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/10.0/sys/sys/signal.h 233519 2012-03-26 19:12:09Z rmh $
   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 __POSIX_VISIBLE >= 200112 || __XSI_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 #define SIGLIBRT        33      /* reserved by real-time library. */
  115 #endif
  116 
  117 #define SIGRTMIN        65
  118 #define SIGRTMAX        126
  119 
  120 #define SIG_DFL         ((__sighandler_t *)0)
  121 #define SIG_IGN         ((__sighandler_t *)1)
  122 #define SIG_ERR         ((__sighandler_t *)-1)
  123 /* #define      SIG_CATCH       ((__sighandler_t *)2) See signalvar.h */
  124 #define SIG_HOLD        ((__sighandler_t *)3)
  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                 unsigned short _kevent_flags;
  174                 long __spare__[8];
  175         } _sigev_un;
  176 };
  177 
  178 #if __BSD_VISIBLE
  179 #define sigev_notify_kqueue             sigev_signo
  180 #define sigev_notify_kevent_flags       _sigev_un._kevent_flags
  181 #define sigev_notify_thread_id          _sigev_un._threadid
  182 #endif
  183 #define sigev_notify_function           _sigev_un._sigev_thread._function
  184 #define sigev_notify_attributes         _sigev_un._sigev_thread._attribute
  185 
  186 #define SIGEV_NONE      0               /* No async notification. */
  187 #define SIGEV_SIGNAL    1               /* Generate a queued signal. */
  188 #define SIGEV_THREAD    2               /* Call back from another pthread. */
  189 #if __BSD_VISIBLE
  190 #define SIGEV_KEVENT    3               /* Generate a kevent. */
  191 #define SIGEV_THREAD_ID 4               /* Send signal to a kernel thread. */
  192 #endif
  193 #endif /* __POSIX_VISIBLE >= 199309 */
  194 
  195 #if __POSIX_VISIBLE >= 199309 || __XSI_VISIBLE
  196 typedef struct __siginfo {
  197         int     si_signo;               /* signal number */
  198         int     si_errno;               /* errno association */
  199         /*
  200          * Cause of signal, one of the SI_ macros or signal-specific
  201          * values, i.e. one of the FPE_... values for SIGFPE.  This
  202          * value is equivalent to the second argument to an old-style
  203          * FreeBSD signal handler.
  204          */
  205         int     si_code;                /* signal code */
  206         __pid_t si_pid;                 /* sending process */
  207         __uid_t si_uid;                 /* sender's ruid */
  208         int     si_status;              /* exit value */
  209         void    *si_addr;               /* faulting instruction */
  210         union sigval si_value;          /* signal value */
  211         union   {
  212                 struct {
  213                         int     _trapno;/* machine specific trap code */
  214                 } _fault;
  215                 struct {
  216                         int     _timerid;
  217                         int     _overrun;
  218                 } _timer;
  219                 struct {
  220                         int     _mqd;
  221                 } _mesgq;
  222                 struct {
  223                         long    _band;          /* band event for SIGPOLL */
  224                 } _poll;                        /* was this ever used ? */
  225                 struct {
  226                         long    __spare1__;
  227                         int     __spare2__[7];
  228                 } __spare__;
  229         } _reason;
  230 } siginfo_t;
  231 
  232 #define si_trapno       _reason._fault._trapno
  233 #define si_timerid      _reason._timer._timerid
  234 #define si_overrun      _reason._timer._overrun
  235 #define si_mqd          _reason._mesgq._mqd
  236 #define si_band         _reason._poll._band
  237 
  238 /** si_code **/
  239 /* codes for SIGILL */
  240 #define ILL_ILLOPC      1       /* Illegal opcode.                      */
  241 #define ILL_ILLOPN      2       /* Illegal operand.                     */
  242 #define ILL_ILLADR      3       /* Illegal addressing mode.             */
  243 #define ILL_ILLTRP      4       /* Illegal trap.                        */
  244 #define ILL_PRVOPC      5       /* Privileged opcode.                   */
  245 #define ILL_PRVREG      6       /* Privileged register.                 */
  246 #define ILL_COPROC      7       /* Coprocessor error.                   */
  247 #define ILL_BADSTK      8       /* Internal stack error.                */
  248 
  249 /* codes for SIGBUS */
  250 #define BUS_ADRALN      1       /* Invalid address alignment.           */
  251 #define BUS_ADRERR      2       /* Nonexistent physical address.        */
  252 #define BUS_OBJERR      3       /* Object-specific hardware error.      */
  253 
  254 /* codes for SIGSEGV */
  255 #define SEGV_MAPERR     1       /* Address not mapped to object.        */
  256 #define SEGV_ACCERR     2       /* Invalid permissions for mapped       */
  257                                 /* object.                              */
  258 
  259 /* codes for SIGFPE */
  260 #define FPE_INTOVF      1       /* Integer overflow.                    */
  261 #define FPE_INTDIV      2       /* Integer divide by zero.              */
  262 #define FPE_FLTDIV      3       /* Floating point divide by zero.       */
  263 #define FPE_FLTOVF      4       /* Floating point overflow.             */
  264 #define FPE_FLTUND      5       /* Floating point underflow.            */
  265 #define FPE_FLTRES      6       /* Floating point inexact result.       */
  266 #define FPE_FLTINV      7       /* Invalid floating point operation.    */
  267 #define FPE_FLTSUB      8       /* Subscript out of range.              */
  268 
  269 /* codes for SIGTRAP */
  270 #define TRAP_BRKPT      1       /* Process breakpoint.                  */
  271 #define TRAP_TRACE      2       /* Process trace trap.                  */
  272 #define TRAP_DTRACE     3       /* DTrace induced trap.                 */
  273 
  274 /* codes for SIGCHLD */
  275 #define CLD_EXITED      1       /* Child has exited                     */
  276 #define CLD_KILLED      2       /* Child has terminated abnormally but  */
  277                                 /* did not create a core file           */
  278 #define CLD_DUMPED      3       /* Child has terminated abnormally and  */
  279                                 /* created a core file                  */
  280 #define CLD_TRAPPED     4       /* Traced child has trapped             */
  281 #define CLD_STOPPED     5       /* Child has stopped                    */
  282 #define CLD_CONTINUED   6       /* Stopped child has continued          */
  283 
  284 /* codes for SIGPOLL */
  285 #define POLL_IN         1       /* Data input available                 */
  286 #define POLL_OUT        2       /* Output buffers available             */
  287 #define POLL_MSG        3       /* Input message available              */
  288 #define POLL_ERR        4       /* I/O Error                            */
  289 #define POLL_PRI        5       /* High priority input available        */
  290 #define POLL_HUP        6       /* Device disconnected                  */
  291 
  292 #endif
  293 
  294 #if __POSIX_VISIBLE || __XSI_VISIBLE
  295 struct __siginfo;
  296 
  297 /*
  298  * Signal vector "template" used in sigaction call.
  299  */
  300 struct sigaction {
  301         union {
  302                 void    (*__sa_handler)(int);
  303                 void    (*__sa_sigaction)(int, struct __siginfo *, void *);
  304         } __sigaction_u;                /* signal handler */
  305         int     sa_flags;               /* see signal options below */
  306         sigset_t sa_mask;               /* signal mask to apply */
  307 };
  308 
  309 #define sa_handler      __sigaction_u.__sa_handler
  310 #endif
  311 
  312 #if __XSI_VISIBLE
  313 /* If SA_SIGINFO is set, sa_sigaction must be used instead of sa_handler. */
  314 #define sa_sigaction    __sigaction_u.__sa_sigaction
  315 #endif
  316 
  317 #if __POSIX_VISIBLE || __XSI_VISIBLE
  318 #define SA_NOCLDSTOP    0x0008  /* do not generate SIGCHLD on child stop */
  319 #endif /* __POSIX_VISIBLE || __XSI_VISIBLE */
  320 
  321 #if __XSI_VISIBLE
  322 #define SA_ONSTACK      0x0001  /* take signal on signal stack */
  323 #define SA_RESTART      0x0002  /* restart system call on signal return */
  324 #define SA_RESETHAND    0x0004  /* reset to SIG_DFL when taking signal */
  325 #define SA_NODEFER      0x0010  /* don't mask the signal we're delivering */
  326 #define SA_NOCLDWAIT    0x0020  /* don't keep zombies around */
  327 #define SA_SIGINFO      0x0040  /* signal handler with SA_SIGINFO args */
  328 #endif
  329 
  330 #if __BSD_VISIBLE
  331 #define NSIG            32      /* number of old signals (counting 0) */
  332 #endif
  333 
  334 #if __POSIX_VISIBLE || __XSI_VISIBLE
  335 #define SI_NOINFO       0               /* No signal info besides si_signo. */
  336 #define SI_USER         0x10001         /* Signal sent by kill(). */
  337 #define SI_QUEUE        0x10002         /* Signal sent by the sigqueue(). */
  338 #define SI_TIMER        0x10003         /* Signal generated by expiration of */
  339                                         /* a timer set by timer_settime(). */
  340 #define SI_ASYNCIO      0x10004         /* Signal generated by completion of */
  341                                         /* an asynchronous I/O request.*/
  342 #define SI_MESGQ        0x10005         /* Signal generated by arrival of a */
  343                                         /* message on an empty message queue. */
  344 #define SI_KERNEL       0x10006
  345 #define SI_LWP          0x10007         /* Signal sent by thr_kill */
  346 #endif
  347 #if __BSD_VISIBLE
  348 #define SI_UNDEFINED    0
  349 #endif
  350 
  351 #if __BSD_VISIBLE
  352 typedef __sighandler_t  *sig_t; /* type of pointer to a signal function */
  353 typedef void __siginfohandler_t(int, struct __siginfo *, void *);
  354 #endif
  355 
  356 #if __XSI_VISIBLE
  357 /*
  358  * Structure used in sigaltstack call.
  359  */
  360 #if __BSD_VISIBLE
  361 typedef struct sigaltstack {
  362 #else
  363 typedef struct {
  364 #endif
  365         char    *ss_sp;                 /* signal stack base */
  366         __size_t ss_size;               /* signal stack length */
  367         int     ss_flags;               /* SS_DISABLE and/or SS_ONSTACK */
  368 } stack_t;
  369 
  370 #define SS_ONSTACK      0x0001  /* take signal on alternate stack */
  371 #define SS_DISABLE      0x0004  /* disable taking signals on alternate stack */
  372 #define MINSIGSTKSZ     __MINSIGSTKSZ           /* minimum stack size */
  373 #define SIGSTKSZ        (MINSIGSTKSZ + 32768)   /* recommended stack size */
  374 #endif
  375 
  376 #if __BSD_VISIBLE
  377 /*
  378  * 4.3 compatibility:
  379  * Signal vector "template" used in sigvec call.
  380  */
  381 struct sigvec {
  382         __sighandler_t *sv_handler;     /* signal handler */
  383         int     sv_mask;                /* signal mask to apply */
  384         int     sv_flags;               /* see signal options below */
  385 };
  386 
  387 #define SV_ONSTACK      SA_ONSTACK
  388 #define SV_INTERRUPT    SA_RESTART      /* same bit, opposite sense */
  389 #define SV_RESETHAND    SA_RESETHAND
  390 #define SV_NODEFER      SA_NODEFER
  391 #define SV_NOCLDSTOP    SA_NOCLDSTOP
  392 #define SV_SIGINFO      SA_SIGINFO
  393 #define sv_onstack      sv_flags        /* isn't compatibility wonderful! */
  394 #endif
  395 
  396 /* Keep this in one place only */
  397 #if defined(_KERNEL) && defined(COMPAT_43) && \
  398     !defined(__i386__)
  399 struct osigcontext {
  400         int _not_used;
  401 };
  402 #endif
  403 
  404 #if __XSI_VISIBLE
  405 /*
  406  * Structure used in sigstack call.
  407  */
  408 struct sigstack {
  409         /* XXX ss_sp's type should be `void *'. */
  410         char    *ss_sp;                 /* signal stack pointer */
  411         int     ss_onstack;             /* current status */
  412 };
  413 #endif
  414 
  415 #if __BSD_VISIBLE || __POSIX_VISIBLE > 0 && __POSIX_VISIBLE <= 200112
  416 /*
  417  * Macro for converting signal number to a mask suitable for
  418  * sigblock().
  419  */
  420 #define sigmask(m)      (1 << ((m)-1))
  421 #endif
  422 
  423 #if __BSD_VISIBLE
  424 #define BADSIG          SIG_ERR
  425 #endif
  426 
  427 #if __POSIX_VISIBLE || __XSI_VISIBLE
  428 /*
  429  * Flags for sigprocmask:
  430  */
  431 #define SIG_BLOCK       1       /* block specified signal set */
  432 #define SIG_UNBLOCK     2       /* unblock specified signal set */
  433 #define SIG_SETMASK     3       /* set specified signal set */
  434 #endif
  435 
  436 /*
  437  * For historical reasons; programs expect signal's return value to be
  438  * defined by <sys/signal.h>.
  439  */
  440 __BEGIN_DECLS
  441 __sighandler_t *signal(int, __sighandler_t *);
  442 __END_DECLS
  443 
  444 #endif /* !_SYS_SIGNAL_H_ */

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