It's used to specify the handles to monitor for exceptional conditions.
If you need it, you'd know it.
Perl's select is a thin wrapper for the system call of the same name.
From my select(2) man page:
The file descriptors in exceptfds will be watched for exceptional conditions. (For examples of some exceptional conditions, see the
discussion of POLLPRI in poll(2).)
From my poll(2) man page:
- POLLPRI
There is some exceptional condition on the file descriptor. Possibilities include:
- There is out-of-band data on a TCP socket (see tcp(7)).
- A pseudoterminal master in packet mode has seen a state change on the slave (see ioctl_tty(2)).
- A cgroup.events file has been modified (see cgroups(7)).
By the way, IO::Select presents a much better interface.
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