Ceph

```

if (::ftruncate(pf_fd, 0) < 0) {
int err = errno;
derr << func << ": failed to ftruncate the pid file '"
<< pf_path << "': " << cpp_strerror(err) << dendl;
return err;
}

```

See above, we shall negative the error returning, as we usually do, otherwise global callers such as global_init_prefork() won't catch postive error codes:

```

if (pidfile_write(conf) < 0)
      exit(1);

```