[PD] read Linux fifos / named pipes

[Carlos Franke]

> > way to read from a named pipe /
> > fifo in Linux? 
[…]
> anyhow, zexy also has [freadln] and [fwriteln] which should work ok.

Both make Pd freeze when trying to [open( a fifo. Steps to reproduce:

1. In terminal: mkfifo /tmp/testfifo

2. In Pd:

[open /tmp/testfifo cr(  //comment: same without "cr"
|
[freadln]

3. click message

result:
 - Pd unresponsive
 - Only repeated "watchdog: signaling pd..." from the command that
   opened Pd. (-verbose doesn't give any more.)

c
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