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: src/sys/sys/signal.h,v 1.42 2003/03/31 23:31:50 jeff Exp $
   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 #if __BSD_VISIBLE
  115 #define SIGTHR          32      /* Thread interrupt. */
  116 #endif
  117 /*
  118  * XXX missing SIGRTMIN, SIGRTMAX.
  119  */
  120 
  121 #define SIG_DFL         ((__sighandler_t *)0)
  122 #define SIG_IGN         ((__sighandler_t *)1)
  123 #define SIG_ERR         ((__sighandler_t *)-1)
  124 /*
  125  * XXX missing SIG_HOLD.
  126  */
  127 
  128 /*-
  129  * Type of a signal handling function.
  130  *
  131  * Language spec sez signal handlers take exactly one arg, even though we
  132  * actually supply three.  Ugh!
  133  *
  134  * We don't try to hide the difference by leaving out the args because
  135  * that would cause warnings about conformant programs.  Nonconformant
  136  * programs can avoid the warnings by casting to (__sighandler_t *) or
  137  * sig_t before calling signal() or assigning to sa_handler or sv_handler.
  138  *
  139  * The kernel should reverse the cast before calling the function.  It
  140  * has no way to do this, but on most machines 1-arg and 3-arg functions
  141  * have the same calling protocol so there is no problem in practice.
  142  * A bit in sa_flags could be used to specify the number of args.
  143  */
  144 typedef void __sighandler_t(int);
  145 
  146 #if __POSIX_VISIBLE || __XSI_VISIBLE
  147 #ifndef _SIGSET_T_DECLARED
  148 #define _SIGSET_T_DECLARED
  149 typedef __sigset_t      sigset_t;
  150 #endif
  151 #endif
  152 
  153 #if __POSIX_VISIBLE >= 199309 || __XSI_VISIBLE >= 500
  154 union sigval {
  155         /* Members as suggested by Annex C of POSIX 1003.1b. */
  156         int     sigval_int;
  157         void    *sigval_ptr;
  158 };
  159 #endif
  160 
  161 #if __POSIX_VISIBLE >= 199309
  162 struct sigevent {
  163         int     sigev_notify;           /* Notification type */
  164         union {
  165                 int     __sigev_signo;  /* Signal number */
  166                 int     __sigev_notify_kqueue;
  167         } __sigev_u;
  168         union sigval sigev_value;       /* Signal value */
  169 /*
  170  * XXX missing sigev_notify_function, sigev_notify_attributes.
  171  */
  172 };
  173 #define sigev_signo             __sigev_u.__sigev_signo
  174 #if __BSD_VISIBLE
  175 #define sigev_notify_kqueue     __sigev_u.__sigev_notify_kqueue
  176 #endif
  177 
  178 #define SIGEV_NONE      0               /* No async notification */
  179 #define SIGEV_SIGNAL    1               /* Generate a queued signal */
  180 #if __BSD_VISIBLE
  181 #define SIGEV_KEVENT    3               /* Generate a kevent */
  182 #endif
  183 /*
  184  * XXX missing SIGEV_THREAD.
  185  */
  186 #endif /* __POSIX_VISIBLE >= 199309 */
  187 
  188 #if __POSIX_VISIBLE >= 199309 || __XSI_VISIBLE
  189 typedef struct __siginfo {
  190         int     si_signo;               /* signal number */
  191         int     si_errno;               /* errno association */
  192         /*
  193          * Cause of signal, one of the SI_ macros or signal-specific
  194          * values, i.e. one of the FPE_... values for SIGFPE.  This
  195          * value is equivalent to the second argument to an old-style
  196          * FreeBSD signal handler.
  197          */
  198         int     si_code;                /* signal code */
  199         __pid_t si_pid;                 /* sending process */
  200         __uid_t si_uid;                 /* sender's ruid */
  201         int     si_status;              /* exit value */
  202         void    *si_addr;               /* faulting instruction */
  203         union sigval si_value;          /* signal value */
  204         long    si_band;                /* band event for SIGPOLL */
  205         int     __spare__[7];           /* gimme some slack */
  206 } siginfo_t;
  207 #endif
  208 
  209 #if __POSIX_VISIBLE || __XSI_VISIBLE
  210 struct __siginfo;
  211 
  212 /*
  213  * Signal vector "template" used in sigaction call.
  214  */
  215 struct sigaction {
  216         union {
  217                 void    (*__sa_handler)(int);
  218                 void    (*__sa_sigaction)(int, struct __siginfo *, void *);
  219         } __sigaction_u;                /* signal handler */
  220         int     sa_flags;               /* see signal options below */
  221         sigset_t sa_mask;               /* signal mask to apply */
  222 };
  223 
  224 #define sa_handler      __sigaction_u.__sa_handler
  225 #endif
  226 
  227 #if __XSI_VISIBLE
  228 /* If SA_SIGINFO is set, sa_sigaction must be used instead of sa_handler. */
  229 #define sa_sigaction    __sigaction_u.__sa_sigaction
  230 #endif
  231 
  232 #if __POSIX_VISIBLE || __XSI_VISIBLE
  233 #define SA_NOCLDSTOP    0x0008  /* do not generate SIGCHLD on child stop */
  234 #endif /* __POSIX_VISIBLE || __XSI_VISIBLE */
  235 
  236 #if __XSI_VISIBLE
  237 #define SA_ONSTACK      0x0001  /* take signal on signal stack */
  238 #define SA_RESTART      0x0002  /* restart system call on signal return */
  239 #define SA_RESETHAND    0x0004  /* reset to SIG_DFL when taking signal */
  240 #define SA_NODEFER      0x0010  /* don't mask the signal we're delivering */
  241 #define SA_NOCLDWAIT    0x0020  /* don't keep zombies around */
  242 #define SA_SIGINFO      0x0040  /* signal handler with SA_SIGINFO args */
  243 #endif
  244 #if __BSD_VISIBLE
  245 /* XXX dubious. */
  246 #ifdef COMPAT_SUNOS
  247 #define SA_USERTRAMP    0x0100  /* do not bounce off kernel's sigtramp */
  248 #endif
  249 #endif
  250 
  251 #if __BSD_VISIBLE
  252 #define NSIG            32      /* number of old signals (counting 0) */
  253 #endif
  254 
  255 #if __POSIX_VISIBLE || __XSI_VISIBLE
  256 #define SI_USER         0x10001
  257 #define SI_QUEUE        0x10002
  258 #define SI_TIMER        0x10003
  259 #define SI_ASYNCIO      0x10004
  260 #define SI_MESGQ        0x10005
  261 #endif
  262 #if __BSD_VISIBLE
  263 #define SI_UNDEFINED    0
  264 #endif
  265 
  266 #if __BSD_VISIBLE
  267 typedef __sighandler_t  *sig_t; /* type of pointer to a signal function */
  268 typedef void __siginfohandler_t(int, struct __siginfo *, void *);
  269 #endif
  270 
  271 #if __XSI_VISIBLE
  272 /*
  273  * Structure used in sigaltstack call.
  274  */
  275 #if __BSD_VISIBLE
  276 typedef struct sigaltstack {
  277 #else
  278 typedef struct {
  279 #endif
  280         char    *ss_sp;                 /* signal stack base */
  281         __size_t ss_size;               /* signal stack length */
  282         int     ss_flags;               /* SS_DISABLE and/or SS_ONSTACK */
  283 } stack_t;
  284 
  285 #define SS_ONSTACK      0x0001  /* take signal on alternate stack */
  286 #define SS_DISABLE      0x0004  /* disable taking signals on alternate stack */
  287 #define SIGSTKSZ        (MINSIGSTKSZ + 32768)   /* recommended stack size */
  288 #endif
  289 
  290 #if __BSD_VISIBLE
  291 /*
  292  * 4.3 compatibility:
  293  * Signal vector "template" used in sigvec call.
  294  */
  295 struct sigvec {
  296         __sighandler_t *sv_handler;     /* signal handler */
  297         int     sv_mask;                /* signal mask to apply */
  298         int     sv_flags;               /* see signal options below */
  299 };
  300 
  301 #define SV_ONSTACK      SA_ONSTACK
  302 #define SV_INTERRUPT    SA_RESTART      /* same bit, opposite sense */
  303 #define SV_RESETHAND    SA_RESETHAND
  304 #define SV_NODEFER      SA_NODEFER
  305 #define SV_NOCLDSTOP    SA_NOCLDSTOP
  306 #define SV_SIGINFO      SA_SIGINFO
  307 #define sv_onstack      sv_flags        /* isn't compatibility wonderful! */
  308 #endif
  309 
  310 /* Keep this in one place only */
  311 #if defined(_KERNEL) && defined(COMPAT_43) && \
  312     !defined(__i386__) && !defined(__alpha__)
  313 struct osigcontext {
  314         int _not_used;
  315 };
  316 #endif
  317 
  318 #if __XSI_VISIBLE
  319 /*
  320  * Structure used in sigstack call.
  321  */
  322 struct sigstack {
  323         /* XXX ss_sp's type should be `void *'. */
  324         char    *ss_sp;                 /* signal stack pointer */
  325         int     ss_onstack;             /* current status */
  326 };
  327 #endif
  328 
  329 #if __BSD_VISIBLE || __POSIX_VISIBLE > 0 && __POSIX_VISIBLE <= 200112
  330 /*
  331  * Macro for converting signal number to a mask suitable for
  332  * sigblock().
  333  */
  334 #define sigmask(m)      (1 << ((m)-1))
  335 #endif
  336 
  337 #if __BSD_VISIBLE
  338 #define BADSIG          SIG_ERR
  339 #endif
  340 
  341 #if __POSIX_VISIBLE || __XSI_VISIBLE
  342 /*
  343  * Flags for sigprocmask:
  344  */
  345 #define SIG_BLOCK       1       /* block specified signal set */
  346 #define SIG_UNBLOCK     2       /* unblock specified signal set */
  347 #define SIG_SETMASK     3       /* set specified signal set */
  348 #endif
  349 
  350 /*
  351  * For historical reasons; programs expect signal's return value to be
  352  * defined by <sys/signal.h>.
  353  */
  354 __BEGIN_DECLS
  355 __sighandler_t *signal(int, __sighandler_t *);
  356 __END_DECLS
  357 
  358 #endif /* !_SYS_SIGNAL_H_ */

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