wlock(1)

Tests or sets a file with POSIX-fcntl() write-locks

Section 1 sendfile bookworm source

Description

WLOCK

NAME

wlock - Tests or sets a file with POSIX-fcntl() write-locks

SYNOPSIS

wlock [ -s [-a seconds ]] [ -t] [ -v] [ -b begin ] [ -l length ] file
or
wlock [ -s ] [ -v] [ -b begin ] [ -l length ] file program [ arguments ]

DESCRIPTION

This program sets or tests advisory locks conforming to POSIX fcntl() call. You may specify optionaly a program to start it within the lock context.

OPTIONS

These options are accepted. If a program is provided as argument wlock will start it.

	-s		Sets the lock.
	-t		Test the lock (default).
	-v		Verbose output.

-b begin

The lock starts at byte #begin.

-l length

The lock will be length bytes long.

-a seconds

The lock is active for seconds (default=86400).

RETURN VALUES

	0		In test mode this means that the file is locked. In set mode it indicates the succesful creation of the lockfile
	1		The file is not locked. Only available in testmode.
	2		Some error has occurred.

AUTHOR

wlock has been written by Ulli Horlacher (framstag@belwue.de>.