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/11.2/sys/sys/signal.h 331722 2018-03-29 02:50:57Z eadler $
   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 #if __POSIX_VISIBLE >= 200809
   49 
   50 #include <sys/_pthreadtypes.h>
   51 #include <sys/_timespec.h>
   52 
   53 #ifndef _SIZE_T_DECLARED
   54 typedef __size_t        size_t;
   55 #define _SIZE_T_DECLARED
   56 #endif
   57 
   58 #ifndef _UID_T_DECLARED
   59 typedef __uid_t         uid_t;
   60 #define _UID_T_DECLARED
   61 #endif
   62 
   63 #endif /* __POSIX_VISIBLE >= 200809 */
   64 
   65 /*
   66  * System defined signals.
   67  */
   68 #if __POSIX_VISIBLE || __XSI_VISIBLE
   69 #define SIGHUP          1       /* hangup */
   70 #endif
   71 #define SIGINT          2       /* interrupt */
   72 #if __POSIX_VISIBLE || __XSI_VISIBLE
   73 #define SIGQUIT         3       /* quit */
   74 #endif
   75 #define SIGILL          4       /* illegal instr. (not reset when caught) */
   76 #if __XSI_VISIBLE
   77 #define SIGTRAP         5       /* trace trap (not reset when caught) */
   78 #endif
   79 #define SIGABRT         6       /* abort() */
   80 #if __BSD_VISIBLE
   81 #define SIGIOT          SIGABRT /* compatibility */
   82 #define SIGEMT          7       /* EMT instruction */
   83 #endif
   84 #define SIGFPE          8       /* floating point exception */
   85 #if __POSIX_VISIBLE || __XSI_VISIBLE
   86 #define SIGKILL         9       /* kill (cannot be caught or ignored) */
   87 #endif
   88 #if __POSIX_VISIBLE >= 200112 || __XSI_VISIBLE
   89 #define SIGBUS          10      /* bus error */
   90 #endif
   91 #define SIGSEGV         11      /* segmentation violation */
   92 #if __POSIX_VISIBLE >= 200112 || __XSI_VISIBLE
   93 #define SIGSYS          12      /* non-existent system call invoked */
   94 #endif
   95 #if __POSIX_VISIBLE || __XSI_VISIBLE
   96 #define SIGPIPE         13      /* write on a pipe with no one to read it */
   97 #define SIGALRM         14      /* alarm clock */
   98 #endif
   99 #define SIGTERM         15      /* software termination signal from kill */
  100 #if __POSIX_VISIBLE >= 200112 || __XSI_VISIBLE
  101 #define SIGURG          16      /* urgent condition on IO channel */
  102 #endif
  103 #if __POSIX_VISIBLE || __XSI_VISIBLE
  104 #define SIGSTOP         17      /* sendable stop signal not from tty */
  105 #define SIGTSTP         18      /* stop signal from tty */
  106 #define SIGCONT         19      /* continue a stopped process */
  107 #define SIGCHLD         20      /* to parent on child stop or exit */
  108 #define SIGTTIN         21      /* to readers pgrp upon background tty read */
  109 #define SIGTTOU         22      /* like TTIN if (tp->t_local&LTOSTOP) */
  110 #endif
  111 #if __BSD_VISIBLE
  112 #define SIGIO           23      /* input/output possible signal */
  113 #endif
  114 #if __XSI_VISIBLE
  115 #define SIGXCPU         24      /* exceeded CPU time limit */
  116 #define SIGXFSZ         25      /* exceeded file size limit */
  117 #define SIGVTALRM       26      /* virtual time alarm */
  118 #define SIGPROF         27      /* profiling time alarm */
  119 #endif
  120 #if __BSD_VISIBLE
  121 #define SIGWINCH        28      /* window size changes */
  122 #define SIGINFO         29      /* information request */
  123 #endif
  124 #if __POSIX_VISIBLE || __XSI_VISIBLE
  125 #define SIGUSR1         30      /* user defined signal 1 */
  126 #define SIGUSR2         31      /* user defined signal 2 */
  127 #endif
  128 #if __BSD_VISIBLE
  129 #define SIGTHR          32      /* reserved by thread library. */
  130 #define SIGLWP          SIGTHR
  131 #define SIGLIBRT        33      /* reserved by real-time library. */
  132 #endif
  133 
  134 #define SIGRTMIN        65
  135 #define SIGRTMAX        126
  136 
  137 #define SIG_DFL         ((__sighandler_t *)0)
  138 #define SIG_IGN         ((__sighandler_t *)1)
  139 #define SIG_ERR         ((__sighandler_t *)-1)
  140 /* #define      SIG_CATCH       ((__sighandler_t *)2) See signalvar.h */
  141 #define SIG_HOLD        ((__sighandler_t *)3)
  142 
  143 /*
  144  * Type of a signal handling function.
  145  *
  146  * Language spec sez signal handlers take exactly one arg, even though we
  147  * actually supply three.  Ugh!
  148  *
  149  * We don't try to hide the difference by leaving out the args because
  150  * that would cause warnings about conformant programs.  Nonconformant
  151  * programs can avoid the warnings by casting to (__sighandler_t *) or
  152  * sig_t before calling signal() or assigning to sa_handler or sv_handler.
  153  *
  154  * The kernel should reverse the cast before calling the function.  It
  155  * has no way to do this, but on most machines 1-arg and 3-arg functions
  156  * have the same calling protocol so there is no problem in practice.
  157  * A bit in sa_flags could be used to specify the number of args.
  158  */
  159 typedef void __sighandler_t(int);
  160 
  161 #if __POSIX_VISIBLE || __XSI_VISIBLE
  162 #ifndef _SIGSET_T_DECLARED
  163 #define _SIGSET_T_DECLARED
  164 typedef __sigset_t      sigset_t;
  165 #endif
  166 #endif
  167 
  168 #if __POSIX_VISIBLE >= 199309 || __XSI_VISIBLE >= 500
  169 union sigval {
  170         /* Members as suggested by Annex C of POSIX 1003.1b. */
  171         int     sival_int;
  172         void    *sival_ptr;
  173         /* 6.0 compatibility */
  174         int     sigval_int;
  175         void    *sigval_ptr;
  176 };
  177 
  178 #if defined(_WANT_LWPINFO32) || (defined(_KERNEL) && defined(__LP64__))
  179 union sigval32 {
  180         int     sival_int;
  181         uint32_t sival_ptr;
  182         /* 6.0 compatibility */
  183         int     sigval_int;
  184         uint32_t sigval_ptr;
  185 };
  186 #endif
  187 #endif
  188 
  189 #if __POSIX_VISIBLE >= 199309
  190 
  191 struct pthread_attr;
  192 
  193 struct sigevent {
  194         int     sigev_notify;           /* Notification type */
  195         int     sigev_signo;            /* Signal number */
  196         union sigval sigev_value;       /* Signal value */
  197         union {
  198                 __lwpid_t       _threadid;
  199                 struct {
  200                         void (*_function)(union sigval);
  201                         struct pthread_attr **_attribute;
  202                 } _sigev_thread;
  203                 unsigned short _kevent_flags;
  204                 long __spare__[8];
  205         } _sigev_un;
  206 };
  207 
  208 #if __BSD_VISIBLE
  209 #define sigev_notify_kqueue             sigev_signo
  210 #define sigev_notify_kevent_flags       _sigev_un._kevent_flags
  211 #define sigev_notify_thread_id          _sigev_un._threadid
  212 #endif
  213 #define sigev_notify_function           _sigev_un._sigev_thread._function
  214 #define sigev_notify_attributes         _sigev_un._sigev_thread._attribute
  215 
  216 #define SIGEV_NONE      0               /* No async notification. */
  217 #define SIGEV_SIGNAL    1               /* Generate a queued signal. */
  218 #define SIGEV_THREAD    2               /* Call back from another pthread. */
  219 #if __BSD_VISIBLE
  220 #define SIGEV_KEVENT    3               /* Generate a kevent. */
  221 #define SIGEV_THREAD_ID 4               /* Send signal to a kernel thread. */
  222 #endif
  223 
  224 #endif /* __POSIX_VISIBLE >= 199309 */
  225 
  226 #if __POSIX_VISIBLE >= 199309 || __XSI_VISIBLE
  227 typedef struct __siginfo {
  228         int     si_signo;               /* signal number */
  229         int     si_errno;               /* errno association */
  230         /*
  231          * Cause of signal, one of the SI_ macros or signal-specific
  232          * values, i.e. one of the FPE_... values for SIGFPE.  This
  233          * value is equivalent to the second argument to an old-style
  234          * FreeBSD signal handler.
  235          */
  236         int     si_code;                /* signal code */
  237         __pid_t si_pid;                 /* sending process */
  238         __uid_t si_uid;                 /* sender's ruid */
  239         int     si_status;              /* exit value */
  240         void    *si_addr;               /* faulting instruction */
  241         union sigval si_value;          /* signal value */
  242         union   {
  243                 struct {
  244                         int     _trapno;/* machine specific trap code */
  245                 } _fault;
  246                 struct {
  247                         int     _timerid;
  248                         int     _overrun;
  249                 } _timer;
  250                 struct {
  251                         int     _mqd;
  252                 } _mesgq;
  253                 struct {
  254                         long    _band;          /* band event for SIGPOLL */
  255                 } _poll;                        /* was this ever used ? */
  256                 struct {
  257                         long    __spare1__;
  258                         int     __spare2__[7];
  259                 } __spare__;
  260         } _reason;
  261 } siginfo_t;
  262 
  263 #define si_trapno       _reason._fault._trapno
  264 #define si_timerid      _reason._timer._timerid
  265 #define si_overrun      _reason._timer._overrun
  266 #define si_mqd          _reason._mesgq._mqd
  267 #define si_band         _reason._poll._band
  268 
  269 #if defined(_WANT_LWPINFO32) || (defined(_KERNEL) && defined(__LP64__))
  270 struct siginfo32 {
  271         int     si_signo;               /* signal number */
  272         int     si_errno;               /* errno association */
  273         int     si_code;                /* signal code */
  274         __pid_t si_pid;                 /* sending process */
  275         __uid_t si_uid;                 /* sender's ruid */
  276         int     si_status;              /* exit value */
  277         uint32_t si_addr;               /* faulting instruction */
  278         union sigval32 si_value;        /* signal value */
  279         union   {
  280                 struct {
  281                         int     _trapno;/* machine specific trap code */
  282                 } _fault;
  283                 struct {
  284                         int     _timerid;
  285                         int     _overrun;
  286                 } _timer;
  287                 struct {
  288                         int     _mqd;
  289                 } _mesgq;
  290                 struct {
  291                         int32_t _band;          /* band event for SIGPOLL */
  292                 } _poll;                        /* was this ever used ? */
  293                 struct {
  294                         int32_t __spare1__;
  295                         int     __spare2__[7];
  296                 } __spare__;
  297         } _reason;
  298 };
  299 #endif
  300 
  301 /** si_code **/
  302 /* codes for SIGILL */
  303 #define ILL_ILLOPC      1       /* Illegal opcode.                      */
  304 #define ILL_ILLOPN      2       /* Illegal operand.                     */
  305 #define ILL_ILLADR      3       /* Illegal addressing mode.             */
  306 #define ILL_ILLTRP      4       /* Illegal trap.                        */
  307 #define ILL_PRVOPC      5       /* Privileged opcode.                   */
  308 #define ILL_PRVREG      6       /* Privileged register.                 */
  309 #define ILL_COPROC      7       /* Coprocessor error.                   */
  310 #define ILL_BADSTK      8       /* Internal stack error.                */
  311 
  312 /* codes for SIGBUS */
  313 #define BUS_ADRALN      1       /* Invalid address alignment.           */
  314 #define BUS_ADRERR      2       /* Nonexistent physical address.        */
  315 #define BUS_OBJERR      3       /* Object-specific hardware error.      */
  316 
  317 /* codes for SIGSEGV */
  318 #define SEGV_MAPERR     1       /* Address not mapped to object.        */
  319 #define SEGV_ACCERR     2       /* Invalid permissions for mapped       */
  320                                 /* object.                              */
  321 
  322 /* codes for SIGFPE */
  323 #define FPE_INTOVF      1       /* Integer overflow.                    */
  324 #define FPE_INTDIV      2       /* Integer divide by zero.              */
  325 #define FPE_FLTDIV      3       /* Floating point divide by zero.       */
  326 #define FPE_FLTOVF      4       /* Floating point overflow.             */
  327 #define FPE_FLTUND      5       /* Floating point underflow.            */
  328 #define FPE_FLTRES      6       /* Floating point inexact result.       */
  329 #define FPE_FLTINV      7       /* Invalid floating point operation.    */
  330 #define FPE_FLTSUB      8       /* Subscript out of range.              */
  331 
  332 /* codes for SIGTRAP */
  333 #define TRAP_BRKPT      1       /* Process breakpoint.                  */
  334 #define TRAP_TRACE      2       /* Process trace trap.                  */
  335 #define TRAP_DTRACE     3       /* DTrace induced trap.                 */
  336 #define TRAP_CAP        4       /* Capabilities protective trap.        */
  337 
  338 /* codes for SIGCHLD */
  339 #define CLD_EXITED      1       /* Child has exited                     */
  340 #define CLD_KILLED      2       /* Child has terminated abnormally but  */
  341                                 /* did not create a core file           */
  342 #define CLD_DUMPED      3       /* Child has terminated abnormally and  */
  343                                 /* created a core file                  */
  344 #define CLD_TRAPPED     4       /* Traced child has trapped             */
  345 #define CLD_STOPPED     5       /* Child has stopped                    */
  346 #define CLD_CONTINUED   6       /* Stopped child has continued          */
  347 
  348 /* codes for SIGPOLL */
  349 #define POLL_IN         1       /* Data input available                 */
  350 #define POLL_OUT        2       /* Output buffers available             */
  351 #define POLL_MSG        3       /* Input message available              */
  352 #define POLL_ERR        4       /* I/O Error                            */
  353 #define POLL_PRI        5       /* High priority input available        */
  354 #define POLL_HUP        6       /* Device disconnected                  */
  355 
  356 #endif
  357 
  358 #if __POSIX_VISIBLE || __XSI_VISIBLE
  359 struct __siginfo;
  360 
  361 /*
  362  * Signal vector "template" used in sigaction call.
  363  */
  364 struct sigaction {
  365         union {
  366                 void    (*__sa_handler)(int);
  367                 void    (*__sa_sigaction)(int, struct __siginfo *, void *);
  368         } __sigaction_u;                /* signal handler */
  369         int     sa_flags;               /* see signal options below */
  370         sigset_t sa_mask;               /* signal mask to apply */
  371 };
  372 
  373 #define sa_handler      __sigaction_u.__sa_handler
  374 #endif
  375 
  376 #if __XSI_VISIBLE
  377 /* If SA_SIGINFO is set, sa_sigaction must be used instead of sa_handler. */
  378 #define sa_sigaction    __sigaction_u.__sa_sigaction
  379 #endif
  380 
  381 #if __POSIX_VISIBLE || __XSI_VISIBLE
  382 #define SA_NOCLDSTOP    0x0008  /* do not generate SIGCHLD on child stop */
  383 #endif /* __POSIX_VISIBLE || __XSI_VISIBLE */
  384 
  385 #if __XSI_VISIBLE
  386 #define SA_ONSTACK      0x0001  /* take signal on signal stack */
  387 #define SA_RESTART      0x0002  /* restart system call on signal return */
  388 #define SA_RESETHAND    0x0004  /* reset to SIG_DFL when taking signal */
  389 #define SA_NODEFER      0x0010  /* don't mask the signal we're delivering */
  390 #define SA_NOCLDWAIT    0x0020  /* don't keep zombies around */
  391 #define SA_SIGINFO      0x0040  /* signal handler with SA_SIGINFO args */
  392 #endif
  393 
  394 #if __BSD_VISIBLE
  395 #define NSIG            32      /* number of old signals (counting 0) */
  396 #endif
  397 
  398 #if __POSIX_VISIBLE || __XSI_VISIBLE
  399 #define SI_NOINFO       0               /* No signal info besides si_signo. */
  400 #define SI_USER         0x10001         /* Signal sent by kill(). */
  401 #define SI_QUEUE        0x10002         /* Signal sent by the sigqueue(). */
  402 #define SI_TIMER        0x10003         /* Signal generated by expiration of */
  403                                         /* a timer set by timer_settime(). */
  404 #define SI_ASYNCIO      0x10004         /* Signal generated by completion of */
  405                                         /* an asynchronous I/O request.*/
  406 #define SI_MESGQ        0x10005         /* Signal generated by arrival of a */
  407                                         /* message on an empty message queue. */
  408 #define SI_KERNEL       0x10006
  409 #define SI_LWP          0x10007         /* Signal sent by thr_kill */
  410 #endif
  411 #if __BSD_VISIBLE
  412 #define SI_UNDEFINED    0
  413 #endif
  414 
  415 #if __BSD_VISIBLE
  416 typedef __sighandler_t  *sig_t; /* type of pointer to a signal function */
  417 typedef void __siginfohandler_t(int, struct __siginfo *, void *);
  418 #endif
  419 
  420 #if __XSI_VISIBLE
  421 #if __BSD_VISIBLE
  422 #define __stack_t sigaltstack
  423 #endif
  424 typedef struct __stack_t stack_t;
  425 
  426 #define SS_ONSTACK      0x0001  /* take signal on alternate stack */
  427 #define SS_DISABLE      0x0004  /* disable taking signals on alternate stack */
  428 #define MINSIGSTKSZ     __MINSIGSTKSZ           /* minimum stack size */
  429 #define SIGSTKSZ        (MINSIGSTKSZ + 32768)   /* recommended stack size */
  430 #endif
  431 
  432 /*
  433  * Structure used in sigaltstack call.  Its definition is always
  434  * needed for __ucontext.  If __BSD_VISIBLE is defined, the structure
  435  * tag is actually sigaltstack.
  436  */
  437 struct __stack_t {
  438         void    *ss_sp;                 /* signal stack base */
  439         __size_t ss_size;               /* signal stack length */
  440         int     ss_flags;               /* SS_DISABLE and/or SS_ONSTACK */
  441 };
  442 
  443 #if __BSD_VISIBLE
  444 /*
  445  * 4.3 compatibility:
  446  * Signal vector "template" used in sigvec call.
  447  */
  448 struct sigvec {
  449         __sighandler_t *sv_handler;     /* signal handler */
  450         int     sv_mask;                /* signal mask to apply */
  451         int     sv_flags;               /* see signal options below */
  452 };
  453 
  454 #define SV_ONSTACK      SA_ONSTACK
  455 #define SV_INTERRUPT    SA_RESTART      /* same bit, opposite sense */
  456 #define SV_RESETHAND    SA_RESETHAND
  457 #define SV_NODEFER      SA_NODEFER
  458 #define SV_NOCLDSTOP    SA_NOCLDSTOP
  459 #define SV_SIGINFO      SA_SIGINFO
  460 #define sv_onstack      sv_flags        /* isn't compatibility wonderful! */
  461 #endif
  462 
  463 /* Keep this in one place only */
  464 #if defined(_KERNEL) && defined(COMPAT_43) && \
  465     !defined(__i386__)
  466 struct osigcontext {
  467         int _not_used;
  468 };
  469 #endif
  470 
  471 #if __XSI_VISIBLE
  472 /*
  473  * Structure used in sigstack call.
  474  */
  475 struct sigstack {
  476         void    *ss_sp;                 /* signal stack pointer */
  477         int     ss_onstack;             /* current status */
  478 };
  479 #endif
  480 
  481 #if __BSD_VISIBLE || __POSIX_VISIBLE > 0 && __POSIX_VISIBLE <= 200112
  482 /*
  483  * Macro for converting signal number to a mask suitable for
  484  * sigblock().
  485  */
  486 #define sigmask(m)      (1 << ((m)-1))
  487 #endif
  488 
  489 #if __BSD_VISIBLE
  490 #define BADSIG          SIG_ERR
  491 #endif
  492 
  493 #if __POSIX_VISIBLE || __XSI_VISIBLE
  494 /*
  495  * Flags for sigprocmask:
  496  */
  497 #define SIG_BLOCK       1       /* block specified signal set */
  498 #define SIG_UNBLOCK     2       /* unblock specified signal set */
  499 #define SIG_SETMASK     3       /* set specified signal set */
  500 #endif
  501 
  502 /*
  503  * For historical reasons; programs expect signal's return value to be
  504  * defined by <sys/signal.h>.
  505  */
  506 __BEGIN_DECLS
  507 __sighandler_t *signal(int, __sighandler_t *);
  508 __END_DECLS
  509 
  510 #endif /* !_SYS_SIGNAL_H_ */

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