On Thu, Nov 1, 2012 at 10:06 PM, Matthew Purdy <[email protected]> wrote:
> i have to fork a process and read a large amount of stdout; however, the
> child buffer gets filled up and everything hangs. how do you read
> stdout as stream?
>
> the only way i know how to do this is the following two ways; but both
> do not work; how can you get the stdout when the method starts so you
> can read stdout as it get written to from the child process?
>
>
You can use a thread:
$ ruby x.rb
1
2
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10
$ cat -n x.rb
1
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3 require 'open3'
4
5 Open3.popen3("seq", "1", "10") do |s_in, s_out, s_err, th|
6 # eat stderr
7 th_err = Thread.new { s = nil; while s_err.read(1024, s); end }
8
9 # copy stdout
10 s_out.each_line {|line| puts line}
11
12 # wait until finished
13 th_err.join
14 end
15
Kind regards
robert
--
remember.guy do |as, often| as.you_can - without end
http://blog.rubybestpractices.com/
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