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/signalvar.h

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    1 /*
    2  * Copyright (c) 1991, 1993
    3  *      The Regents of the University of California.  All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  * 3. All advertising materials mentioning features or use of this software
   14  *    must display the following acknowledgement:
   15  *      This product includes software developed by the University of
   16  *      California, Berkeley and its contributors.
   17  * 4. Neither the name of the University nor the names of its contributors
   18  *    may be used to endorse or promote products derived from this software
   19  *    without specific prior written permission.
   20  *
   21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   31  * SUCH DAMAGE.
   32  *
   33  *      @(#)signalvar.h 8.6 (Berkeley) 2/19/95
   34  * $FreeBSD: src/sys/sys/signalvar.h,v 1.13.4.1 1999/09/05 08:22:54 peter Exp $
   35  */
   36 
   37 #ifndef _SYS_SIGNALVAR_H_               /* tmp for user.h */
   38 #define _SYS_SIGNALVAR_H_
   39 
   40 /*
   41  * Kernel signal definitions and data structures,
   42  * not exported to user programs.
   43  */
   44 
   45 /*
   46  * Process signal actions and state, needed only within the process
   47  * (not necessarily resident).
   48  */
   49 struct  sigacts {
   50         sig_t   ps_sigact[NSIG];        /* disposition of signals */
   51         sigset_t ps_catchmask[NSIG];    /* signals to be blocked */
   52         sigset_t ps_sigonstack;         /* signals to take on sigstack */
   53         sigset_t ps_sigintr;            /* signals that interrupt syscalls */
   54         sigset_t ps_sigreset;           /* signals that reset when caught */
   55         sigset_t ps_signodefer;         /* signals not masked while handled */
   56         sigset_t ps_oldmask;            /* saved mask from before sigpause */
   57         int     ps_flags;               /* signal flags, below */
   58         struct  sigaltstack ps_sigstk;  /* sp & on stack state variable */
   59         int     ps_sig;                 /* for core dump/debugger XXX */
   60         u_long  ps_code;                /* for core dump/debugger XXX */
   61         sigset_t ps_usertramp;          /* SunOS compat; libc sigtramp XXX */
   62 };
   63 
   64 /* signal flags */
   65 #define SAS_OLDMASK     0x01            /* need to restore mask before pause */
   66 #define SAS_ALTSTACK    0x02            /* have alternate signal stack */
   67 
   68 /* additional signal action values, used only temporarily/internally */
   69 #define SIG_CATCH       ((__sighandler_t *)2)
   70 #define SIG_HOLD        ((__sighandler_t *)3)
   71 
   72 /*
   73  * get signal action for process and signal; currently only for current process
   74  */
   75 #define SIGACTION(p, sig)       (p->p_sigacts->ps_sigact[(sig)])
   76 
   77 /*
   78  * Determine signal that should be delivered to process p, the current
   79  * process, 0 if none.  If there is a pending stop signal with default
   80  * action, the process stops in issignal().
   81  */
   82 #define CURSIG(p)                                                       \
   83         (((p)->p_siglist == 0 ||                                        \
   84             (((p)->p_flag & P_TRACED) == 0 &&                           \
   85              ((p)->p_siglist & ~(p)->p_sigmask) == 0)) ?                \
   86             0 : issignal(p))
   87 
   88 /*
   89  * Clear a pending signal from a process.
   90  */
   91 #define CLRSIG(p, sig)  { (p)->p_siglist &= ~sigmask(sig); }
   92 
   93 /*
   94  * Signal properties and actions.
   95  * The array below categorizes the signals and their default actions
   96  * according to the following properties:
   97  */
   98 #define SA_KILL         0x01            /* terminates process by default */
   99 #define SA_CORE         0x02            /* ditto and coredumps */
  100 #define SA_STOP         0x04            /* suspend process */
  101 #define SA_TTYSTOP      0x08            /* ditto, from tty */
  102 #define SA_IGNORE       0x10            /* ignore by default */
  103 #define SA_CONT         0x20            /* continue if suspended */
  104 #define SA_CANTMASK     0x40            /* non-maskable, catchable */
  105 
  106 #ifdef  SIGPROP
  107 static int sigprop[NSIG + 1] = {
  108         0,                      /* unused */
  109         SA_KILL,                /* SIGHUP */
  110         SA_KILL,                /* SIGINT */
  111         SA_KILL|SA_CORE,        /* SIGQUIT */
  112         SA_KILL|SA_CORE,        /* SIGILL */
  113         SA_KILL|SA_CORE,        /* SIGTRAP */
  114         SA_KILL|SA_CORE,        /* SIGABRT */
  115         SA_KILL|SA_CORE,        /* SIGEMT */
  116         SA_KILL|SA_CORE,        /* SIGFPE */
  117         SA_KILL,                /* SIGKILL */
  118         SA_KILL|SA_CORE,        /* SIGBUS */
  119         SA_KILL|SA_CORE,        /* SIGSEGV */
  120         SA_KILL|SA_CORE,        /* SIGSYS */
  121         SA_KILL,                /* SIGPIPE */
  122         SA_KILL,                /* SIGALRM */
  123         SA_KILL,                /* SIGTERM */
  124         SA_IGNORE,              /* SIGURG */
  125         SA_STOP,                /* SIGSTOP */
  126         SA_STOP|SA_TTYSTOP,     /* SIGTSTP */
  127         SA_IGNORE|SA_CONT,      /* SIGCONT */
  128         SA_IGNORE,              /* SIGCHLD */
  129         SA_STOP|SA_TTYSTOP,     /* SIGTTIN */
  130         SA_STOP|SA_TTYSTOP,     /* SIGTTOU */
  131         SA_IGNORE,              /* SIGIO */
  132         SA_KILL,                /* SIGXCPU */
  133         SA_KILL,                /* SIGXFSZ */
  134         SA_KILL,                /* SIGVTALRM */
  135         SA_KILL,                /* SIGPROF */
  136         SA_IGNORE,              /* SIGWINCH  */
  137         SA_IGNORE,              /* SIGINFO */
  138         SA_KILL,                /* SIGUSR1 */
  139         SA_KILL,                /* SIGUSR2 */
  140 };
  141 
  142 #define contsigmask     (sigmask(SIGCONT))
  143 #define stopsigmask     (sigmask(SIGSTOP) | sigmask(SIGTSTP) | \
  144                             sigmask(SIGTTIN) | sigmask(SIGTTOU))
  145 
  146 #endif /* SIGPROP */
  147 
  148 #define sigcantmask     (sigmask(SIGKILL) | sigmask(SIGSTOP))
  149 
  150 #ifdef KERNEL
  151 /*
  152  * Machine-independent functions:
  153  */
  154 void    execsigs __P((struct proc *p));
  155 void    gsignal __P((int pgid, int sig));
  156 int     issignal __P((struct proc *p));
  157 void    killproc __P((struct proc *p, char *why));
  158 void    pgsignal __P((struct pgrp *pgrp, int sig, int checkctty));
  159 void    postsig __P((int sig));
  160 void    psignal __P((struct proc *p, int sig));
  161 void    setsigvec __P((struct proc *p, int signum, struct sigaction *sa));
  162 void    sigexit __P((struct proc *p, int signum));
  163 void    siginit __P((struct proc *p));
  164 void    trapsignal __P((struct proc *p, int sig, u_long code));
  165 
  166 /*
  167  * Machine-dependent functions:
  168  */
  169 void    sendsig __P((sig_t action, int sig, int returnmask, u_long code));
  170 #endif  /* KERNEL */
  171 #endif  /* !_SYS_SIGNALVAR_H_ */

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