1 /* $NetBSD: wait.h,v 1.24 2005/12/11 12:25:21 christos Exp $ */ 2 3 /* 4 * Copyright (c) 1982, 1986, 1989, 1993, 1994 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 * 31 * @(#)wait.h 8.2 (Berkeley) 7/10/94 32 */ 33 #ifndef _SYS_WAIT_H_ 34 #define _SYS_WAIT_H_ 35 36 #include <sys/featuretest.h> 37 #include <sys/types.h> 38 39 /* 40 * This file holds definitions relevent to the wait4 system call 41 * and the alternate interfaces that use it (wait, wait3, waitpid). 42 */ 43 44 /* 45 * Macros to test the exit status returned by wait 46 * and extract the relevant values. 47 */ 48 #define _W_INT(w) (*(int *)(void *)&(w)) /* convert union wait to int */ 49 50 #define _WSTATUS(x) (_W_INT(x) & 0177) 51 #define _WSTOPPED 0177 /* _WSTATUS if process is stopped */ 52 #define WIFSTOPPED(x) (_WSTATUS(x) == _WSTOPPED) 53 #define WSTOPSIG(x) ((int)(((unsigned int)_W_INT(x)) >> 8) & 0xff) 54 #define WIFSIGNALED(x) (_WSTATUS(x) != _WSTOPPED && _WSTATUS(x) != 0) 55 #define WTERMSIG(x) (_WSTATUS(x)) 56 #define WIFEXITED(x) (_WSTATUS(x) == 0) 57 #define WEXITSTATUS(x) ((int)(((unsigned int)_W_INT(x)) >> 8) & 0xff) 58 #define WCOREFLAG 0200 59 #define WCOREDUMP(x) (_W_INT(x) & WCOREFLAG) 60 61 #define W_EXITCODE(ret, sig) ((ret) << 8 | (sig)) 62 #define W_STOPCODE(sig) ((sig) << 8 | _WSTOPPED) 63 64 /* 65 * Option bits for the third argument of wait4. WNOHANG causes the 66 * wait to not hang if there are no stopped or terminated processes, rather 67 * returning an error indication in this case (pid==0). WUNTRACED 68 * indicates that the caller should receive status about untraced children 69 * which stop due to signals. If children are stopped and a wait without 70 * this option is done, it is as though they were still running... nothing 71 * about them is returned. 72 */ 73 #define WNOHANG 0x00000001 /* don't hang in wait */ 74 #define WUNTRACED 0x00000002 /* tell about stopped, 75 untraced children */ 76 #if defined(_XOPEN_SOURCE) || defined(_NETBSD_SOURCE) 77 #define WALTSIG 0x00000004 /* wait for processes that exit 78 with an alternate signal (i.e. 79 not SIGCHLD) */ 80 #define WALLSIG 0x00000008 /* wait for processes that exit 81 with any signal, i.e. SIGCHLD 82 and alternates */ 83 84 /* 85 * These are the Linux names of some of the above flags, for compatibility 86 * with Linux's clone(2) API. 87 */ 88 #define __WCLONE WALTSIG 89 #define __WALL WALLSIG 90 91 /* 92 * These bits are used in order to support SVR4 (etc) functionality 93 * without replicating sys_wait4 5 times. 94 */ 95 #define WNOWAIT 0x00010000 /* Don't mark child 'P_WAITED' */ 96 #define WNOZOMBIE 0x00020000 /* Ignore zombies */ 97 #endif /* _XOPEN_SOURCE || _NETBSD_SOURCE */ 98 99 /* POSIX extensions and 4.2/4.3 compatibility: */ 100 101 /* 102 * Tokens for special values of the "pid" parameter to wait4. 103 */ 104 #define WAIT_ANY (-1) /* any process */ 105 #define WAIT_MYPGRP 0 /* any process in my process group */ 106 107 /* 108 * Deprecated: 109 * Structure of the information in the status word returned by wait4. 110 * If w_stopval==WSTOPPED, then the second structure describes 111 * the information returned, else the first. 112 */ 113 union wait { 114 int w_status; /* used in syscall */ 115 /* 116 * Terminated process status. 117 */ 118 struct { 119 #if BYTE_ORDER == LITTLE_ENDIAN 120 unsigned int w_Termsig:7, /* termination signal */ 121 w_Coredump:1, /* core dump indicator */ 122 w_Retcode:8, /* exit code if w_termsig==0 */ 123 w_Filler:16; /* upper bits filler */ 124 #endif 125 #if BYTE_ORDER == BIG_ENDIAN 126 unsigned int w_Filler:16, /* upper bits filler */ 127 w_Retcode:8, /* exit code if w_termsig==0 */ 128 w_Coredump:1, /* core dump indicator */ 129 w_Termsig:7; /* termination signal */ 130 #endif 131 } w_T; 132 /* 133 * Stopped process status. Returned 134 * only for traced children unless requested 135 * with the WUNTRACED option bit. 136 */ 137 struct { 138 #if BYTE_ORDER == LITTLE_ENDIAN 139 unsigned int w_Stopval:8, /* == W_STOPPED if stopped */ 140 w_Stopsig:8, /* signal that stopped us */ 141 w_Filler:16; /* upper bits filler */ 142 #endif 143 #if BYTE_ORDER == BIG_ENDIAN 144 unsigned int w_Filler:16, /* upper bits filler */ 145 w_Stopsig:8, /* signal that stopped us */ 146 w_Stopval:8; /* == W_STOPPED if stopped */ 147 #endif 148 } w_S; 149 }; 150 #define w_termsig w_T.w_Termsig 151 #define w_coredump w_T.w_Coredump 152 #define w_retcode w_T.w_Retcode 153 #define w_stopval w_S.w_Stopval 154 #define w_stopsig w_S.w_Stopsig 155 156 #define WSTOPPED _WSTOPPED 157 158 __BEGIN_DECLS 159 pid_t wait(int *); 160 161 #if 0 /* Normally declared here but not implemented for UEFI. */ 162 struct rusage; /* forward declaration */ 163 164 pid_t waitpid(pid_t, int *, int); 165 pid_t wait3(int *, int, struct rusage *); 166 pid_t wait4(pid_t, int *, int, struct rusage *); 167 #endif 168 __END_DECLS 169 170 #endif /* !_SYS_WAIT_H_ */ 171
