bsd/sys/signal.h

   1 /*
   2  * Copyright (c) 2000-2002 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
   7  *
   8  * This file contains Original Code and/or Modifications of Original Code
   9  * as defined in and that are subject to the Apple Public Source License
  10  * Version 2.0 (the 'License'). You may not use this file except in
  11  * compliance with the License. Please obtain a copy of the License at
  12  * http://www.opensource.apple.com/apsl/ and read it before using this
  13  * file.
  14  *
  15  * The Original Code and all software distributed under the License are
  16  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  17  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  18  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  20  * Please see the License for the specific language governing rights and
  21  * limitations under the License.
  22  *
  23  * @APPLE_LICENSE_HEADER_END@
  24  */
  25 /* Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved */
  26 /*
  27  * Copyright (c) 1982, 1986, 1989, 1991, 1993
  28  *      The Regents of the University of California.  All rights reserved.
  29  * (c) UNIX System Laboratories, Inc.
  30  * All or some portions of this file are derived from material licensed
  31  * to the University of California by American Telephone and Telegraph
  32  * Co. or Unix System Laboratories, Inc. and are reproduced herein with
  33  * the permission of UNIX System Laboratories, Inc.
  34  *
  35  * Redistribution and use in source and binary forms, with or without
  36  * modification, are permitted provided that the following conditions
  37  * are met:
  38  * 1. Redistributions of source code must retain the above copyright
  39  *    notice, this list of conditions and the following disclaimer.
  40  * 2. Redistributions in binary form must reproduce the above copyright
  41  *    notice, this list of conditions and the following disclaimer in the
  42  *    documentation and/or other materials provided with the distribution.
  43  * 3. All advertising materials mentioning features or use of this software
  44  *    must display the following acknowledgement:
  45  *      This product includes software developed by the University of
  46  *      California, Berkeley and its contributors.
  47  * 4. Neither the name of the University nor the names of its contributors
  48  *    may be used to endorse or promote products derived from this software
  49  *    without specific prior written permission.
  50  *
  51  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  52  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  53  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  54  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  55  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  56  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  57  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  58  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  59  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  60  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  61  * SUCH DAMAGE.
  62  *
  63  *      @(#)signal.h    8.2 (Berkeley) 1/21/94
  64  */
  65
  66 #ifndef _SYS_SIGNAL_H_
  67 #define _SYS_SIGNAL_H_
  68
  69 #include <sys/appleapiopts.h>
  70
  71 #if !defined(_ANSI_SOURCE) && !defined(_POSIX_SOURCE)
  72 #define NSIG    32              /* counting 0; could be 33 (mask is 1-32) */
  73 #endif
  74
  75 #include <machine/signal.h>     /* sigcontext; codes for SIGILL, SIGFPE */
  76
  77 #define SIGHUP  1       /* hangup */
  78 #define SIGINT  2       /* interrupt */
  79 #define SIGQUIT 3       /* quit */
  80 #define SIGILL  4       /* illegal instruction (not reset when caught) */
  81 #if  !defined(_POSIX_SOURCE)
  82 #define SIGTRAP 5       /* trace trap (not reset when caught) */
  83 #endif
  84 #define SIGABRT 6       /* abort() */
  85 #if  !defined(_POSIX_SOURCE)
  86 #define SIGIOT  SIGABRT /* compatibility */
  87 #define SIGEMT  7       /* EMT instruction */
  88 #endif
  89 #define SIGFPE  8       /* floating point exception */
  90 #define SIGKILL 9       /* kill (cannot be caught or ignored) */
  91 #if  !defined(_POSIX_SOURCE)
  92 #define SIGBUS  10      /* bus error */
  93 #endif
  94 #define SIGSEGV 11      /* segmentation violation */
  95 #if  !defined(_POSIX_SOURCE)
  96 #define SIGSYS  12      /* bad argument to system call */
  97 #endif
  98 #define SIGPIPE 13      /* write on a pipe with no one to read it */
  99 #define SIGALRM 14      /* alarm clock */
 100 #define SIGTERM 15      /* software termination signal from kill */
 101 #if  !defined(_POSIX_SOURCE)
 102 #define SIGURG  16      /* urgent condition on IO channel */
 103 #endif
 104 #define SIGSTOP 17      /* sendable stop signal not from tty */
 105 #define SIGTSTP 18      /* stop signal from tty */
 106 #define SIGCONT 19      /* continue a stopped process */
 107 #define SIGCHLD 20      /* to parent on child stop or exit */
 108 #define SIGTTIN 21      /* to readers pgrp upon background tty read */
 109 #define SIGTTOU 22      /* like TTIN for output if (tp->t_local&LTOSTOP) */
 110 #if  !defined(_POSIX_SOURCE)
 111 #define SIGIO   23      /* input/output possible signal */
 112 #define SIGXCPU 24      /* exceeded CPU time limit */
 113 #define SIGXFSZ 25      /* exceeded file size limit */
 114 #define SIGVTALRM 26    /* virtual time alarm */
 115 #define SIGPROF 27      /* profiling time alarm */
 116 #define SIGWINCH 28     /* window size changes */
 117 #define SIGINFO 29      /* information request */
 118 #endif
 119 #define SIGUSR1 30      /* user defined signal 1 */
 120 #define SIGUSR2 31      /* user defined signal 2 */
 121
 122 #if defined(_ANSI_SOURCE) || defined(__cplusplus)
 123 /*
 124  * Language spec sez we must list exactly one parameter, even though we
 125  * actually supply three.  Ugh!
 126  */
 127 #define SIG_DFL         (void (*)(int))0
 128 #define SIG_IGN         (void (*)(int))1
 129 #define SIG_ERR         (void (*)(int))-1
 130 #else
 131 #define SIG_DFL         (void (*)())0
 132 #define SIG_IGN         (void (*)())1
 133 #define SIG_ERR         (void (*)())-1
 134 #endif
 135
 136 #ifndef _ANSI_SOURCE
 137 typedef unsigned int sigset_t;
 138
 139 union sigval {
 140         /* Members as suggested by Annex C of POSIX 1003.1b. */
 141         int     sigval_int;
 142         void    *sigval_ptr;
 143 };
 144
 145 #define SIGEV_NONE      0               /* No async notification */
 146 #ifdef __APPLE_API_PRIVATE
 147 #define SIGEV_SIGNAL    1               /* Generate a queued signal */
 148 #define SIGEV_THREAD    3               /* A notification function will be called to perfrom notification */
 149 #endif /*__APPLE_API_PRIVATE */
 150
 151 typedef struct __siginfo {
 152         int     si_signo;               /* signal number */
 153         int     si_errno;               /* errno association */
 154         int     si_code;                /* signal code */
 155         int     si_pid;                 /* sending process */
 156         unsigned int si_uid;            /* sender's ruid */
 157         int     si_status;              /* exit value */
 158         void    *si_addr;               /* faulting instruction */
 159         union sigval si_value;          /* signal value */
 160         long    si_band;                /* band event for SIGPOLL */
 161         int     pad[7];                 /* RFU */
 162 } siginfo_t;
 163
 164 /*
 165  * Incase of SIGILL and SIGFPE, si_addr contains the address of
 166  *  faulting instruction.
 167  * Incase of SIGSEGV and SIGBUS, si_addr contains address of
 168  *  faulting memory reference.
 169  * Incase of SIGCHLD, si_pid willhave child process ID,
 170  *  si_status will contain exit value or signal.
 171  *  si_uid contains real user ID of the process that sent the signal
 172  */
 173
 174 /* Values for si_code */
 175
 176 /* Codes for SIGILL */
 177 #define ILL_NOOP        0       /* if only I knew... */
 178 #define ILL_ILLOPC      1       /* illegal opcode */
 179 #define ILL_ILLTRP      2       /* illegal trap */
 180 #define ILL_PRVOPC      3       /* privileged opcode */
 181
 182 /* Codes for SIGFPE */
 183 #define FPE_NOOP        0       /* if only I knew... */
 184 #define FPE_FLTDIV      1       /* floating point divide by zero */
 185 #define FPE_FLTOVF      2       /* floating point overflow */
 186 #define FPE_FLTUND      3       /* floating point underflow */
 187 #define FPE_FLTRES      4       /* floating point inexact result */
 188 #define FPE_FLTINV      5       /* invalid floating point operation */
 189
 190 /* Codes for SIGSEGV */
 191 #define SEGV_NOOP       0       /* if only I knew... */
 192 #define SEGV_MAPERR     1       /* address not mapped to object */
 193 #define SEGV_ACCERR     2       /* invalid permissions for mapped to object */
 194
 195 /* Codes for SIGBUS */
 196 #define BUS_NOOP        0       /* if only I knew... */
 197 #define BUS_ADRALN      1       /* invalid address alignment */
 198
 199 /* Codes for SIGCHLD */
 200 #define CLD_NOOP        0       /* if only I knew... */
 201 #define CLD_EXITED      1       /* child has exited */
 202 #define CLD_KILLED      2
 203         /* child has terminated abnormally and did not create a core file */
 204 #define CLD_DUMPED      3
 205         /* child has terminated abnormally and create a core file */
 206 #define CLD_TRAPPED     4       /* traced child has trapped */
 207 #define CLD_STOPPED     5       /* child has stopped */
 208 #define CLD_CONTINUED   6       /* stopped child has continued */
 209
 210 /* union for signal handlers */
 211 union __sigaction_u {
 212         void    (*__sa_handler)(int);
 213         void    (*__sa_sigaction)(int, struct __siginfo *,
 214                        void *);
 215 };
 216
 217 /* Signal vector template for Kernel user boundary */
 218 struct  __sigaction {
 219         union __sigaction_u __sigaction_u;  /* signal handler */
 220         void    (*sa_tramp)(void *, int, int, siginfo_t *, void *);
 221         sigset_t sa_mask;               /* signal mask to apply */
 222         int     sa_flags;               /* see signal options below */
 223 };
 224
 225 /*
 226  * Signal vector "template" used in sigaction call.
 227  */
 228 struct  sigaction {
 229         union __sigaction_u __sigaction_u;  /* signal handler */
 230         sigset_t sa_mask;               /* signal mask to apply */
 231         int     sa_flags;               /* see signal options below */
 232 };
 233 /* if SA_SIGINFO is set, sa_sigaction is to be used instead of sa_handler. */
 234 #define sa_handler      __sigaction_u.__sa_handler
 235 #define sa_sigaction    __sigaction_u.__sa_sigaction
 236
 237
 238 #if  !defined(_POSIX_SOURCE)
 239 #define SA_ONSTACK      0x0001  /* take signal on signal stack */
 240 #define SA_RESTART      0x0002  /* restart system on signal return */
 241 #define SA_DISABLE      0x0004  /* disable taking signals on alternate stack */
 242 #define SA_RESETHAND    0x0004  /* reset to SIG_DFL when taking signal */
 243 #define SA_NODEFER      0x0010  /* don't mask the signal we're delivering */
 244 #define SA_NOCLDWAIT    0x0020  /* don't keep zombies around */
 245 #define SA_SIGINFO      0x0040  /* signal handler with SA_SIGINFO args */
 246 #define SA_USERTRAMP    0x0100  /* do not bounce off kernel's sigtramp */
 247 #endif
 248 #define SA_NOCLDSTOP    0x0008  /* do not generate SIGCHLD on child stop */
 249
 250 /*
 251  * Flags for sigprocmask:
 252  */
 253 #define SIG_BLOCK       1       /* block specified signal set */
 254 #define SIG_UNBLOCK     2       /* unblock specified signal set */
 255 #define SIG_SETMASK     3       /* set specified signal set */
 256
 257 /* POSIX 1003.1b required values. */
 258 #define SI_USER         0x10001
 259 #define SI_QUEUE        0x10002
 260 #define SI_TIMER        0x10003
 261 #define SI_ASYNCIO      0x10004
 262 #define SI_MESGQ        0x10005
 263
 264 #if !defined(_POSIX_SOURCE)
 265 #include <sys/cdefs.h>
 266 typedef void (*sig_t) __P((int));       /* type of signal function */
 267
 268 /*
 269  * Structure used in sigaltstack call.
 270  */
 271 struct  sigaltstack {
 272         char    *ss_sp;         /* signal stack base */
 273         int     ss_size;                /* signal stack length */
 274         int     ss_flags;               /* SA_DISABLE and/or SA_ONSTACK */
 275 };
 276
 277 typedef struct  sigaltstack stack_t;
 278
 279 #define SS_ONSTACK      0x0001  /* take signal on signal stack */
 280 #define SS_DISABLE      0x0004  /* disable taking signals on alternate stack */
 281 #define MINSIGSTKSZ     8192                    /* minimum allowable stack */
 282 #define SIGSTKSZ        (MINSIGSTKSZ + 32768)   /* recommended stack size */
 283
 284 /*
 285  * 4.3 compatibility:
 286  * Signal vector "template" used in sigvec call.
 287  */
 288 struct  sigvec {
 289         void    (*sv_handler)(int);     /* signal handler */
 290         int     sv_mask;                /* signal mask to apply */
 291         int     sv_flags;               /* see signal options below */
 292 };
 293
 294 #define SV_ONSTACK      SA_ONSTACK
 295 #define SV_INTERRUPT    SA_RESTART      /* same bit, opposite sense */
 296 #define SV_RESETHAND    SA_RESETHAND
 297 #define SV_NODEFER      SA_NODEFER
 298 #define SV_NOCLDSTOP    SA_NOCLDSTOP
 299 #define SV_SIGINFO      SA_SIGINFO
 300
 301 #define sv_onstack sv_flags     /* isn't compatibility wonderful! */
 302
 303 /*
 304  * Structure used in sigstack call.
 305  */
 306 struct  sigstack {
 307         char    *ss_sp;                 /* signal stack pointer */
 308         int     ss_onstack;             /* current status */
 309 };
 310
 311 /*
 312  * Macro for converting signal number to a mask suitable for
 313  * sigblock().
 314  */
 315 #define sigmask(m)      (1 << ((m)-1))
 316
 317 #ifdef  KERNEL
 318 #ifdef __APPLE_API_PRIVATE
 319 /*
 320  *      signals delivered on a per-thread basis.
 321  */
 322 #define threadmask (sigmask(SIGILL)|sigmask(SIGTRAP)|\
 323                     sigmask(SIGIOT)|sigmask(SIGEMT)|\
 324                     sigmask(SIGFPE)|sigmask(SIGBUS)|\
 325                     sigmask(SIGSEGV)|sigmask(SIGSYS)|\
 326                     sigmask(SIGPIPE))
 327 #endif /* __APPLE_API_PRIVATE */
 328 #endif  /* KERNEL */
 329
 330 #define BADSIG          SIG_ERR
 331
 332 #endif  /* !_POSIX_SOURCE */
 333 #endif  /* !_ANSI_SOURCE */
 334
 335 /*
 336  * For historical reasons; programs expect signal's return value to be
 337  * defined by <sys/signal.h>.
 338  */
 339 __BEGIN_DECLS
 340 void    (*signal __P((int, void (*) __P((int))))) __P((int));
 341 __END_DECLS
 342 #endif  /* !_SYS_SIGNAL_H_ */