From: Joe Wreschnig <piman@...>
Date: 2002-07-14T13:28:51+09:00
Subject: Re: new to ruby,how to make FIFO in ruby?


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Augh! I accidentally bumped send before I was done:

class File
  def self.mkfifo(name, mode=3D"0600", open_mode=3D"rw")
    if ! File.writeable? File.dirname(name)
      raise Errno::EACCES, "No such directory"
    end

    if File.exists? name and File.pipe? name # Leftover from before
      File.delete name
    end

    if ! File.exists? name
      system("mkfifo", "--mode=3D" + mode, name)
      @@created_fifos << name
    end

    return File.open(name, open_mode)
  end

  def self.delete_fifos
    @@created_fifos.each { |fifo| File.delete fifo }
  end
end

This code doesn't work perfectly (if the file exists and is *not* a
FIFO, it will just open the file normally, which was intended behavior
for my program, but probably not for yours). And the File.delete_fifos
code is probably not mandatory, but usually programs want to clean up
their FIFOs when they exist. Also, you might not want it to return the
file, in case you want to do your own stuff to make it non-blocking,
etc.
--=20
 - Joe Wreschnig <piman@sacredchao.net>  -  http://www.sacredchao.net
  "What I did was justified because I had a policy of my own... It's
   okay to be different, to not conform to society."
                                   -- Chen Kenichi, Iron Chef Chinese

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