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).

                                          19 March 1998                                  WLOCK(1)