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

     /*      $OpenBSD: signalvar.h,v 1.54 2022/05/13 15:32:00 claudio Exp $  */
     /*      $NetBSD: signalvar.h,v 1.17 1996/04/22 01:23:31 christos Exp $  */
     
     /*
      * 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. 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 8.3 (Berkeley) 1/4/94
     */
    
    #ifndef _SYS_SIGNALVAR_H_               /* tmp for user.h */
    #define _SYS_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).
     *
     * Locks used to protect struct members in struct sigacts:
     *      a       atomic operations
     *      m       this process' `ps_mtx'
     */
    struct  sigacts {
            sig_t   ps_sigact[NSIG];        /* [m] disposition of signals */
            sigset_t ps_catchmask[NSIG];    /* [m] signals to be blocked */
            sigset_t ps_sigonstack;         /* [m] signals to take on sigstack */
            sigset_t ps_sigintr;            /* [m] signals interrupt syscalls */
            sigset_t ps_sigreset;           /* [m] signals that reset when caught */
            sigset_t ps_siginfo;            /* [m] signals that provide siginfo */
            sigset_t ps_sigignore;          /* [m] signals being ignored */
            sigset_t ps_sigcatch;           /* [m] signals being caught by user */
            int     ps_sigflags;            /* [a] signal flags, below */
    };
    
    /* signal flags */
    #define SAS_NOCLDSTOP   0x01    /* No SIGCHLD when children stop. */
    #define SAS_NOCLDWAIT   0x02    /* No zombies if child dies */
    
    /* additional signal action values, used only temporarily/internally */
    #define SIG_CATCH       (void (*)(int))2
    #define SIG_HOLD        (void (*)(int))3
    
    /*
     * Check if process p has an unmasked signal pending.
     * Return mask of pending signals.
     */
    #define SIGPENDING(p)                                                   \
            (((p)->p_siglist | (p)->p_p->ps_siglist) & ~(p)->p_sigmask)
    
    /*
     * Signal properties and actions.
     */
    #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 */
    
    #define sigcantmask     (sigmask(SIGKILL) | sigmask(SIGSTOP))
    
    #ifdef _KERNEL
    enum signal_type { SPROCESS, STHREAD, SPROPAGATED };
    
    struct sigio_ref;
    
    struct sigctx {
            sig_t           sig_action;
            sigset_t        sig_catchmask;
            int             sig_onstack;
           int             sig_intr;
           int             sig_reset;
           int             sig_info;
           int             sig_ignore;
           int             sig_catch;
   };
   
   /*
    * Machine-independent functions:
    */
   int     coredump(struct proc *p);
   void    execsigs(struct proc *p);
   int     cursig(struct proc *p, struct sigctx *);
   void    pgsigio(struct sigio_ref *sir, int sig, int checkctty);
   void    pgsignal(struct pgrp *pgrp, int sig, int checkctty);
   void    psignal(struct proc *p, int sig);
   void    ptsignal(struct proc *p, int sig, enum signal_type type);
   #define prsignal(pr,sig)        ptsignal((pr)->ps_mainproc, (sig), SPROCESS)
   void    trapsignal(struct proc *p, int sig, u_long code, int type,
               union sigval val);
   __dead void sigexit(struct proc *, int);
   void    sigabort(struct proc *);
   int     sigismasked(struct proc *, int);
   int     sigonstack(size_t);
   int     killpg1(struct proc *, int, int, int);
   
   void    signal_init(void);
   
   void    sigstkinit(struct sigaltstack *);
   struct sigacts  *sigactsinit(struct process *);
   void    sigactsfree(struct sigacts *);
   void    siginit(struct sigacts *);
   
   /*
    * Machine-dependent functions:
    */
   int     sendsig(sig_t _catcher, int _sig, sigset_t _mask, const siginfo_t *_si,
               int _info, int _onstack);
   #endif  /* _KERNEL */
   #endif  /* !_SYS_SIGNALVAR_H_ */

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