redhat linux 2.4.7 mkfifo pipe always 0 length

[KAWANISHI,DOREEN (HP-Roseville,ex1)]

Is there some kind of flag/switch/program I need to set/run
to get named pipes to be able to read input?  This sample
program was working.  I rebooted the machine, now the program
doesn't work.  It always says the pipe is 0 length even after
I feed it input.

Example:

cc -ansi dk.c -o dk
dk foo

On a separate console:

echo "hi" > foo

dk.c
Description: Binary data