Module: Ndo

Defined in:
lib/ndo.rb,
lib/ndo/popen.rb

Defined Under Namespace

Classes: Host, MultiHost, Pipe, Process, Result

Class Method Summary collapse

Class Method Details

.popen(*cmd) ⇒ Object

NOTE: This was using the Open4 gem previously. That method turned out to not be portable across rubies and operating systems, that’s why we try our luck with maintaining this popen4 here.



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# File 'lib/ndo/popen.rb', line 26

def popen(*cmd)
  c_in, c_out, c_err = 3.times.map { Pipe.new(*IO.pipe) }

  pid = fork do
    c_in.write.close
    STDIN.reopen(c_in.read)
    c_in.read.close
    
    c_out.read.close
    STDOUT.reopen(c_out.write)
    c_out.write.close
    
    c_err.read.close
    STDERR.reopen(c_err.write)
    c_err.write.close
    
    exec(*cmd)
    fail "NOT REACHED: EXEC FAILED"
  end

  c_in.read.close
  c_out.write.close
  c_err.write.close
  
  # c_in.sync = true
  Process.new(pid, c_in.write, c_out.read, c_err.read)
end