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* 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.