FreeBSD/Linux Kernel Cross Reference
sys/sys/signal.h

     /*
      * Copyright (c) 1982, 1986, 1989, 1991, 1993
      *      The Regents of the University of California.  All rights reserved.
      * (c) UNIX System Laboratories, Inc.
      * All or some portions of this file are derived from material licensed
      * to the University of California by American Telephone and Telegraph
      * Co. or Unix System Laboratories, Inc. and are reproduced herein with
      * the permission of UNIX System Laboratories, Inc.
      *
     * Redistribution and use in source and binary forms, with or without
     * modification, are permitted provided that the following conditions
     * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 3. All advertising materials mentioning features or use of this software
     *    must display the following acknowledgement:
     *      This product includes software developed by the University of
     *      California, Berkeley and its contributors.
     * 4. Neither the name of the University nor the names of its contributors
     *    may be used to endorse or promote products derived from this software
     *    without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     *      @(#)signal.h    8.4 (Berkeley) 5/4/95
     * $FreeBSD$
     */
    
    #ifndef _SYS_SIGNAL_H_
    #define _SYS_SIGNAL_H_
    
    #include <sys/cdefs.h>
    #include <sys/_posix.h>
    
    /*
     * sigset_t macros.
     */
    #define _SIG_WORDS      4
    #define _SIG_MAXSIG     128
    #define _SIG_IDX(sig)   ((sig) - 1)
    #define _SIG_WORD(sig)  (_SIG_IDX(sig) >> 5)
    #define _SIG_BIT(sig)   (1 << (_SIG_IDX(sig) & 31))
    #define _SIG_VALID(sig) ((sig) < _SIG_MAXSIG && (sig) > 0)
    
    /*
     * System defined signals.
     */
    #define SIGHUP          1       /* hangup */
    #define SIGINT          2       /* interrupt */
    #define SIGQUIT         3       /* quit */
    #define SIGILL          4       /* illegal instr. (not reset when caught) */
    #ifndef _POSIX_SOURCE
    #define SIGTRAP         5       /* trace trap (not reset when caught) */
    #endif
    #define SIGABRT         6       /* abort() */
    #ifndef _POSIX_SOURCE
    #define SIGIOT          SIGABRT /* compatibility */
    #define SIGEMT          7       /* EMT instruction */
    #endif
    #define SIGFPE          8       /* floating point exception */
    #define SIGKILL         9       /* kill (cannot be caught or ignored) */
    #ifndef _POSIX_SOURCE
    #define SIGBUS          10      /* bus error */
    #endif
    #define SIGSEGV         11      /* segmentation violation */
    #ifndef _POSIX_SOURCE
    #define SIGSYS          12      /* non-existent system call invoked */
    #endif
    #define SIGPIPE         13      /* write on a pipe with no one to read it */
    #define SIGALRM         14      /* alarm clock */
    #define SIGTERM         15      /* software termination signal from kill */
    #ifndef _POSIX_SOURCE
    #define SIGURG          16      /* urgent condition on IO channel */
    #endif
    #define SIGSTOP         17      /* sendable stop signal not from tty */
    #define SIGTSTP         18      /* stop signal from tty */
    #define SIGCONT         19      /* continue a stopped process */
    #define SIGCHLD         20      /* to parent on child stop or exit */
    #define SIGTTIN         21      /* to readers pgrp upon background tty read */
    #define SIGTTOU         22      /* like TTIN if (tp->t_local&LTOSTOP) */
    #ifndef _POSIX_SOURCE
    #define SIGIO           23      /* input/output possible signal */
    #define SIGXCPU         24      /* exceeded CPU time limit */
    #define SIGXFSZ         25      /* exceeded file size limit */
    #define SIGVTALRM       26      /* virtual time alarm */
    #define SIGPROF         27      /* profiling time alarm */
   #define SIGWINCH        28      /* window size changes */
   #define SIGINFO         29      /* information request */
   #endif
   #define SIGUSR1         30      /* user defined signal 1 */
   #define SIGUSR2         31      /* user defined signal 2 */
   
   /*-
    * Type of a signal handling function.
    *
    * Language spec sez signal handlers take exactly one arg, even though we
    * actually supply three.  Ugh!
    *
    * We don't try to hide the difference by leaving out the args because
    * that would cause warnings about conformant programs.  Nonconformant
    * programs can avoid the warnings by casting to (__sighandler_t *) or
    * sig_t before calling signal() or assigning to sa_handler or sv_handler.
    *
    * The kernel should reverse the cast before calling the function.  It
    * has no way to do this, but on most machines 1-arg and 3-arg functions
    * have the same calling protocol so there is no problem in practice.
    * A bit in sa_flags could be used to specify the number of args.
    */
   typedef void __sighandler_t __P((int));
   
   #define SIG_DFL         ((__sighandler_t *)0)
   #define SIG_IGN         ((__sighandler_t *)1)
   #define SIG_ERR         ((__sighandler_t *)-1)
   
   #if defined(_P1003_1B_VISIBLE) || defined(_KERNEL)
   union sigval {
           /* Members as suggested by Annex C of POSIX 1003.1b. */
           int     sigval_int;
           void    *sigval_ptr;
   };
   
   struct sigevent {
           int     sigev_notify;           /* Notification type */
           union {
                   int     __sigev_signo;  /* Signal number */
                   int     __sigev_notify_kqueue;
           } __sigev_u;
           union sigval sigev_value;       /* Signal value */
   };
   #define sigev_signo             __sigev_u.__sigev_signo
   #define sigev_notify_kqueue     __sigev_u.__sigev_notify_kqueue
   
   #define SIGEV_NONE      0               /* No async notification */
   #define SIGEV_SIGNAL    1               /* Generate a queued signal */
   #define SIGEV_KEVENT    3               /* Generate a kevent */
   
   typedef struct __siginfo {
           int     si_signo;               /* signal number */
           int     si_errno;               /* errno association */
           /*
            * Cause of signal, one of the SI_ macros or signal-specific
            * values, i.e. one of the FPE_... values for SIGFPE. This
            * value is equivalent to the second argument to an old-style
            * FreeBSD signal handler.
            */
           int     si_code;                /* signal code */
           int     si_pid;                 /* sending process */
           unsigned int si_uid;            /* sender's ruid */
           int     si_status;              /* exit value */
           void    *si_addr;               /* faulting instruction */
           union sigval si_value;          /* signal value */
           long    si_band;                /* band event for SIGPOLL */
           int     __spare__[7];           /* gimme some slack */
   } siginfo_t;
   #endif /* _P1003_1B_VISIBLE */
   
   typedef struct __sigset {
           unsigned int    __bits[_SIG_WORDS];
   } sigset_t;
   
   /*
    * XXX - there are some nasty dependencies on include file order. Now that
    * sigset_t has been defined we can include the MD header.
    */     
   #include <machine/signal.h>     /* sig_atomic_t; trap codes; sigcontext */
   
   #if !defined(_ANSI_SOURCE)
   
   struct __siginfo;
   
   /*
    * Signal vector "template" used in sigaction call.
    */
   struct  sigaction {
           union {
                   void    (*__sa_handler) __P((int));
                   void    (*__sa_sigaction) __P((int, struct __siginfo *,
                                                  void *));
           } __sigaction_u;                /* signal handler */
           int     sa_flags;               /* see signal options below */
           sigset_t sa_mask;               /* signal mask to apply */
   };
   
   /* if SA_SIGINFO is set, sa_sigaction is to be used instead of sa_handler. */
   #define sa_handler      __sigaction_u.__sa_handler
   
   #define SA_NOCLDSTOP    0x0008  /* do not generate SIGCHLD on child stop */
   
   #if !defined(_POSIX_SOURCE)
   
   #define sa_sigaction    __sigaction_u.__sa_sigaction
   
   #define SA_ONSTACK      0x0001  /* take signal on signal stack */
   #define SA_RESTART      0x0002  /* restart system call on signal return */
   #define SA_RESETHAND    0x0004  /* reset to SIG_DFL when taking signal */
   #define SA_NODEFER      0x0010  /* don't mask the signal we're delivering */
   #define SA_NOCLDWAIT    0x0020  /* don't keep zombies around */
   #define SA_SIGINFO      0x0040  /* signal handler with SA_SIGINFO args */
   #ifdef COMPAT_SUNOS
   #define SA_USERTRAMP    0x0100  /* do not bounce off kernel's sigtramp */
   #endif
   
   #define NSIG            32      /* number of old signals (counting 0) */
   
   /* POSIX 1003.1b required values. */
   #define SI_USER         0x10001
   #define SI_QUEUE        0x10002
   #define SI_TIMER        0x10003
   #define SI_ASYNCIO      0x10004
   #define SI_MESGQ        0x10005
   
   /* Additional FreeBSD values. */
   #define SI_UNDEFINED    0
   
   typedef void __siginfohandler_t __P((int, struct __siginfo *, void *));
   
   typedef __sighandler_t  *sig_t; /* type of pointer to a signal function */
   
   #ifdef  _BSD_SIZE_T_
   typedef _BSD_SIZE_T_    size_t;
   #undef  _BSD_SIZE_T_
   #endif
   
   /*
    * Structure used in sigaltstack call.
    */
   typedef struct sigaltstack {
           char    *ss_sp;                 /* signal stack base */
           size_t  ss_size;                /* signal stack length */
           int     ss_flags;               /* SS_DISABLE and/or SS_ONSTACK */
   } stack_t;
   
   #define SS_ONSTACK      0x0001  /* take signal on alternate stack */
   #define SS_DISABLE      0x0004  /* disable taking signals on alternate stack */
   #define MINSIGSTKSZ     8192                    /* minimum allowable stack */
   #define SIGSTKSZ        (MINSIGSTKSZ + 32768)   /* recommended stack size */
   
   /* Have enough typedefs for this now.  XXX */
   #include <sys/ucontext.h>
   
   /*
    * 4.3 compatibility:
    * Signal vector "template" used in sigvec call.
    */
   struct  sigvec {
           __sighandler_t *sv_handler;     /* signal handler */
           int     sv_mask;                /* signal mask to apply */
           int     sv_flags;               /* see signal options below */
   };
   
   #define SV_ONSTACK      SA_ONSTACK
   #define SV_INTERRUPT    SA_RESTART      /* same bit, opposite sense */
   #define SV_RESETHAND    SA_RESETHAND
   #define SV_NODEFER      SA_NODEFER
   #define SV_NOCLDSTOP    SA_NOCLDSTOP
   #define SV_SIGINFO      SA_SIGINFO
   #define sv_onstack sv_flags     /* isn't compatibility wonderful! */
   
   /*
    * Structure used in sigstack call.
    */
   struct  sigstack {
           char    *ss_sp;                 /* signal stack pointer */
           int     ss_onstack;             /* current status */
   };
   
   /*
    * Macro for converting signal number to a mask suitable for
    * sigblock().
    */
   #define sigmask(m)      (1 << ((m)-1))
   
   #define BADSIG          SIG_ERR
   
   #endif /* !_POSIX_SOURCE */
   
   /*
    * Flags for sigprocmask:
    */
   #define SIG_BLOCK       1       /* block specified signal set */
   #define SIG_UNBLOCK     2       /* unblock specified signal set */
   #define SIG_SETMASK     3       /* set specified signal set */
   
   #endif /* !_ANSI_SOURCE */
   
   /*
    * For historical reasons; programs expect signal's return value to be
    * defined by <sys/signal.h>.
    */
   __BEGIN_DECLS
   __sighandler_t *signal __P((int, __sighandler_t *));
   __END_DECLS
   
   #endif  /* !_SYS_SIGNAL_H_ */

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