зеркало из https://github.com/github/ruby.git
102 строки
1.8 KiB
Ruby
102 строки
1.8 KiB
Ruby
#
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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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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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