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to find the most recent reboot.

(lock_file): Encode the file name, to make lock file name.

defined.

(lock_file_1): Add boot-time to lock only if available.

the uptime, assume the lock is from this system boot.

(get_boot_time): New function.
(lock_file_1): Include boot time in the lock text.
(current_lock_owner): Parse and compare the boot time.

do the work directly, and avoid calling Fexpand_file_name.

the variable named pid is unsigned long.

if this or another existing process owns it!

Fsystem_name don't return strings.
(current_lock_owner): Likewise.

(lock_file_1): Use LOCK_PID_MAX when allocating lock_info_str
instead of hardwiring 21.

(lock_file_1): Use %lu instead of %d in printf.

locked for 20 seconds.

(Funlock_buffer): Use buffer's file_truename, not filename.

instead of direct access to the save_modiff field.

Renamed from lock_path, superlock_path, MAKE_LOCK_PATH.