mach/exc_catcher.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  * catch_exception_raise will be implemented by user programs
  27  * This implementation is provided to resolve the reference in
  28  * exc_server().
  29  */
  30
  31 #include <mach/boolean.h>
  32 #include <mach/message.h>
  33 #include <mach/exception.h>
  34 #include <mach/mig_errors.h>
  35 #include <mach-o/dyld.h>
  36
  37 __private_extern__ kern_return_t internal_catch_exception_raise (
  38     mach_port_t exception_port,
  39     mach_port_t thread,
  40     mach_port_t task,
  41     exception_type_t exception,
  42     exception_data_t code,
  43     mach_msg_type_number_t codeCnt)
  44 {
  45 #if defined(__DYNAMIC__)
  46     static int checkForFunction = 0;
  47     /* This will be non-zero if the user has defined this function */
  48     static kern_return_t (*func)(mach_port_t, mach_port_t, mach_port_t, exception_type_t, exception_data_t, mach_msg_type_number_t);
  49     if (checkForFunction == 0) {
  50         checkForFunction = 1;
  51         _dyld_lookup_and_bind("_catch_exception_raise", (unsigned long *)&func, (void **)0);
  52     }
  53     if (func == 0) {
  54         /* The user hasn't defined catch_exception_raise in their binary */
  55         abort();
  56     }
  57     return (*func)(exception_port, thread, task, exception, code, codeCnt);
  58 #else
  59     extern kern_return_t catch_exception_raise(mach_port_t, mach_port_t, mach_port_t, exception_type_t, exception_data_t, mach_msg_type_number_t);
  60     return catch_exception_raise(exception_port, thread, task, exception, code, codeCnt);
  61 #endif
  62 }
  63