unit-tests/test-cases/dlclose-unload-c++/main.c

   1 /*
   2  * Copyright (c) 2005 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 #include <stdio.h>  // fprintf(), NULL
  24 #include <stdlib.h> // exit(), EXIT_SUCCESS
  25 #include <stdbool.h>
  26 #include <dlfcn.h>
  27
  28 #include "test.h" // PASS(), FAIL(), XPASS(), XFAIL()
  29
  30 ///
  31 /// This tests that if a C++ symbol (any weak symbol) is bound to an image
  32 /// that is dynamically unloaed, the image is not unloaded until all its clients are
  33 ///
  34
  35 typedef void* (*proc)(void);
  36
  37 bool inImage(void* x)
  38 {
  39   Dl_info info;
  40   return ( dladdr(x, &info) != 0 );
  41 }
  42
  43
  44 int main()
  45 {
  46         void* handle1 = dlopen("libfoo.dylib", RTLD_LAZY);
  47         if ( handle1 == NULL ) {
  48                 FAIL("dlclose-unload-c++: dlopen(\"libfoo.dylib\", RTLD_LAZY) failed with dlerror()=%s", dlerror());
  49                 exit(0);
  50         }
  51
  52         proc fooProc = (proc)dlsym(handle1, "foo");
  53         if ( fooProc == NULL ) {
  54                 FAIL("dlclose-unload-c++: dlsym(handle1, \"foo\") failed");
  55                 exit(0);
  56         }
  57
  58         void* handle2 = dlopen("libbar.dylib", RTLD_LAZY);
  59         if ( handle2 == NULL ) {
  60                 FAIL("dlclose-unload-c++: dlopen(\"libfoo.dylib\", RTLD_LAZY) failed with dlerror()=%s", dlerror());
  61                 exit(0);
  62         }
  63
  64         proc barProc = (proc)dlsym(handle2, "bar");
  65         if ( barProc == NULL ) {
  66                 FAIL("dlclose-unload-c++: dlsym(handle2, \"bar\") failed");
  67                 exit(0);
  68         }
  69
  70         // verify that uniquing is happening
  71         void* fooResult = (*fooProc)();
  72         void* barResult = (*barProc)();
  73         if ( fooResult != barResult ) {
  74                 FAIL("dlclose-unload-c++: foo() and bar() returned different values");
  75                 exit(0);
  76         }
  77
  78         // close libfoo, even though libbar is using libfoo
  79         dlclose(handle1);
  80
  81         // error if libfoo was unloaded
  82         if ( !inImage(fooProc) ) {
  83                 FAIL("dlclose-unload-c++: libfoo should not have been unloaded");
  84                 exit(0);
  85         }
  86
  87         // close libbar which should release libfoo
  88         dlclose(handle2);
  89
  90         // error if libfoo was not unloaded
  91         if ( inImage(fooProc) ) {
  92                 FAIL("dlclose-unload-c++: libfoo should have been unloaded");
  93                 exit(0);
  94         }
  95
  96         PASS("dlclose-unload-c++");
  97         return EXIT_SUCCESS;
  98 }