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

     /*
      * Copyright (c) 1991, 1993
      *      The Regents of the University of California.  All rights reserved.
      *
      * 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.
     *
     *      @(#)signalvar.h 8.6 (Berkeley) 2/19/95
     * $FreeBSD$
     */
    
    #ifndef _SYS_SIGNALVAR_H_               /* tmp for user.h */
    #define _SYS_SIGNALVAR_H_
    
    #include <sys/signal.h>
    
    /*
     * Kernel signal definitions and data structures,
     * not exported to user programs.
     */
    
    /*
     * Process signal actions and state, needed only within the process
     * (not necessarily resident).
     */
    struct  sigacts {
            sig_t   ps_sigact[NSIG];        /* disposition of signals */
            sigset_t ps_catchmask[NSIG];    /* signals to be blocked */
            sigset_t ps_sigonstack;         /* signals to take on sigstack */
            sigset_t ps_sigintr;            /* signals that interrupt syscalls */
            sigset_t ps_sigreset;           /* signals that reset when caught */
            sigset_t ps_signodefer;         /* signals not masked while handled */
            int     ps_flags;               /* signal flags, below */
            struct  sigaltstack ps_sigstk;  /* sp & on stack state variable */
            sigset_t ps_usertramp;          /* SunOS compat; libc sigtramp XXX */
    };
    
    /* signal flags */
    #define SAS_OLDMASK     0x01            /* need to restore mask before pause */
    #define SAS_ALTSTACK    0x02            /* have alternate signal stack */
    
    /* additional signal action values, used only temporarily/internally */
    #define SIG_CATCH       ((__sighandler_t *)2)
    #define SIG_HOLD        ((__sighandler_t *)3)
    
    /*
     * get signal action for process and signal; currently only for current process
     */
    #define SIGACTION(p, sig)       (p->p_sigacts->ps_sigact[(sig)])
    
    /*
     * Determine signal that should be delivered to process p, the current
     * process, 0 if none.  If there is a pending stop signal with default
     * action, the process stops in issignal().
     */
    #define CURSIG(p)                                                       \
            (((p)->p_siglist == 0 ||                                        \
                (((p)->p_flag & P_TRACED) == 0 &&                           \
                 ((p)->p_siglist & ~(p)->p_sigmask) == 0)) ?                \
                0 : issignal(p))
    
    /*
     * Clear a pending signal from a process.
     */
    #define CLRSIG(p, sig)  { (p)->p_siglist &= ~sigmask(sig); }
    
    /*
     * Signal properties and actions.
     * The array below categorizes the signals and their default actions
     * according to the following properties:
     */
    #define SA_KILL         0x01            /* terminates process by default */
    #define SA_CORE         0x02            /* ditto and coredumps */
    #define SA_STOP         0x04            /* suspend process */
   #define SA_TTYSTOP      0x08            /* ditto, from tty */
   #define SA_IGNORE       0x10            /* ignore by default */
   #define SA_CONT         0x20            /* continue if suspended */
   #define SA_CANTMASK     0x40            /* non-maskable, catchable */
   
   #ifdef  SIGPROP
   static int sigprop[NSIG + 1] = {
           0,                      /* unused */
           SA_KILL,                /* SIGHUP */
           SA_KILL,                /* SIGINT */
           SA_KILL|SA_CORE,        /* SIGQUIT */
           SA_KILL|SA_CORE,        /* SIGILL */
           SA_KILL|SA_CORE,        /* SIGTRAP */
           SA_KILL|SA_CORE,        /* SIGABRT */
           SA_KILL|SA_CORE,        /* SIGEMT */
           SA_KILL|SA_CORE,        /* SIGFPE */
           SA_KILL,                /* SIGKILL */
           SA_KILL|SA_CORE,        /* SIGBUS */
           SA_KILL|SA_CORE,        /* SIGSEGV */
           SA_KILL|SA_CORE,        /* SIGSYS */
           SA_KILL,                /* SIGPIPE */
           SA_KILL,                /* SIGALRM */
           SA_KILL,                /* SIGTERM */
           SA_IGNORE,              /* SIGURG */
           SA_STOP,                /* SIGSTOP */
           SA_STOP|SA_TTYSTOP,     /* SIGTSTP */
           SA_IGNORE|SA_CONT,      /* SIGCONT */
           SA_IGNORE,              /* SIGCHLD */
           SA_STOP|SA_TTYSTOP,     /* SIGTTIN */
           SA_STOP|SA_TTYSTOP,     /* SIGTTOU */
           SA_IGNORE,              /* SIGIO */
           SA_KILL,                /* SIGXCPU */
           SA_KILL,                /* SIGXFSZ */
           SA_KILL,                /* SIGVTALRM */
           SA_KILL,                /* SIGPROF */
           SA_IGNORE,              /* SIGWINCH  */
           SA_IGNORE,              /* SIGINFO */
           SA_KILL,                /* SIGUSR1 */
           SA_KILL,                /* SIGUSR2 */
   };
   
   #define contsigmask     (sigmask(SIGCONT))
   #define stopsigmask     (sigmask(SIGSTOP) | sigmask(SIGTSTP) | \
                               sigmask(SIGTTIN) | sigmask(SIGTTOU))
   
   #endif /* SIGPROP */
   
   #define sigcantmask     (sigmask(SIGKILL) | sigmask(SIGSTOP))
   
   #ifdef KERNEL
   struct pgrp;
   struct proc;
   struct sigio;
   
   extern int sugid_coredump;      /* Sysctl variable kern.sugid_coredump */
   
   /*
    * Machine-independent functions:
    */
   void    execsigs __P((struct proc *p));
   void    gsignal __P((int pgid, int sig));
   int     issignal __P((struct proc *p));
   void    killproc __P((struct proc *p, char *why));
   void    pgsigio __P((struct sigio *, int signum, int checkctty));
   void    pgsignal __P((struct pgrp *pgrp, int sig, int checkctty));
   void    postsig __P((int sig));
   void    psignal __P((struct proc *p, int sig));
   void    sigexit __P((struct proc *p, int signum));
   void    siginit __P((struct proc *p));
   void    trapsignal __P((struct proc *p, int sig, u_long code));
   void check_sigacts (void);
   /*
    * Machine-dependent functions:
    */
   void    sendsig __P((sig_t action, int sig, int returnmask, u_long code));
   #endif  /* KERNEL */
   #endif  /* !_SYS_SIGNALVAR_H_ */

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