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  * SPDX-License-Identifier: BSD-3-Clause
    3  *
    4  * Copyright (c) 1982, 1986, 1989, 1991, 1993
    5  *      The Regents of the University of California.  All rights reserved.
    6  * (c) UNIX System Laboratories, Inc.
    7  * All or some portions of this file are derived from material licensed
    8  * to the University of California by American Telephone and Telegraph
    9  * Co. or Unix System Laboratories, Inc. and are reproduced herein with
   10  * the permission of UNIX System Laboratories, Inc.
   11  *
   12  * Redistribution and use in source and binary forms, with or without
   13  * modification, are permitted provided that the following conditions
   14  * are met:
   15  * 1. Redistributions of source code must retain the above copyright
   16  *    notice, this list of conditions and the following disclaimer.
   17  * 2. Redistributions in binary form must reproduce the above copyright
   18  *    notice, this list of conditions and the following disclaimer in the
   19  *    documentation and/or other materials provided with the distribution.
   20  * 3. Neither the name of the University nor the names of its contributors
   21  *    may be used to endorse or promote products derived from this software
   22  *    without specific prior written permission.
   23  *
   24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   34  * SUCH DAMAGE.
   35  *
   36  *      @(#)signal.h    8.4 (Berkeley) 5/4/95
   37  * $FreeBSD: releng/12.0/sys/sys/signal.h 326023 2017-11-20 19:43:44Z pfg $
   38  */
   39 
   40 #ifndef _SYS_SIGNAL_H_
   41 #define _SYS_SIGNAL_H_
   42 
   43 #include <sys/cdefs.h>
   44 #include <sys/_types.h>
   45 #include <sys/_sigset.h>
   46 
   47 #include <machine/_limits.h>    /* __MINSIGSTKSZ */
   48 #include <machine/signal.h>     /* sig_atomic_t; trap codes; sigcontext */
   49 
   50 #if __POSIX_VISIBLE >= 200809
   51 
   52 #include <sys/_pthreadtypes.h>
   53 #include <sys/_timespec.h>
   54 
   55 #ifndef _SIZE_T_DECLARED
   56 typedef __size_t        size_t;
   57 #define _SIZE_T_DECLARED
   58 #endif
   59 
   60 #ifndef _UID_T_DECLARED
   61 typedef __uid_t         uid_t;
   62 #define _UID_T_DECLARED
   63 #endif
   64 
   65 #endif /* __POSIX_VISIBLE >= 200809 */
   66 
   67 /*
   68  * System defined signals.
   69  */
   70 #if __POSIX_VISIBLE || __XSI_VISIBLE
   71 #define SIGHUP          1       /* hangup */
   72 #endif
   73 #define SIGINT          2       /* interrupt */
   74 #if __POSIX_VISIBLE || __XSI_VISIBLE
   75 #define SIGQUIT         3       /* quit */
   76 #endif
   77 #define SIGILL          4       /* illegal instr. (not reset when caught) */
   78 #if __XSI_VISIBLE
   79 #define SIGTRAP         5       /* trace trap (not reset when caught) */
   80 #endif
   81 #define SIGABRT         6       /* abort() */
   82 #if __BSD_VISIBLE
   83 #define SIGIOT          SIGABRT /* compatibility */
   84 #define SIGEMT          7       /* EMT instruction */
   85 #endif
   86 #define SIGFPE          8       /* floating point exception */
   87 #if __POSIX_VISIBLE || __XSI_VISIBLE
   88 #define SIGKILL         9       /* kill (cannot be caught or ignored) */
   89 #endif
   90 #if __POSIX_VISIBLE >= 200112 || __XSI_VISIBLE
   91 #define SIGBUS          10      /* bus error */
   92 #endif
   93 #define SIGSEGV         11      /* segmentation violation */
   94 #if __POSIX_VISIBLE >= 200112 || __XSI_VISIBLE
   95 #define SIGSYS          12      /* non-existent system call invoked */
   96 #endif
   97 #if __POSIX_VISIBLE || __XSI_VISIBLE
   98 #define SIGPIPE         13      /* write on a pipe with no one to read it */
   99 #define SIGALRM         14      /* alarm clock */
  100 #endif
  101 #define SIGTERM         15      /* software termination signal from kill */
  102 #if __POSIX_VISIBLE >= 200112 || __XSI_VISIBLE
  103 #define SIGURG          16      /* urgent condition on IO channel */
  104 #endif
  105 #if __POSIX_VISIBLE || __XSI_VISIBLE
  106 #define SIGSTOP         17      /* sendable stop signal not from tty */
  107 #define SIGTSTP         18      /* stop signal from tty */
  108 #define SIGCONT         19      /* continue a stopped process */
  109 #define SIGCHLD         20      /* to parent on child stop or exit */
  110 #define SIGTTIN         21      /* to readers pgrp upon background tty read */
  111 #define SIGTTOU         22      /* like TTIN if (tp->t_local&LTOSTOP) */
  112 #endif
  113 #if __BSD_VISIBLE
  114 #define SIGIO           23      /* input/output possible signal */
  115 #endif
  116 #if __XSI_VISIBLE
  117 #define SIGXCPU         24      /* exceeded CPU time limit */
  118 #define SIGXFSZ         25      /* exceeded file size limit */
  119 #define SIGVTALRM       26      /* virtual time alarm */
  120 #define SIGPROF         27      /* profiling time alarm */
  121 #endif
  122 #if __BSD_VISIBLE
  123 #define SIGWINCH        28      /* window size changes */
  124 #define SIGINFO         29      /* information request */
  125 #endif
  126 #if __POSIX_VISIBLE || __XSI_VISIBLE
  127 #define SIGUSR1         30      /* user defined signal 1 */
  128 #define SIGUSR2         31      /* user defined signal 2 */
  129 #endif
  130 #if __BSD_VISIBLE
  131 #define SIGTHR          32      /* reserved by thread library. */
  132 #define SIGLWP          SIGTHR
  133 #define SIGLIBRT        33      /* reserved by real-time library. */
  134 #endif
  135 
  136 #define SIGRTMIN        65
  137 #define SIGRTMAX        126
  138 
  139 #define SIG_DFL         ((__sighandler_t *)0)
  140 #define SIG_IGN         ((__sighandler_t *)1)
  141 #define SIG_ERR         ((__sighandler_t *)-1)
  142 /* #define      SIG_CATCH       ((__sighandler_t *)2) See signalvar.h */
  143 #define SIG_HOLD        ((__sighandler_t *)3)
  144 
  145 /*
  146  * Type of a signal handling function.
  147  *
  148  * Language spec sez signal handlers take exactly one arg, even though we
  149  * actually supply three.  Ugh!
  150  *
  151  * We don't try to hide the difference by leaving out the args because
  152  * that would cause warnings about conformant programs.  Nonconformant
  153  * programs can avoid the warnings by casting to (__sighandler_t *) or
  154  * sig_t before calling signal() or assigning to sa_handler or sv_handler.
  155  *
  156  * The kernel should reverse the cast before calling the function.  It
  157  * has no way to do this, but on most machines 1-arg and 3-arg functions
  158  * have the same calling protocol so there is no problem in practice.
  159  * A bit in sa_flags could be used to specify the number of args.
  160  */
  161 typedef void __sighandler_t(int);
  162 
  163 #if __POSIX_VISIBLE || __XSI_VISIBLE
  164 #ifndef _SIGSET_T_DECLARED
  165 #define _SIGSET_T_DECLARED
  166 typedef __sigset_t      sigset_t;
  167 #endif
  168 #endif
  169 
  170 #if __POSIX_VISIBLE >= 199309 || __XSI_VISIBLE >= 500
  171 union sigval {
  172         /* Members as suggested by Annex C of POSIX 1003.1b. */
  173         int     sival_int;
  174         void    *sival_ptr;
  175         /* 6.0 compatibility */
  176         int     sigval_int;
  177         void    *sigval_ptr;
  178 };
  179 
  180 #if defined(_WANT_LWPINFO32) || (defined(_KERNEL) && defined(__LP64__))
  181 union sigval32 {
  182         int     sival_int;
  183         uint32_t sival_ptr;
  184         /* 6.0 compatibility */
  185         int     sigval_int;
  186         uint32_t sigval_ptr;
  187 };
  188 #endif
  189 #endif
  190 
  191 #if __POSIX_VISIBLE >= 199309
  192 
  193 struct pthread_attr;
  194 
  195 struct sigevent {
  196         int     sigev_notify;           /* Notification type */
  197         int     sigev_signo;            /* Signal number */
  198         union sigval sigev_value;       /* Signal value */
  199         union {
  200                 __lwpid_t       _threadid;
  201                 struct {
  202                         void (*_function)(union sigval);
  203                         struct pthread_attr **_attribute;
  204                 } _sigev_thread;
  205                 unsigned short _kevent_flags;
  206                 long __spare__[8];
  207         } _sigev_un;
  208 };
  209 
  210 #if __BSD_VISIBLE
  211 #define sigev_notify_kqueue             sigev_signo
  212 #define sigev_notify_kevent_flags       _sigev_un._kevent_flags
  213 #define sigev_notify_thread_id          _sigev_un._threadid
  214 #endif
  215 #define sigev_notify_function           _sigev_un._sigev_thread._function
  216 #define sigev_notify_attributes         _sigev_un._sigev_thread._attribute
  217 
  218 #define SIGEV_NONE      0               /* No async notification. */
  219 #define SIGEV_SIGNAL    1               /* Generate a queued signal. */
  220 #define SIGEV_THREAD    2               /* Call back from another pthread. */
  221 #if __BSD_VISIBLE
  222 #define SIGEV_KEVENT    3               /* Generate a kevent. */
  223 #define SIGEV_THREAD_ID 4               /* Send signal to a kernel thread. */
  224 #endif
  225 
  226 #endif /* __POSIX_VISIBLE >= 199309 */
  227 
  228 #if __POSIX_VISIBLE >= 199309 || __XSI_VISIBLE
  229 typedef struct __siginfo {
  230         int     si_signo;               /* signal number */
  231         int     si_errno;               /* errno association */
  232         /*
  233          * Cause of signal, one of the SI_ macros or signal-specific
  234          * values, i.e. one of the FPE_... values for SIGFPE.  This
  235          * value is equivalent to the second argument to an old-style
  236          * FreeBSD signal handler.
  237          */
  238         int     si_code;                /* signal code */
  239         __pid_t si_pid;                 /* sending process */
  240         __uid_t si_uid;                 /* sender's ruid */
  241         int     si_status;              /* exit value */
  242         void    *si_addr;               /* faulting instruction */
  243         union sigval si_value;          /* signal value */
  244         union   {
  245                 struct {
  246                         int     _trapno;/* machine specific trap code */
  247                 } _fault;
  248                 struct {
  249                         int     _timerid;
  250                         int     _overrun;
  251                 } _timer;
  252                 struct {
  253                         int     _mqd;
  254                 } _mesgq;
  255                 struct {
  256                         long    _band;          /* band event for SIGPOLL */
  257                 } _poll;                        /* was this ever used ? */
  258                 struct {
  259                         long    __spare1__;
  260                         int     __spare2__[7];
  261                 } __spare__;
  262         } _reason;
  263 } siginfo_t;
  264 
  265 #define si_trapno       _reason._fault._trapno
  266 #define si_timerid      _reason._timer._timerid
  267 #define si_overrun      _reason._timer._overrun
  268 #define si_mqd          _reason._mesgq._mqd
  269 #define si_band         _reason._poll._band
  270 
  271 #if defined(_WANT_LWPINFO32) || (defined(_KERNEL) && defined(__LP64__))
  272 struct siginfo32 {
  273         int     si_signo;               /* signal number */
  274         int     si_errno;               /* errno association */
  275         int     si_code;                /* signal code */
  276         __pid_t si_pid;                 /* sending process */
  277         __uid_t si_uid;                 /* sender's ruid */
  278         int     si_status;              /* exit value */
  279         uint32_t si_addr;               /* faulting instruction */
  280         union sigval32 si_value;        /* signal value */
  281         union   {
  282                 struct {
  283                         int     _trapno;/* machine specific trap code */
  284                 } _fault;
  285                 struct {
  286                         int     _timerid;
  287                         int     _overrun;
  288                 } _timer;
  289                 struct {
  290                         int     _mqd;
  291                 } _mesgq;
  292                 struct {
  293                         int32_t _band;          /* band event for SIGPOLL */
  294                 } _poll;                        /* was this ever used ? */
  295                 struct {
  296                         int32_t __spare1__;
  297                         int     __spare2__[7];
  298                 } __spare__;
  299         } _reason;
  300 };
  301 #endif
  302 
  303 /** si_code **/
  304 /* codes for SIGILL */
  305 #define ILL_ILLOPC      1       /* Illegal opcode.                      */
  306 #define ILL_ILLOPN      2       /* Illegal operand.                     */
  307 #define ILL_ILLADR      3       /* Illegal addressing mode.             */
  308 #define ILL_ILLTRP      4       /* Illegal trap.                        */
  309 #define ILL_PRVOPC      5       /* Privileged opcode.                   */
  310 #define ILL_PRVREG      6       /* Privileged register.                 */
  311 #define ILL_COPROC      7       /* Coprocessor error.                   */
  312 #define ILL_BADSTK      8       /* Internal stack error.                */
  313 
  314 /* codes for SIGBUS */
  315 #define BUS_ADRALN      1       /* Invalid address alignment.           */
  316 #define BUS_ADRERR      2       /* Nonexistent physical address.        */
  317 #define BUS_OBJERR      3       /* Object-specific hardware error.      */
  318 
  319 /* codes for SIGSEGV */
  320 #define SEGV_MAPERR     1       /* Address not mapped to object.        */
  321 #define SEGV_ACCERR     2       /* Invalid permissions for mapped       */
  322                                 /* object.                              */
  323 
  324 /* codes for SIGFPE */
  325 #define FPE_INTOVF      1       /* Integer overflow.                    */
  326 #define FPE_INTDIV      2       /* Integer divide by zero.              */
  327 #define FPE_FLTDIV      3       /* Floating point divide by zero.       */
  328 #define FPE_FLTOVF      4       /* Floating point overflow.             */
  329 #define FPE_FLTUND      5       /* Floating point underflow.            */
  330 #define FPE_FLTRES      6       /* Floating point inexact result.       */
  331 #define FPE_FLTINV      7       /* Invalid floating point operation.    */
  332 #define FPE_FLTSUB      8       /* Subscript out of range.              */
  333 
  334 /* codes for SIGTRAP */
  335 #define TRAP_BRKPT      1       /* Process breakpoint.                  */
  336 #define TRAP_TRACE      2       /* Process trace trap.                  */
  337 #define TRAP_DTRACE     3       /* DTrace induced trap.                 */
  338 #define TRAP_CAP        4       /* Capabilities protective trap.        */
  339 
  340 /* codes for SIGCHLD */
  341 #define CLD_EXITED      1       /* Child has exited                     */
  342 #define CLD_KILLED      2       /* Child has terminated abnormally but  */
  343                                 /* did not create a core file           */
  344 #define CLD_DUMPED      3       /* Child has terminated abnormally and  */
  345                                 /* created a core file                  */
  346 #define CLD_TRAPPED     4       /* Traced child has trapped             */
  347 #define CLD_STOPPED     5       /* Child has stopped                    */
  348 #define CLD_CONTINUED   6       /* Stopped child has continued          */
  349 
  350 /* codes for SIGPOLL */
  351 #define POLL_IN         1       /* Data input available                 */
  352 #define POLL_OUT        2       /* Output buffers available             */
  353 #define POLL_MSG        3       /* Input message available              */
  354 #define POLL_ERR        4       /* I/O Error                            */
  355 #define POLL_PRI        5       /* High priority input available        */
  356 #define POLL_HUP        6       /* Device disconnected                  */
  357 
  358 #endif
  359 
  360 #if __POSIX_VISIBLE || __XSI_VISIBLE
  361 struct __siginfo;
  362 
  363 /*
  364  * Signal vector "template" used in sigaction call.
  365  */
  366 struct sigaction {
  367         union {
  368                 void    (*__sa_handler)(int);
  369                 void    (*__sa_sigaction)(int, struct __siginfo *, void *);
  370         } __sigaction_u;                /* signal handler */
  371         int     sa_flags;               /* see signal options below */
  372         sigset_t sa_mask;               /* signal mask to apply */
  373 };
  374 
  375 #define sa_handler      __sigaction_u.__sa_handler
  376 #endif
  377 
  378 #if __XSI_VISIBLE
  379 /* If SA_SIGINFO is set, sa_sigaction must be used instead of sa_handler. */
  380 #define sa_sigaction    __sigaction_u.__sa_sigaction
  381 #endif
  382 
  383 #if __POSIX_VISIBLE || __XSI_VISIBLE
  384 #define SA_NOCLDSTOP    0x0008  /* do not generate SIGCHLD on child stop */
  385 #endif /* __POSIX_VISIBLE || __XSI_VISIBLE */
  386 
  387 #if __XSI_VISIBLE
  388 #define SA_ONSTACK      0x0001  /* take signal on signal stack */
  389 #define SA_RESTART      0x0002  /* restart system call on signal return */
  390 #define SA_RESETHAND    0x0004  /* reset to SIG_DFL when taking signal */
  391 #define SA_NODEFER      0x0010  /* don't mask the signal we're delivering */
  392 #define SA_NOCLDWAIT    0x0020  /* don't keep zombies around */
  393 #define SA_SIGINFO      0x0040  /* signal handler with SA_SIGINFO args */
  394 #endif
  395 
  396 #if __BSD_VISIBLE
  397 #define NSIG            32      /* number of old signals (counting 0) */
  398 #endif
  399 
  400 #if __POSIX_VISIBLE || __XSI_VISIBLE
  401 #define SI_NOINFO       0               /* No signal info besides si_signo. */
  402 #define SI_USER         0x10001         /* Signal sent by kill(). */
  403 #define SI_QUEUE        0x10002         /* Signal sent by the sigqueue(). */
  404 #define SI_TIMER        0x10003         /* Signal generated by expiration of */
  405                                         /* a timer set by timer_settime(). */
  406 #define SI_ASYNCIO      0x10004         /* Signal generated by completion of */
  407                                         /* an asynchronous I/O request.*/
  408 #define SI_MESGQ        0x10005         /* Signal generated by arrival of a */
  409                                         /* message on an empty message queue. */
  410 #define SI_KERNEL       0x10006
  411 #define SI_LWP          0x10007         /* Signal sent by thr_kill */
  412 #endif
  413 #if __BSD_VISIBLE
  414 #define SI_UNDEFINED    0
  415 #endif
  416 
  417 #if __BSD_VISIBLE
  418 typedef __sighandler_t  *sig_t; /* type of pointer to a signal function */
  419 typedef void __siginfohandler_t(int, struct __siginfo *, void *);
  420 #endif
  421 
  422 #if __XSI_VISIBLE
  423 #if __BSD_VISIBLE
  424 #define __stack_t sigaltstack
  425 #endif
  426 typedef struct __stack_t stack_t;
  427 
  428 #define SS_ONSTACK      0x0001  /* take signal on alternate stack */
  429 #define SS_DISABLE      0x0004  /* disable taking signals on alternate stack */
  430 #define MINSIGSTKSZ     __MINSIGSTKSZ           /* minimum stack size */
  431 #define SIGSTKSZ        (MINSIGSTKSZ + 32768)   /* recommended stack size */
  432 #endif
  433 
  434 /*
  435  * Structure used in sigaltstack call.  Its definition is always
  436  * needed for __ucontext.  If __BSD_VISIBLE is defined, the structure
  437  * tag is actually sigaltstack.
  438  */
  439 struct __stack_t {
  440         void    *ss_sp;                 /* signal stack base */
  441         __size_t ss_size;               /* signal stack length */
  442         int     ss_flags;               /* SS_DISABLE and/or SS_ONSTACK */
  443 };
  444 
  445 #if __BSD_VISIBLE
  446 /*
  447  * 4.3 compatibility:
  448  * Signal vector "template" used in sigvec call.
  449  */
  450 struct sigvec {
  451         __sighandler_t *sv_handler;     /* signal handler */
  452         int     sv_mask;                /* signal mask to apply */
  453         int     sv_flags;               /* see signal options below */
  454 };
  455 
  456 #define SV_ONSTACK      SA_ONSTACK
  457 #define SV_INTERRUPT    SA_RESTART      /* same bit, opposite sense */
  458 #define SV_RESETHAND    SA_RESETHAND
  459 #define SV_NODEFER      SA_NODEFER
  460 #define SV_NOCLDSTOP    SA_NOCLDSTOP
  461 #define SV_SIGINFO      SA_SIGINFO
  462 #define sv_onstack      sv_flags        /* isn't compatibility wonderful! */
  463 #endif
  464 
  465 /* Keep this in one place only */
  466 #if defined(_KERNEL) && defined(COMPAT_43) && \
  467     !defined(__i386__)
  468 struct osigcontext {
  469         int _not_used;
  470 };
  471 #endif
  472 
  473 #if __XSI_VISIBLE
  474 /*
  475  * Structure used in sigstack call.
  476  */
  477 struct sigstack {
  478         void    *ss_sp;                 /* signal stack pointer */
  479         int     ss_onstack;             /* current status */
  480 };
  481 #endif
  482 
  483 #if __BSD_VISIBLE || __POSIX_VISIBLE > 0 && __POSIX_VISIBLE <= 200112
  484 /*
  485  * Macro for converting signal number to a mask suitable for
  486  * sigblock().
  487  */
  488 #define sigmask(m)      (1 << ((m)-1))
  489 #endif
  490 
  491 #if __BSD_VISIBLE
  492 #define BADSIG          SIG_ERR
  493 #endif
  494 
  495 #if __POSIX_VISIBLE || __XSI_VISIBLE
  496 /*
  497  * Flags for sigprocmask:
  498  */
  499 #define SIG_BLOCK       1       /* block specified signal set */
  500 #define SIG_UNBLOCK     2       /* unblock specified signal set */
  501 #define SIG_SETMASK     3       /* set specified signal set */
  502 #endif
  503 
  504 /*
  505  * For historical reasons; programs expect signal's return value to be
  506  * defined by <sys/signal.h>.
  507  */
  508 __BEGIN_DECLS
  509 __sighandler_t *signal(int, __sighandler_t *);
  510 __END_DECLS
  511 
  512 #endif /* !_SYS_SIGNAL_H_ */

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