test/libraryPath.c

   1 // TEST_CFLAGS -lobjc
   2
   3 #include "test.h"
   4 #include <dlfcn.h>
   5
   6 // We use DYLD_LIBRARY_PATH to run the tests against a particular copy of
   7 // libobjc. If this fails somehow (path is wrong, codesigning prevents loading,
   8 // etc.) then the typical result is a silent failure and we end up testing
   9 // /usr/lib/libobjc.A.dylib instead. This test detects when DYLD_LIBRARY_PATH is
  10 // set but libobjc isn't loaded from it.
  11 int main() {
  12     char *dyldLibraryPath = getenv("DYLD_LIBRARY_PATH");
  13     testprintf("DYLD_LIBRARY_PATH is %s\n", dyldLibraryPath);
  14     if (dyldLibraryPath != NULL && strlen(dyldLibraryPath) > 0) {
  15         int foundMatch = 0;
  16
  17         dyldLibraryPath = strdup(dyldLibraryPath);
  18
  19         Dl_info info;
  20         int success = dladdr((void *)objc_msgSend, &info);
  21         testassert(success);
  22
  23         testprintf("libobjc is located at %s\n", info.dli_fname);
  24
  25         char *cursor = dyldLibraryPath;
  26         char *path;
  27         while ((path = strsep(&cursor, ":"))) {
  28             char *resolved = realpath(path, NULL);
  29             testprintf("Resolved %s to %s\n", path, resolved);
  30             testprintf("Comparing %s and %s\n", resolved, info.dli_fname);
  31             int comparison = strncmp(resolved, info.dli_fname, strlen(resolved));
  32             free(resolved);
  33             if (comparison == 0) {
  34                 testprintf("Found a match!\n");
  35                 foundMatch = 1;
  36                 break;
  37             }
  38         }
  39
  40         testprintf("Finished searching, foundMatch=%d\n", foundMatch);
  41         testassert(foundMatch);
  42     }
  43     succeed(__FILE__);
  44 }