mach/exc_catcher.c

   1 /*
   2  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. Please obtain a copy of the License at
  10  * http://www.opensource.apple.com/apsl/ and read it before using this
  11  * file.
  12  *
  13  * The Original Code and all software distributed under the License are
  14  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  15  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  16  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  18  * Please see the License for the specific language governing rights and
  19  * limitations under the License.
  20  *
  21  * @APPLE_LICENSE_HEADER_END@
  22  */
  23 /*
  24  * catch_exception_raise will be implemented by user programs
  25  * This implementation is provided to resolve the reference in
  26  * exc_server().
  27  */
  28
  29 #include <mach/boolean.h>
  30 #include <mach/message.h>
  31 #include <mach/exception.h>
  32 #include <mach/mig_errors.h>
  33 #include <mach-o/dyld.h>
  34 #include <stdlib.h>
  35
  36 __private_extern__ kern_return_t internal_catch_exception_raise (
  37     mach_port_t exception_port,
  38     mach_port_t thread,
  39     mach_port_t task,
  40     exception_type_t exception,
  41     exception_data_t code,
  42     mach_msg_type_number_t codeCnt)
  43 {
  44 #if defined(__DYNAMIC__)
  45     static int checkForFunction = 0;
  46     /* This will be non-zero if the user has defined this function */
  47     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);
  48     if (checkForFunction == 0) {
  49         checkForFunction = 1;
  50         _dyld_lookup_and_bind("_catch_exception_raise", (unsigned long *)&func, (void **)0);
  51     }
  52     if (func == 0) {
  53         /* The user hasn't defined catch_exception_raise in their binary */
  54         abort();
  55     }
  56     return (*func)(exception_port, thread, task, exception, code, codeCnt);
  57 #else
  58     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);
  59     return catch_exception_raise(exception_port, thread, task, exception, code, codeCnt);
  60 #endif
  61 }
  62