signalvar.h

Go to the documentation of this file.

/*
 * 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.
 * 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: src/sys/sys/signalvar.h,v 1.91 2010/07/08 19:15:26 jhb Exp $
 */
 

#ifndef _SYS_SIGNALVAR_H_
#define _SYS_SIGNALVAR_H_

/*
 * Kernel signal definitions and data structures,
 * not exported to user programs.
 */

#if !defined(__rtems__)
/*
 * 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 */
        sigset_t ps_oldmask;            /* saved mask from before sigpause */
        int     ps_flags;               /* signal flags, below */
        struct  sigaltstack ps_sigstk;  /* sp & on stack state variable */
        int     ps_sig;                 /* for core dump/debugger XXX */
        u_long  ps_code;                /* for core dump/debugger XXX */
        sigset_t ps_usertramp;          /* SunOS compat; libc sigtramp XXX */
};
#endif

/* 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)

#if !defined(__rtems__)
/*
 * get signal action for process and signal; currently only for current process
 */
#define SIGACTION(p, sig)       (p->p_sigacts->ps_sigact[(sig)])
#endif

/*
 * 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
/*
 * Machine-independent functions:
 */
void    execsigs(struct proc *p);
void    gsignal(int pgid, int sig);
int     issignal(struct proc *p);
void    killproc(struct proc *p, char *why);
void    pgsignal(struct pgrp *pgrp, int sig, int checkctty);
void    postsig(int sig);
#ifndef __rtems__
/* clashes with psignal(3) */
void    psignal(struct proc *p, int sig);
#endif
void    setsigvec(struct proc *p, int signum, struct sigaction *sa);
void    sigexit(struct proc *p, int signum);
void    siginit(struct proc *p);
void    trapsignal(struct proc *p, int sig, u_long code);

/*
 * Machine-dependent functions:
 */
void    sendsig(sig_t action, int sig, int returnmask, u_long code);
#endif  /* _KERNEL */

#endif  /* !_SYS_SIGNALVAR_H_ */