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