Sorted this out once I understood exec better:
pid = fork
if (pid == nil)
# child
exec(cmd)
else
# parent
Signal.trap("SIGINT") do
Process.kill(9,pid) # kill child
puts "Removing #{outfile}..."
FileUtils.rm(outfile)
Process.kill(9,0) # kill self
end
begin
Process.waitpid(pid)
rescue
puts "Whateeever..."
end
end
Any comments on this? The right way to do things?
Sonia Hamilton wrote:
(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
--
You received this message because you are subscribed to the Google Groups "Ruby or
Rails Oceania" group.
To post to this group, send email to [email protected].
To unsubscribe from this group, send email to
[email protected].
For more options, visit this group at
http://groups.google.com/group/rails-oceania?hl=en.
