libsyscall/mach/exc_catcher.c

   1 /*
   2  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_OSREFERENCE_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. The rights granted to you under the License
  10  * may not be used to create, or enable the creation or redistribution of,
  11  * unlawful or unlicensed copies of an Apple operating system, or to
  12  * circumvent, violate, or enable the circumvention or violation of, any
  13  * terms of an Apple operating system software license agreement.
  14  *
  15  * Please obtain a copy of the License at
  16  * http://www.opensource.apple.com/apsl/ and read it before using this file.
  17  *
  18  * The Original Code and all software distributed under the License are
  19  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  20  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  21  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  22  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  23  * Please see the License for the specific language governing rights and
  24  * limitations under the License.
  25  *
  26  * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  27  */
  28 /*
  29  * catch_exception_raise will be implemented by user programs
  30  * This implementation is provided to resolve the reference in
  31  * exc_server().
  32  */
  33
  34 #include <mach/boolean.h>
  35 #include <mach/message.h>
  36 #include <mach/exception.h>
  37 #include <mach/mig_errors.h>
  38 #include <dlfcn.h>
  39 #include <stdlib.h>
  40
  41 __private_extern__ kern_return_t internal_catch_exception_raise (
  42     mach_port_t exception_port,
  43     mach_port_t thread,
  44     mach_port_t task,
  45     exception_type_t exception,
  46     exception_data_t code,
  47     mach_msg_type_number_t codeCnt)
  48 {
  49 #if defined(__DYNAMIC__)
  50     static int checkForFunction = 0;
  51     /* This will be non-zero if the user has defined this function */
  52     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);
  53     if (checkForFunction == 0) {
  54         checkForFunction = 1;
  55                 func = dlsym(RTLD_DEFAULT, "catch_exception_raise");
  56     }
  57     if (func == 0) {
  58         /* The user hasn't defined catch_exception_raise in their binary */
  59         abort();
  60     }
  61     return (*func)(exception_port, thread, task, exception, code, codeCnt);
  62 #else
  63     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);
  64     return catch_exception_raise(exception_port, thread, task, exception, code, codeCnt);
  65 #endif
  66 }
  67