in reply to Re^3: how to kill background process when script exit?
in thread how to kill background process when script exit?

ikegami,

I agree that it makes no sense to use it there, I was trying stuff out of desparation :-). It was interesting however the results that it did have, even though not what I ultimately want.

It seems the consensus is that using open() to launch the app should run it in the background, but it just does not seem to be what I experience. My code (in the perl script) does not continue to execute until the child process has quit.

  • Comment on Re^4: how to kill background process when script exit?

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Re^5: how to kill background process when script exit?
by ikegami (Patriarch) on Feb 20, 2011 at 21:25 UTC
    Sorry, but you are mistaken. 
    $ perl -E'
   say "".localtime;
   open my $fh, q{perl -e sleep |};
   say "".localtime;
'
Sun Feb 20 13:25:05 2011
Sun Feb 20 13:25:05 2011
[hung waiting for child to exit]

    [download]

    or how about 

    $ perl -E'
   open my $fh, q{perl -E'\''sleep 1; say STDERR "C"'\'' |};
   say "P";
'
P
C

    [download]
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[d/l]
[select]
      interesting...I agree with you (see my last reply to Corion), but when I run your second script I get this (no fooling): 
      perl -e '
   open my $fh, q{perl -e '\''sleep 1; print STDERR "C"'\'' |};
   print "P";
'
CP

      [download]
      (I couldn't use 'say', you must have a later version of perl than I?)
[reply]
[d/l]

        say was introduced 4 years ago in 5.10.

        Buffering is delaying when you see the output.

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