bsd/sys/signal.h

   1 /*
   2  * Copyright (c) 2000-2006 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, 1991, 1993
  31  *      The Regents of the University of California.  All rights reserved.
  32  * (c) UNIX System Laboratories, Inc.
  33  * All or some portions of this file are derived from material licensed
  34  * to the University of California by American Telephone and Telegraph
  35  * Co. or Unix System Laboratories, Inc. and are reproduced herein with
  36  * the permission of UNIX System Laboratories, Inc.
  37  *
  38  * Redistribution and use in source and binary forms, with or without
  39  * modification, are permitted provided that the following conditions
  40  * are met:
  41  * 1. Redistributions of source code must retain the above copyright
  42  *    notice, this list of conditions and the following disclaimer.
  43  * 2. Redistributions in binary form must reproduce the above copyright
  44  *    notice, this list of conditions and the following disclaimer in the
  45  *    documentation and/or other materials provided with the distribution.
  46  * 3. All advertising materials mentioning features or use of this software
  47  *    must display the following acknowledgement:
  48  *      This product includes software developed by the University of
  49  *      California, Berkeley and its contributors.
  50  * 4. Neither the name of the University nor the names of its contributors
  51  *    may be used to endorse or promote products derived from this software
  52  *    without specific prior written permission.
  53  *
  54  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  55  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  56  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  57  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  58  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  59  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  60  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  61  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  62  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  63  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  64  * SUCH DAMAGE.
  65  *
  66  *      @(#)signal.h    8.2 (Berkeley) 1/21/94
  67  */
  68
  69 #ifndef _SYS_SIGNAL_H_
  70 #define _SYS_SIGNAL_H_
  71
  72 #include <sys/cdefs.h>
  73 #include <sys/appleapiopts.h>
  74
  75 #define __DARWIN_NSIG   32      /* counting 0; could be 33 (mask is 1-32) */
  76
  77 #if !defined(_ANSI_SOURCE) && (!defined(_POSIX_C_SOURCE) || defined(_DARWIN_C_SOURCE))
  78 #define NSIG    __DARWIN_NSIG
  79 #endif
  80
  81 #include <machine/signal.h>     /* sigcontext; codes for SIGILL, SIGFPE */
  82
  83 #define SIGHUP  1       /* hangup */
  84 #define SIGINT  2       /* interrupt */
  85 #define SIGQUIT 3       /* quit */
  86 #define SIGILL  4       /* illegal instruction (not reset when caught) */
  87 #define SIGTRAP 5       /* trace trap (not reset when caught) */
  88 #define SIGABRT 6       /* abort() */
  89 #if  (defined(_POSIX_C_SOURCE) && !defined(_DARWIN_C_SOURCE))
  90 #define SIGPOLL 7       /* pollable event ([XSR] generated, not supported) */
  91 #else   /* (!_POSIX_C_SOURCE || _DARWIN_C_SOURCE) */
  92 #define SIGIOT  SIGABRT /* compatibility */
  93 #define SIGEMT  7       /* EMT instruction */
  94 #endif  /* (!_POSIX_C_SOURCE || _DARWIN_C_SOURCE) */
  95 #define SIGFPE  8       /* floating point exception */
  96 #define SIGKILL 9       /* kill (cannot be caught or ignored) */
  97 #define SIGBUS  10      /* bus error */
  98 #define SIGSEGV 11      /* segmentation violation */
  99 #define SIGSYS  12      /* bad argument to system call */
 100 #define SIGPIPE 13      /* write on a pipe with no one to read it */
 101 #define SIGALRM 14      /* alarm clock */
 102 #define SIGTERM 15      /* software termination signal from kill */
 103 #define SIGURG  16      /* urgent condition on IO channel */
 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_C_SOURCE) || defined(_DARWIN_C_SOURCE))
 111 #define SIGIO   23      /* input/output possible signal */
 112 #endif
 113 #define SIGXCPU 24      /* exceeded CPU time limit */
 114 #define SIGXFSZ 25      /* exceeded file size limit */
 115 #define SIGVTALRM 26    /* virtual time alarm */
 116 #define SIGPROF 27      /* profiling time alarm */
 117 #if  (!defined(_POSIX_C_SOURCE) || defined(_DARWIN_C_SOURCE))
 118 #define SIGWINCH 28     /* window size changes */
 119 #define SIGINFO 29      /* information request */
 120 #endif
 121 #define SIGUSR1 30      /* user defined signal 1 */
 122 #define SIGUSR2 31      /* user defined signal 2 */
 123
 124 #if defined(_ANSI_SOURCE) || __DARWIN_UNIX03 || defined(__cplusplus)
 125 /*
 126  * Language spec sez we must list exactly one parameter, even though we
 127  * actually supply three.  Ugh!
 128  * SIG_HOLD is chosen to avoid KERN_SIG_* values in <sys/signalvar.h>
 129  */
 130 #define SIG_DFL         (void (*)(int))0
 131 #define SIG_IGN         (void (*)(int))1
 132 #define SIG_HOLD        (void (*)(int))5
 133 #define SIG_ERR         ((void (*)(int))-1)
 134 #else
 135 /* DO NOT REMOVE THE COMMENTED OUT int: fixincludes needs to see them */
 136 #define SIG_DFL         (void (*)(/*int*/))0
 137 #define SIG_IGN         (void (*)(/*int*/))1
 138 #define SIG_HOLD        (void (*)(/*int*/))5
 139 #define SIG_ERR         ((void (*)(/*int*/))-1)
 140 #endif
 141
 142 #ifndef _ANSI_SOURCE
 143 #include <sys/_types.h>
 144
 145 #define __need_mcontext_t
 146 #define __need_stack_t
 147 #define __need_ucontext_t
 148 #if !defined(_POSIX_C_SOURCE) || defined(_DARWIN_C_SOURCE)
 149 #if defined(__ppc__) || defined(__ppc64__)
 150 #define __need_mcontext64_t
 151 #define __need_ucontext64_t
 152 #endif /* __ppc__  || __ppc64__ */
 153 #endif /* (_POSIX_C_SOURCE && !_DARWIN_C_SOURCE) */
 154 #include <sys/_structs.h>
 155
 156 #ifndef _PID_T
 157 #define _PID_T
 158 typedef __darwin_pid_t                  pid_t;
 159 #endif
 160
 161 #ifndef _PTHREAD_ATTR_T
 162 #define _PTHREAD_ATTR_T
 163 typedef __darwin_pthread_attr_t         pthread_attr_t;
 164 #endif
 165
 166 #ifndef _SIGSET_T
 167 #define _SIGSET_T
 168 typedef __darwin_sigset_t               sigset_t;
 169 #endif
 170
 171 #ifndef _SIZE_T
 172 #define _SIZE_T
 173 typedef __darwin_size_t                 size_t;
 174 #endif
 175
 176 #ifndef _UID_T
 177 #define _UID_T
 178 typedef __darwin_uid_t                  uid_t;
 179 #endif
 180
 181 union sigval {
 182         /* Members as suggested by Annex C of POSIX 1003.1b. */
 183         int     sival_int;
 184         void    *sival_ptr;
 185 };
 186
 187 #define SIGEV_NONE      0               /* No async notification */
 188 #define SIGEV_SIGNAL    1               /* aio - completion notification */
 189 #define SIGEV_THREAD    3               /* A notification function will be called to perform notification */
 190
 191 struct sigevent {
 192         int                             sigev_notify;                           /* Notification type */
 193         int                             sigev_signo;                            /* Signal number */
 194         union sigval    sigev_value;                            /* Signal value */
 195         void                    (*sigev_notify_function)(union sigval);   /* Notification function */
 196         pthread_attr_t  *sigev_notify_attributes;       /* Notification attributes */
 197 };
 198
 199 #ifdef BSD_KERNEL_PRIVATE
 200
 201 union user_sigval {
 202         struct {
 203                 int             pad;    /* assumes Motorolla byte order */
 204                 int             sival_int;
 205         } size_equivalent;
 206         user_addr_t     sival_ptr;
 207 };
 208
 209 struct user_sigevent {
 210         int             sigev_notify;                   /* Notification type */
 211         int             sigev_signo;                    /* Signal number */
 212         union user_sigval sigev_value;                  /* Signal value */
 213         user_addr_t     sigev_notify_function;          /* Notify function */
 214         user_addr_t     sigev_notify_attributes;        /* Notify attributes */
 215 };
 216
 217 #endif  /* BSD_KERNEL_PRIVATE */
 218
 219 typedef struct __siginfo {
 220         int     si_signo;               /* signal number */
 221         int     si_errno;               /* errno association */
 222         int     si_code;                /* signal code */
 223         pid_t   si_pid;                 /* sending process */
 224         uid_t   si_uid;                 /* sender's ruid */
 225         int     si_status;              /* exit value */
 226         void    *si_addr;               /* faulting instruction */
 227         union sigval si_value;          /* signal value */
 228         long    si_band;                /* band event for SIGPOLL */
 229         unsigned long   __pad[7];       /* Reserved for Future Use */
 230 } siginfo_t;
 231
 232 #ifdef BSD_KERNEL_PRIVATE
 233
 234 typedef struct __user_siginfo {
 235         int             si_signo;       /* signal number */
 236         int             si_errno;       /* errno association */
 237         int             si_code;        /* signal code */
 238         pid_t           si_pid;         /* sending process */
 239         uid_t           si_uid;         /* sender's ruid */
 240         int             si_status;      /* exit value */
 241         user_addr_t     si_addr;        /* faulting instruction (see below) */
 242         union user_sigval si_value;     /* signal value */
 243         user_long_t     si_band;        /* band event for SIGPOLL */
 244         user_ulong_t    pad[7];         /* Reserved for Future Use */
 245 } user_siginfo_t;
 246
 247 #endif  /* BSD_KERNEL_PRIVATE */
 248
 249 /*
 250  * When the signal is SIGILL or SIGFPE, si_addr contains the address of
 251  * the faulting instruction.
 252  * When the signal is SIGSEGV or SIGBUS, si_addr contains the address of
 253  * the faulting memory reference. Although for x86 there are cases of SIGSEGV
 254  * for which si_addr cannot be determined and is NULL.
 255  * If the signal is SIGCHLD, the si_pid field will contain the child process ID,
 256  *  si_status contains the exit value or signal and
 257  *  si_uid contains the real user ID of the process that sent the signal.
 258  */
 259
 260 /* Values for si_code */
 261
 262 /* Codes for SIGILL */
 263 #if !defined(_POSIX_C_SOURCE) || defined(_DARWIN_C_SOURCE)
 264 #define ILL_NOOP        0       /* if only I knew... */
 265 #endif
 266 #define ILL_ILLOPC      1       /* [XSI] illegal opcode */
 267 #define ILL_ILLTRP      2       /* [XSI] illegal trap */
 268 #define ILL_PRVOPC      3       /* [XSI] privileged opcode */
 269 #define ILL_ILLOPN      4       /* [XSI] illegal operand -NOTIMP */
 270 #define ILL_ILLADR      5       /* [XSI] illegal addressing mode -NOTIMP */
 271 #define ILL_PRVREG      6       /* [XSI] privileged register -NOTIMP */
 272 #define ILL_COPROC      7       /* [XSI] coprocessor error -NOTIMP */
 273 #define ILL_BADSTK      8       /* [XSI] internal stack error -NOTIMP */
 274
 275 /* Codes for SIGFPE */
 276 #if !defined(_POSIX_C_SOURCE) || defined(_DARWIN_C_SOURCE)
 277 #define FPE_NOOP        0       /* if only I knew... */
 278 #endif
 279 #define FPE_FLTDIV      1       /* [XSI] floating point divide by zero */
 280 #define FPE_FLTOVF      2       /* [XSI] floating point overflow */
 281 #define FPE_FLTUND      3       /* [XSI] floating point underflow */
 282 #define FPE_FLTRES      4       /* [XSI] floating point inexact result */
 283 #define FPE_FLTINV      5       /* [XSI] invalid floating point operation */
 284 #define FPE_FLTSUB      6       /* [XSI] subscript out of range -NOTIMP */
 285 #define FPE_INTDIV      7       /* [XSI] integer divide by zero -NOTIMP */
 286 #define FPE_INTOVF      8       /* [XSI] integer overflow -NOTIMP */
 287
 288 /* Codes for SIGSEGV */
 289 #if !defined(_POSIX_C_SOURCE) || defined(_DARWIN_C_SOURCE)
 290 #define SEGV_NOOP       0       /* if only I knew... */
 291 #endif
 292 #define SEGV_MAPERR     1       /* [XSI] address not mapped to object */
 293 #define SEGV_ACCERR     2       /* [XSI] invalid permission for mapped object */
 294
 295 /* Codes for SIGBUS */
 296 #if !defined(_POSIX_C_SOURCE) || defined(_DARWIN_C_SOURCE)
 297 #define BUS_NOOP        0       /* if only I knew... */
 298 #endif
 299 #define BUS_ADRALN      1       /* [XSI] Invalid address alignment */
 300 #define BUS_ADRERR      2       /* [XSI] Nonexistent physical address -NOTIMP */
 301 #define BUS_OBJERR      3       /* [XSI] Object-specific HW error - NOTIMP */
 302
 303 /* Codes for SIGTRAP */
 304 #define TRAP_BRKPT      1       /* [XSI] Process breakpoint -NOTIMP */
 305 #define TRAP_TRACE      2       /* [XSI] Process trace trap -NOTIMP */
 306
 307 /* Codes for SIGCHLD */
 308 #if !defined(_POSIX_C_SOURCE) || defined(_DARWIN_C_SOURCE)
 309 #define CLD_NOOP        0       /* if only I knew... */
 310 #endif
 311 #define CLD_EXITED      1       /* [XSI] child has exited */
 312 #define CLD_KILLED      2       /* [XSI] terminated abnormally, no core file */
 313 #define CLD_DUMPED      3       /* [XSI] terminated abnormally, core file */
 314 #define CLD_TRAPPED     4       /* [XSI] traced child has trapped */
 315 #define CLD_STOPPED     5       /* [XSI] child has stopped */
 316 #define CLD_CONTINUED   6       /* [XSI] stopped child has continued */
 317
 318 /* Codes for SIGPOLL */
 319 #define POLL_IN         1       /* [XSR] Data input available */
 320 #define POLL_OUT        2       /* [XSR] Output buffers available */
 321 #define POLL_MSG        3       /* [XSR] Input message available */
 322 #define POLL_ERR        4       /* [XSR] I/O error */
 323 #define POLL_PRI        5       /* [XSR] High priority input available */
 324 #define POLL_HUP        6       /* [XSR] Device disconnected */
 325
 326 /* union for signal handlers */
 327 union __sigaction_u {
 328         void    (*__sa_handler)(int);
 329         void    (*__sa_sigaction)(int, struct __siginfo *,
 330                        void *);
 331 };
 332
 333 /* Signal vector template for Kernel user boundary */
 334 struct  __sigaction {
 335         union __sigaction_u __sigaction_u;  /* signal handler */
 336         void    (*sa_tramp)(void *, int, int, siginfo_t *, void *);
 337         sigset_t sa_mask;               /* signal mask to apply */
 338         int     sa_flags;               /* see signal options below */
 339 };
 340
 341 /*
 342  * Signal vector "template" used in sigaction call.
 343  */
 344 struct  sigaction {
 345         union __sigaction_u __sigaction_u;  /* signal handler */
 346         sigset_t sa_mask;               /* signal mask to apply */
 347         int     sa_flags;               /* see signal options below */
 348 };
 349
 350 #ifdef  BSD_KERNEL_PRIVATE
 351 #include <machine/types.h>
 352
 353 union __user_sigaction_u {
 354         user_addr_t     __sa_handler;
 355         user_addr_t     __sa_sigaction;
 356 };
 357
 358 struct  user_sigaction {
 359         union __user_sigaction_u __sigaction_u;  /* signal handler */
 360         sigset_t sa_mask;               /* signal mask to apply */
 361         int     sa_flags;               /* see signal options below */
 362 };
 363
 364 struct  __user_sigaction {
 365         union __user_sigaction_u __sigaction_u;  /* signal handler */
 366         user_addr_t     sa_tramp;       /* signal mask to apply */
 367         sigset_t sa_mask;               /* signal mask to apply */
 368         int     sa_flags;               /* see signal options below */
 369 };
 370
 371 #undef SIG_DFL
 372 #undef SIG_IGN
 373 #undef SIG_ERR
 374 #define  SIG_DFL        ((user_addr_t)0LL)
 375 #define  SIG_IGN        ((user_addr_t)1LL)
 376 #define  SIG_ERR        ((user_addr_t)-1LL)
 377
 378 #endif  /* BSD_KERNEL_PRIVATE */
 379
 380
 381 /* if SA_SIGINFO is set, sa_sigaction is to be used instead of sa_handler. */
 382 #define sa_handler      __sigaction_u.__sa_handler
 383 #define sa_sigaction    __sigaction_u.__sa_sigaction
 384
 385 #define SA_ONSTACK      0x0001  /* take signal on signal stack */
 386 #define SA_RESTART      0x0002  /* restart system on signal return */
 387 #ifdef  BSD_KERNEL_PRIVATE
 388 #define SA_DISABLE      0x0004  /* disable taking signals on alternate stack - for user_sigaltstack.ss_flags only */
 389 #endif  /* BSD_KERNEL_PRIVATE */
 390 #define SA_RESETHAND    0x0004  /* reset to SIG_DFL when taking signal */
 391 #define SA_NOCLDSTOP    0x0008  /* do not generate SIGCHLD on child stop */
 392 #define SA_NODEFER      0x0010  /* don't mask the signal we're delivering */
 393 #define SA_NOCLDWAIT    0x0020  /* don't keep zombies around */
 394 #define SA_SIGINFO      0x0040  /* signal handler with SA_SIGINFO args */
 395 #if !defined(_POSIX_C_SOURCE) || defined(_DARWIN_C_SOURCE)
 396 #define SA_USERTRAMP    0x0100  /* do not bounce off kernel's sigtramp */
 397 /* This will provide 64bit register set in a 32bit user address space */
 398 #define SA_64REGSET     0x0200  /* signal handler with SA_SIGINFO args with 64bit regs information */
 399 #endif /* (!_POSIX_C_SOURCE || _DARWIN_C_SOURCE) */
 400
 401 /* the following are the only bits we support from user space, the
 402  * rest are for kernel use only.
 403  */
 404 #define SA_USERSPACE_MASK (SA_ONSTACK | SA_RESTART | SA_RESETHAND | SA_NOCLDSTOP | SA_NODEFER | SA_NOCLDWAIT | SA_SIGINFO)
 405
 406 /*
 407  * Flags for sigprocmask:
 408  */
 409 #define SIG_BLOCK       1       /* block specified signal set */
 410 #define SIG_UNBLOCK     2       /* unblock specified signal set */
 411 #define SIG_SETMASK     3       /* set specified signal set */
 412
 413 /* POSIX 1003.1b required values. */
 414 #define SI_USER         0x10001 /* [CX] signal from kill() */
 415 #define SI_QUEUE        0x10002 /* [CX] signal from sigqueue() */
 416 #define SI_TIMER        0x10003 /* [CX] timer expiration */
 417 #define SI_ASYNCIO      0x10004 /* [CX] aio request completion */
 418 #define SI_MESGQ        0x10005 /* [CX] from message arrival on empty queue */
 419
 420 #if !defined(_POSIX_C_SOURCE) || defined(_DARWIN_C_SOURCE)
 421 typedef void (*sig_t)(int);     /* type of signal function */
 422 #endif
 423
 424 /*
 425  * Structure used in sigaltstack call.
 426  */
 427 #ifdef  BSD_KERNEL_PRIVATE
 428
 429 struct  user_sigaltstack {
 430         user_addr_t     ss_sp;          /* signal stack base */
 431         user_size_t     ss_size;        /* signal stack length */
 432         int             ss_flags __attribute((aligned(8)));     /* SA_DISABLE and/or SA_ONSTACK */
 433 };
 434
 435 #endif  /* BSD_KERNEL_PRIVATE */
 436
 437 #define SS_ONSTACK      0x0001  /* take signal on signal stack */
 438 #define SS_DISABLE      0x0004  /* disable taking signals on alternate stack */
 439 #define MINSIGSTKSZ     32768   /* (32K)minimum allowable stack */
 440 #define SIGSTKSZ        131072  /* (128K)recommended stack size */
 441
 442 #if !defined(_POSIX_C_SOURCE) || defined(_DARWIN_C_SOURCE)
 443 /*
 444  * 4.3 compatibility:
 445  * Signal vector "template" used in sigvec call.
 446  */
 447 struct  sigvec {
 448         void    (*sv_handler)(int);     /* signal handler */
 449         int     sv_mask;                /* signal mask to apply */
 450         int     sv_flags;               /* see signal options below */
 451 };
 452
 453 #define SV_ONSTACK      SA_ONSTACK
 454 #define SV_INTERRUPT    SA_RESTART      /* same bit, opposite sense */
 455 #define SV_RESETHAND    SA_RESETHAND
 456 #define SV_NODEFER      SA_NODEFER
 457 #define SV_NOCLDSTOP    SA_NOCLDSTOP
 458 #define SV_SIGINFO      SA_SIGINFO
 459
 460 #define sv_onstack sv_flags     /* isn't compatibility wonderful! */
 461 #endif /* (!_POSIX_C_SOURCE || _DARWIN_C_SOURCE) */
 462
 463 /*
 464  * Structure used in sigstack call.
 465  */
 466 struct  sigstack {
 467         char    *ss_sp;                 /* signal stack pointer */
 468         int     ss_onstack;             /* current status */
 469 };
 470
 471 #if !defined(_POSIX_C_SOURCE) || defined(_DARWIN_C_SOURCE)
 472 /*
 473  * Macro for converting signal number to a mask suitable for
 474  * sigblock().
 475  */
 476 #define sigmask(m)      (1 << ((m)-1))
 477
 478 #ifdef  BSD_KERNEL_PRIVATE
 479 /*
 480  *      signals delivered on a per-thread basis.
 481  */
 482 #define threadmask (sigmask(SIGILL)|sigmask(SIGTRAP)|\
 483                     sigmask(SIGIOT)|sigmask(SIGEMT)|\
 484                     sigmask(SIGFPE)|sigmask(SIGBUS)|\
 485                     sigmask(SIGSEGV)|sigmask(SIGSYS)|\
 486                     sigmask(SIGPIPE))
 487 #endif  /* BSD_KERNEL_PRIVATE */
 488
 489 #define BADSIG          SIG_ERR
 490
 491 #endif  /* (!_POSIX_C_SOURCE || _DARWIN_C_SOURCE) */
 492 #endif  /* !_ANSI_SOURCE */
 493
 494 /*
 495  * For historical reasons; programs expect signal's return value to be
 496  * defined by <sys/signal.h>.
 497  */
 498 __BEGIN_DECLS
 499 void    (*signal(int, void (*)(int)))(int);
 500 __END_DECLS
 501 #endif  /* !_SYS_SIGNAL_H_ */