Re: [pacman-dev] Improving locking - Was: [PATCH] Use file locks (flock) to stop multiple pacman instances from running concurrently. This improves the current model by automatically removing locks held by programs has failed to remove the lock, for example at a crash, forced kill or power outage.

On Mon, Aug 19, 2013 at 5:39 AM, Allan McRae <allan@archlinux.org> wrote:

I stored the process ID in the lock file during creation many years ago. Is there a portable way for us to determine if that process ID is still running and remove the lock file automatically if it is not?

Try to kill the PID with signal 0 and remove it if it fails with ESRCH?