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(int argc __unused, char **argv) {
  12     char *containingDirectory = realpath(dirname(argv[0]), NULL);
  13     testprintf("containingDirectory is %s\n", containingDirectory);
  14
  15     char *dyldLibraryPath = getenv("DYLD_LIBRARY_PATH");
  16     testprintf("DYLD_LIBRARY_PATH is %s\n", dyldLibraryPath);
  17
  18     if (dyldLibraryPath != NULL && strlen(dyldLibraryPath) > 0) {
  19         int foundMatch = 0;
  20         int foundNonMatch = 0;
  21
  22         dyldLibraryPath = strdup(dyldLibraryPath);
  23
  24         Dl_info info;
  25         int success = dladdr((void *)objc_msgSend, &info);
  26         testassert(success);
  27
  28         testprintf("libobjc is located at %s\n", info.dli_fname);
  29
  30         char *cursor = dyldLibraryPath;
  31         char *path;
  32         while ((path = strsep(&cursor, ":"))) {
  33             char *resolved = realpath(path, NULL);
  34             testprintf("Resolved %s to %s\n", path, resolved);
  35             if (strcmp(resolved, containingDirectory) == 0) {
  36                 testprintf("This is equal to our containing directory, ignoring.\n");
  37                 continue;
  38             }
  39             testprintf("Comparing %s and %s\n", resolved, info.dli_fname);
  40             int comparison = strncmp(resolved, info.dli_fname, strlen(resolved));
  41             free(resolved);
  42             if (comparison == 0) {
  43                 testprintf("Found a match!\n");
  44                 foundMatch = 1;
  45                 break;
  46             } else {
  47                 foundNonMatch = 1;
  48             }
  49         }
  50
  51         testprintf("Finished searching, foundMatch=%d foundNonMatch=%d\n", foundMatch, foundNonMatch);
  52         testassert(foundMatch || !foundNonMatch);
  53     }
  54     succeed(__FILE__);
  55 }