,    /* upper bits filler */
        !           136:                                w_Retcode:8,    /* exit code if w_termsig==0 */
        !           137:                                w_Coredump:1,   /* core dump indicator */
        !           138:                                w_Termsig:7;    /* termination signal */
        !           139: #endif
        !           140:        } w_T;
        !           141:        /*
        !           142:         * Stopped process status.  Returned
        !           143:         * only for traced children unless requested
        !           144:         * with the WUNTRACED option bit.
        !           145:         */
        !           146:        struct {
        !           147: #if BYTE_ORDER == LITTLE_ENDIAN 
        !           148:                unsigned int    w_Stopval:8,    /* == W_STOPPED if stopped */
        !           149:                                w_Stopsig:8,    /* signal that stopped us */
        !           150:                                w_Filler:16;    /* upper bits filler */
        !           151: #endif
        !           152: #if BYTE_ORDER == BIG_ENDIAN 
        !           153:                unsigned int    w_Filler:16,    /* upper bits filler */
        !           154:                                w_Stopsig:8,    /* signal that stopped us */
        !           155:                                w_Stopval:8;    /* == W_STOPPED if stopped */
        !           156: #endif
        !           157:        } w_S;
        !           158: };
        !           159: #define        w_termsig       w_T.w_Termsig
        !           160: #define w_coredump     w_T.w_Coredump
        !           161: #define w_retcode      w_T.w_Retcode
        !           162: #define w_stopval      w_S.w_Stopval
        !           163: #define w_stopsig      w_S.w_Stopsig
        !           164: 
        !           165: #define        WSTOPPED        _WSTOPPED
        !           166: #endif /* !defined(_POSIX_SOURCE) */
        !           167: 
        !           168: #ifndef KERNEL
        !           169: #include <sys/types.h>
        !           170: #include <sys/cdefs.h>
        !           171: 
        !           172: __BEGIN_DECLS
        !           173: struct rusage; /* forward declaration */
        !           174: 
        !           175: pid_t  wait __P((int *));
        !           176: pid_t  waitpid __P((pid_t, int *, int));
        !           177: #if  !defined(_POSIX_SOURCE)
        !           178: pid_t  wait3 __P((int *, int, struct rusage *));
        !           179: pid_t  wait4 __P((pid_t, int *, int, struct rusage *));
        !           180: #endif /* !defined(_POSIX_SOURCE) */
        !           181: __END_DECLS
        !           182: #endif
        !           183: #endif /* !_SYS_WAIT_H_ */

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