AX_HAVE_POLL([ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND]) AX_HAVE_PPOLL([ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND])
This macro determines whether the system supports the poll I/O event interface. A neat usage example would be:
AX_HAVE_POLL(
[AX_CONFIG_FEATURE_ENABLE(poll)],
[AX_CONFIG_FEATURE_DISABLE(poll)])
AX_CONFIG_FEATURE(
[poll], [This platform supports poll(7)],
[HAVE_POLL], [This platform supports poll(7).])
Some systems – most notably Linux kernel 2.6.16 and later – also have the variant ppoll(). The availability of that function can be tested with the second macro. Generally speaking, it is safe to assume that AX_HAVE_POLL would succeed if AX_HAVE_PPOLL has, but not the other way round.
Download the latest version of ax_have_poll.m4 or browse the macro’s revision history.
Copyright © 2009 Peter Simons simons@cryp.to
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