locks man page on DigitalUNIX

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locks(4)							      locks(4)

NAME
       locks  - A directory that contains lock files for communication devices
       and remote systems that prevent	multiple  attempts  to	use  the  same
       device or contact a remote system

SYNOPSIS
       /var/spool/locks

DESCRIPTION
       Lock  files  are	 created by the uucico daemon, the cu command, the tip
       command, and the uugetty command in the /var/spool/locks directory. The
       files are created when the utility opens the serial line for communica‐
       tion.

       The lock file locks the device or remote system so that another process
       cannot  access  it  while  it is in use. The file name of the lock file
       uses one of  the	 following  forms:  LCK..device_name  LCK..system_name
       Where  device_name  is  the name of the device (such as ttyd0) and sys‐
       tem_name is the name of the system (such as hera).

       Normally, the process that creates a lock file will remove it when  the
       process	has  finished using the line. However, it is possible for lock
       files to be left behind (for example: system crash, phone line  discon‐
       nects unexpectedly). This situation has been accounted for and the com‐
       mands that use lock files can handle the situation and overwrite	 these
       files, if appropriate.

       Lock  files  contains  the process ID (PID) of the process that created
       the lock.  The lock file is a data file; to see its contents,  use  the
       following command:
	od -d lockfile

       Where  lockfile	is  the	 name  of  the	file.  For  example:  %	 od -d
       /var/spool/locks/LCK..ttyd0 0000000  06854 00000 0000004

       In this example, the lock file (LCK..ttyd0) was created by the  process
       with PID 6854.

FILES
       Contains the uucico daemon and uugetty program.	Contains the uucp, cu,
       and tip programs.

RELATED INFORMATION
       Commands: cu(1), od(1), tip(1), uucp(1), uugetty(8)

       Daemons: uucico(8) delim off

								      locks(4)
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