This is a very simple EPICS support module for ensuring that an IOC is not started twice. For this purpose it introduces an new IOC shell command that tries to acquire a lock on a file and fails if another process already holds that lock.

Add the dependency to this device support to configure/RELEASE. For example:

IOC_LOCK = /opt/epics/modules/iocLock

Add a reference to the support's .dbd file and library to the IOC's Makefile. For example, in xxxApp/src/Makefile, add the following two lines:

xxx_DBD += iocLock.dbd
xxx_LIBS += iocLock

Finally, add the command for acquiring the lock file to st.cmd. For example:

iocLockFile("$(TOP)/iocBoot/$(IOC)/ioc.lock")

This EPICS support is licensed under the terms of the GNU Lesser General Public License version 3. It has been developed by aquenos GmbH on behalf of the Karlsruhe Institute of Technology's Institute of Beam Physics and Technology.