Annotation of sys/sys/wait.h, Revision 1.1
1.1 ! nbrk 1: /* $OpenBSD: wait.h,v 1.14 2006/04/27 02:17:21 tedu Exp $ */
! 2: /* $NetBSD: wait.h,v 1.11 1996/04/09 20:55:51 cgd Exp $ */
! 3:
! 4: /*
! 5: * Copyright (c) 1982, 1986, 1989, 1993, 1994
! 6: * The Regents of the University of California. All rights reserved.
! 7: *
! 8: * Redistribution and use in source and binary forms, with or without
! 9: * modification, are permitted provided that the following conditions
! 10: * are met:
! 11: * 1. Redistributions of source code must retain the above copyright
! 12: * notice, this list of conditions and the following disclaimer.
! 13: * 2. Redistributions in binary form must reproduce the above copyright
! 14: * notice, this list of conditions and the following disclaimer in the
! 15: * documentation and/or other materials provided with the distribution.
! 16: * 3. Neither the name of the University nor the names of its contributors
! 17: * may be used to endorse or promote products derived from this software
! 18: * without specific prior written permission.
! 19: *
! 20: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
! 21: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
! 22: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
! 23: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
! 24: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
! 25: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
! 26: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
! 27: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
! 28: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
! 29: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
! 30: * SUCH DAMAGE.
! 31: *
! 32: * @(#)wait.h 8.2 (Berkeley) 7/10/94
! 33: */
! 34:
! 35: #ifndef _SYS_WAIT_H_
! 36: #define _SYS_WAIT_H_
! 37:
! 38: #include <sys/cdefs.h>
! 39:
! 40: /*
! 41: * This file holds definitions relevent to the wait4 system call
! 42: * and the alternate interfaces that use it (wait, wait3, waitpid).
! 43: */
! 44:
! 45: /*
! 46: * Macros to test the exit status returned by wait
! 47: * and extract the relevant values.
! 48: */
! 49: #if __BSD_VISIBLE
! 50: #define _W_INT(w) (*(int *)&(w)) /* convert union wait to int */
! 51: #else
! 52: #define _W_INT(i) (i)
! 53: #endif
! 54:
! 55: #define _WSTATUS(x) (_W_INT(x) & 0177)
! 56: #define _WSTOPPED 0177 /* _WSTATUS if process is stopped */
! 57: #define _WCONTINUED 0177777 /* process has continued */
! 58: #define WIFSTOPPED(x) ((_W_INT(x) & 0xff) == _WSTOPPED)
! 59: #define WSTOPSIG(x) (int)(((unsigned)_W_INT(x) >> 8) & 0xff)
! 60: #define WIFSIGNALED(x) (_WSTATUS(x) != _WSTOPPED && _WSTATUS(x) != 0)
! 61: #define WTERMSIG(x) (_WSTATUS(x))
! 62: #define WIFEXITED(x) (_WSTATUS(x) == 0)
! 63: #define WEXITSTATUS(x) (int)(((unsigned)_W_INT(x) >> 8) & 0xff)
! 64: #define WIFCONTINUED(x) ((_W_INT(x) & _WCONTINUED) == _WCONTINUED)
! 65: #if __XPG_VISIBLE
! 66: #define WCOREFLAG 0200
! 67: #define WCOREDUMP(x) (_W_INT(x) & WCOREFLAG)
! 68:
! 69: #define W_EXITCODE(ret, sig) ((ret) << 8 | (sig))
! 70: #define W_STOPCODE(sig) ((sig) << 8 | _WSTOPPED)
! 71: #endif
! 72:
! 73: /*
! 74: * Option bits for the third argument of wait4. WNOHANG causes the
! 75: * wait to not hang if there are no stopped or terminated processes, rather
! 76: * returning an error indication in this case (pid==0). WUNTRACED
! 77: * indicates that the caller should receive status about untraced children
! 78: * which stop due to signals. If children are stopped and a wait without
! 79: * this option is done, it is as though they were still running... nothing
! 80: * about them is returned.
! 81: */
! 82: #define WNOHANG 1 /* don't hang in wait */
! 83: #define WUNTRACED 2 /* tell about stopped, untraced children */
! 84: #if __XPG_VISIBLE
! 85: #define WALTSIG 4 /* wait for child with alternate exit signal */
! 86: #endif
! 87: #define WCONTINUED 8 /* report a job control continued process */
! 88:
! 89: #if __BSD_VISIBLE
! 90: /*
! 91: * Tokens for special values of the "pid" parameter to wait4.
! 92: */
! 93: #define WAIT_ANY (-1) /* any process */
! 94: #define WAIT_MYPGRP 0 /* any process in my process group */
! 95:
! 96: #include <sys/types.h>
! 97:
! 98: /*
! 99: * Deprecated:
! 100: * Structure of the information in the status word returned by wait4.
! 101: * If w_stopval==WSTOPPED, then the second structure describes
! 102: * the information returned, else the first.
! 103: */
! 104: union wait {
! 105: int w_status; /* used in syscall */
! 106: /*
! 107: * Terminated process status.
! 108: */
! 109: struct {
! 110: #if _BYTE_ORDER == _LITTLE_ENDIAN
! 111: unsigned int w_Termsig:7, /* termination signal */
! 112: w_Coredump:1, /* core dump indicator */
! 113: w_Retcode:8, /* exit code if w_termsig==0 */
! 114: w_Filler:16; /* upper bits filler */
! 115: #endif
! 116: #if _BYTE_ORDER == _BIG_ENDIAN
! 117: unsigned int w_Filler:16, /* upper bits filler */
! 118: w_Retcode:8, /* exit code if w_termsig==0 */
! 119: w_Coredump:1, /* core dump indicator */
! 120: w_Termsig:7; /* termination signal */
! 121: #endif
! 122: } w_T;
! 123: /*
! 124: * Stopped process status. Returned
! 125: * only for traced children unless requested
! 126: * with the WUNTRACED option bit.
! 127: */
! 128: struct {
! 129: #if _BYTE_ORDER == _LITTLE_ENDIAN
! 130: unsigned int w_Stopval:8, /* == W_STOPPED if stopped */
! 131: w_Stopsig:8, /* signal that stopped us */
! 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_Stopsig:8, /* signal that stopped us */
! 137: w_Stopval:8; /* == W_STOPPED if stopped */
! 138: #endif
! 139: } w_S;
! 140: };
! 141: #define w_termsig w_T.w_Termsig
! 142: #define w_coredump w_T.w_Coredump
! 143: #define w_retcode w_T.w_Retcode
! 144: #define w_stopval w_S.w_Stopval
! 145: #define w_stopsig w_S.w_Stopsig
! 146:
! 147: #define WSTOPPED _WSTOPPED
! 148: #endif /* __BSD_VISIBLE */
! 149:
! 150: #ifndef _KERNEL
! 151: #include <sys/types.h>
! 152:
! 153: __BEGIN_DECLS
! 154: struct rusage; /* forward declaration */
! 155:
! 156: pid_t wait(int *);
! 157: pid_t waitpid(pid_t, int *, int);
! 158: #if __BSD_VISIBLE
! 159: pid_t wait3(int *, int, struct rusage *);
! 160: pid_t wait4(pid_t, int *, int, struct rusage *);
! 161: #endif
! 162: __END_DECLS
! 163: #endif
! 164:
! 165: #endif /* !_SYS_WAIT_H_ */
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