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: releng/7.3/sys/sys/signal.h 174697 2007-12-17 03:05:56Z davidxu $
   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/_limits.h>    /* __MINSIGSTKSZ */
   46 #include <machine/signal.h>     /* sig_atomic_t; trap codes; sigcontext */
   47 
   48 /*
   49  * System defined signals.
   50  */
   51 #if __POSIX_VISIBLE || __XSI_VISIBLE
   52 #define SIGHUP          1       /* hangup */
   53 #endif
   54 #define SIGINT          2       /* interrupt */
   55 #if __POSIX_VISIBLE || __XSI_VISIBLE
   56 #define SIGQUIT         3       /* quit */
   57 #endif
   58 #define SIGILL          4       /* illegal instr. (not reset when caught) */
   59 #if __XSI_VISIBLE
   60 #define SIGTRAP         5       /* trace trap (not reset when caught) */
   61 #endif
   62 #define SIGABRT         6       /* abort() */
   63 #if __BSD_VISIBLE
   64 #define SIGIOT          SIGABRT /* compatibility */
   65 #define SIGEMT          7       /* EMT instruction */
   66 #endif
   67 #define SIGFPE          8       /* floating point exception */
   68 #if __POSIX_VISIBLE || __XSI_VISIBLE
   69 #define SIGKILL         9       /* kill (cannot be caught or ignored) */
   70 #endif
   71 #if __POSIX_VISIBLE >= 200112 || __XSI_VISIBLE
   72 #define SIGBUS          10      /* bus error */
   73 #endif
   74 #define SIGSEGV         11      /* segmentation violation */
   75 #if __BSD_VISIBLE
   76 #define SIGSYS          12      /* non-existent system call invoked */
   77 #endif
   78 #if __POSIX_VISIBLE || __XSI_VISIBLE
   79 #define SIGPIPE         13      /* write on a pipe with no one to read it */
   80 #define SIGALRM         14      /* alarm clock */
   81 #endif
   82 #define SIGTERM         15      /* software termination signal from kill */
   83 #if __POSIX_VISIBLE >= 200112 || __XSI_VISIBLE
   84 #define SIGURG          16      /* urgent condition on IO channel */
   85 #endif
   86 #if __POSIX_VISIBLE || __XSI_VISIBLE
   87 #define SIGSTOP         17      /* sendable stop signal not from tty */
   88 #define SIGTSTP         18      /* stop signal from tty */
   89 #define SIGCONT         19      /* continue a stopped process */
   90 #define SIGCHLD         20      /* to parent on child stop or exit */
   91 #define SIGTTIN         21      /* to readers pgrp upon background tty read */
   92 #define SIGTTOU         22      /* like TTIN if (tp->t_local&LTOSTOP) */
   93 #endif
   94 #if __BSD_VISIBLE
   95 #define SIGIO           23      /* input/output possible signal */
   96 #endif
   97 #if __XSI_VISIBLE
   98 #define SIGXCPU         24      /* exceeded CPU time limit */
   99 #define SIGXFSZ         25      /* exceeded file size limit */
  100 #define SIGVTALRM       26      /* virtual time alarm */
  101 #define SIGPROF         27      /* profiling time alarm */
  102 #endif
  103 #if __BSD_VISIBLE
  104 #define SIGWINCH        28      /* window size changes */
  105 #define SIGINFO         29      /* information request */
  106 #endif
  107 #if __POSIX_VISIBLE || __XSI_VISIBLE
  108 #define SIGUSR1         30      /* user defined signal 1 */
  109 #define SIGUSR2         31      /* user defined signal 2 */
  110 #endif
  111 #if __BSD_VISIBLE
  112 #define SIGTHR          32      /* reserved by thread library. */
  113 #define SIGLWP          SIGTHR
  114 #endif
  115 
  116 #define SIGRTMIN        65
  117 #define SIGRTMAX        126
  118 
  119 #define SIG_DFL         ((__sighandler_t *)0)
  120 #define SIG_IGN         ((__sighandler_t *)1)
  121 #define SIG_ERR         ((__sighandler_t *)-1)
  122 /*
  123  * XXX missing SIG_HOLD.
  124  */
  125 
  126 /*-
  127  * Type of a signal handling function.
  128  *
  129  * Language spec sez signal handlers take exactly one arg, even though we
  130  * actually supply three.  Ugh!
  131  *
  132  * We don't try to hide the difference by leaving out the args because
  133  * that would cause warnings about conformant programs.  Nonconformant
  134  * programs can avoid the warnings by casting to (__sighandler_t *) or
  135  * sig_t before calling signal() or assigning to sa_handler or sv_handler.
  136  *
  137  * The kernel should reverse the cast before calling the function.  It
  138  * has no way to do this, but on most machines 1-arg and 3-arg functions
  139  * have the same calling protocol so there is no problem in practice.
  140  * A bit in sa_flags could be used to specify the number of args.
  141  */
  142 typedef void __sighandler_t(int);
  143 
  144 #if __POSIX_VISIBLE || __XSI_VISIBLE
  145 #ifndef _SIGSET_T_DECLARED
  146 #define _SIGSET_T_DECLARED
  147 typedef __sigset_t      sigset_t;
  148 #endif
  149 #endif
  150 
  151 #if __POSIX_VISIBLE >= 199309 || __XSI_VISIBLE >= 500
  152 union sigval {
  153         /* Members as suggested by Annex C of POSIX 1003.1b. */
  154         int     sival_int;
  155         void    *sival_ptr;
  156         /* 6.0 compatibility */
  157         int     sigval_int;
  158         void    *sigval_ptr;
  159 };
  160 #endif
  161 
  162 #if __POSIX_VISIBLE >= 199309
  163 struct sigevent {
  164         int     sigev_notify;           /* Notification type */
  165         int     sigev_signo;            /* Signal number */
  166         union sigval sigev_value;       /* Signal value */
  167         union {
  168                 __lwpid_t       _threadid;
  169                 struct {
  170                         void (*_function)(union sigval);
  171                         void *_attribute; /* pthread_attr_t * */
  172                 } _sigev_thread;
  173                 long __spare__[8];
  174         } _sigev_un;
  175 };
  176 
  177 #if __BSD_VISIBLE
  178 #define sigev_notify_kqueue             sigev_signo
  179 #define sigev_notify_thread_id          _sigev_un._threadid
  180 #endif
  181 #define sigev_notify_function           _sigev_un._sigev_thread._function
  182 #define sigev_notify_attributes         _sigev_un._sigev_thread._attribute
  183 
  184 #define SIGEV_NONE      0               /* No async notification. */
  185 #define SIGEV_SIGNAL    1               /* Generate a queued signal. */
  186 #define SIGEV_THREAD    2               /* Call back from another pthread. */
  187 #if __BSD_VISIBLE
  188 #define SIGEV_KEVENT    3               /* Generate a kevent. */
  189 #define SIGEV_THREAD_ID 4               /* Send signal to a kernel thread. */
  190 #endif
  191 #endif /* __POSIX_VISIBLE >= 199309 */
  192 
  193 #if __POSIX_VISIBLE >= 199309 || __XSI_VISIBLE
  194 typedef struct __siginfo {
  195         int     si_signo;               /* signal number */
  196         int     si_errno;               /* errno association */
  197         /*
  198          * Cause of signal, one of the SI_ macros or signal-specific
  199          * values, i.e. one of the FPE_... values for SIGFPE.  This
  200          * value is equivalent to the second argument to an old-style
  201          * FreeBSD signal handler.
  202          */
  203         int     si_code;                /* signal code */
  204         __pid_t si_pid;                 /* sending process */
  205         __uid_t si_uid;                 /* sender's ruid */
  206         int     si_status;              /* exit value */
  207         void    *si_addr;               /* faulting instruction */
  208         union sigval si_value;          /* signal value */
  209         union   {
  210                 struct {
  211                         int     _trapno;/* machine specific trap code */
  212                 } _fault;
  213                 struct {
  214                         int     _timerid;
  215                         int     _overrun;
  216                 } _timer;
  217                 struct {
  218                         int     _mqd;
  219                 } _mesgq;
  220                 struct {
  221                         long    _band;          /* band event for SIGPOLL */
  222                 } _poll;                        /* was this ever used ? */
  223                 struct {
  224                         long    __spare1__;
  225                         int     __spare2__[7];
  226                 } __spare__;
  227         } _reason;
  228 } siginfo_t;
  229 
  230 #define si_trapno       _reason._fault._trapno
  231 #define si_timerid      _reason._timer._timerid
  232 #define si_overrun      _reason._timer._overrun
  233 #define si_mqd          _reason._mesgq._mqd
  234 #define si_band         _reason._poll._band
  235 
  236 /** si_code **/
  237 /* codes for SIGILL */
  238 #define ILL_ILLOPC      1       /* Illegal opcode.                      */
  239 #define ILL_ILLOPN      2       /* Illegal operand.                     */
  240 #define ILL_ILLADR      3       /* Illegal addressing mode.             */
  241 #define ILL_ILLTRP      4       /* Illegal trap.                        */
  242 #define ILL_PRVOPC      5       /* Privileged opcode.                   */
  243 #define ILL_PRVREG      6       /* Privileged register.                 */
  244 #define ILL_COPROC      7       /* Coprocessor error.                   */
  245 #define ILL_BADSTK      8       /* Internal stack error.                */
  246 
  247 /* codes for SIGBUS */
  248 #define BUS_ADRALN      1       /* Invalid address alignment.           */
  249 #define BUS_ADRERR      2       /* Nonexistent physical address.        */
  250 #define BUS_OBJERR      3       /* Object-specific hardware error.      */
  251 
  252 /* codes for SIGSEGV */
  253 #define SEGV_MAPERR     1       /* Address not mapped to object.        */
  254 #define SEGV_ACCERR     2       /* Invalid permissions for mapped       */
  255                                 /* object.                              */
  256 
  257 /* codes for SIGFPE */
  258 #define FPE_INTOVF      1       /* Integer overflow.                    */
  259 #define FPE_INTDIV      2       /* Integer divide by zero.              */
  260 #define FPE_FLTDIV      3       /* Floating point divide by zero.       */
  261 #define FPE_FLTOVF      4       /* Floating point overflow.             */
  262 #define FPE_FLTUND      5       /* Floating point underflow.            */
  263 #define FPE_FLTRES      6       /* Floating point inexact result.       */
  264 #define FPE_FLTINV      7       /* Invalid floating point operation.    */
  265 #define FPE_FLTSUB      8       /* Subscript out of range.              */
  266 
  267 /* codes for SIGTRAP */
  268 #define TRAP_BRKPT      1       /* Process breakpoint.                  */
  269 #define TRAP_TRACE      2       /* Process trace trap.                  */
  270 
  271 /* codes for SIGCHLD */
  272 #define CLD_EXITED      1       /* Child has exited                     */
  273 #define CLD_KILLED      2       /* Child has terminated abnormally but  */
  274                                 /* did not create a core file           */
  275 #define CLD_DUMPED      3       /* Child has terminated abnormally and  */
  276                                 /* created a core file                  */
  277 #define CLD_TRAPPED     4       /* Traced child has trapped             */
  278 #define CLD_STOPPED     5       /* Child has stopped                    */
  279 #define CLD_CONTINUED   6       /* Stopped child has continued          */
  280 
  281 /* codes for SIGPOLL */
  282 #define POLL_IN         1       /* Data input available                 */
  283 #define POLL_OUT        2       /* Output buffers available             */
  284 #define POLL_MSG        3       /* Input message available              */
  285 #define POLL_ERR        4       /* I/O Error                            */
  286 #define POLL_PRI        5       /* High priority input available        */
  287 #define POLL_HUP        4       /* Device disconnected                  */
  288 
  289 #endif
  290 
  291 #if __POSIX_VISIBLE || __XSI_VISIBLE
  292 struct __siginfo;
  293 
  294 /*
  295  * Signal vector "template" used in sigaction call.
  296  */
  297 struct sigaction {
  298         union {
  299                 void    (*__sa_handler)(int);
  300                 void    (*__sa_sigaction)(int, struct __siginfo *, void *);
  301         } __sigaction_u;                /* signal handler */
  302         int     sa_flags;               /* see signal options below */
  303         sigset_t sa_mask;               /* signal mask to apply */
  304 };
  305 
  306 #define sa_handler      __sigaction_u.__sa_handler
  307 #endif
  308 
  309 #if __XSI_VISIBLE
  310 /* If SA_SIGINFO is set, sa_sigaction must be used instead of sa_handler. */
  311 #define sa_sigaction    __sigaction_u.__sa_sigaction
  312 #endif
  313 
  314 #if __POSIX_VISIBLE || __XSI_VISIBLE
  315 #define SA_NOCLDSTOP    0x0008  /* do not generate SIGCHLD on child stop */
  316 #endif /* __POSIX_VISIBLE || __XSI_VISIBLE */
  317 
  318 #if __XSI_VISIBLE
  319 #define SA_ONSTACK      0x0001  /* take signal on signal stack */
  320 #define SA_RESTART      0x0002  /* restart system call on signal return */
  321 #define SA_RESETHAND    0x0004  /* reset to SIG_DFL when taking signal */
  322 #define SA_NODEFER      0x0010  /* don't mask the signal we're delivering */
  323 #define SA_NOCLDWAIT    0x0020  /* don't keep zombies around */
  324 #define SA_SIGINFO      0x0040  /* signal handler with SA_SIGINFO args */
  325 #endif
  326 
  327 #if __BSD_VISIBLE
  328 #define NSIG            32      /* number of old signals (counting 0) */
  329 #endif
  330 
  331 #if __POSIX_VISIBLE || __XSI_VISIBLE
  332 #define SI_NOINFO       0               /* No signal info besides si_signo. */
  333 #define SI_USER         0x10001         /* Signal sent by kill(). */
  334 #define SI_QUEUE        0x10002         /* Signal sent by the sigqueue(). */
  335 #define SI_TIMER        0x10003         /* Signal generated by expiration of */
  336                                         /* a timer set by timer_settime(). */
  337 #define SI_ASYNCIO      0x10004         /* Signal generated by completion of */
  338                                         /* an asynchronous I/O request.*/
  339 #define SI_MESGQ        0x10005         /* Signal generated by arrival of a */
  340                                         /* message on an empty message queue. */
  341 #endif
  342 #if __BSD_VISIBLE
  343 #define SI_UNDEFINED    0
  344 #endif
  345 
  346 #if __BSD_VISIBLE
  347 typedef __sighandler_t  *sig_t; /* type of pointer to a signal function */
  348 typedef void __siginfohandler_t(int, struct __siginfo *, void *);
  349 #endif
  350 
  351 #if __XSI_VISIBLE
  352 /*
  353  * Structure used in sigaltstack call.
  354  */
  355 #if __BSD_VISIBLE
  356 typedef struct sigaltstack {
  357 #else
  358 typedef struct {
  359 #endif
  360         char    *ss_sp;                 /* signal stack base */
  361         __size_t ss_size;               /* signal stack length */
  362         int     ss_flags;               /* SS_DISABLE and/or SS_ONSTACK */
  363 } stack_t;
  364 
  365 #define SS_ONSTACK      0x0001  /* take signal on alternate stack */
  366 #define SS_DISABLE      0x0004  /* disable taking signals on alternate stack */
  367 #define MINSIGSTKSZ     __MINSIGSTKSZ           /* minimum stack size */
  368 #define SIGSTKSZ        (MINSIGSTKSZ + 32768)   /* recommended stack size */
  369 #endif
  370 
  371 #if __BSD_VISIBLE
  372 /*
  373  * 4.3 compatibility:
  374  * Signal vector "template" used in sigvec call.
  375  */
  376 struct sigvec {
  377         __sighandler_t *sv_handler;     /* signal handler */
  378         int     sv_mask;                /* signal mask to apply */
  379         int     sv_flags;               /* see signal options below */
  380 };
  381 
  382 #define SV_ONSTACK      SA_ONSTACK
  383 #define SV_INTERRUPT    SA_RESTART      /* same bit, opposite sense */
  384 #define SV_RESETHAND    SA_RESETHAND
  385 #define SV_NODEFER      SA_NODEFER
  386 #define SV_NOCLDSTOP    SA_NOCLDSTOP
  387 #define SV_SIGINFO      SA_SIGINFO
  388 #define sv_onstack      sv_flags        /* isn't compatibility wonderful! */
  389 #endif
  390 
  391 /* Keep this in one place only */
  392 #if defined(_KERNEL) && defined(COMPAT_43) && \
  393     !defined(__i386__)
  394 struct osigcontext {
  395         int _not_used;
  396 };
  397 #endif
  398 
  399 #if __XSI_VISIBLE
  400 /*
  401  * Structure used in sigstack call.
  402  */
  403 struct sigstack {
  404         /* XXX ss_sp's type should be `void *'. */
  405         char    *ss_sp;                 /* signal stack pointer */
  406         int     ss_onstack;             /* current status */
  407 };
  408 #endif
  409 
  410 #if __BSD_VISIBLE || __POSIX_VISIBLE > 0 && __POSIX_VISIBLE <= 200112
  411 /*
  412  * Macro for converting signal number to a mask suitable for
  413  * sigblock().
  414  */
  415 #define sigmask(m)      (1 << ((m)-1))
  416 #endif
  417 
  418 #if __BSD_VISIBLE
  419 #define BADSIG          SIG_ERR
  420 #endif
  421 
  422 #if __POSIX_VISIBLE || __XSI_VISIBLE
  423 /*
  424  * Flags for sigprocmask:
  425  */
  426 #define SIG_BLOCK       1       /* block specified signal set */
  427 #define SIG_UNBLOCK     2       /* unblock specified signal set */
  428 #define SIG_SETMASK     3       /* set specified signal set */
  429 #endif
  430 
  431 /*
  432  * For historical reasons; programs expect signal's return value to be
  433  * defined by <sys/signal.h>.
  434  */
  435 __BEGIN_DECLS
  436 __sighandler_t *signal(int, __sighandler_t *);
  437 __END_DECLS
  438 
  439 #endif /* !_SYS_SIGNAL_H_ */

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