sys/sigtramp.c

   1 /*
   2  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
   7  *
   8  * This file contains Original Code and/or Modifications of Original Code
   9  * as defined in and that are subject to the Apple Public Source License
  10  * Version 2.0 (the 'License'). You may not use this file except in
  11  * compliance with the License. Please obtain a copy of the License at
  12  * http://www.opensource.apple.com/apsl/ and read it before using this
  13  * file.
  14  *
  15  * The Original Code and all software distributed under the License are
  16  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  17  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  18  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  20  * Please see the License for the specific language governing rights and
  21  * limitations under the License.
  22  *
  23  * @APPLE_LICENSE_HEADER_END@
  24  */
  25 /*
  26  * Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved
  27  */
  28 #import "sigcatch.h"
  29 #import <signal.h>
  30 #import <sys/signal.h>
  31 #import <ucontext.h>
  32
  33 /*
  34  * sigvec registers _sigtramp as the handler for any signal requiring
  35  * user-mode intervention.  All _sigtramp does is find the real handler,
  36  * calls it, then sigreturn's.
  37  *
  38  * Note that the kernel saves/restores all of our register state.
  39  */
  40 #if defined(__DYNAMIC__)
  41 int __in_sigtramp = 0;
  42 #endif
  43
  44 void
  45 _sigtramp(
  46         union __sigaction_u __sigaction_u,
  47         int                     sigstyle,
  48         int                     sig,
  49         siginfo_t               *sinfo,
  50         struct ucontext         *uctx
  51 ) {
  52
  53 #if defined(__DYNAMIC__)
  54         __in_sigtramp++;
  55 #endif
  56         if (sigstyle == 1)
  57                 sa_handler(sig);
  58 #ifdef __ppc__
  59         else
  60                 sa_sigaction(sig, sinfo, uctx);
  61 #endif /* __ppc__ */
  62
  63 #if defined(__DYNAMIC__)
  64         __in_sigtramp--;
  65 #endif
  66         sigreturn(uctx);
  67 }