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>.

SEE ALSO¶

sendfile(1).