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

     /*
      * Copyright (c) 2000-2002 Apple Computer, Inc. All rights reserved.
      *
      * @APPLE_LICENSE_HEADER_START@
      * 
      * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
      * 
      * This file contains Original Code and/or Modifications of Original Code
      * as defined in and that are subject to the Apple Public Source License
     * Version 2.0 (the 'License'). You may not use this file except in
     * compliance with the License. Please obtain a copy of the License at
     * http://www.opensource.apple.com/apsl/ and read it before using this
     * file.
     * 
     * The Original Code and all software distributed under the License are
     * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
     * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
     * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
     * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
     * Please see the License for the specific language governing rights and
     * limitations under the License.
     * 
     * @APPLE_LICENSE_HEADER_END@
     */
    /* Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved */
    /*
     * 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 8.3 (Berkeley) 1/4/94
     */
    
    #ifndef _SYS_SIGNALVAR_H_               /* tmp for user.h */
    #define _SYS_SIGNALVAR_H_
    
    #include <sys/appleapiopts.h>
    
    #ifdef __APPLE_API_PRIVATE
    /*
     * 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 */
            sig_t   ps_trampact[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_siginfo;            /* signals that want SA_SIGINFO args */
            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 */
            int     ps_code;                /* for core dump/debugger XXX */
            int     ps_addr;                /* for core dump/debugger XXX */
            sigset_t ps_usertramp;          /* SunOS compat; libc sigtramp XXX */
            sigset_t ps_64regset;           /* signals that want SA_EXSIGINFO args */
    };
    
    /* 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       (void (*)())2
   #define SIG_HOLD        (void (*)())3
   #define SIG_WAIT        (void (*)())4
   
   #define pgsigio(pgid, sig, notused) \
           { \
           struct proc *p; \
           if (pgid < 0) \
                   gsignal(-(pgid), sig);\
           else if (pgid > 0 && (p = pfind(pgid)) != 0) \
                   psignal(p, sig); \
   }
   
   /*
    * get signal action for process and signal; currently only for current process
    */
   #define SIGACTION(p, sig)       (p->p_sigacts->ps_sigact[(sig)])
   
   /*
    *      Check for per-process and per thread signals.
    */
   #define SHOULDissignal(p,uthreadp) \
            (((uthreadp)->uu_siglist)      \
             & ~((((uthreadp)->uu_sigmask) \
                  | (((p)->p_flag & P_TRACED) ? 0 : (p)->p_sigignore)) \
                 & ~sigcantmask))
   
   /*
    *      Check for signals and per-thread signals.  
    *  Use in trap() and syscall() before
    *      exiting kernel.
    */
   #define CHECK_SIGNALS(p, thread, uthreadp)      \
           (!thread_should_halt(thread)    \
            && (SHOULDissignal(p,uthreadp)))
   
   /*
    * 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
   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:
    */
   int     coredump __P((struct proc *p));
   void    execsigs __P((struct proc *p, thread_act_t thr_act));
   void    gsignal __P((int pgid, int sig));
   int     issignal __P((struct proc *p));
   int     CURSIG __P((struct proc *p));
   int clear_procsiglist __P((struct proc *p, int bit));
   int clear_procsigmask __P((struct proc *p, int bit));
   int set_procsigmask __P((struct proc *p, int bit));
   void    tty_pgsignal __P((struct pgrp *pgrp, int sig));
   void    postsig __P((int sig));
   void    siginit __P((struct proc *p));
   void    trapsignal __P((struct proc *p, int sig, unsigned code));
   void    pt_setrunnable __P((struct proc *p));
   
   /*
    * Machine-dependent functions:
    */
   void    sendsig __P((struct proc *, sig_t action, int sig,
           int returnmask, u_long code));
   
   #ifdef __APPLE_API_UNSTABLE
   void    psignal __P((struct proc *p, int sig));
   void    pgsignal __P((struct pgrp *pgrp, int sig, int checkctty));
   #endif /* __APPLE_API_UNSTABLE */
   
   #endif  /* KERNEL */
   
   #endif /* __APPLE_API_PRIVATE */
   
   #endif  /* !_SYS_SIGNALVAR_H_ */

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