sys/sys/signal.h

   1 /*
   2  * Copyright (c) 1982, 1986, 1989, 1991, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  * (c) UNIX System Laboratories, Inc.
   5  * All or some portions of this file are derived from material licensed
   6  * to the University of California by American Telephone and Telegraph
   7  * Co. or Unix System Laboratories, Inc. and are reproduced herein with
   8  * the permission of UNIX System Laboratories, Inc.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  * 3. All advertising materials mentioning features or use of this software
  19  *    must display the following acknowledgement:
  20  *      This product includes software developed by the University of
  21  *      California, Berkeley and its contributors.
  22  * 4. Neither the name of the University nor the names of its contributors
  23  *    may be used to endorse or promote products derived from this software
  24  *    without specific prior written permission.
  25  *
  26  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  27  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  28  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  29  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  30  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  31  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  32  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  33  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  34  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  35  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  36  * SUCH DAMAGE.
  37  *
  38  *      @(#)signal.h    8.4 (Berkeley) 5/4/95
  39  * $FreeBSD: src/sys/sys/signal.h,v 1.23.2.2 2001/04/19 01:38:35 alfred Exp $
  40  * $DragonFly: src/sys/sys/signal.h,v 1.6 2007/01/14 07:59:08 dillon Exp $
  41  */
  42
  43 #ifndef _SYS_SIGNAL_H_
  44 #define _SYS_SIGNAL_H_
  45
  46 #ifndef _MACHINE_STDINT_H_
  47 #include <machine/stdint.h>     /* for __ types */
  48 #endif
  49 #include <sys/cdefs.h>
  50 #include <sys/_posix.h>
  51
  52 /*
  53  * sigset_t macros.
  54  */
  55 #define _SIG_WORDS      4
  56 #define _SIG_MAXSIG     128
  57 #define _SIG_IDX(sig)   ((sig) - 1)
  58 #define _SIG_WORD(sig)  (_SIG_IDX(sig) >> 5)
  59 #define _SIG_BIT(sig)   (1 << (_SIG_IDX(sig) & 31))
  60 #define _SIG_VALID(sig) ((sig) < _SIG_MAXSIG && (sig) > 0)
  61
  62 /*
  63  * System defined signals.
  64  */
  65 #define SIGHUP          1       /* hangup */
  66 #define SIGINT          2       /* interrupt */
  67 #define SIGQUIT         3       /* quit */
  68 #define SIGILL          4       /* illegal instr. (not reset when caught) */
  69 #ifndef _POSIX_SOURCE
  70 #define SIGTRAP         5       /* trace trap (not reset when caught) */
  71 #endif
  72 #define SIGABRT         6       /* abort() */
  73 #ifndef _POSIX_SOURCE
  74 #define SIGIOT          SIGABRT /* compatibility */
  75 #define SIGEMT          7       /* EMT instruction */
  76 #endif
  77 #define SIGFPE          8       /* floating point exception */
  78 #define SIGKILL         9       /* kill (cannot be caught or ignored) */
  79 #ifndef _POSIX_SOURCE
  80 #define SIGBUS          10      /* bus error */
  81 #endif
  82 #define SIGSEGV         11      /* segmentation violation */
  83 #ifndef _POSIX_SOURCE
  84 #define SIGSYS          12      /* non-existent system call invoked */
  85 #endif
  86 #define SIGPIPE         13      /* write on a pipe with no one to read it */
  87 #define SIGALRM         14      /* alarm clock */
  88 #define SIGTERM         15      /* software termination signal from kill */
  89 #ifndef _POSIX_SOURCE
  90 #define SIGURG          16      /* urgent condition on IO channel */
  91 #endif
  92 #define SIGSTOP         17      /* sendable stop signal not from tty */
  93 #define SIGTSTP         18      /* stop signal from tty */
  94 #define SIGCONT         19      /* continue a stopped process */
  95 #define SIGCHLD         20      /* to parent on child stop or exit */
  96 #define SIGTTIN         21      /* to readers pgrp upon background tty read */
  97 #define SIGTTOU         22      /* like TTIN if (tp->t_local&LTOSTOP) */
  98 #ifndef _POSIX_SOURCE
  99 #define SIGIO           23      /* input/output possible signal */
 100 #define SIGXCPU         24      /* exceeded CPU time limit */
 101 #define SIGXFSZ         25      /* exceeded file size limit */
 102 #define SIGVTALRM       26      /* virtual time alarm */
 103 #define SIGPROF         27      /* profiling time alarm */
 104 #define SIGWINCH        28      /* window size changes */
 105 #define SIGINFO         29      /* information request */
 106 #endif
 107 #define SIGUSR1         30      /* user defined signal 1 */
 108 #define SIGUSR2         31      /* user defined signal 2 */
 109 #if __BSD_VISIBLE
 110 #define SIGTHR          32      /* Thread interrupt (FreeBSD-5 reserved) */
 111 #define SIGCKPT         33      /* checkpoint and continue */
 112 #define SIGCKPTEXIT     34      /* checkpoint and exit */
 113 #endif
 114
 115 /*-
 116  * Type of a signal handling function.
 117  *
 118  * Language spec sez signal handlers take exactly one arg, even though we
 119  * actually supply three.  Ugh!
 120  *
 121  * We don't try to hide the difference by leaving out the args because
 122  * that would cause warnings about conformant programs.  Nonconformant
 123  * programs can avoid the warnings by casting to (__sighandler_t *) or
 124  * sig_t before calling signal() or assigning to sa_handler or sv_handler.
 125  *
 126  * The kernel should reverse the cast before calling the function.  It
 127  * has no way to do this, but on most machines 1-arg and 3-arg functions
 128  * have the same calling protocol so there is no problem in practice.
 129  * A bit in sa_flags could be used to specify the number of args.
 130  *
 131  * SIG_EINTR causes system calls to interrupt but generates no signal
 132  * delivery.  The caller is responsible for polling the event.
 133  */
 134 typedef void __sighandler_t (int);
 135
 136 #define SIG_DFL         ((__sighandler_t *)0)
 137 #define SIG_IGN         ((__sighandler_t *)1)
 138 #define SIG_ERR         ((__sighandler_t *)-1)
 139
 140 #if defined(_P1003_1B_VISIBLE) || defined(_KERNEL)
 141 union sigval {
 142         /* Members as suggested by Annex C of POSIX 1003.1b. */
 143         int     sigval_int;
 144         void    *sigval_ptr;
 145 };
 146
 147 struct sigevent {
 148         int     sigev_notify;           /* Notification type */
 149         union {
 150                 int     __sigev_signo;  /* Signal number */
 151                 int     __sigev_notify_kqueue;
 152         } __sigev_u;
 153         union sigval sigev_value;       /* Signal value */
 154 };
 155 #define sigev_signo             __sigev_u.__sigev_signo
 156 #define sigev_notify_kqueue     __sigev_u.__sigev_notify_kqueue
 157
 158 #define SIGEV_NONE      0               /* No async notification */
 159 #define SIGEV_SIGNAL    1               /* Generate a queued signal */
 160 #define SIGEV_KEVENT    3               /* Generate a kevent */
 161
 162 typedef struct __siginfo {
 163         int     si_signo;               /* signal number */
 164         int     si_errno;               /* errno association */
 165         /*
 166          * Cause of signal, one of the SI_ macros or signal-specific
 167          * values, i.e. one of the FPE_... values for SIGFPE. This
 168          * value is equivalent to the second argument to an old-style
 169          * FreeBSD signal handler.
 170          */
 171         int     si_code;                /* signal code */
 172         int     si_pid;                 /* sending process */
 173         unsigned int si_uid;            /* sender's ruid */
 174         int     si_status;              /* exit value */
 175         void    *si_addr;               /* faulting instruction */
 176         union sigval si_value;          /* signal value */
 177         long    si_band;                /* band event for SIGPOLL */
 178         int     __spare__[7];           /* gimme some slack */
 179 } siginfo_t;
 180 #endif /* _P1003_1B_VISIBLE */
 181
 182 typedef struct __sigset {
 183         unsigned int    __bits[_SIG_WORDS];
 184 } sigset_t;
 185
 186 /*
 187  * XXX - there are some nasty dependencies on include file order. Now that
 188  * sigset_t has been defined we can include the MD header.
 189  */
 190 #include <machine/signal.h>     /* sig_atomic_t; trap codes; sigcontext */
 191
 192 #if !defined(_ANSI_SOURCE)
 193
 194 struct __siginfo;
 195
 196 /*
 197  * Signal vector "template" used in sigaction call.
 198  */
 199 struct  sigaction {
 200         union {
 201                 void    (*__sa_handler) (int);
 202                 void    (*__sa_sigaction) (int, struct __siginfo *, void *);
 203                 int     *__sa_mailbox;
 204         } __sigaction_u;                /* signal handler */
 205         int     sa_flags;               /* see signal options below */
 206         sigset_t sa_mask;               /* signal mask to apply */
 207 };
 208
 209 /* if SA_SIGINFO is set, sa_sigaction is to be used instead of sa_handler. */
 210 #define sa_handler      __sigaction_u.__sa_handler
 211
 212 #define SA_NOCLDSTOP    0x0008  /* do not generate SIGCHLD on child stop */
 213
 214 #if !defined(_POSIX_SOURCE)
 215
 216 #define sa_sigaction    __sigaction_u.__sa_sigaction
 217 #define sa_mailbox      __sigaction_u.__sa_mailbox
 218
 219 #define SA_ONSTACK      0x0001  /* take signal on signal stack */
 220 #define SA_RESTART      0x0002  /* restart system call on signal return */
 221 #define SA_RESETHAND    0x0004  /* reset to SIG_DFL when taking signal */
 222 #define SA_NODEFER      0x0010  /* don't mask the signal we're delivering */
 223 #define SA_NOCLDWAIT    0x0020  /* don't keep zombies around */
 224 #define SA_SIGINFO      0x0040  /* signal handler with SA_SIGINFO args */
 225 #ifdef COMPAT_SUNOS
 226 #define SA_USERTRAMP    0x0100  /* do not bounce off kernel's sigtramp */
 227 #endif
 228 #define SA_MAILBOX      0x1000  /* store to mailbox */
 229
 230 #define NSIG            64      /* size of sigptbl */
 231
 232 /* POSIX 1003.1b required values. */
 233 #define SI_USER         0x10001
 234 #define SI_QUEUE        0x10002
 235 #define SI_TIMER        0x10003
 236 #define SI_ASYNCIO      0x10004
 237 #define SI_MESGQ        0x10005
 238
 239 /* Additional FreeBSD values. */
 240 #define SI_UNDEFINED    0
 241
 242 typedef void __siginfohandler_t (int, struct __siginfo *, void *);
 243
 244 typedef __sighandler_t  *sig_t; /* type of pointer to a signal function */
 245
 246 /*
 247  * Structure used in sigaltstack call.
 248  */
 249 typedef struct sigaltstack {
 250         char    *ss_sp;                 /* signal stack base */
 251         __size_t ss_size;               /* signal stack length */
 252         int     ss_flags;               /* SS_DISABLE and/or SS_ONSTACK */
 253 } stack_t;
 254
 255 #define SS_ONSTACK      0x0001  /* take signal on alternate stack */
 256 #define SS_DISABLE      0x0004  /* disable taking signals on alternate stack */
 257 #define MINSIGSTKSZ     8192                    /* minimum allowable stack */
 258 #define SIGSTKSZ        (MINSIGSTKSZ + 32768)   /* recommended stack size */
 259
 260 /* Have enough typedefs for this now.  XXX */
 261 #include <sys/ucontext.h>
 262
 263 /*
 264  * 4.3 compatibility:
 265  * Signal vector "template" used in sigvec call.
 266  */
 267 struct  sigvec {
 268         __sighandler_t *sv_handler;     /* signal handler */
 269         int     sv_mask;                /* signal mask to apply */
 270         int     sv_flags;               /* see signal options below */
 271 };
 272
 273 #define SV_ONSTACK      SA_ONSTACK
 274 #define SV_INTERRUPT    SA_RESTART      /* same bit, opposite sense */
 275 #define SV_RESETHAND    SA_RESETHAND
 276 #define SV_NODEFER      SA_NODEFER
 277 #define SV_NOCLDSTOP    SA_NOCLDSTOP
 278 #define SV_SIGINFO      SA_SIGINFO
 279 #define sv_onstack sv_flags     /* isn't compatibility wonderful! */
 280
 281 /*
 282  * Structure used in sigstack call.
 283  */
 284 struct  sigstack {
 285         char    *ss_sp;                 /* signal stack pointer */
 286         int     ss_onstack;             /* current status */
 287 };
 288
 289 /*
 290  * Macro for converting signal number to a mask suitable for
 291  * sigblock().
 292  */
 293 #define sigmask(m)      (1 << ((m)-1))
 294
 295 #define BADSIG          SIG_ERR
 296
 297 #endif /* !_POSIX_SOURCE */
 298
 299 /*
 300  * Flags for sigprocmask:
 301  */
 302 #define SIG_BLOCK       1       /* block specified signal set */
 303 #define SIG_UNBLOCK     2       /* unblock specified signal set */
 304 #define SIG_SETMASK     3       /* set specified signal set */
 305
 306 #endif /* !_ANSI_SOURCE */
 307
 308 /*
 309  * For historical reasons; programs expect signal's return value to be
 310  * defined by <sys/signal.h>.
 311  */
 312 __BEGIN_DECLS
 313 __sighandler_t *signal (int, __sighandler_t *);
 314 __END_DECLS
 315
 316 #endif  /* !_SYS_SIGNAL_H_ */