The Design and Implementation of the FreeBSD Operating System, Second Edition
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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/9.1/sys/sys/signal.h 232290 2012-02-29 06:19:00Z 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 __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 #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 /* #define      SIG_CATCH       ((__sighandler_t *)2) See signalvar.h */
  123 #define SIG_HOLD        ((__sighandler_t *)3)
  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     sival_int;
  154         void    *sival_ptr;
  155         /* 6.0 compatibility */
  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         int     sigev_signo;            /* Signal number */
  165         union sigval sigev_value;       /* Signal value */
  166         union {
  167                 __lwpid_t       _threadid;
  168                 struct {
  169                         void (*_function)(union sigval);
  170                         void *_attribute; /* pthread_attr_t * */
  171                 } _sigev_thread;
  172                 unsigned short _kevent_flags;
  173                 long __spare__[8];
  174         } _sigev_un;
  175 };
  176 
  177 #if __BSD_VISIBLE
  178 #define sigev_notify_kqueue             sigev_signo
  179 #define sigev_notify_kevent_flags       _sigev_un._kevent_flags
  180 #define sigev_notify_thread_id          _sigev_un._threadid
  181 #endif
  182 #define sigev_notify_function           _sigev_un._sigev_thread._function
  183 #define sigev_notify_attributes         _sigev_un._sigev_thread._attribute
  184 
  185 #define SIGEV_NONE      0               /* No async notification. */
  186 #define SIGEV_SIGNAL    1               /* Generate a queued signal. */
  187 #define SIGEV_THREAD    2               /* Call back from another pthread. */
  188 #if __BSD_VISIBLE
  189 #define SIGEV_KEVENT    3               /* Generate a kevent. */
  190 #define SIGEV_THREAD_ID 4               /* Send signal to a kernel thread. */
  191 #endif
  192 #endif /* __POSIX_VISIBLE >= 199309 */
  193 
  194 #if __POSIX_VISIBLE >= 199309 || __XSI_VISIBLE
  195 typedef struct __siginfo {
  196         int     si_signo;               /* signal number */
  197         int     si_errno;               /* errno association */
  198         /*
  199          * Cause of signal, one of the SI_ macros or signal-specific
  200          * values, i.e. one of the FPE_... values for SIGFPE.  This
  201          * value is equivalent to the second argument to an old-style
  202          * FreeBSD signal handler.
  203          */
  204         int     si_code;                /* signal code */
  205         __pid_t si_pid;                 /* sending process */
  206         __uid_t si_uid;                 /* sender's ruid */
  207         int     si_status;              /* exit value */
  208         void    *si_addr;               /* faulting instruction */
  209         union sigval si_value;          /* signal value */
  210         union   {
  211                 struct {
  212                         int     _trapno;/* machine specific trap code */
  213                 } _fault;
  214                 struct {
  215                         int     _timerid;
  216                         int     _overrun;
  217                 } _timer;
  218                 struct {
  219                         int     _mqd;
  220                 } _mesgq;
  221                 struct {
  222                         long    _band;          /* band event for SIGPOLL */
  223                 } _poll;                        /* was this ever used ? */
  224                 struct {
  225                         long    __spare1__;
  226                         int     __spare2__[7];
  227                 } __spare__;
  228         } _reason;
  229 } siginfo_t;
  230 
  231 #define si_trapno       _reason._fault._trapno
  232 #define si_timerid      _reason._timer._timerid
  233 #define si_overrun      _reason._timer._overrun
  234 #define si_mqd          _reason._mesgq._mqd
  235 #define si_band         _reason._poll._band
  236 
  237 /** si_code **/
  238 /* codes for SIGILL */
  239 #define ILL_ILLOPC      1       /* Illegal opcode.                      */
  240 #define ILL_ILLOPN      2       /* Illegal operand.                     */
  241 #define ILL_ILLADR      3       /* Illegal addressing mode.             */
  242 #define ILL_ILLTRP      4       /* Illegal trap.                        */
  243 #define ILL_PRVOPC      5       /* Privileged opcode.                   */
  244 #define ILL_PRVREG      6       /* Privileged register.                 */
  245 #define ILL_COPROC      7       /* Coprocessor error.                   */
  246 #define ILL_BADSTK      8       /* Internal stack error.                */
  247 
  248 /* codes for SIGBUS */
  249 #define BUS_ADRALN      1       /* Invalid address alignment.           */
  250 #define BUS_ADRERR      2       /* Nonexistent physical address.        */
  251 #define BUS_OBJERR      3       /* Object-specific hardware error.      */
  252 
  253 /* codes for SIGSEGV */
  254 #define SEGV_MAPERR     1       /* Address not mapped to object.        */
  255 #define SEGV_ACCERR     2       /* Invalid permissions for mapped       */
  256                                 /* object.                              */
  257 
  258 /* codes for SIGFPE */
  259 #define FPE_INTOVF      1       /* Integer overflow.                    */
  260 #define FPE_INTDIV      2       /* Integer divide by zero.              */
  261 #define FPE_FLTDIV      3       /* Floating point divide by zero.       */
  262 #define FPE_FLTOVF      4       /* Floating point overflow.             */
  263 #define FPE_FLTUND      5       /* Floating point underflow.            */
  264 #define FPE_FLTRES      6       /* Floating point inexact result.       */
  265 #define FPE_FLTINV      7       /* Invalid floating point operation.    */
  266 #define FPE_FLTSUB      8       /* Subscript out of range.              */
  267 
  268 /* codes for SIGTRAP */
  269 #define TRAP_BRKPT      1       /* Process breakpoint.                  */
  270 #define TRAP_TRACE      2       /* Process trace trap.                  */
  271 #define TRAP_DTRACE     3       /* DTrace induced trap.                 */
  272 
  273 /* codes for SIGCHLD */
  274 #define CLD_EXITED      1       /* Child has exited                     */
  275 #define CLD_KILLED      2       /* Child has terminated abnormally but  */
  276                                 /* did not create a core file           */
  277 #define CLD_DUMPED      3       /* Child has terminated abnormally and  */
  278                                 /* created a core file                  */
  279 #define CLD_TRAPPED     4       /* Traced child has trapped             */
  280 #define CLD_STOPPED     5       /* Child has stopped                    */
  281 #define CLD_CONTINUED   6       /* Stopped child has continued          */
  282 
  283 /* codes for SIGPOLL */
  284 #define POLL_IN         1       /* Data input available                 */
  285 #define POLL_OUT        2       /* Output buffers available             */
  286 #define POLL_MSG        3       /* Input message available              */
  287 #define POLL_ERR        4       /* I/O Error                            */
  288 #define POLL_PRI        5       /* High priority input available        */
  289 #define POLL_HUP        6       /* Device disconnected                  */
  290 
  291 #endif
  292 
  293 #if __POSIX_VISIBLE || __XSI_VISIBLE
  294 struct __siginfo;
  295 
  296 /*
  297  * Signal vector "template" used in sigaction call.
  298  */
  299 struct sigaction {
  300         union {
  301                 void    (*__sa_handler)(int);
  302                 void    (*__sa_sigaction)(int, struct __siginfo *, void *);
  303         } __sigaction_u;                /* signal handler */
  304         int     sa_flags;               /* see signal options below */
  305         sigset_t sa_mask;               /* signal mask to apply */
  306 };
  307 
  308 #define sa_handler      __sigaction_u.__sa_handler
  309 #endif
  310 
  311 #if __XSI_VISIBLE
  312 /* If SA_SIGINFO is set, sa_sigaction must be used instead of sa_handler. */
  313 #define sa_sigaction    __sigaction_u.__sa_sigaction
  314 #endif
  315 
  316 #if __POSIX_VISIBLE || __XSI_VISIBLE
  317 #define SA_NOCLDSTOP    0x0008  /* do not generate SIGCHLD on child stop */
  318 #endif /* __POSIX_VISIBLE || __XSI_VISIBLE */
  319 
  320 #if __XSI_VISIBLE
  321 #define SA_ONSTACK      0x0001  /* take signal on signal stack */
  322 #define SA_RESTART      0x0002  /* restart system call on signal return */
  323 #define SA_RESETHAND    0x0004  /* reset to SIG_DFL when taking signal */
  324 #define SA_NODEFER      0x0010  /* don't mask the signal we're delivering */
  325 #define SA_NOCLDWAIT    0x0020  /* don't keep zombies around */
  326 #define SA_SIGINFO      0x0040  /* signal handler with SA_SIGINFO args */
  327 #endif
  328 
  329 #if __BSD_VISIBLE
  330 #define NSIG            32      /* number of old signals (counting 0) */
  331 #endif
  332 
  333 #if __POSIX_VISIBLE || __XSI_VISIBLE
  334 #define SI_NOINFO       0               /* No signal info besides si_signo. */
  335 #define SI_USER         0x10001         /* Signal sent by kill(). */
  336 #define SI_QUEUE        0x10002         /* Signal sent by the sigqueue(). */
  337 #define SI_TIMER        0x10003         /* Signal generated by expiration of */
  338                                         /* a timer set by timer_settime(). */
  339 #define SI_ASYNCIO      0x10004         /* Signal generated by completion of */
  340                                         /* an asynchronous I/O request.*/
  341 #define SI_MESGQ        0x10005         /* Signal generated by arrival of a */
  342                                         /* message on an empty message queue. */
  343 #define SI_KERNEL       0x10006
  344 #define SI_LWP          0x10007         /* Signal sent by thr_kill */
  345 #endif
  346 #if __BSD_VISIBLE
  347 #define SI_UNDEFINED    0
  348 #endif
  349 
  350 #if __BSD_VISIBLE
  351 typedef __sighandler_t  *sig_t; /* type of pointer to a signal function */
  352 typedef void __siginfohandler_t(int, struct __siginfo *, void *);
  353 #endif
  354 
  355 #if __XSI_VISIBLE
  356 /*
  357  * Structure used in sigaltstack call.
  358  */
  359 #if __BSD_VISIBLE
  360 typedef struct sigaltstack {
  361 #else
  362 typedef struct {
  363 #endif
  364         char    *ss_sp;                 /* signal stack base */
  365         __size_t ss_size;               /* signal stack length */
  366         int     ss_flags;               /* SS_DISABLE and/or SS_ONSTACK */
  367 } stack_t;
  368 
  369 #define SS_ONSTACK      0x0001  /* take signal on alternate stack */
  370 #define SS_DISABLE      0x0004  /* disable taking signals on alternate stack */
  371 #define MINSIGSTKSZ     __MINSIGSTKSZ           /* minimum stack size */
  372 #define SIGSTKSZ        (MINSIGSTKSZ + 32768)   /* recommended stack size */
  373 #endif
  374 
  375 #if __BSD_VISIBLE
  376 /*
  377  * 4.3 compatibility:
  378  * Signal vector "template" used in sigvec call.
  379  */
  380 struct sigvec {
  381         __sighandler_t *sv_handler;     /* signal handler */
  382         int     sv_mask;                /* signal mask to apply */
  383         int     sv_flags;               /* see signal options below */
  384 };
  385 
  386 #define SV_ONSTACK      SA_ONSTACK
  387 #define SV_INTERRUPT    SA_RESTART      /* same bit, opposite sense */
  388 #define SV_RESETHAND    SA_RESETHAND
  389 #define SV_NODEFER      SA_NODEFER
  390 #define SV_NOCLDSTOP    SA_NOCLDSTOP
  391 #define SV_SIGINFO      SA_SIGINFO
  392 #define sv_onstack      sv_flags        /* isn't compatibility wonderful! */
  393 #endif
  394 
  395 /* Keep this in one place only */
  396 #if defined(_KERNEL) && defined(COMPAT_43) && \
  397     !defined(__i386__)
  398 struct osigcontext {
  399         int _not_used;
  400 };
  401 #endif
  402 
  403 #if __XSI_VISIBLE
  404 /*
  405  * Structure used in sigstack call.
  406  */
  407 struct sigstack {
  408         /* XXX ss_sp's type should be `void *'. */
  409         char    *ss_sp;                 /* signal stack pointer */
  410         int     ss_onstack;             /* current status */
  411 };
  412 #endif
  413 
  414 #if __BSD_VISIBLE || __POSIX_VISIBLE > 0 && __POSIX_VISIBLE <= 200112
  415 /*
  416  * Macro for converting signal number to a mask suitable for
  417  * sigblock().
  418  */
  419 #define sigmask(m)      (1 << ((m)-1))
  420 #endif
  421 
  422 #if __BSD_VISIBLE
  423 #define BADSIG          SIG_ERR
  424 #endif
  425 
  426 #if __POSIX_VISIBLE || __XSI_VISIBLE
  427 /*
  428  * Flags for sigprocmask:
  429  */
  430 #define SIG_BLOCK       1       /* block specified signal set */
  431 #define SIG_UNBLOCK     2       /* unblock specified signal set */
  432 #define SIG_SETMASK     3       /* set specified signal set */
  433 #endif
  434 
  435 /*
  436  * For historical reasons; programs expect signal's return value to be
  437  * defined by <sys/signal.h>.
  438  */
  439 __BEGIN_DECLS
  440 __sighandler_t *signal(int, __sighandler_t *);
  441 __END_DECLS
  442 
  443 #endif /* !_SYS_SIGNAL_H_ */

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