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/i386/include/sigframe.h

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    1 /*-
    2  * Copyright (c) 1999 Marcel Moolenaar
    3  * 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  *    in this position and unchanged.
   11  * 2. Redistributions in binary form must reproduce the above copyright
   12  *    notice, this list of conditions and the following disclaimer in the
   13  *    documentation and/or other materials provided with the distribution.
   14  * 3. The name of the author may not be used to endorse or promote products
   15  *    derived from this software without specific prior written permission.
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   18  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   19  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   20  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   21  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   22  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   26  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   27  *
   28  * $FreeBSD: stable/4/sys/i386/include/sigframe.h 54120 1999-12-04 10:40:24Z marcel $
   29  */
   30 
   31 #ifndef _MACHINE_SIGFRAME_H_
   32 #define _MACHINE_SIGFRAME_H_
   33 
   34 /*
   35  * Signal frames, arguments passed to application signal handlers.
   36  */
   37 
   38 struct  osigframe {
   39         /*
   40          * The first four members may be used by applications.
   41          */
   42 
   43         register_t      sf_signum;
   44 
   45         /*
   46          * Either 'int' for old-style FreeBSD handler or 'siginfo_t *'
   47          * pointing to sf_siginfo for SA_SIGINFO handlers.
   48          */
   49         register_t      sf_arg2;
   50 
   51         /* Points to sf_siginfo.si_sc. */
   52         register_t      sf_scp;
   53 
   54         register_t      sf_addr;
   55 
   56         /*
   57          * The following arguments are not constrained by the
   58          * function call protocol.
   59          * Applications are not supposed to access these members,
   60          * except using the pointers we provide in the first three
   61          * arguments.
   62          */
   63 
   64         union {
   65                 __osiginfohandler_t     *sf_action;
   66                 __sighandler_t          *sf_handler;
   67         } sf_ahu;
   68 
   69         /* In the SA_SIGINFO case, sf_arg2 points here. */
   70         osiginfo_t      sf_siginfo;
   71 };
   72 
   73 struct sigframe {
   74         /*
   75          * The first four members may be used by applications.
   76          *
   77          * NOTE: The 4th argument is undocumented, ill commented
   78          * on and seems to be somewhat BSD "standard".  Handlers
   79          * installed with sigvec may be using it.
   80          */
   81         register_t      sf_signum;
   82         register_t      sf_siginfo;     /* code or pointer to sf_si */
   83         register_t      sf_ucontext;    /* points to sf_uc */
   84         register_t      sf_addr;        /* undocumented 4th arg */
   85 
   86         union {
   87                 __siginfohandler_t      *sf_action;
   88                 __sighandler_t          *sf_handler;
   89         } sf_ahu;
   90         ucontext_t      sf_uc;          /* = *sf_ucontext */
   91         siginfo_t       sf_si;          /* = *sf_siginfo (SA_SIGINFO case) */
   92 };
   93 
   94 #endif /* !_MACHINE_SIGFRAME_H_ */

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