testing/test-cases/dlsym-RTLD_NEXT.dtest/main.c

   1
   2 // BUILD:  $CC foo.c -dynamiclib  -install_name $RUN_DIR/libfoo-static.dylib  -o $BUILD_DIR/libfoo-static.dylib
   3 // BUILD:  $CC foo.c -dynamiclib  -install_name $RUN_DIR/libfoo-dynamic.dylib -o $BUILD_DIR/libfoo-dynamic.dylib -DDYN
   4 // BUILD:  $CC main.c $BUILD_DIR/libfoo-static.dylib -o $BUILD_DIR/dlsym-RTLD_NEXT.exe -DRUN_DIR="$RUN_DIR"
   5
   6 // RUN:  ./dlsym-RTLD_NEXT.exe
   7
   8 #include <stdio.h>
   9 #include <dlfcn.h>
  10 #include <string.h>
  11 #include <mach-o/dyld_priv.h>
  12
  13
  14 // verify RTLD_NEXT search order
  15
  16 int mainSymbol = 4;
  17
  18
  19 // my local implemention of free
  20 void free(void* p) { }
  21
  22
  23 static bool symbolInImage(const char* symName, const char* image)
  24 {
  25     void* sym = dlsym(RTLD_NEXT, symName);
  26     if ( sym == NULL )
  27         return false;
  28     const char* imagePath = dyld_image_path_containing_address(sym);
  29     if ( imagePath == NULL )
  30         return false;
  31     return (strstr(imagePath, image) != NULL);
  32 }
  33
  34
  35
  36
  37 int main()
  38 {
  39     printf("[BEGIN] dlsym-RTLD_NEXT\n");
  40
  41     // verify mainSymbol is not found
  42     if ( dlsym(RTLD_NEXT, "mainSymbol") != NULL ) {
  43         printf("[FAIL]  dlsym-RTLD_NEXT: mainSymbol should not have been found\n");
  44         return 0;
  45     }
  46
  47     // verify free is found in OS (not local one)
  48     if ( !symbolInImage("free", "/usr/lib/") ) {
  49         printf("[FAIL]  dlsym-RTLD_NEXT: free\n");
  50         return 0;
  51     }
  52
  53     // verify foo is found in libfoo-static.dylib
  54     if ( !symbolInImage("foo", "libfoo-static.dylib") ) {
  55         printf("[FAIL]  dlsym-RTLD_NEXT: foo not in libfoo-static.dylib\n");
  56         return 0;
  57     }
  58
  59     void* handle = dlopen(RUN_DIR "/libfoo-dynamic.dylib", RTLD_LAZY);
  60     if ( handle == NULL ) {
  61         printf("[FAIL]  dlsym-RTLD_NEXT: libfoo-dynamic.dylib could not be loaded\n");
  62         return 0;
  63     }
  64
  65     // verify foo is still found in statically linked lib
  66     if ( !symbolInImage("foo", "libfoo-static.dylib") ) {
  67         printf("[FAIL]  dlsym-RTLD_NEXT: foo not in libfoo-static.dylib\n");
  68         return 0;
  69     }
  70
  71     // verify foo2 is not found in libfoo-dynamic.dylib", because RTLD_NEXT only searches thing this image would have seen
  72     if ( symbolInImage("foo2", "libfoo-dynamic.dylib") ) {
  73         printf("[FAIL]  dlsym-RTLD_NEXT: foo2 found but should not have been\n");
  74         return 0;
  75     }
  76
  77     printf("[PASS]  dlsym-RTLD_NEXT\n");
  78         return 0;
  79 }
  80