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: releng/9.0/sys/i386/include/sigframe.h 105950 2002-10-25 19:10:58Z peter $
   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 #ifdef _KERNEL
   38 #ifdef COMPAT_43
   39 struct osigframe {
   40         /*
   41          * The first four members may be used by applications.
   42          */
   43 
   44         register_t      sf_signum;
   45 
   46         /*
   47          * Either 'int' for old-style FreeBSD handler or 'siginfo_t *'
   48          * pointing to sf_siginfo for SA_SIGINFO handlers.
   49          */
   50         register_t      sf_arg2;
   51 
   52         /* Points to sf_siginfo.si_sc. */
   53         register_t      sf_scp;
   54 
   55         register_t      sf_addr;
   56 
   57         /*
   58          * The following arguments are not constrained by the
   59          * function call protocol.
   60          * Applications are not supposed to access these members,
   61          * except using the pointers we provide in the first three
   62          * arguments.
   63          */
   64 
   65         union {
   66                 __osiginfohandler_t     *sf_action;
   67                 __sighandler_t          *sf_handler;
   68         } sf_ahu;
   69 
   70         /* In the SA_SIGINFO case, sf_arg2 points here. */
   71         osiginfo_t      sf_siginfo;
   72 };
   73 #endif
   74 #ifdef COMPAT_FREEBSD4
   75 /* FreeBSD 4.x */
   76 struct sigframe4 {
   77         register_t      sf_signum;
   78         register_t      sf_siginfo;     /* code or pointer to sf_si */
   79         register_t      sf_ucontext;    /* points to sf_uc */
   80         register_t      sf_addr;        /* undocumented 4th arg */
   81 
   82         union {
   83                 __siginfohandler_t      *sf_action;
   84                 __sighandler_t          *sf_handler;
   85         } sf_ahu;
   86         struct ucontext4 sf_uc;         /* = *sf_ucontext */
   87         siginfo_t       sf_si;          /* = *sf_siginfo (SA_SIGINFO case) */
   88 };
   89 #endif
   90 #endif
   91 
   92 struct sigframe {
   93         /*
   94          * The first four members may be used by applications.
   95          *
   96          * NOTE: The 4th argument is undocumented, ill commented
   97          * on and seems to be somewhat BSD "standard".  Handlers
   98          * installed with sigvec may be using it.
   99          */
  100         register_t      sf_signum;
  101         register_t      sf_siginfo;     /* code or pointer to sf_si */
  102         register_t      sf_ucontext;    /* points to sf_uc */
  103         register_t      sf_addr;        /* undocumented 4th arg */
  104 
  105         union {
  106                 __siginfohandler_t      *sf_action;
  107                 __sighandler_t          *sf_handler;
  108         } sf_ahu;
  109         ucontext_t      sf_uc;          /* = *sf_ucontext */
  110         siginfo_t       sf_si;          /* = *sf_siginfo (SA_SIGINFO case) */
  111 };
  112 
  113 #endif /* !_MACHINE_SIGFRAME_H_ */

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