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 #include <machine/_mcontext.h>
 146
 147 #ifndef KERNEL
 148 #include <sys/_pthread/_pthread_attr_t.h>
 149 #endif /* KERNEL */
 150
 151 #include <sys/_types/_sigaltstack.h>
 152 #include <sys/_types/_ucontext.h>
 153
 154 #include <sys/_types/_pid_t.h>
 155 #include <sys/_types/_sigset_t.h>
 156 #include <sys/_types/_size_t.h>
 157 #include <sys/_types/_uid_t.h>
 158
 159 union sigval {
 160         /* Members as suggested by Annex C of POSIX 1003.1b. */
 161         int     sival_int;
 162         void    *sival_ptr;
 163 };
 164
 165 #define SIGEV_NONE      0       /* No async notification */
 166 #define SIGEV_SIGNAL    1       /* aio - completion notification */
 167 #define SIGEV_THREAD    3       /* [NOTIMP] [RTS] call notification function */
 168
 169 #ifndef KERNEL
 170 struct sigevent {
 171         int                             sigev_notify;                           /* Notification type */
 172         int                             sigev_signo;                            /* Signal number */
 173         union sigval    sigev_value;                            /* Signal value */
 174         void                    (*sigev_notify_function)(union sigval);   /* Notification function */
 175         pthread_attr_t  *sigev_notify_attributes;       /* Notification attributes */
 176 };
 177 #endif /* KERNEL */
 178
 179 #ifdef BSD_KERNEL_PRIVATE
 180
 181 union user64_sigval {
 182         struct {
 183                 uint32_t                pad;    /* assumes Motorola byte order */
 184                 int32_t                 sival_int;
 185         } size_equivalent;
 186         user64_addr_t   sival_ptr;
 187 };
 188
 189 union user32_sigval {
 190         /* Members as suggested by Annex C of POSIX 1003.1b. */
 191         int32_t sival_int;
 192         user32_addr_t sival_ptr;
 193 };
 194
 195 union user_sigval {
 196         struct {
 197                 uint32_t                pad;    /* assumes Motorola byte order */
 198                 int32_t                 sival_int;
 199         } size_equivalent;
 200         user_addr_t sival_ptr;
 201 };
 202
 203 struct user64_sigevent {
 204         int             sigev_notify;                   /* Notification type */
 205         int             sigev_signo;                    /* Signal number */
 206         union user64_sigval sigev_value;                        /* Signal value */
 207         user64_addr_t   sigev_notify_function;          /* Notify function */
 208         user64_addr_t   sigev_notify_attributes;        /* Notify attributes */
 209 };
 210
 211 struct user32_sigevent {
 212         int             sigev_notify;                   /* Notification type */
 213         int             sigev_signo;                    /* Signal number */
 214         union user32_sigval sigev_value;                        /* Signal value */
 215         user32_addr_t   sigev_notify_function;          /* Notify function */
 216         user32_addr_t   sigev_notify_attributes;        /* Notify attributes */
 217 };
 218
 219 struct user_sigevent {
 220         int             sigev_notify;                   /* Notification type */
 221         int             sigev_signo;                    /* Signal number */
 222         union user_sigval sigev_value;                  /* Signal value */
 223         user_addr_t     sigev_notify_function;          /* Notify function */
 224         user_addr_t     sigev_notify_attributes;        /* Notify attributes */
 225 };
 226
 227 #endif  /* BSD_KERNEL_PRIVATE */
 228
 229 typedef struct __siginfo {
 230         int     si_signo;               /* signal number */
 231         int     si_errno;               /* errno association */
 232         int     si_code;                /* signal code */
 233         pid_t   si_pid;                 /* sending process */
 234         uid_t   si_uid;                 /* sender's ruid */
 235         int     si_status;              /* exit value */
 236         void    *si_addr;               /* faulting instruction */
 237         union sigval si_value;          /* signal value */
 238         long    si_band;                /* band event for SIGPOLL */
 239         unsigned long   __pad[7];       /* Reserved for Future Use */
 240 } siginfo_t;
 241
 242 #ifdef BSD_KERNEL_PRIVATE
 243
 244 typedef struct user_siginfo {
 245         int             si_signo;       /* signal number */
 246         int             si_errno;       /* errno association */
 247         int             si_code;        /* signal code */
 248         pid_t           si_pid;         /* sending process */
 249         uid_t           si_uid;         /* sender's ruid */
 250         int             si_status;      /* exit value */
 251         user_addr_t     si_addr;        /* faulting instruction (see below) */
 252         union user_sigval si_value;     /* signal value */
 253         user_long_t     si_band;        /* band event for SIGPOLL */
 254         user_ulong_t    pad[7];         /* Reserved for Future Use */
 255 } user_siginfo_t;
 256
 257 typedef struct user64_siginfo {
 258         int             si_signo;       /* signal number */
 259         int             si_errno;       /* errno association */
 260         int             si_code;        /* signal code */
 261         pid_t           si_pid;         /* sending process */
 262         uid_t           si_uid;         /* sender's ruid */
 263         int             si_status;      /* exit value */
 264         user64_addr_t   si_addr;        /* faulting instruction (see below) */
 265         union user64_sigval si_value;   /* signal value */
 266         user64_long_t   si_band;        /* band event for SIGPOLL */
 267         user64_ulong_t  __pad[7];               /* Reserved for Future Use */
 268 } user64_siginfo_t;
 269
 270 typedef struct user32_siginfo {
 271         int             si_signo;       /* signal number */
 272         int             si_errno;       /* errno association */
 273         int             si_code;        /* signal code */
 274         pid_t           si_pid;         /* sending process */
 275         uid_t           si_uid;         /* sender's ruid */
 276         int             si_status;      /* exit value */
 277         user32_addr_t   si_addr;        /* faulting instruction (see below) */
 278         union user32_sigval     si_value;       /* signal value */
 279         user32_long_t   si_band;        /* band event for SIGPOLL */
 280         user32_ulong_t  __pad[7];               /* Reserved for Future Use */
 281 } user32_siginfo_t;
 282
 283 void siginfo_user_to_user32(user_siginfo_t *, user32_siginfo_t *);
 284 void siginfo_user_to_user64(user_siginfo_t *, user64_siginfo_t *);
 285
 286 #endif  /* BSD_KERNEL_PRIVATE */
 287
 288 /*
 289  * When the signal is SIGILL or SIGFPE, si_addr contains the address of
 290  * the faulting instruction.
 291  * When the signal is SIGSEGV or SIGBUS, si_addr contains the address of
 292  * the faulting memory reference. Although for x86 there are cases of SIGSEGV
 293  * for which si_addr cannot be determined and is NULL.
 294  * If the signal is SIGCHLD, the si_pid field will contain the child process ID,
 295  *  si_status contains the exit value or signal and
 296  *  si_uid contains the real user ID of the process that sent the signal.
 297  */
 298
 299 /* Values for si_code */
 300
 301 /* Codes for SIGILL */
 302 #if !defined(_POSIX_C_SOURCE) || defined(_DARWIN_C_SOURCE)
 303 #define ILL_NOOP        0       /* if only I knew... */
 304 #endif
 305 #define ILL_ILLOPC      1       /* [XSI] illegal opcode */
 306 #define ILL_ILLTRP      2       /* [XSI] illegal trap */
 307 #define ILL_PRVOPC      3       /* [XSI] privileged opcode */
 308 #define ILL_ILLOPN      4       /* [XSI] illegal operand -NOTIMP */
 309 #define ILL_ILLADR      5       /* [XSI] illegal addressing mode -NOTIMP */
 310 #define ILL_PRVREG      6       /* [XSI] privileged register -NOTIMP */
 311 #define ILL_COPROC      7       /* [XSI] coprocessor error -NOTIMP */
 312 #define ILL_BADSTK      8       /* [XSI] internal stack error -NOTIMP */
 313
 314 /* Codes for SIGFPE */
 315 #if !defined(_POSIX_C_SOURCE) || defined(_DARWIN_C_SOURCE)
 316 #define FPE_NOOP        0       /* if only I knew... */
 317 #endif
 318 #define FPE_FLTDIV      1       /* [XSI] floating point divide by zero */
 319 #define FPE_FLTOVF      2       /* [XSI] floating point overflow */
 320 #define FPE_FLTUND      3       /* [XSI] floating point underflow */
 321 #define FPE_FLTRES      4       /* [XSI] floating point inexact result */
 322 #define FPE_FLTINV      5       /* [XSI] invalid floating point operation */
 323 #define FPE_FLTSUB      6       /* [XSI] subscript out of range -NOTIMP */
 324 #define FPE_INTDIV      7       /* [XSI] integer divide by zero */
 325 #define FPE_INTOVF      8       /* [XSI] integer overflow */
 326
 327 /* Codes for SIGSEGV */
 328 #if !defined(_POSIX_C_SOURCE) || defined(_DARWIN_C_SOURCE)
 329 #define SEGV_NOOP       0       /* if only I knew... */
 330 #endif
 331 #define SEGV_MAPERR     1       /* [XSI] address not mapped to object */
 332 #define SEGV_ACCERR     2       /* [XSI] invalid permission for mapped object */
 333
 334 /* Codes for SIGBUS */
 335 #if !defined(_POSIX_C_SOURCE) || defined(_DARWIN_C_SOURCE)
 336 #define BUS_NOOP        0       /* if only I knew... */
 337 #endif
 338 #define BUS_ADRALN      1       /* [XSI] Invalid address alignment */
 339 #define BUS_ADRERR      2       /* [XSI] Nonexistent physical address -NOTIMP */
 340 #define BUS_OBJERR      3       /* [XSI] Object-specific HW error - NOTIMP */
 341
 342 /* Codes for SIGTRAP */
 343 #define TRAP_BRKPT      1       /* [XSI] Process breakpoint -NOTIMP */
 344 #define TRAP_TRACE      2       /* [XSI] Process trace trap -NOTIMP */
 345
 346 /* Codes for SIGCHLD */
 347 #if !defined(_POSIX_C_SOURCE) || defined(_DARWIN_C_SOURCE)
 348 #define CLD_NOOP        0       /* if only I knew... */
 349 #endif
 350 #define CLD_EXITED      1       /* [XSI] child has exited */
 351 #define CLD_KILLED      2       /* [XSI] terminated abnormally, no core file */
 352 #define CLD_DUMPED      3       /* [XSI] terminated abnormally, core file */
 353 #define CLD_TRAPPED     4       /* [XSI] traced child has trapped */
 354 #define CLD_STOPPED     5       /* [XSI] child has stopped */
 355 #define CLD_CONTINUED   6       /* [XSI] stopped child has continued */
 356
 357 /* Codes for SIGPOLL */
 358 #define POLL_IN         1       /* [XSR] Data input available */
 359 #define POLL_OUT        2       /* [XSR] Output buffers available */
 360 #define POLL_MSG        3       /* [XSR] Input message available */
 361 #define POLL_ERR        4       /* [XSR] I/O error */
 362 #define POLL_PRI        5       /* [XSR] High priority input available */
 363 #define POLL_HUP        6       /* [XSR] Device disconnected */
 364
 365 /* union for signal handlers */
 366 union __sigaction_u {
 367         void    (*__sa_handler)(int);
 368         void    (*__sa_sigaction)(int, struct __siginfo *,
 369                        void *);
 370 };
 371
 372 /* Signal vector template for Kernel user boundary */
 373 struct  __sigaction {
 374         union __sigaction_u __sigaction_u;  /* signal handler */
 375         void    (*sa_tramp)(void *, int, int, siginfo_t *, void *);
 376         sigset_t sa_mask;               /* signal mask to apply */
 377         int     sa_flags;               /* see signal options below */
 378 };
 379
 380 /*
 381  * Signal vector "template" used in sigaction call.
 382  */
 383 struct  sigaction {
 384         union __sigaction_u __sigaction_u;  /* signal handler */
 385         sigset_t sa_mask;               /* signal mask to apply */
 386         int     sa_flags;               /* see signal options below */
 387 };
 388
 389 #ifdef  BSD_KERNEL_PRIVATE
 390 #include <machine/types.h>
 391
 392 union __user32_sigaction_u {
 393         user32_addr_t __sa_handler;
 394         user32_addr_t __sa_sigaction;
 395 };
 396
 397 struct  user32_sigaction {
 398         union __user32_sigaction_u __sigaction_u;  /* signal handler */
 399         sigset_t sa_mask;               /* signal mask to apply */
 400         int     sa_flags;               /* see signal options below */
 401 };
 402
 403 struct  __user32_sigaction {
 404         union __user32_sigaction_u __sigaction_u;  /* signal handler */
 405         user32_addr_t sa_tramp;
 406         sigset_t sa_mask;               /* signal mask to apply */
 407         int     sa_flags;               /* see signal options below */
 408 };
 409
 410 union __user64_sigaction_u {
 411         user64_addr_t   __sa_handler;
 412         user64_addr_t   __sa_sigaction;
 413 };
 414
 415 struct  user64_sigaction {
 416         union __user64_sigaction_u __sigaction_u;  /* signal handler */
 417         sigset_t sa_mask;               /* signal mask to apply */
 418         int     sa_flags;               /* see signal options below */
 419 };
 420
 421 struct  __user64_sigaction {
 422         union __user64_sigaction_u __sigaction_u;  /* signal handler */
 423         user64_addr_t   sa_tramp;       /* signal mask to apply */
 424         sigset_t sa_mask;               /* signal mask to apply */
 425         int     sa_flags;               /* see signal options below */
 426 };
 427
 428 union __kern_sigaction_u {
 429         user_addr_t     __sa_handler;
 430         user_addr_t     __sa_sigaction;
 431 };
 432
 433 struct  kern_sigaction {
 434         union __kern_sigaction_u __sigaction_u;  /* signal handler */
 435         sigset_t sa_mask;               /* signal mask to apply */
 436         int     sa_flags;               /* see signal options below */
 437 };
 438
 439 struct  __kern_sigaction {
 440         union __kern_sigaction_u __sigaction_u;  /* signal handler */
 441         user_addr_t     sa_tramp;       /* signal mask to apply */
 442         sigset_t sa_mask;               /* signal mask to apply */
 443         int     sa_flags;               /* see signal options below */
 444 };
 445
 446 #undef SIG_DFL
 447 #undef SIG_IGN
 448 #undef SIG_ERR
 449 #define  SIG_DFL        ((user_addr_t)0LL)
 450 #define  SIG_IGN        ((user_addr_t)1LL)
 451 #define  SIG_ERR        ((user_addr_t)-1LL)
 452
 453 #endif  /* BSD_KERNEL_PRIVATE */
 454
 455
 456 /* if SA_SIGINFO is set, sa_sigaction is to be used instead of sa_handler. */
 457 #define sa_handler      __sigaction_u.__sa_handler
 458 #define sa_sigaction    __sigaction_u.__sa_sigaction
 459
 460 #define SA_ONSTACK      0x0001  /* take signal on signal stack */
 461 #define SA_RESTART      0x0002  /* restart system on signal return */
 462 #ifdef  BSD_KERNEL_PRIVATE
 463 #define SA_DISABLE      0x0004  /* disable taking signals on alternate stack - for user_sigaltstack.ss_flags only */
 464 #endif  /* BSD_KERNEL_PRIVATE */
 465 #define SA_RESETHAND    0x0004  /* reset to SIG_DFL when taking signal */
 466 #define SA_NOCLDSTOP    0x0008  /* do not generate SIGCHLD on child stop */
 467 #define SA_NODEFER      0x0010  /* don't mask the signal we're delivering */
 468 #define SA_NOCLDWAIT    0x0020  /* don't keep zombies around */
 469 #define SA_SIGINFO      0x0040  /* signal handler with SA_SIGINFO args */
 470 #if !defined(_POSIX_C_SOURCE) || defined(_DARWIN_C_SOURCE)
 471 #define SA_USERTRAMP    0x0100  /* do not bounce off kernel's sigtramp */
 472 /* This will provide 64bit register set in a 32bit user address space */
 473 #define SA_64REGSET     0x0200  /* signal handler with SA_SIGINFO args with 64bit regs information */
 474 #endif /* (!_POSIX_C_SOURCE || _DARWIN_C_SOURCE) */
 475
 476 /* the following are the only bits we support from user space, the
 477  * rest are for kernel use only.
 478  */
 479 #define SA_USERSPACE_MASK (SA_ONSTACK | SA_RESTART | SA_RESETHAND | SA_NOCLDSTOP | SA_NODEFER | SA_NOCLDWAIT | SA_SIGINFO)
 480
 481 /*
 482  * Flags for sigprocmask:
 483  */
 484 #define SIG_BLOCK       1       /* block specified signal set */
 485 #define SIG_UNBLOCK     2       /* unblock specified signal set */
 486 #define SIG_SETMASK     3       /* set specified signal set */
 487
 488 /* POSIX 1003.1b required values. */
 489 #define SI_USER         0x10001 /* [CX] signal from kill() */
 490 #define SI_QUEUE        0x10002 /* [CX] signal from sigqueue() */
 491 #define SI_TIMER        0x10003 /* [CX] timer expiration */
 492 #define SI_ASYNCIO      0x10004 /* [CX] aio request completion */
 493 #define SI_MESGQ        0x10005 /* [CX] from message arrival on empty queue */
 494
 495 #if !defined(_POSIX_C_SOURCE) || defined(_DARWIN_C_SOURCE)
 496 typedef void (*sig_t)(int);     /* type of signal function */
 497 #endif
 498
 499 /*
 500  * Structure used in sigaltstack call.
 501  */
 502 #ifdef  BSD_KERNEL_PRIVATE
 503
 504 struct  user32_sigaltstack {
 505         user32_addr_t   ss_sp;          /* signal stack base */
 506         user32_size_t   ss_size;        /* signal stack length */
 507         int                 ss_flags;   /* SA_DISABLE and/or SA_ONSTACK */
 508 };
 509
 510 struct  user64_sigaltstack {
 511         user64_addr_t   ss_sp;          /* signal stack base */
 512         user64_size_t   ss_size;        /* signal stack length */
 513         int             ss_flags;       /* SA_DISABLE and/or SA_ONSTACK */
 514 };
 515
 516 struct  kern_sigaltstack {
 517         user_addr_t     ss_sp;          /* signal stack base */
 518         user_size_t     ss_size;        /* signal stack length */
 519         int             ss_flags;       /* SA_DISABLE and/or SA_ONSTACK */
 520 };
 521
 522 #endif  /* BSD_KERNEL_PRIVATE */
 523
 524 #define SS_ONSTACK      0x0001  /* take signal on signal stack */
 525 #define SS_DISABLE      0x0004  /* disable taking signals on alternate stack */
 526 #define MINSIGSTKSZ     32768   /* (32K)minimum allowable stack */
 527 #define SIGSTKSZ        131072  /* (128K)recommended stack size */
 528
 529 #if !defined(_POSIX_C_SOURCE) || defined(_DARWIN_C_SOURCE)
 530 /*
 531  * 4.3 compatibility:
 532  * Signal vector "template" used in sigvec call.
 533  */
 534 struct  sigvec {
 535         void    (*sv_handler)(int);     /* signal handler */
 536         int     sv_mask;                /* signal mask to apply */
 537         int     sv_flags;               /* see signal options below */
 538 };
 539
 540 #define SV_ONSTACK      SA_ONSTACK
 541 #define SV_INTERRUPT    SA_RESTART      /* same bit, opposite sense */
 542 #define SV_RESETHAND    SA_RESETHAND
 543 #define SV_NODEFER      SA_NODEFER
 544 #define SV_NOCLDSTOP    SA_NOCLDSTOP
 545 #define SV_SIGINFO      SA_SIGINFO
 546
 547 #define sv_onstack sv_flags     /* isn't compatibility wonderful! */
 548 #endif /* (!_POSIX_C_SOURCE || _DARWIN_C_SOURCE) */
 549
 550 /*
 551  * Structure used in sigstack call.
 552  */
 553 struct  sigstack {
 554         char    *ss_sp;                 /* signal stack pointer */
 555         int     ss_onstack;             /* current status */
 556 };
 557
 558 #if !defined(_POSIX_C_SOURCE) || defined(_DARWIN_C_SOURCE)
 559 /*
 560  * Macro for converting signal number to a mask suitable for
 561  * sigblock().
 562  */
 563 #define sigmask(m)      (1 << ((m)-1))
 564
 565 #ifdef  KERNEL_PRIVATE
 566 /*
 567  *      signals delivered on a per-thread basis.
 568  */
 569 #define threadmask (sigmask(SIGILL)|sigmask(SIGTRAP)|\
 570                     sigmask(SIGIOT)|sigmask(SIGEMT)|\
 571                     sigmask(SIGFPE)|sigmask(SIGBUS)|\
 572                     sigmask(SIGSEGV)|sigmask(SIGSYS)|\
 573                     sigmask(SIGPIPE)|sigmask(SIGKILL))
 574
 575 #define workq_threadmask (threadmask | sigcantmask)
 576
 577 /*
 578  * Signals carried across exec.
 579  */
 580 #define execmask   (sigmask(SIGHUP)|sigmask(SIGINT)|\
 581                     sigmask(SIGQUIT)|sigmask(SIGKILL)|\
 582                     sigmask(SIGTERM)|sigmask(SIGSTOP)|\
 583                     sigmask(SIGTSTP)|sigmask(SIGCONT)|\
 584                     sigmask(SIGTTIN)|sigmask(SIGTTOU)|\
 585                     sigmask(SIGUSR1)|sigmask(SIGUSR2))
 586
 587 #endif  /* KERNEL_PRIVATE */
 588
 589 #define BADSIG          SIG_ERR
 590
 591 #endif  /* (!_POSIX_C_SOURCE || _DARWIN_C_SOURCE) */
 592 #endif  /* !_ANSI_SOURCE */
 593
 594 /*
 595  * For historical reasons; programs expect signal's return value to be
 596  * defined by <sys/signal.h>.
 597  */
 598 __BEGIN_DECLS
 599 void    (*signal(int, void (*)(int)))(int);
 600 __END_DECLS
 601 #endif  /* !_SYS_SIGNAL_H_ */