Question

I’m using the following code to open a named pipe located at ‘/tmp/xyz’ for read only access:

#!/usr/bin/perl
use strict;
use Fcntl;
...
sysopen(FIFO, "/tmp/xyz", O_RDONLY) or die ("opening named pipe failed: $!\n");
...

The problem is, that sysopen hangs upon calling. It neither ‘dies’ nor code after the call is executed.

output of ls -la /tmp/xyz:

prw-r--r-- 1 user group 0 Jun 20 11:45 /tmp/xyz

Anybody got an idea, what’s happening? Thanks in advance!

Answer 1

You opened it in blocking mode, program will not continue until someone writes into the FIFO.

You probably want to open it non-blocking:

O_RDONLY | O_NONBLOCK