(Ruby 1.9)
In a script, I would like to repeatedly start up a long running
subprocess, but only have one subprocess running at a time. If I send my
script an interrupt (ctrl-c), I'd like to kill the subprocess, clean up
some files, and exit my script. I've been playing with fork, wait, exec,
spawn, threads and trap - not getting very far...
I guess my real source of confusion is when I send through the ctrl-c,
is it first caught by my script or the subprocess?
How do I do this? Anyone have some sample code?
This is how I thought I'd do it, but when I ctrl-c the output just
flashes and the script keeps running :-(
pid = spawn(cmd)
Signal.trap(2) do # SIGINT, ctrl-c
puts "Removing #{outfile}..."
FileUtils.rm(outfile)
Process.kill(9,pid) # kill subprocess
Process.kill(9,0) # kill self
end
waitpid(pid, Process::WNOHANG) # only have one subprocess at a time
The commands (cmd) look like this (high cpu video processing, so I only
want 1 running at once):
handbrake -i foo/VIDEO_TS --preset='Normal' --longest --chapters 7
--output mp4/foo.7.mp4
--
Sonia Hamilton.
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