Checking if the other end of a fifo is open

[Dave Smith]

Dave Smith wrote:
> Okay, got it. This sandbox script simulates a blocking call (sleeping 
> for 2 seconds in this case) in a backgrounded subshell, which signals 
> when it's done. Thanks Nicholas! 


Oh crap. This won't work because the subshell needs to open a file 
descriptor that my parent shell wants to read from. This method works 
great for getting around the blocking issue, but now I need to actually 
read from the  FD opened in the subshell (which gets closed when the 
subshell exits).

--Dave