On Jan 17 16:16, Christian Franke via Cygwin wrote: > mq_unlink() does not unlink anything and always returns -1 with errno = > EPERM. Yeah, that's a result of commit f2dc492df0f3. I guess checking for isdevfd_dev() is a bit over the top. Feel free to provide a patch, otherwise I'll look into it next week. Thanks, Corinna