#

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# = open3.rb: Popen, but with stderr, too

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#

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# Author:: Yukihiro Matsumoto

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# Documentation:: Konrad Meyer

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#

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# Open3 gives you access to stdin, stdout, and stderr when running other

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# programs.

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#

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#

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# Open3 grants you access to stdin, stdout, and stderr when running another

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# program. Example:

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#

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# require "open3"

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# include Open3

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#

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# stdin, stdout, stderr = popen3('nroff -man')

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#

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# Open3.popen3 can also take a block which will receive stdin, stdout and

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# stderr as parameters. This ensures stdin, stdout and stderr are closed

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# once the block exits. Example:

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#

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# require "open3"

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#

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# Open3.popen3('nroff -man') { |stdin, stdout, stderr| ... }

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#

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module Open3

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#

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# Open stdin, stdout, and stderr streams and start external executable.

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# Non-block form:

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#

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# require 'open3'

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#

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# stdin, stdout, stderr = Open3.popen3(cmd)

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#

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# Block form:

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#

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# require 'open3'

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#

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# Open3.popen3(cmd) { |stdin, stdout, stderr| ... }

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#

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# The parameter +cmd+ is passed directly to Kernel#exec.

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#

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# _popen3_ is like _system_ in that you can pass extra parameters, and the

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# strings won't be mangled by shell expansion.

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#

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# stdin, stdout, stderr = Open3.popen3('identify', '/weird path/with spaces/and "strange" characters.jpg')

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# result = stdout.read

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#

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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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