mach.subproj/exc_catcher.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  * catch_exception_raise will be implemented by user programs
  24  * This implementation is provided to resolve the reference in
  25  * exc_server().
  26  */
  27
  28 #include <mach/boolean.h>
  29 #include <mach/message.h>
  30 #include <mach/exception.h>
  31 #include <mach/mig_errors.h>
  32 #include <mach-o/dyld.h>
  33
  34 __private_extern__ kern_return_t internal_catch_exception_raise (
  35     mach_port_t exception_port,
  36     mach_port_t thread,
  37     mach_port_t task,
  38     exception_type_t exception,
  39     exception_data_t code,
  40     mach_msg_type_number_t codeCnt)
  41 {
  42 #if defined(__DYNAMIC__)
  43     static int checkForFunction = 0;
  44     /* This will be non-zero if the user has defined this function */
  45     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);
  46     if (checkForFunction == 0) {
  47         checkForFunction = 1;
  48         _dyld_lookup_and_bind("_catch_exception_raise", (unsigned long *)&func, (void **)0);
  49     }
  50     if (func == 0) {
  51         /* The user hasn't defined catch_exception_raise in their binary */
  52         abort();
  53     }
  54     return (*func)(exception_port, thread, task, exception, code, codeCnt);
  55 #else
  56     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);
  57     return catch_exception_raise(exception_port, thread, task, exception, code, codeCnt);
  58 #endif
  59 }
  60