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 1.23.2.2 2001/04/19 01:38:35 alfred Exp $
   40  */
   41 
   42 #ifndef _SYS_SIGNAL_H_
   43 #define _SYS_SIGNAL_H_
   44 
   45 #include <machine/stdint.h>     /* for __ types */
   46 #include <sys/cdefs.h>
   47 #include <sys/_posix.h>
   48 
   49 /*
   50  * sigset_t macros.
   51  */
   52 #define _SIG_WORDS      4
   53 #define _SIG_MAXSIG     128
   54 #define _SIG_IDX(sig)   ((sig) - 1)
   55 #define _SIG_WORD(sig)  (_SIG_IDX(sig) >> 5)
   56 #define _SIG_BIT(sig)   (1 << (_SIG_IDX(sig) & 31))
   57 #define _SIG_VALID(sig) ((sig) < _SIG_MAXSIG && (sig) > 0)
   58 
   59 /*
   60  * System defined signals.
   61  */
   62 #define SIGHUP          1       /* hangup */
   63 #define SIGINT          2       /* interrupt */
   64 #define SIGQUIT         3       /* quit */
   65 #define SIGILL          4       /* illegal instr. (not reset when caught) */
   66 #ifndef _POSIX_SOURCE
   67 #define SIGTRAP         5       /* trace trap (not reset when caught) */
   68 #endif
   69 #define SIGABRT         6       /* abort() */
   70 #ifndef _POSIX_SOURCE
   71 #define SIGIOT          SIGABRT /* compatibility */
   72 #define SIGEMT          7       /* EMT instruction */
   73 #endif
   74 #define SIGFPE          8       /* floating point exception */
   75 #define SIGKILL         9       /* kill (cannot be caught or ignored) */
   76 #ifndef _POSIX_SOURCE
   77 #define SIGBUS          10      /* bus error */
   78 #endif
   79 #define SIGSEGV         11      /* segmentation violation */
   80 #ifndef _POSIX_SOURCE
   81 #define SIGSYS          12      /* non-existent system call invoked */
   82 #endif
   83 #define SIGPIPE         13      /* write on a pipe with no one to read it */
   84 #define SIGALRM         14      /* alarm clock */
   85 #define SIGTERM         15      /* software termination signal from kill */
   86 #ifndef _POSIX_SOURCE
   87 #define SIGURG          16      /* urgent condition on IO channel */
   88 #endif
   89 #define SIGSTOP         17      /* sendable stop signal not from tty */
   90 #define SIGTSTP         18      /* stop signal from tty */
   91 #define SIGCONT         19      /* continue a stopped process */
   92 #define SIGCHLD         20      /* to parent on child stop or exit */
   93 #define SIGTTIN         21      /* to readers pgrp upon background tty read */
   94 #define SIGTTOU         22      /* like TTIN if (tp->t_local&LTOSTOP) */
   95 #ifndef _POSIX_SOURCE
   96 #define SIGIO           23      /* input/output possible signal */
   97 #define SIGXCPU         24      /* exceeded CPU time limit */
   98 #define SIGXFSZ         25      /* exceeded file size limit */
   99 #define SIGVTALRM       26      /* virtual time alarm */
  100 #define SIGPROF         27      /* profiling time alarm */
  101 #define SIGWINCH        28      /* window size changes */
  102 #define SIGINFO         29      /* information request */
  103 #endif
  104 #define SIGUSR1         30      /* user defined signal 1 */
  105 #define SIGUSR2         31      /* user defined signal 2 */
  106 #if __BSD_VISIBLE
  107 #define SIGTHR          32      /* Thread interrupt (FreeBSD-5 reserved) */
  108 #define SIGCKPT         33      /* checkpoint and continue */
  109 #define SIGCKPTEXIT     34      /* checkpoint and exit */
  110 #endif
  111 
  112 /*
  113  * si_code stuff
  114  */
  115 /* SIGILL */
  116 #define ILL_ILLOPC      1       /* Illegal opcode                       */
  117 #define ILL_ILLOPN      2       /* Illegal operand                      */
  118 #define ILL_ILLADR      3       /* Illegal addressing mode              */
  119 #define ILL_ILLTRP      4       /* Illegal trap                         */
  120 #define ILL_PRVOPC      5       /* Privileged opcode                    */
  121 #define ILL_PRVREG      6       /* Privileged register                  */
  122 #define ILL_COPROC      7       /* Coprocessor error                    */
  123 #define ILL_BADSTK      8       /* Internal stack error                 */
  124 
  125 /* SIGFPE */
  126 #define FPE_INTOVF      1       /* Integer overflow                     */
  127 #define FPE_INTDIV      2       /* Integer divide by zero               */
  128 #define FPE_FLTDIV      3       /* Floating point divide by zero        */
  129 #define FPE_FLTOVF      4       /* Floating point overflow              */
  130 #define FPE_FLTUND      5       /* Floating point underflow             */
  131 #define FPE_FLTRES      6       /* Floating point inexact result        */
  132 #define FPE_FLTINV      7       /* Invalid Floating point operation     */
  133 #define FPE_FLTSUB      8       /* Subscript out of range               */
  134 
  135 /* SIGSEGV */
  136 #define SEGV_MAPERR     1       /* Address not mapped to object         */
  137 #define SEGV_ACCERR     2       /* Invalid permissions for mapped object*/
  138 
  139 /* SIGBUS */
  140 #define BUS_ADRALN      1       /* Invalid address alignment            */
  141 #define BUS_ADRERR      2       /* Non-existent physical address        */
  142 #define BUS_OBJERR      3       /* Object specific hardware error       */
  143 
  144 /* SIGTRAP */
  145 #define TRAP_BRKPT      1       /* Process breakpoint                   */
  146 #define TRAP_TRACE      2       /* Process trace trap                   */
  147 
  148 /* SIGCHLD */
  149 #define CLD_EXITED      1       /* Child has exited                     */
  150 #define CLD_KILLED      2       /* Child has terminated abnormally but  */
  151                                 /* did not create a core file           */
  152 #define CLD_DUMPED      3       /* Child has terminated abnormally and  */
  153                                 /* created a core file                  */
  154 #define CLD_TRAPPED     4       /* Traced child has trapped             */
  155 #define CLD_STOPPED     5       /* Child has stopped                    */
  156 #define CLD_CONTINUED   6       /* Stopped child has continued          */
  157 
  158 /* SIGPOLL */
  159 #define POLL_IN         1       /* Data input available                 */
  160 #define POLL_OUT        2       /* Output buffers available             */
  161 #define POLL_MSG        3       /* Input message available              */
  162 #define POLL_ERR        4       /* I/O Error                            */
  163 #define POLL_PRI        5       /* High priority input available        */
  164 #define POLL_HUP        6       /* Device disconnected                  */
  165 
  166 
  167 /** si_code */
  168 #define SI_USER         0       /* Sent by kill(2)                      */
  169 #define SI_QUEUE        -1      /* Sent by the sigqueue(2)              */
  170 #define SI_TIMER        -2      /* Generated by expiration of a timer   */
  171                                 /* set by timer_settime(2)              */
  172 #define SI_ASYNCIO      -3      /* Generated by completion of an        */
  173                                 /* asynchronous I/O signal              */
  174 #define SI_MESGQ        -4      /* Generated by arrival of a message on */
  175                                 /* an empty message queue               */
  176 
  177 /*-
  178  * Type of a signal handling function.
  179  *
  180  * Language spec sez signal handlers take exactly one arg, even though we
  181  * actually supply three.  Ugh!
  182  *
  183  * We don't try to hide the difference by leaving out the args because
  184  * that would cause warnings about conformant programs.  Nonconformant
  185  * programs can avoid the warnings by casting to (__sighandler_t *) or
  186  * sig_t before calling signal() or assigning to sa_handler or sv_handler.
  187  *
  188  * The kernel should reverse the cast before calling the function.  It
  189  * has no way to do this, but on most machines 1-arg and 3-arg functions
  190  * have the same calling protocol so there is no problem in practice.
  191  * A bit in sa_flags could be used to specify the number of args.
  192  *
  193  * SIG_EINTR causes system calls to interrupt but generates no signal
  194  * delivery.  The caller is responsible for polling the event.
  195  */
  196 typedef void __sighandler_t (int);
  197 
  198 #define SIG_DFL         ((__sighandler_t *)0)
  199 #define SIG_IGN         ((__sighandler_t *)1)
  200 #define SIG_ERR         ((__sighandler_t *)-1)
  201 
  202 #if defined(_P1003_1B_VISIBLE) || defined(_KERNEL)
  203 union sigval {
  204         /* Members as suggested by SuSv2 and IEEE Std 1003.1 */
  205         int     sival_int;
  206         void    *sival_ptr;
  207         /* Leave old members for backward compatibility */
  208         int     sigval_int;
  209         void    *sigval_ptr;
  210 
  211 };
  212 
  213 struct sigevent {
  214         int     sigev_notify;           /* Notification type */
  215         union {
  216                 int     __sigev_signo;  /* Signal number */
  217                 int     __sigev_notify_kqueue;
  218                 void    *__sigev_notify_attributes;
  219         } __sigev_u;
  220         union sigval sigev_value;       /* Signal value */
  221         void (*sigev_notify_function)(union sigval);
  222 };
  223 #define sigev_signo             __sigev_u.__sigev_signo
  224 #define sigev_notify_attributes __sigev_u.__sigev_notify_attributes
  225 #define sigev_notify_kqueue     __sigev_u.__sigev_notify_kqueue
  226 
  227 #define SIGEV_NONE      0               /* No async notification */
  228 #define SIGEV_SIGNAL    1               /* Generate a queued signal */
  229 #define SIGEV_THREAD    2               /* Call back in a pthread */
  230 #define SIGEV_KEVENT    3               /* Generate a kevent */
  231 
  232 typedef struct __siginfo {
  233         int     si_signo;               /* signal number */
  234         int     si_errno;               /* errno association */
  235         /*
  236          * Cause of signal, one of the SI_ macros or signal-specific
  237          * values, i.e. one of the FPE_... values for SIGFPE. This
  238          * value is equivalent to the second argument to an old-style
  239          * FreeBSD signal handler.
  240          */
  241         int     si_code;                /* signal code */
  242         int     si_pid;                 /* sending process */
  243         unsigned int si_uid;            /* sender's ruid */
  244         int     si_status;              /* exit value */
  245         void    *si_addr;               /* faulting instruction */
  246         union sigval si_value;          /* signal value */
  247         long    si_band;                /* band event for SIGPOLL */
  248         int     __spare__[7];           /* gimme some slack */
  249 } siginfo_t;
  250 #endif /* _P1003_1B_VISIBLE */
  251 
  252 typedef struct __sigset {
  253         unsigned int    __bits[_SIG_WORDS];
  254 } sigset_t;
  255 
  256 /*
  257  * XXX - there are some nasty dependencies on include file order. Now that
  258  * sigset_t has been defined we can include the MD header.
  259  */     
  260 #include <machine/signal.h>     /* sig_atomic_t; trap codes; sigcontext */
  261 
  262 #if !defined(_ANSI_SOURCE)
  263 
  264 struct __siginfo;
  265 
  266 /*
  267  * Signal vector "template" used in sigaction call.
  268  */
  269 struct  sigaction {
  270         union {
  271                 void    (*__sa_handler) (int);
  272                 void    (*__sa_sigaction) (int, struct __siginfo *, void *);
  273         } __sigaction_u;                /* signal handler */
  274         int     sa_flags;               /* see signal options below */
  275         sigset_t sa_mask;               /* signal mask to apply */
  276 };
  277 
  278 /* if SA_SIGINFO is set, sa_sigaction is to be used instead of sa_handler. */
  279 #define sa_handler      __sigaction_u.__sa_handler
  280 
  281 #define SA_NOCLDSTOP    0x0008  /* do not generate SIGCHLD on child stop */
  282 
  283 #if !defined(_POSIX_SOURCE)
  284 
  285 #define sa_sigaction    __sigaction_u.__sa_sigaction
  286 
  287 #define SA_ONSTACK      0x0001  /* take signal on signal stack */
  288 #define SA_RESTART      0x0002  /* restart system call on signal return */
  289 #define SA_RESETHAND    0x0004  /* reset to SIG_DFL when taking signal */
  290 #define SA_NODEFER      0x0010  /* don't mask the signal we're delivering */
  291 #define SA_NOCLDWAIT    0x0020  /* don't keep zombies around */
  292 #define SA_SIGINFO      0x0040  /* signal handler with SA_SIGINFO args */
  293 
  294 #define NSIG            64      /* size of sigptbl */
  295 
  296 /* Additional FreeBSD values. */
  297 #define SI_UNDEFINED    0
  298 
  299 typedef void __siginfohandler_t (int, struct __siginfo *, void *);
  300 
  301 typedef __sighandler_t  *sig_t; /* type of pointer to a signal function */
  302 
  303 /*
  304  * Structure used in sigaltstack call.
  305  */
  306 typedef struct sigaltstack {
  307         char    *ss_sp;                 /* signal stack base */
  308         __size_t ss_size;               /* signal stack length */
  309         int     ss_flags;               /* SS_DISABLE and/or SS_ONSTACK */
  310 } stack_t;
  311 
  312 #define SS_ONSTACK      0x0001  /* take signal on alternate stack */
  313 #define SS_DISABLE      0x0004  /* disable taking signals on alternate stack */
  314 #define MINSIGSTKSZ     8192                    /* minimum allowable stack */
  315 #define SIGSTKSZ        (MINSIGSTKSZ + 32768)   /* recommended stack size */
  316 
  317 /* Have enough typedefs for this now.  XXX */
  318 #include <sys/ucontext.h>
  319 
  320 /*
  321  * 4.3 compatibility:
  322  * Signal vector "template" used in sigvec call.
  323  */
  324 struct  sigvec {
  325         __sighandler_t *sv_handler;     /* signal handler */
  326         int     sv_mask;                /* signal mask to apply */
  327         int     sv_flags;               /* see signal options below */
  328 };
  329 
  330 #define SV_ONSTACK      SA_ONSTACK
  331 #define SV_INTERRUPT    SA_RESTART      /* same bit, opposite sense */
  332 #define SV_RESETHAND    SA_RESETHAND
  333 #define SV_NODEFER      SA_NODEFER
  334 #define SV_NOCLDSTOP    SA_NOCLDSTOP
  335 #define SV_SIGINFO      SA_SIGINFO
  336 #define sv_onstack sv_flags     /* isn't compatibility wonderful! */
  337 
  338 /*
  339  * Structure used in sigstack call.
  340  */
  341 struct  sigstack {
  342         char    *ss_sp;                 /* signal stack pointer */
  343         int     ss_onstack;             /* current status */
  344 };
  345 
  346 /*
  347  * Macro for converting signal number to a mask suitable for
  348  * sigblock().
  349  */
  350 #define sigmask(m)      (1 << ((m)-1))
  351 
  352 #define BADSIG          SIG_ERR
  353 
  354 #endif /* !_POSIX_SOURCE */
  355 
  356 /*
  357  * Flags for sigprocmask:
  358  */
  359 #define SIG_BLOCK       1       /* block specified signal set */
  360 #define SIG_UNBLOCK     2       /* unblock specified signal set */
  361 #define SIG_SETMASK     3       /* set specified signal set */
  362 
  363 #endif /* !_ANSI_SOURCE */
  364 
  365 /*
  366  * For historical reasons; programs expect signal's return value to be
  367  * defined by <sys/signal.h>.
  368  */
  369 __BEGIN_DECLS
  370 __sighandler_t *signal (int, __sighandler_t *);
  371 __END_DECLS
  372 
  373 #endif  /* !_SYS_SIGNAL_H_ */

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