1 /* $NetBSD: wait.h,v 1.26 2009/01/11 02:45:56 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 34 #ifndef _SYS_WAIT_H_ 35 #define _SYS_WAIT_H_ 36 37 #include <sys/featuretest.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 #if !( defined(_XOPEN_SOURCE) || defined(_NETBSD_SOURCE) ) || defined(_KERNEL) 49 #define _W_INT(i) (i) 50 #else 51 #define _W_INT(w) (*(int *)(void *)&(w)) /* convert union wait to int */ 52 #endif 53 54 #define _WSTATUS(x) (_W_INT(x) & 0177) 55 #define _WSTOPPED 0177 /* _WSTATUS if process is stopped */ 56 #define WIFSTOPPED(x) (_WSTATUS(x) == _WSTOPPED) 57 #define WSTOPSIG(x) ((int)(((unsigned int)_W_INT(x)) >> 8) & 0xff) 58 #define WIFSIGNALED(x) (_WSTATUS(x) != _WSTOPPED && _WSTATUS(x) != 0) 59 #define WTERMSIG(x) (_WSTATUS(x)) 60 #define WIFEXITED(x) (_WSTATUS(x) == 0) 61 #define WEXITSTATUS(x) ((int)(((unsigned int)_W_INT(x)) >> 8) & 0xff) 62 #if defined(_XOPEN_SOURCE) || defined(_NETBSD_SOURCE) || defined(_KERNEL) 63 #define WCOREFLAG 0200 64 #define WCOREDUMP(x) (_W_INT(x) & WCOREFLAG) 65 66 #define W_EXITCODE(ret, sig) ((ret) << 8 | (sig)) 67 #define W_STOPCODE(sig) ((sig) << 8 | _WSTOPPED) 68 #endif 69 70 /* 71 * Option bits for the third argument of wait4. 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 0x00000001 /* don't hang in wait */ 80 #define WUNTRACED 0x00000002 /* tell about stopped, 81 untraced children */ 82 #if defined(_XOPEN_SOURCE) || defined(_NETBSD_SOURCE) 83 #define WALTSIG 0x00000004 /* wait for processes that exit 84 with an alternate signal (i.e. 85 not SIGCHLD) */ 86 #define WALLSIG 0x00000008 /* wait for processes that exit 87 with any signal, i.e. SIGCHLD 88 and alternates */ 89 90 /* 91 * These are the Linux names of some of the above flags, for compatibility 92 * with Linux's clone(2) API. 93 */ 94 #define __WCLONE WALTSIG 95 #define __WALL WALLSIG 96 97 /* 98 * These bits are used in order to support SVR4 (etc) functionality 99 * without replicating sys_wait4 5 times. 100 */ 101 #define WNOWAIT 0x00010000 /* Don't mark child 'P_WAITED' */ 102 #define WNOZOMBIE 0x00020000 /* Ignore zombies */ 103 #define WOPTSCHECKED 0x00040000 /* Compat call, options verified */ 104 #endif /* _XOPEN_SOURCE || _NETBSD_SOURCE */ 105 106 #if defined(_XOPEN_SOURCE) || defined(_NETBSD_SOURCE) 107 /* POSIX extensions and 4.2/4.3 compatibility: */ 108 109 /* 110 * Tokens for special values of the "pid" parameter to wait4. 111 */ 112 #define WAIT_ANY (-1) /* any process */ 113 #define WAIT_MYPGRP 0 /* any process in my process group */ 114 115 #include <sys/types.h> 116 117 /* 118 * Deprecated: 119 * Structure of the information in the status word returned by wait4. 120 * If w_stopval==WSTOPPED, then the second structure describes 121 * the information returned, else the first. 122 */ 123 union wait { 124 int w_status; /* used in syscall */ 125 /* 126 * Terminated process status. 127 */ 128 struct { 129 #if BYTE_ORDER == LITTLE_ENDIAN 130 unsigned int w_Termsig:7, /* termination signal */ 131 w_Coredump:1, /* core dump indicator */ 132 w_Retcode:8, /* exit code if w_termsig==0 */ 133 w_Filler:16; /* upper bits filler */ 134 #endif 135 #if BYTE_ORDER == BIG_ENDIAN 136 unsigned int w_Filler:16, /* upper bits filler */ 137 w_Retcode:8, /* exit code if w_termsig==0 */ 138 w_Coredump:1, /* core dump indicator */ 139 w_Termsig:7; /* termination signal */ 140 #endif 141 } w_T; 142 /* 143 * Stopped process status. Returned 144 * only for traced children unless requested 145 * with the WUNTRACED option bit. 146 */ 147 struct { 148 #if BYTE_ORDER == LITTLE_ENDIAN 149 unsigned int w_Stopval:8, /* == W_STOPPED if stopped */ 150 w_Stopsig:8, /* signal that stopped us */ 151 w_Filler:16; /* upper bits filler */ 152 #endif 153 #if BYTE_ORDER == BIG_ENDIAN 154 unsigned int w_Filler:16, /* upper bits filler */ 155 w_Stopsig:8, /* signal that stopped us */ 156 w_Stopval:8; /* == W_STOPPED if stopped */ 157 #endif 158 } w_S; 159 }; 160 #define w_termsig w_T.w_Termsig 161 #define w_coredump w_T.w_Coredump 162 #define w_retcode w_T.w_Retcode 163 #define w_stopval w_S.w_Stopval 164 #define w_stopsig w_S.w_Stopsig 165 166 #define WSTOPPED _WSTOPPED 167 #endif /* _XOPEN_SOURCE || _NETBSD_SOURCE */ 168 169 #ifndef _KERNEL 170 #include <sys/cdefs.h> 171 172 __BEGIN_DECLS 173 struct rusage; /* forward declaration */ 174 175 pid_t wait(int *); 176 pid_t waitpid(pid_t, int *, int); 177 #if defined(_XOPEN_SOURCE) || defined(_NETBSD_SOURCE) 178 #ifndef __LIBC12_SOURCE__ 179 pid_t wait3(int *, int, struct rusage *) __RENAME(__wait350); 180 pid_t wait4(pid_t, int *, int, struct rusage *) __RENAME(__wait450); 181 #endif 182 #endif 183 __END_DECLS 184 #endif 185 186 #endif /* !_SYS_WAIT_H_ */ 187