sys/sigtramp.c

   1 /*
   2  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * The contents of this file constitute Original Code as defined in and
   7  * are subject to the Apple Public Source License Version 1.1 (the
   8  * "License").  You may not use this file except in compliance with the
   9  * License.  Please obtain a copy of the License at
  10  * http://www.apple.com/publicsource and read it before using this file.
  11  *
  12  * This Original Code and all software distributed under the License are
  13  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  14  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  15  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
  17  * License for the specific language governing rights and limitations
  18  * under the License.
  19  *
  20  * @APPLE_LICENSE_HEADER_END@
  21  */
  22 /*
  23  * Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved
  24  */
  25 #import "sigcatch.h"
  26 #import <signal.h>
  27 #import <sys/signal.h>
  28 #import <ucontext.h>
  29
  30 /*
  31  * sigvec registers _sigtramp as the handler for any signal requiring
  32  * user-mode intervention.  All _sigtramp does is find the real handler,
  33  * calls it, then sigreturn's.
  34  *
  35  * Note that the kernel saves/restores all of our register state.
  36  */
  37 #if defined(__DYNAMIC__)
  38 int __in_sigtramp = 0;
  39 #endif
  40
  41 void
  42 _sigtramp(
  43         union __sigaction_u __sigaction_u,
  44         int                     sigstyle,
  45         int                     sig,
  46         siginfo_t               *sinfo,
  47         struct ucontext         *uctx
  48 ) {
  49
  50 #if defined(__DYNAMIC__)
  51         __in_sigtramp++;
  52 #endif
  53         if (sigstyle == 1)
  54                 sa_handler(sig);
  55 #ifdef __ppc__
  56         else
  57                 sa_sigaction(sig, sinfo, uctx);
  58 #endif /* __ppc__ */
  59
  60 #if defined(__DYNAMIC__)
  61         __in_sigtramp--;
  62 #endif
  63         sigreturn(uctx);
  64 }