The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: 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  * 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: releng/5.0/sys/sys/signal.h 108514 2002-12-31 19:35:41Z mike $
   40  */
   41 
   42 #ifndef _SYS_SIGNAL_H_
   43 #define _SYS_SIGNAL_H_
   44 
   45 #include <sys/cdefs.h>
   46 #include <sys/_types.h>
   47 #include <sys/_sigset.h>
   48 
   49 #include <machine/signal.h>     /* sig_atomic_t; trap codes; sigcontext */
   50 
   51 /*
   52  * System defined signals.
   53  */
   54 #if __POSIX_VISIBLE || __XSI_VISIBLE
   55 #define SIGHUP          1       /* hangup */
   56 #endif
   57 #define SIGINT          2       /* interrupt */
   58 #if __POSIX_VISIBLE || __XSI_VISIBLE
   59 #define SIGQUIT         3       /* quit */
   60 #endif
   61 #define SIGILL          4       /* illegal instr. (not reset when caught) */
   62 #if __XSI_VISIBLE
   63 #define SIGTRAP         5       /* trace trap (not reset when caught) */
   64 #endif
   65 #define SIGABRT         6       /* abort() */
   66 #if __BSD_VISIBLE
   67 #define SIGIOT          SIGABRT /* compatibility */
   68 #define SIGEMT          7       /* EMT instruction */
   69 #endif
   70 #define SIGFPE          8       /* floating point exception */
   71 #if __POSIX_VISIBLE || __XSI_VISIBLE
   72 #define SIGKILL         9       /* kill (cannot be caught or ignored) */
   73 #endif
   74 #if __POSIX_VISIBLE >= 200112 || __XSI_VISIBLE
   75 #define SIGBUS          10      /* bus error */
   76 #endif
   77 #define SIGSEGV         11      /* segmentation violation */
   78 #if __BSD_VISIBLE
   79 #define SIGSYS          12      /* non-existent system call invoked */
   80 #endif
   81 #if __POSIX_VISIBLE || __XSI_VISIBLE
   82 #define SIGPIPE         13      /* write on a pipe with no one to read it */
   83 #define SIGALRM         14      /* alarm clock */
   84 #endif
   85 #define SIGTERM         15      /* software termination signal from kill */
   86 #if __POSIX_VISIBLE >= 200112 || __XSI_VISIBLE
   87 #define SIGURG          16      /* urgent condition on IO channel */
   88 #endif
   89 #if __POSIX_VISIBLE || __XSI_VISIBLE
   90 #define SIGSTOP         17      /* sendable stop signal not from tty */
   91 #define SIGTSTP         18      /* stop signal from tty */
   92 #define SIGCONT         19      /* continue a stopped process */
   93 #define SIGCHLD         20      /* to parent on child stop or exit */
   94 #define SIGTTIN         21      /* to readers pgrp upon background tty read */
   95 #define SIGTTOU         22      /* like TTIN if (tp->t_local&LTOSTOP) */
   96 #endif
   97 #if __BSD_VISIBLE
   98 #define SIGIO           23      /* input/output possible signal */
   99 #endif
  100 #if __XSI_VISIBLE
  101 #define SIGXCPU         24      /* exceeded CPU time limit */
  102 #define SIGXFSZ         25      /* exceeded file size limit */
  103 #define SIGVTALRM       26      /* virtual time alarm */
  104 #define SIGPROF         27      /* profiling time alarm */
  105 #endif
  106 #if __BSD_VISIBLE
  107 #define SIGWINCH        28      /* window size changes */
  108 #define SIGINFO         29      /* information request */
  109 #endif
  110 #if __POSIX_VISIBLE || __XSI_VISIBLE
  111 #define SIGUSR1         30      /* user defined signal 1 */
  112 #define SIGUSR2         31      /* user defined signal 2 */
  113 #endif
  114 /*
  115  * XXX missing SIGRTMIN, SIGRTMAX.
  116  */
  117 
  118 #define SIG_DFL         ((__sighandler_t *)0)
  119 #define SIG_IGN         ((__sighandler_t *)1)
  120 #define SIG_ERR         ((__sighandler_t *)-1)
  121 /*
  122  * XXX missing SIG_HOLD.
  123  */
  124 
  125 /*-
  126  * Type of a signal handling function.
  127  *
  128  * Language spec sez signal handlers take exactly one arg, even though we
  129  * actually supply three.  Ugh!
  130  *
  131  * We don't try to hide the difference by leaving out the args because
  132  * that would cause warnings about conformant programs.  Nonconformant
  133  * programs can avoid the warnings by casting to (__sighandler_t *) or
  134  * sig_t before calling signal() or assigning to sa_handler or sv_handler.
  135  *
  136  * The kernel should reverse the cast before calling the function.  It
  137  * has no way to do this, but on most machines 1-arg and 3-arg functions
  138  * have the same calling protocol so there is no problem in practice.
  139  * A bit in sa_flags could be used to specify the number of args.
  140  */
  141 typedef void __sighandler_t(int);
  142 
  143 #if __POSIX_VISIBLE || __XSI_VISIBLE
  144 #ifndef _SIGSET_T_DECLARED
  145 #define _SIGSET_T_DECLARED
  146 typedef __sigset_t      sigset_t;
  147 #endif
  148 #endif
  149 
  150 #if __POSIX_VISIBLE >= 199309 || __XSI_VISIBLE >= 500
  151 union sigval {
  152         /* Members as suggested by Annex C of POSIX 1003.1b. */
  153         int     sigval_int;
  154         void    *sigval_ptr;
  155 };
  156 #endif
  157 
  158 #if __POSIX_VISIBLE >= 199309
  159 struct sigevent {
  160         int     sigev_notify;           /* Notification type */
  161         union {
  162                 int     __sigev_signo;  /* Signal number */
  163                 int     __sigev_notify_kqueue;
  164         } __sigev_u;
  165         union sigval sigev_value;       /* Signal value */
  166 /*
  167  * XXX missing sigev_notify_function, sigev_notify_attributes.
  168  */
  169 };
  170 #define sigev_signo             __sigev_u.__sigev_signo
  171 #if __BSD_VISIBLE
  172 #define sigev_notify_kqueue     __sigev_u.__sigev_notify_kqueue
  173 #endif
  174 
  175 #define SIGEV_NONE      0               /* No async notification */
  176 #define SIGEV_SIGNAL    1               /* Generate a queued signal */
  177 #if __BSD_VISIBLE
  178 #define SIGEV_KEVENT    3               /* Generate a kevent */
  179 #endif
  180 /*
  181  * XXX missing SIGEV_THREAD.
  182  */
  183 #endif /* __POSIX_VISIBLE >= 199309 */
  184 
  185 #if __POSIX_VISIBLE >= 199309 || __XSI_VISIBLE
  186 typedef struct __siginfo {
  187         int     si_signo;               /* signal number */
  188         int     si_errno;               /* errno association */
  189         /*
  190          * Cause of signal, one of the SI_ macros or signal-specific
  191          * values, i.e. one of the FPE_... values for SIGFPE.  This
  192          * value is equivalent to the second argument to an old-style
  193          * FreeBSD signal handler.
  194          */
  195         int     si_code;                /* signal code */
  196         __pid_t si_pid;                 /* sending process */
  197         __uid_t si_uid;                 /* sender's ruid */
  198         int     si_status;              /* exit value */
  199         void    *si_addr;               /* faulting instruction */
  200         union sigval si_value;          /* signal value */
  201         long    si_band;                /* band event for SIGPOLL */
  202         int     __spare__[7];           /* gimme some slack */
  203 } siginfo_t;
  204 #endif
  205 
  206 #if __POSIX_VISIBLE || __XSI_VISIBLE
  207 struct __siginfo;
  208 
  209 /*
  210  * Signal vector "template" used in sigaction call.
  211  */
  212 struct sigaction {
  213         union {
  214                 void    (*__sa_handler)(int);
  215                 void    (*__sa_sigaction)(int, struct __siginfo *, void *);
  216         } __sigaction_u;                /* signal handler */
  217         int     sa_flags;               /* see signal options below */
  218         sigset_t sa_mask;               /* signal mask to apply */
  219 };
  220 
  221 #define sa_handler      __sigaction_u.__sa_handler
  222 #endif
  223 
  224 #if __XSI_VISIBLE
  225 /* If SA_SIGINFO is set, sa_sigaction must be used instead of sa_handler. */
  226 #define sa_sigaction    __sigaction_u.__sa_sigaction
  227 #endif
  228 
  229 #if __POSIX_VISIBLE || __XSI_VISIBLE
  230 #define SA_NOCLDSTOP    0x0008  /* do not generate SIGCHLD on child stop */
  231 #endif /* __POSIX_VISIBLE || __XSI_VISIBLE */
  232 
  233 #if __XSI_VISIBLE
  234 #define SA_ONSTACK      0x0001  /* take signal on signal stack */
  235 #define SA_RESTART      0x0002  /* restart system call on signal return */
  236 #define SA_RESETHAND    0x0004  /* reset to SIG_DFL when taking signal */
  237 #define SA_NODEFER      0x0010  /* don't mask the signal we're delivering */
  238 #define SA_NOCLDWAIT    0x0020  /* don't keep zombies around */
  239 #define SA_SIGINFO      0x0040  /* signal handler with SA_SIGINFO args */
  240 #endif
  241 #if __BSD_VISIBLE
  242 /* XXX dubious. */
  243 #ifdef COMPAT_SUNOS
  244 #define SA_USERTRAMP    0x0100  /* do not bounce off kernel's sigtramp */
  245 #endif
  246 #endif
  247 
  248 #if __BSD_VISIBLE
  249 #define NSIG            32      /* number of old signals (counting 0) */
  250 #endif
  251 
  252 #if __POSIX_VISIBLE || __XSI_VISIBLE
  253 #define SI_USER         0x10001
  254 #define SI_QUEUE        0x10002
  255 #define SI_TIMER        0x10003
  256 #define SI_ASYNCIO      0x10004
  257 #define SI_MESGQ        0x10005
  258 #endif
  259 #if __BSD_VISIBLE
  260 #define SI_UNDEFINED    0
  261 #endif
  262 
  263 #if __BSD_VISIBLE
  264 typedef __sighandler_t  *sig_t; /* type of pointer to a signal function */
  265 typedef void __siginfohandler_t(int, struct __siginfo *, void *);
  266 #endif
  267 
  268 #if __XSI_VISIBLE
  269 /*
  270  * Structure used in sigaltstack call.
  271  */
  272 #if __BSD_VISIBLE
  273 typedef struct sigaltstack {
  274 #else
  275 typedef struct {
  276 #endif
  277         char    *ss_sp;                 /* signal stack base */
  278         __size_t ss_size;               /* signal stack length */
  279         int     ss_flags;               /* SS_DISABLE and/or SS_ONSTACK */
  280 } stack_t;
  281 
  282 #define SS_ONSTACK      0x0001  /* take signal on alternate stack */
  283 #define SS_DISABLE      0x0004  /* disable taking signals on alternate stack */
  284 #define SIGSTKSZ        (MINSIGSTKSZ + 32768)   /* recommended stack size */
  285 #endif
  286 
  287 #if __BSD_VISIBLE
  288 /*
  289  * 4.3 compatibility:
  290  * Signal vector "template" used in sigvec call.
  291  */
  292 struct sigvec {
  293         __sighandler_t *sv_handler;     /* signal handler */
  294         int     sv_mask;                /* signal mask to apply */
  295         int     sv_flags;               /* see signal options below */
  296 };
  297 
  298 #define SV_ONSTACK      SA_ONSTACK
  299 #define SV_INTERRUPT    SA_RESTART      /* same bit, opposite sense */
  300 #define SV_RESETHAND    SA_RESETHAND
  301 #define SV_NODEFER      SA_NODEFER
  302 #define SV_NOCLDSTOP    SA_NOCLDSTOP
  303 #define SV_SIGINFO      SA_SIGINFO
  304 #define sv_onstack      sv_flags        /* isn't compatibility wonderful! */
  305 #endif
  306 
  307 /* Keep this in one place only */
  308 #if defined(_KERNEL) && defined(COMPAT_43) && \
  309     !defined(__i386__) && !defined(__alpha__)
  310 struct osigcontext {
  311         int _not_used;
  312 };
  313 #endif
  314 
  315 #if __XSI_VISIBLE
  316 /*
  317  * Structure used in sigstack call.
  318  */
  319 struct sigstack {
  320         /* XXX ss_sp's type should be `void *'. */
  321         char    *ss_sp;                 /* signal stack pointer */
  322         int     ss_onstack;             /* current status */
  323 };
  324 #endif
  325 
  326 #if __BSD_VISIBLE || __POSIX_VISIBLE > 0 && __POSIX_VISIBLE <= 200112
  327 /*
  328  * Macro for converting signal number to a mask suitable for
  329  * sigblock().
  330  */
  331 #define sigmask(m)      (1 << ((m)-1))
  332 #endif
  333 
  334 #if __BSD_VISIBLE
  335 #define BADSIG          SIG_ERR
  336 #endif
  337 
  338 #if __POSIX_VISIBLE || __XSI_VISIBLE
  339 /*
  340  * Flags for sigprocmask:
  341  */
  342 #define SIG_BLOCK       1       /* block specified signal set */
  343 #define SIG_UNBLOCK     2       /* unblock specified signal set */
  344 #define SIG_SETMASK     3       /* set specified signal set */
  345 #endif
  346 
  347 /*
  348  * For historical reasons; programs expect signal's return value to be
  349  * defined by <sys/signal.h>.
  350  */
  351 __BEGIN_DECLS
  352 __sighandler_t *signal(int, __sighandler_t *);
  353 __END_DECLS
  354 
  355 #endif /* !_SYS_SIGNAL_H_ */

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