зеркало из https://github.com/github/ruby.git
78 строки
1.5 KiB
Ruby
78 строки
1.5 KiB
Ruby
# open3.rb: Spawn a program like popen, but with stderr, too. You might also
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# want to use this if you want to bypass the shell. (By passing multiple args,
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# which IO#popen does not allow)
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#
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# Usage:
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# require "open3"
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#
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# stdin, stdout, stderr = Open3.popen3('nroff -man')
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# or
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# include Open3
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# stdin, stdout, stderr = popen3('nroff -man')
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#
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# popen3 can also take a block which will receive stdin, stdout and stderr
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# as parameters. This ensures stdin, stdout and stderr are closed once
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# the block exits.
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#
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# Such as
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# Open3.popen3('nroff -man') { |stdin, stdout, stderr| ... }
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module Open3
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#[stdin, stdout, stderr] = popen3(command);
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def popen3(*cmd)
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pw = IO::pipe # pipe[0] for read, pipe[1] for write
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pr = IO::pipe
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pe = IO::pipe
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pid = fork{
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# child
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fork{
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# grandchild
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pw[1].close
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STDIN.reopen(pw[0])
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pw[0].close
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pr[0].close
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STDOUT.reopen(pr[1])
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pr[1].close
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pe[0].close
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STDERR.reopen(pe[1])
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pe[1].close
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exec(*cmd)
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}
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exit!(0)
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}
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pw[0].close
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pr[1].close
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pe[1].close
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Process.waitpid(pid)
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pi = [pw[1], pr[0], pe[0]]
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pw[1].sync = true
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if defined? yield
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begin
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return yield(*pi)
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ensure
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pi.each{|p| p.close unless p.closed?}
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end
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end
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pi
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end
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module_function :popen3
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end
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if $0 == __FILE__
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a = Open3.popen3("nroff -man")
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Thread.start do
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while line = gets
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a[0].print line
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end
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a[0].close
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end
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while line = a[1].gets
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print ":", line
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end
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end
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