* Makefile.in (DLL_OFILES): Add fhandler_mailslot.o.

	* Makefile.in (DLL_OFILES): Add fhandler_mailslot.o.
	* devices.h (FH_KMSG): Define new device.
	* devices.in: Add "/dev/kmsg" entry.
	* devices.cc: Regenerate.
	* dtable.cc (build_fh_pc): Handle case FH_KMSG.
	* fhandler.h (class fhandler_mailslot): New class.
	(class select_stuff): Add device_specific_mailslot pointer.
	* fhandler_mailslot.cc: New file.
	* select.cc (peek_mailslot): New function.
	(verify_mailslot): Ditto.
	(struct mailslotinf): New stuct to handle select on mailslots.
	(thread_mailslot): New function.
	(start_thread_mailslot): Ditto.
	(mailslot_cleanup): Ditto.
	(fhandler_mailslot::select_read): New method.
	* syslog.cc (klog_guard): New muto.
	(dev_kmsg): Local mailslot for kernel message device.
	(vklog): New function.
	(klog): Ditto.
	* winsup.h (vklog): Declare.
	(klog): Ditto.
	* include/sys/syslog.h: Define _PATH_KLOG.