bsd/sys/wait.h

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. The rights granted to you under the License
  10  * may not be used to create, or enable the creation or redistribution of,
  11  * unlawful or unlicensed copies of an Apple operating system, or to
  12  * circumvent, violate, or enable the circumvention or violation of, any
  13  * terms of an Apple operating system software license agreement.
  14  *
  15  * Please obtain a copy of the License at
  16  * http://www.opensource.apple.com/apsl/ and read it before using this file.
  17  *
  18  * The Original Code and all software distributed under the License are
  19  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  20  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  21  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  22  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  23  * Please see the License for the specific language governing rights and
  24  * limitations under the License.
  25  *
  26  * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  27  */
  28 /* Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved */
  29 /*
  30  * Copyright (c) 1982, 1986, 1989, 1993, 1994
  31  *      The Regents of the University of California.  All rights reserved.
  32  *
  33  * Redistribution and use in source and binary forms, with or without
  34  * modification, are permitted provided that the following conditions
  35  * are met:
  36  * 1. Redistributions of source code must retain the above copyright
  37  *    notice, this list of conditions and the following disclaimer.
  38  * 2. Redistributions in binary form must reproduce the above copyright
  39  *    notice, this list of conditions and the following disclaimer in the
  40  *    documentation and/or other materials provided with the distribution.
  41  * 3. All advertising materials mentioning features or use of this software
  42  *    must display the following acknowledgement:
  43  *      This product includes software developed by the University of
  44  *      California, Berkeley and its contributors.
  45  * 4. Neither the name of the University nor the names of its contributors
  46  *    may be used to endorse or promote products derived from this software
  47  *    without specific prior written permission.
  48  *
  49  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  50  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  51  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  52  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  53  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  54  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  55  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  56  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  57  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  58  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  59  * SUCH DAMAGE.
  60  *
  61  *      @(#)wait.h      8.2 (Berkeley) 7/10/94
  62  */
  63
  64 #ifndef _SYS_WAIT_H_
  65 #define _SYS_WAIT_H_
  66
  67 #include <sys/cdefs.h>
  68 #include <sys/_types.h>
  69
  70 /*
  71  * This file holds definitions relevent to the wait4 system call
  72  * and the alternate interfaces that use it (wait, wait3, waitpid).
  73  */
  74
  75 /*
  76  * [XSI] The type idtype_t shall be defined as an enumeration type whose
  77  * possible values shall include at least P_ALL, P_PID, and P_PGID.
  78  */
  79 typedef enum {
  80         P_ALL,
  81         P_PID,
  82         P_PGID
  83 } idtype_t;
  84
  85 /*
  86  * [XSI] The id_t and pid_t types shall be defined as described
  87  * in <sys/types.h>
  88  */
  89 #ifndef _PID_T
  90 typedef __darwin_pid_t  pid_t;
  91 #define _PID_T
  92 #endif
  93
  94 #ifndef _ID_T
  95 typedef __darwin_id_t   id_t;
  96 #define _ID_T
  97 #endif
  98
  99 /*
 100  * [XSI] The siginfo_t type shall be defined as described in <signal.h>
 101  * [XSI] The rusage structure shall be defined as described in <sys/resource.h>
 102  * [XSI] Inclusion of the <sys/wait.h> header may also make visible all
 103  * symbols from <signal.h> and <sys/resource.h>
 104  *
 105  * NOTE:        This requirement is currently being satisfied by the direct
 106  *              inclusion of <sys/signal.h> and <sys/resource.h>, below.
 107  *
 108  *              Software should not depend on the exposure of anything other
 109  *              than the types siginfo_t and struct rusage as a result of
 110  *              this inclusion.  If you depend on any types or manifest
 111  *              values othe than siginfo_t and struct rusage from either of
 112  *              those files, you should explicitly include them yourself, as
 113  *              well, or in future releases your stware may not compile
 114  *              without modification.
 115  */
 116 #include <sys/signal.h>         /* [XSI] for siginfo_t */
 117 #include <sys/resource.h>       /* [XSI] for struct rusage */
 118
 119 /*
 120  * Option bits for the third argument of wait4.  WNOHANG causes the
 121  * wait to not hang if there are no stopped or terminated processes, rather
 122  * returning an error indication in this case (pid==0).  WUNTRACED
 123  * indicates that the caller should receive status about untraced children
 124  * which stop due to signals.  If children are stopped and a wait without
 125  * this option is done, it is as though they were still running... nothing
 126  * about them is returned.
 127  */
 128 #define WNOHANG         0x01    /* [XSI] don't hang in wait/no child to reap */
 129 #define WUNTRACED       0x02    /* [XSI] notify on stopped, untraced children */
 130
 131 /*
 132  * Macros to test the exit status returned by wait
 133  * and extract the relevant values.
 134  */
 135 #ifdef _POSIX_C_SOURCE
 136 #define _W_INT(i)       (i)
 137 #else
 138 #define _W_INT(w)       (*(int *)&(w))  /* convert union wait to int */
 139 #define WCOREFLAG       0200
 140 #endif /* _POSIX_C_SOURCE */
 141
 142 /* These macros are permited, as they are in the implementation namespace */
 143 #define _WSTATUS(x)     (_W_INT(x) & 0177)
 144 #define _WSTOPPED       0177            /* _WSTATUS if process is stopped */
 145
 146 /*
 147  * [XSI] The <sys/wait.h> header shall define the following macros for
 148  * analysis of process status values
 149  */
 150 #define WEXITSTATUS(x)  (_W_INT(x) >> 8)
 151 #define WIFCONTINUED(x) (x == 0x13)     /* 0x13 == SIGCONT */
 152 #define WIFEXITED(x)    (_WSTATUS(x) == 0)
 153 #define WIFSIGNALED(x)  (_WSTATUS(x) != _WSTOPPED && _WSTATUS(x) != 0)
 154 #define WIFSTOPPED(x)   (_WSTATUS(x) == _WSTOPPED)
 155 #define WSTOPSIG(x)     (_W_INT(x) >> 8)
 156 #define WTERMSIG(x)     (_WSTATUS(x))
 157 #if !defined(_POSIX_C_SOURCE)
 158 #define WCOREDUMP(x)    (_W_INT(x) & WCOREFLAG)
 159
 160 #define W_EXITCODE(ret, sig)    ((ret) << 8 | (sig))
 161 #define W_STOPCODE(sig)         ((sig) << 8 | _WSTOPPED)
 162 #endif /* !defined(_POSIX_C_SOURCE) */
 163
 164 /*
 165  * [XSI] The following symbolic constants shall be defined as possible
 166  * values for the fourth argument to waitid().
 167  */
 168 /* WNOHANG already defined for wait4() */
 169 /* WUNTRACED defined for wait4() but not for waitid() */
 170 #define WEXITED         0x04    /* [XSI] Processes which have exitted */
 171 #ifdef _POSIX_C_SOURCE
 172 /* waitid() parameter */
 173 #define WSTOPPED        0x08    /* [XSI] Any child stopped by signal receipt */
 174 #endif
 175 #define WCONTINUED      0x10    /* [XSI] Any child stopped then continued */
 176 #define WNOWAIT         0x20    /* [XSI] Leave process returned waitable */
 177
 178
 179 #if !defined(_POSIX_C_SOURCE)
 180 /* POSIX extensions and 4.2/4.3 compatability: */
 181
 182 /*
 183  * Tokens for special values of the "pid" parameter to wait4.
 184  */
 185 #define WAIT_ANY        (-1)    /* any process */
 186 #define WAIT_MYPGRP     0       /* any process in my process group */
 187
 188 #include <machine/endian.h>
 189
 190 /*
 191  * Deprecated:
 192  * Structure of the information in the status word returned by wait4.
 193  * If w_stopval==WSTOPPED, then the second structure describes
 194  * the information returned, else the first.
 195  */
 196 union wait {
 197         int     w_status;               /* used in syscall */
 198         /*
 199          * Terminated process status.
 200          */
 201         struct {
 202 #if __DARWIN_BYTE_ORDER == __DARWIN_LITTLE_ENDIAN
 203                 unsigned int    w_Termsig:7,    /* termination signal */
 204                                 w_Coredump:1,   /* core dump indicator */
 205                                 w_Retcode:8,    /* exit code if w_termsig==0 */
 206                                 w_Filler:16;    /* upper bits filler */
 207 #endif
 208 #if __DARWIN_BYTE_ORDER == __DARWIN_BIG_ENDIAN
 209                 unsigned int    w_Filler:16,    /* upper bits filler */
 210                                 w_Retcode:8,    /* exit code if w_termsig==0 */
 211                                 w_Coredump:1,   /* core dump indicator */
 212                                 w_Termsig:7;    /* termination signal */
 213 #endif
 214         } w_T;
 215         /*
 216          * Stopped process status.  Returned
 217          * only for traced children unless requested
 218          * with the WUNTRACED option bit.
 219          */
 220         struct {
 221 #if __DARWIN_BYTE_ORDER == __DARWIN_LITTLE_ENDIAN
 222                 unsigned int    w_Stopval:8,    /* == W_STOPPED if stopped */
 223                                 w_Stopsig:8,    /* signal that stopped us */
 224                                 w_Filler:16;    /* upper bits filler */
 225 #endif
 226 #if __DARWIN_BYTE_ORDER == __DARWIN_BIG_ENDIAN
 227                 unsigned int    w_Filler:16,    /* upper bits filler */
 228                                 w_Stopsig:8,    /* signal that stopped us */
 229                                 w_Stopval:8;    /* == W_STOPPED if stopped */
 230 #endif
 231         } w_S;
 232 };
 233 #define w_termsig       w_T.w_Termsig
 234 #define w_coredump      w_T.w_Coredump
 235 #define w_retcode       w_T.w_Retcode
 236 #define w_stopval       w_S.w_Stopval
 237 #define w_stopsig       w_S.w_Stopsig
 238
 239 /*
 240  * Stopped state value; cannot use waitid() parameter of the same name
 241  * in the same scope
 242  */
 243 #define WSTOPPED        _WSTOPPED
 244 #endif /* !defined(_POSIX_C_SOURCE) */
 245
 246 #ifndef KERNEL
 247 __BEGIN_DECLS
 248 pid_t   wait(int *);
 249 pid_t   waitpid(pid_t, int *, int);
 250 #ifndef _ANSI_SOURCE
 251 int     waitid(idtype_t, id_t, siginfo_t *, int);
 252 #endif /* !_ANSI_SOURCE */
 253 #if  !defined(_POSIX_C_SOURCE)
 254 pid_t   wait3(int *, int, struct rusage *);
 255 pid_t   wait4(pid_t, int *, int, struct rusage *);
 256 #endif /* !defined(_POSIX_C_SOURCE) */
 257 __END_DECLS
 258 #endif
 259 #endif /* !_SYS_WAIT_H_ */