Function test

test/stat/test_chmod.c:45–179

}

void test() {
  int err;
  time_t lastctime;
  time_t lastmtime;
  struct stat s;

  //
  // chmod()ing a file should change metadata modification time (ctime),
  // but not the file modification time (mtime)
  //
  // get the current ctime for the file
  memset(&s, 0, sizeof s);
  stat("file", &s);
  lastctime = s.st_ctime;
  lastmtime = s.st_mtime;
  sleep(1);

  // do the actual chmod
  err = chmod("file", S_IWUSR);
  assert(!err);

  memset(&s, 0, sizeof s);
  stat("file", &s);
  assert(s.st_mode == (S_IWUSR | S_IFREG));
  assert(s.st_ctime != lastctime);
  assert(s.st_mtime == lastmtime);

  //
  // fchmod()ing a file should change metadata modification time,
  // but not the file modification time
  //
  lastctime = s.st_ctime;
  lastmtime = s.st_mtime;
  sleep(1);

  err = fchmod(open("file", O_WRONLY), S_IXUSR);
  assert(!err);

  memset(&s, 0, sizeof s);
  stat("file", &s);
  assert(s.st_mode == (S_IXUSR | S_IFREG));
  assert(s.st_ctime != lastctime);
  assert(s.st_mtime == lastmtime);

  //
  // fchmodat()ing a file should also only change metadata modification time,
  // but not the file modification time.
  //
  memset(&s, 0, sizeof s);
  stat("otherfile", &s);
  lastctime = s.st_ctime;
  lastmtime = s.st_mtime;
  sleep(1);
  err = fchmodat(AT_FDCWD, "otherfile", S_IXUSR, 0);
  assert(!err);

  assert(symlink("otherfile", "link") == 0);
  err = fchmodat(AT_FDCWD, "link", S_IXGRP, AT_SYMLINK_NOFOLLOW);