Poll

From PortaWiki

Some platforms don't have a poll(2) syscall (or equivalent library function), since it's not part of POSIX (it's a BSDism).

This is known to include:

• MacOS X 10.2
• QNX version 4
• Windows

If you need it and don't want to change to select(2) (which is in POSIX) then the compatibility library in OpenNTPD has a replacement built around select(2) that may be freely reused (2-term BSD and ISC license).

There are reports that even though MacOS X 10.0 and 10.1 had a poll(2), it was buggy. The number of these systems in production however is probably close to zero.

autoconf

You can check for HAVE_POLL

Windows

There is WSAPoll which can be used instead.