Next: , Previous: , Up: The Macros  


ax_have_poll

Synopsis

   AX_HAVE_POLL([ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND])
AX_HAVE_PPOLL([ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND])

Description

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.

Source Code

Download the latest version of ax_have_poll.m4 or browse the macro’s revision history.

License

Copyright © 2009 Peter Simons simons@cryp.to

Copying and distribution of this file, with or without modification, are permitted in any medium without royalty provided the copyright notice and this notice are preserved. This file is offered as-is, without any warranty.