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