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 /*      $OpenBSD: signal.h,v 1.19 2006/01/08 14:20:16 millert Exp $     */
    2 /*      $NetBSD: signal.h,v 1.21 1996/02/09 18:25:32 christos Exp $     */
    3 
    4 /*
    5  * Copyright (c) 1982, 1986, 1989, 1991, 1993
    6  *      The Regents of the University of California.  All rights reserved.
    7  * (c) UNIX System Laboratories, Inc.
    8  * All or some portions of this file are derived from material licensed
    9  * to the University of California by American Telephone and Telegraph
   10  * Co. or Unix System Laboratories, Inc. and are reproduced herein with
   11  * the permission of UNIX System Laboratories, Inc.
   12  *
   13  * Redistribution and use in source and binary forms, with or without
   14  * modification, are permitted provided that the following conditions
   15  * are met:
   16  * 1. Redistributions of source code must retain the above copyright
   17  *    notice, this list of conditions and the following disclaimer.
   18  * 2. Redistributions in binary form must reproduce the above copyright
   19  *    notice, this list of conditions and the following disclaimer in the
   20  *    documentation and/or other materials provided with the distribution.
   21  * 3. Neither the name of the University nor the names of its contributors
   22  *    may be used to endorse or promote products derived from this software
   23  *    without specific prior written permission.
   24  *
   25  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   26  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   27  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   28  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   29  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   30  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   31  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   32  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   33  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   34  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   35  * SUCH DAMAGE.
   36  *
   37  *      @(#)signal.h    8.2 (Berkeley) 1/21/94
   38  */
   39 
   40 #ifndef _SYS_SIGNAL_H_
   41 #define _SYS_SIGNAL_H_
   42 
   43 #include <sys/cdefs.h>
   44 #include <machine/signal.h>     /* sigcontext; codes for SIGILL, SIGFPE */
   45 
   46 #define _NSIG   32              /* counting 0; could be 33 (mask is 1-32) */
   47 
   48 #if __BSD_VISIBLE
   49 #define NSIG _NSIG
   50 #endif
   51 
   52 #define SIGHUP  1       /* hangup */
   53 #define SIGINT  2       /* interrupt */
   54 #define SIGQUIT 3       /* quit */
   55 #define SIGILL  4       /* illegal instruction (not reset when caught) */
   56 #define SIGTRAP 5       /* trace trap (not reset when caught) */
   57 #define SIGABRT 6       /* abort() */
   58 #if __BSD_VISIBLE
   59 #define SIGIOT  SIGABRT /* compatibility */
   60 #define SIGEMT  7       /* EMT instruction */
   61 #endif
   62 #define SIGFPE  8       /* floating point exception */
   63 #define SIGKILL 9       /* kill (cannot be caught or ignored) */
   64 #define SIGBUS  10      /* bus error */
   65 #define SIGSEGV 11      /* segmentation violation */
   66 #define SIGSYS  12      /* bad argument to system call */
   67 #define SIGPIPE 13      /* write on a pipe with no one to read it */
   68 #define SIGALRM 14      /* alarm clock */
   69 #define SIGTERM 15      /* software termination signal from kill */
   70 #define SIGURG  16      /* urgent condition on IO channel */
   71 #define SIGSTOP 17      /* sendable stop signal not from tty */
   72 #define SIGTSTP 18      /* stop signal from tty */
   73 #define SIGCONT 19      /* continue a stopped process */
   74 #define SIGCHLD 20      /* to parent on child stop or exit */
   75 #define SIGTTIN 21      /* to readers pgrp upon background tty read */
   76 #define SIGTTOU 22      /* like TTIN for output if (tp->t_local&LTOSTOP) */
   77 #if __BSD_VISIBLE
   78 #define SIGIO   23      /* input/output possible signal */
   79 #endif
   80 #define SIGXCPU 24      /* exceeded CPU time limit */
   81 #define SIGXFSZ 25      /* exceeded file size limit */
   82 #define SIGVTALRM 26    /* virtual time alarm */
   83 #define SIGPROF 27      /* profiling time alarm */
   84 #if __BSD_VISIBLE
   85 #define SIGWINCH 28     /* window size changes */
   86 #define SIGINFO 29      /* information request */
   87 #endif
   88 #define SIGUSR1 30      /* user defined signal 1 */
   89 #define SIGUSR2 31      /* user defined signal 2 */
   90 
   91 /*
   92  * Language spec says we must list exactly one parameter, even though we
   93  * actually supply three.  Ugh!
   94  */
   95 #define SIG_DFL         (void (*)(int))0
   96 #define SIG_IGN         (void (*)(int))1
   97 #define SIG_ERR         (void (*)(int))-1
   98 
   99 #if __POSIX_VISIBLE || __XPG_VISIBLE
  100 typedef unsigned int sigset_t;
  101 
  102 #include <sys/siginfo.h>
  103 
  104 /*
  105  * Signal vector "template" used in sigaction call.
  106  */
  107 struct  sigaction {
  108         union {         /* signal handler */
  109                 void    (*__sa_handler)(int);
  110                 void    (*__sa_sigaction)(int, siginfo_t *, void *);
  111         } __sigaction_u;
  112         sigset_t sa_mask;               /* signal mask to apply */
  113         int     sa_flags;               /* see signal options below */
  114 };
  115 
  116 /* if SA_SIGINFO is set, sa_sigaction is to be used instead of sa_handler. */
  117 #define sa_handler      __sigaction_u.__sa_handler
  118 #define sa_sigaction    __sigaction_u.__sa_sigaction
  119 
  120 #if __XPG_VISIBLE >= 500
  121 #define SA_ONSTACK      0x0001  /* take signal on signal stack */
  122 #define SA_RESTART      0x0002  /* restart system on signal return */
  123 #define SA_RESETHAND    0x0004  /* reset to SIG_DFL when taking signal */
  124 #define SA_NODEFER      0x0010  /* don't mask the signal we're delivering */
  125 #define SA_NOCLDWAIT    0x0020  /* don't create zombies (assign to pid 1) */
  126 #ifdef COMPAT_SUNOS
  127 #define SA_USERTRAMP    0x0100  /* do not bounce off kernel's sigtramp */
  128 #endif
  129 #endif /* __XPG_VISIBLE >= 500 */
  130 #define SA_NOCLDSTOP    0x0008  /* do not generate SIGCHLD on child stop */
  131 #if __POSIX_VISIBLE >= 199309 || __XPG_VISIBLE >= 500
  132 #define SA_SIGINFO      0x0040  /* generate siginfo_t */
  133 #endif
  134 
  135 /*
  136  * Flags for sigprocmask:
  137  */
  138 #define SIG_BLOCK       1       /* block specified signal set */
  139 #define SIG_UNBLOCK     2       /* unblock specified signal set */
  140 #define SIG_SETMASK     3       /* set specified signal set */
  141 #endif  /* __POSIX_VISIBLE || __XPG_VISIBLE */
  142 
  143 #if __BSD_VISIBLE
  144 typedef void (*sig_t)(int);     /* type of signal function */
  145 
  146 /*
  147  * 4.3 compatibility:
  148  * Signal vector "template" used in sigvec call.
  149  */
  150 struct  sigvec {
  151         void    (*sv_handler)(int);     /* signal handler */
  152         int     sv_mask;                /* signal mask to apply */
  153         int     sv_flags;               /* see signal options below */
  154 };
  155 #define SV_ONSTACK      SA_ONSTACK
  156 #define SV_INTERRUPT    SA_RESTART      /* same bit, opposite sense */
  157 #define SV_RESETHAND    SA_RESETHAND
  158 #define sv_onstack      sv_flags        /* isn't compatibility wonderful! */
  159 
  160 /*
  161  * Macro for converting signal number to a mask suitable for
  162  * sigblock().
  163  */
  164 #define sigmask(m)      (1 << ((m)-1))
  165 
  166 #define BADSIG          SIG_ERR
  167 
  168 #endif  /* __BSD_VISIBLE */
  169 
  170 #if __BSD_VISIBLE || __XPG_VISIBLE >= 420
  171 /*
  172  * Structure used in sigstack call.
  173  */
  174 struct  sigstack {
  175         void    *ss_sp;                 /* signal stack pointer */
  176         int     ss_onstack;             /* current status */
  177 };
  178 
  179 /*
  180  * Structure used in sigaltstack call.
  181  */
  182 typedef struct sigaltstack {
  183         void    *ss_sp;                 /* signal stack base */
  184         size_t  ss_size;                /* signal stack length */
  185         int     ss_flags;               /* SS_DISABLE and/or SS_ONSTACK */
  186 } stack_t;
  187 #define SS_ONSTACK      0x0001  /* take signals on alternate stack */
  188 #define SS_DISABLE      0x0004  /* disable taking signals on alternate stack */
  189 #define MINSIGSTKSZ     8192                    /* minimum allowable stack */
  190 #define SIGSTKSZ        (MINSIGSTKSZ + 32768)   /* recommended stack size */
  191 
  192 #ifdef _KERNEL
  193 struct osigaltstack {
  194         void    *ss_sp;                 /* signal stack base */
  195         int     ss_size;                /* signal stack length */
  196         int     ss_flags;               /* SS_DISABLE and/or SS_ONSTACK */
  197 };
  198 #endif
  199 
  200 typedef struct sigcontext ucontext_t;
  201 #endif /* __BSD_VISIBLE || __XPG_VISIBLE >= 420 */
  202 
  203 /*
  204  * For historical reasons; programs expect signal's return value to be
  205  * defined by <sys/signal.h>.
  206  */
  207 __BEGIN_DECLS
  208 void    (*signal(int, void (*)(int)))(int);
  209 __END_DECLS
  210 #endif  /* !_SYS_SIGNAL_H_ */

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