[xmonad] how to redirect dynamicLogXinerama output to a FIFO/named pipe?

Brandon Allbery allbery.b at gmail.com
Wed Jun 20 04:33:36 CEST 2012

On Tue, Jun 19, 2012 at 9:57 PM, Lara Michaels
<laramichaels1978 at yahoo.com>wrote:

> but to my surprise running 'tail -f /tmp/xmonad-fifo' shows no output,
> while if I simply start xmonad in a terminal I can see it printing
> information about the workspaces being used to the terminal:

At a guess, you've just demonstrated that nobody has been using
dynamicLogXinerama.  It isn't flushing its output, and I can't find
anywhere where xmonad sets its stdout to unbuffered or line buffered
output.  Output to a terminal is automatically line buffered, so in that
case it works as expected; block buffering means it'd only get flushed to
the FIFO every 4Kbytes or so.

You could try importing System.IO and adding

    hSetBuffering stdout LineBuffering

to the startupHook.

brandon s allbery                                      allbery.b at gmail.com
wandering unix systems administrator (available)     (412) 475-9364 vm/sms
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