The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/sys/signal.h

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    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  * 4. Neither the name of the University nor the names of its contributors
   19  *    may be used to endorse or promote products derived from this software
   20  *    without specific prior written permission.
   21  *
   22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   32  * SUCH DAMAGE.
   33  *
   34  *      @(#)signal.h    8.4 (Berkeley) 5/4/95
   35  * $FreeBSD: src/sys/sys/signal.h,v 1.45 2004/06/11 11:43:46 phk Exp $
   36  */
   37 
   38 #ifndef _SYS_SIGNAL_H_
   39 #define _SYS_SIGNAL_H_
   40 
   41 #include <sys/cdefs.h>
   42 #include <sys/_types.h>
   43 #include <sys/_sigset.h>
   44 
   45 #include <machine/signal.h>     /* sig_atomic_t; trap codes; sigcontext */
   46 
   47 /*
   48  * System defined signals.
   49  */
   50 #if __POSIX_VISIBLE || __XSI_VISIBLE
   51 #define SIGHUP          1       /* hangup */
   52 #endif
   53 #define SIGINT          2       /* interrupt */
   54 #if __POSIX_VISIBLE || __XSI_VISIBLE
   55 #define SIGQUIT         3       /* quit */
   56 #endif
   57 #define SIGILL          4       /* illegal instr. (not reset when caught) */
   58 #if __XSI_VISIBLE
   59 #define SIGTRAP         5       /* trace trap (not reset when caught) */
   60 #endif
   61 #define SIGABRT         6       /* abort() */
   62 #if __BSD_VISIBLE
   63 #define SIGIOT          SIGABRT /* compatibility */
   64 #define SIGEMT          7       /* EMT instruction */
   65 #endif
   66 #define SIGFPE          8       /* floating point exception */
   67 #if __POSIX_VISIBLE || __XSI_VISIBLE
   68 #define SIGKILL         9       /* kill (cannot be caught or ignored) */
   69 #endif
   70 #if __POSIX_VISIBLE >= 200112 || __XSI_VISIBLE
   71 #define SIGBUS          10      /* bus error */
   72 #endif
   73 #define SIGSEGV         11      /* segmentation violation */
   74 #if __BSD_VISIBLE
   75 #define SIGSYS          12      /* non-existent system call invoked */
   76 #endif
   77 #if __POSIX_VISIBLE || __XSI_VISIBLE
   78 #define SIGPIPE         13      /* write on a pipe with no one to read it */
   79 #define SIGALRM         14      /* alarm clock */
   80 #endif
   81 #define SIGTERM         15      /* software termination signal from kill */
   82 #if __POSIX_VISIBLE >= 200112 || __XSI_VISIBLE
   83 #define SIGURG          16      /* urgent condition on IO channel */
   84 #endif
   85 #if __POSIX_VISIBLE || __XSI_VISIBLE
   86 #define SIGSTOP         17      /* sendable stop signal not from tty */
   87 #define SIGTSTP         18      /* stop signal from tty */
   88 #define SIGCONT         19      /* continue a stopped process */
   89 #define SIGCHLD         20      /* to parent on child stop or exit */
   90 #define SIGTTIN         21      /* to readers pgrp upon background tty read */
   91 #define SIGTTOU         22      /* like TTIN if (tp->t_local&LTOSTOP) */
   92 #endif
   93 #if __BSD_VISIBLE
   94 #define SIGIO           23      /* input/output possible signal */
   95 #endif
   96 #if __XSI_VISIBLE
   97 #define SIGXCPU         24      /* exceeded CPU time limit */
   98 #define SIGXFSZ         25      /* exceeded file size limit */
   99 #define SIGVTALRM       26      /* virtual time alarm */
  100 #define SIGPROF         27      /* profiling time alarm */
  101 #endif
  102 #if __BSD_VISIBLE
  103 #define SIGWINCH        28      /* window size changes */
  104 #define SIGINFO         29      /* information request */
  105 #endif
  106 #if __POSIX_VISIBLE || __XSI_VISIBLE
  107 #define SIGUSR1         30      /* user defined signal 1 */
  108 #define SIGUSR2         31      /* user defined signal 2 */
  109 #endif
  110 #if __BSD_VISIBLE
  111 #define SIGTHR          32      /* Thread interrupt. */
  112 #endif
  113 /*
  114  * XXX missing SIGRTMIN, SIGRTMAX.
  115  */
  116 
  117 #define SIG_DFL         ((__sighandler_t *)0)
  118 #define SIG_IGN         ((__sighandler_t *)1)
  119 #define SIG_ERR         ((__sighandler_t *)-1)
  120 /*
  121  * XXX missing SIG_HOLD.
  122  */
  123 
  124 /*-
  125  * Type of a signal handling function.
  126  *
  127  * Language spec sez signal handlers take exactly one arg, even though we
  128  * actually supply three.  Ugh!
  129  *
  130  * We don't try to hide the difference by leaving out the args because
  131  * that would cause warnings about conformant programs.  Nonconformant
  132  * programs can avoid the warnings by casting to (__sighandler_t *) or
  133  * sig_t before calling signal() or assigning to sa_handler or sv_handler.
  134  *
  135  * The kernel should reverse the cast before calling the function.  It
  136  * has no way to do this, but on most machines 1-arg and 3-arg functions
  137  * have the same calling protocol so there is no problem in practice.
  138  * A bit in sa_flags could be used to specify the number of args.
  139  */
  140 typedef void __sighandler_t(int);
  141 
  142 #if __POSIX_VISIBLE || __XSI_VISIBLE
  143 #ifndef _SIGSET_T_DECLARED
  144 #define _SIGSET_T_DECLARED
  145 typedef __sigset_t      sigset_t;
  146 #endif
  147 #endif
  148 
  149 #if __POSIX_VISIBLE >= 199309 || __XSI_VISIBLE >= 500
  150 union sigval {
  151         /* Members as suggested by Annex C of POSIX 1003.1b. */
  152         int     sigval_int;
  153         void    *sigval_ptr;
  154 };
  155 #endif
  156 
  157 #if __POSIX_VISIBLE >= 199309
  158 struct sigevent {
  159         int     sigev_notify;           /* Notification type */
  160         union {
  161                 int     __sigev_signo;  /* Signal number */
  162                 int     __sigev_notify_kqueue;
  163         } __sigev_u;
  164         union sigval sigev_value;       /* Signal value */
  165 /*
  166  * XXX missing sigev_notify_function, sigev_notify_attributes.
  167  */
  168 };
  169 #define sigev_signo             __sigev_u.__sigev_signo
  170 #if __BSD_VISIBLE
  171 #define sigev_notify_kqueue     __sigev_u.__sigev_notify_kqueue
  172 #endif
  173 
  174 #define SIGEV_NONE      0               /* No async notification */
  175 #define SIGEV_SIGNAL    1               /* Generate a queued signal */
  176 #if __BSD_VISIBLE
  177 #define SIGEV_KEVENT    3               /* Generate a kevent */
  178 #endif
  179 /*
  180  * XXX missing SIGEV_THREAD.
  181  */
  182 #endif /* __POSIX_VISIBLE >= 199309 */
  183 
  184 #if __POSIX_VISIBLE >= 199309 || __XSI_VISIBLE
  185 typedef struct __siginfo {
  186         int     si_signo;               /* signal number */
  187         int     si_errno;               /* errno association */
  188         /*
  189          * Cause of signal, one of the SI_ macros or signal-specific
  190          * values, i.e. one of the FPE_... values for SIGFPE.  This
  191          * value is equivalent to the second argument to an old-style
  192          * FreeBSD signal handler.
  193          */
  194         int     si_code;                /* signal code */
  195         __pid_t si_pid;                 /* sending process */
  196         __uid_t si_uid;                 /* sender's ruid */
  197         int     si_status;              /* exit value */
  198         void    *si_addr;               /* faulting instruction */
  199         union sigval si_value;          /* signal value */
  200         long    si_band;                /* band event for SIGPOLL */
  201         int     __spare__[7];           /* gimme some slack */
  202 } siginfo_t;
  203 #endif
  204 
  205 #if __POSIX_VISIBLE || __XSI_VISIBLE
  206 struct __siginfo;
  207 
  208 /*
  209  * Signal vector "template" used in sigaction call.
  210  */
  211 struct sigaction {
  212         union {
  213                 void    (*__sa_handler)(int);
  214                 void    (*__sa_sigaction)(int, struct __siginfo *, void *);
  215         } __sigaction_u;                /* signal handler */
  216         int     sa_flags;               /* see signal options below */
  217         sigset_t sa_mask;               /* signal mask to apply */
  218 };
  219 
  220 #define sa_handler      __sigaction_u.__sa_handler
  221 #endif
  222 
  223 #if __XSI_VISIBLE
  224 /* If SA_SIGINFO is set, sa_sigaction must be used instead of sa_handler. */
  225 #define sa_sigaction    __sigaction_u.__sa_sigaction
  226 #endif
  227 
  228 #if __POSIX_VISIBLE || __XSI_VISIBLE
  229 #define SA_NOCLDSTOP    0x0008  /* do not generate SIGCHLD on child stop */
  230 #endif /* __POSIX_VISIBLE || __XSI_VISIBLE */
  231 
  232 #if __XSI_VISIBLE
  233 #define SA_ONSTACK      0x0001  /* take signal on signal stack */
  234 #define SA_RESTART      0x0002  /* restart system call on signal return */
  235 #define SA_RESETHAND    0x0004  /* reset to SIG_DFL when taking signal */
  236 #define SA_NODEFER      0x0010  /* don't mask the signal we're delivering */
  237 #define SA_NOCLDWAIT    0x0020  /* don't keep zombies around */
  238 #define SA_SIGINFO      0x0040  /* signal handler with SA_SIGINFO args */
  239 #endif
  240 
  241 #if __BSD_VISIBLE
  242 #define NSIG            32      /* number of old signals (counting 0) */
  243 #endif
  244 
  245 #if __POSIX_VISIBLE || __XSI_VISIBLE
  246 #define SI_USER         0x10001
  247 #define SI_QUEUE        0x10002
  248 #define SI_TIMER        0x10003
  249 #define SI_ASYNCIO      0x10004
  250 #define SI_MESGQ        0x10005
  251 #endif
  252 #if __BSD_VISIBLE
  253 #define SI_UNDEFINED    0
  254 #endif
  255 
  256 #if __BSD_VISIBLE
  257 typedef __sighandler_t  *sig_t; /* type of pointer to a signal function */
  258 typedef void __siginfohandler_t(int, struct __siginfo *, void *);
  259 #endif
  260 
  261 #if __XSI_VISIBLE
  262 /*
  263  * Structure used in sigaltstack call.
  264  */
  265 #if __BSD_VISIBLE
  266 typedef struct sigaltstack {
  267 #else
  268 typedef struct {
  269 #endif
  270         char    *ss_sp;                 /* signal stack base */
  271         __size_t ss_size;               /* signal stack length */
  272         int     ss_flags;               /* SS_DISABLE and/or SS_ONSTACK */
  273 } stack_t;
  274 
  275 #define SS_ONSTACK      0x0001  /* take signal on alternate stack */
  276 #define SS_DISABLE      0x0004  /* disable taking signals on alternate stack */
  277 #define SIGSTKSZ        (MINSIGSTKSZ + 32768)   /* recommended stack size */
  278 #endif
  279 
  280 #if __BSD_VISIBLE
  281 /*
  282  * 4.3 compatibility:
  283  * Signal vector "template" used in sigvec call.
  284  */
  285 struct sigvec {
  286         __sighandler_t *sv_handler;     /* signal handler */
  287         int     sv_mask;                /* signal mask to apply */
  288         int     sv_flags;               /* see signal options below */
  289 };
  290 
  291 #define SV_ONSTACK      SA_ONSTACK
  292 #define SV_INTERRUPT    SA_RESTART      /* same bit, opposite sense */
  293 #define SV_RESETHAND    SA_RESETHAND
  294 #define SV_NODEFER      SA_NODEFER
  295 #define SV_NOCLDSTOP    SA_NOCLDSTOP
  296 #define SV_SIGINFO      SA_SIGINFO
  297 #define sv_onstack      sv_flags        /* isn't compatibility wonderful! */
  298 #endif
  299 
  300 /* Keep this in one place only */
  301 #if defined(_KERNEL) && defined(COMPAT_43) && \
  302     !defined(__i386__) && !defined(__alpha__)
  303 struct osigcontext {
  304         int _not_used;
  305 };
  306 #endif
  307 
  308 #if __XSI_VISIBLE
  309 /*
  310  * Structure used in sigstack call.
  311  */
  312 struct sigstack {
  313         /* XXX ss_sp's type should be `void *'. */
  314         char    *ss_sp;                 /* signal stack pointer */
  315         int     ss_onstack;             /* current status */
  316 };
  317 #endif
  318 
  319 #if __BSD_VISIBLE || __POSIX_VISIBLE > 0 && __POSIX_VISIBLE <= 200112
  320 /*
  321  * Macro for converting signal number to a mask suitable for
  322  * sigblock().
  323  */
  324 #define sigmask(m)      (1 << ((m)-1))
  325 #endif
  326 
  327 #if __BSD_VISIBLE
  328 #define BADSIG          SIG_ERR
  329 #endif
  330 
  331 #if __POSIX_VISIBLE || __XSI_VISIBLE
  332 /*
  333  * Flags for sigprocmask:
  334  */
  335 #define SIG_BLOCK       1       /* block specified signal set */
  336 #define SIG_UNBLOCK     2       /* unblock specified signal set */
  337 #define SIG_SETMASK     3       /* set specified signal set */
  338 #endif
  339 
  340 /*
  341  * For historical reasons; programs expect signal's return value to be
  342  * defined by <sys/signal.h>.
  343  */
  344 __BEGIN_DECLS
  345 __sighandler_t *signal(int, __sighandler_t *);
  346 __END_DECLS
  347 
  348 #endif /* !_SYS_SIGNAL_H_ */

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