Re: pipe to a pubprocess, or tmpfile
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- Subject: Re: pipe to a pubprocess, or tmpfile
- From: pj@...
- Date: Tue, 7 Sep 2010 21:41:54 +1000
OK, one more on the subject:
> > Problem is, popen
> > doesn't give you the return value of the command you ran.
> The good news is that closing the handle from io.popen in
> Lua 5.2 does give you the return code.
That it means p:close waits for the command to finish:
local p = assert(io.popen('aplaymidi -', 'w'))
p:write(my_midi) -- fast; the MIDI is compact :-)
p:close() -- waits several minutes :-(
Is there a way of letting aplaymidi run on in the background?
p = io.popen('aplaymidi - &', 'w')
p:write(my_midi)
fails with
- is not a Standard MIDI File (it's empty :-( )
and I get the same message from:
io.popen('sh -c "aplaymidi -" &', 'w')
p:write(my_midi)
and likewise at the command-line:
cat t.mid | sh -c 'aplaymidi - &'
Although at the command-line:
cat t.mid | sh -c "aplaymidi -" &
works as intended, so by now I'm starting to get confused...
Is there a right way to background the aplaymidi process ?
Regards, Peter Billam
http://www.pjb.com.au pj@pjb.com.au (03) 6278 9410
"Was der Meister nicht kann, vermöcht es der Knabe, hätt er
ihm immer gehorcht?" Siegfried to Mime, from Act 1 Scene 2