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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 communication.

  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 system_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 disconnects
  unexpectedly). This situation has been accounted for and the commands 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
  /usr/lib/uucp
	    Contains the uucico daemon and uugetty program.

  /usr/bin  Contains the uucp, cu, and tip programs.

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

  Daemons: uucico(8)

Index for Section 4

Alphabetical listing for L

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