NAME
rlock - run program with a lockfile
SYNOPSIS
rlock [options] lockfile program [args]
rlock [options] lockfile -- program options [args]
DESCRIPTION
rlock creates NFS safe lockfiles. it can optionally run a program
while holding the lock, ensuring lockfile removal on program exit. if
a program is specified to be run rlock will spawn a background thread
to kept the lockfile ’fresh’ by touching it at a regular interval. in
this way a lease is maintained on the lockfile and other processes
attempting to obtain the lock can determine that it is in use. see the
’--refresh’ option for how to control the touch interval. any other
process trying to obtain a lock will automatically remove a stale
lockfile; a stale lockfile is one that is older than a certain age.
this age be controled via the ’--max_age’ option.
ENVIRONMENT
LOCKFILE_DEBUG=1
causes internal actions of the library to be shown on STDERR.
DIAGNOSTICS
rlock attempts to exit with the status of ’program’ except where it
cannot due to exceptional conditions. in addition the message
RLOCK SUBCOMMAND FAILURE
will be printed on STDERR if ’program’ exits with non-zero status.
AUTHOR
lockfile was written by Ara T. Howard <ara.t.howard@noaa.gov>.
This manual page was converted by Decklin Foster <decklin@red-bean.com>
for the Debian project (but may be used by others).
2008-10-11