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I am currently working on a linux daemon that needs to be single instance (i.e restricted to 1 user 1 process). What would be the best way of doing so without having to use getpid() to manually write the pid out to /var/run/ and then lock it using flock()?
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A Pid-File is a file containing the process identification number (pid) that is stored in a well-defined location of the filesystem thus allowing other programs to find out the pid of a running script.
The easiest way to find out if process is running is run ps aux command and grep process name. If you got output along with process name/pid, your process is running.
Wrap the start-up and shut-down with start-stop-daemon.
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