unit-tests/test-cases/interpose-dynamic-basic/main.c

   1 /*
   2  * Copyright (c) 2014 Apple 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 #include <stdio.h>  // fprintf(), NULL
  24 #include <stdlib.h> // exit(), EXIT_SUCCESS
  25 #include <string.h>
  26 #include <dlfcn.h>
  27 #include <mach-o/dyld_priv.h>
  28
  29 extern const struct mach_header __dso_handle;
  30
  31
  32 #include "test.h" // PASS(), FAIL(), XPASS(), XFAIL()
  33
  34 typedef char* (*DupProc)(const char*);
  35
  36 char* mystrdup(const char* in)
  37 {
  38         return "hello";
  39 }
  40
  41 static const struct dyld_interpose_tuple sTable[] = { {&mystrdup, &strdup} };
  42
  43 int main()
  44 {
  45         const char* preCall = strdup("123");
  46   DupProc preProc = &strdup;
  47
  48   dyld_dynamic_interpose(&__dso_handle, sTable, 1);
  49
  50         const char* postCall = strdup("123");
  51   DupProc postProc = &strdup;
  52
  53   if ( strcmp(preCall, "123") != 0 ) {
  54       FAIL("interpose-dynamic-basic control strdup failed");
  55       return EXIT_SUCCESS;
  56   }
  57
  58   if ( strcmp(postCall, "hello") != 0 ) {
  59       FAIL("interpose-dynamic-basic interposed lazy strdup failed");
  60       return EXIT_SUCCESS;
  61   }
  62
  63   if ( preProc == postProc ) {
  64       FAIL("interpose-dynamic-basic interposed non-lazy strdup failed");
  65       return EXIT_SUCCESS;
  66   }
  67
  68   PASS("interpose-dynamic-basic");
  69
  70         return EXIT_SUCCESS;
  71 }