usr/src/sys.386bsd/sys/signalvar.h

/*
 * Copyright (c) 1991 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 7.1 (Berkeley) 5/9/91
 */

#ifndef _SIGNALVAR_H_           /* tmp for user.h */
#define _SIGNALVAR_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_oldmask;            /* saved mask from before sigpause */
        int     ps_flags;               /* signal flags, below */
        struct  sigstack ps_sigstack;   /* sp & on stack state variable */
        int     ps_sig;                 /* for core dump/debugger XXX */
        int     ps_code;                /* for core dump/debugger XXX */
};

#define ps_onstack      ps_sigstack.ss_onstack
#define ps_sigsp        ps_sigstack.ss_sp

/* signal flags */
#define SA_OLDMASK      0x01            /* need to restore mask before pause */

/* additional signal action values, used only temporarily/internally */
#define SIG_CATCH       (void (*)())2
#define SIG_HOLD        (void (*)())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 issig().
 */
#define CURSIG(p) \
        (((p)->p_sig == 0 || \
            ((p)->p_flag&STRC) == 0 && ((p)->p_sig &~ (p)->p_sigmask) == 0) ? \
            0 : issig(p))

/*
 * Clear a pending signal from a process.
 */
#define CLRSIG(p, sig)  { (p)->p_sig &= ~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|SA_STOP)  /* 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
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_TTYSTOP,             /* SIGTSTP */
        SA_IGNORE|SA_CONT,      /* SIGCONT */
        SA_IGNORE,              /* SIGCHLD */
        SA_TTYSTOP,             /* SIGTTIN */
        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 stopsigmask     (sigmask(SIGSTOP)|sigmask(SIGTSTP)|\
                         sigmask(SIGTTIN)|sigmask(SIGTTOU))
#define contsigmask     (sigmask(SIGCONT))

#endif /* SIGPROP */

#define sigcantmask     (sigmask(SIGKILL)|sigmask(SIGSTOP))

#ifdef KERNEL
/*
 * Machine-independent functions:
 */
void    siginit __P((struct proc *p));
void    execsigs __P((struct proc *p));
void    gsignal __P((int pgid, int sig));
void    pgsignal __P((struct pgrp *pgrp, int sig, int checkctty));
void    trapsignal __P((struct proc *p, int sig, unsigned code));
void    psignal __P((struct proc *p, int sig));
int     issig __P((struct proc *p));
void    psig __P((int sig));
int     coredump __P((struct proc *p));

/*
 * Machine-dependent functions:
 */
void    sendsig __P((sig_t action, int sig, int returnmask, unsigned code));
#endif  /* KERNEL */
#endif  /* !_SIGNALVAR_H_ */