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# ===========================================================================
# https://www.gnu.org/software/autoconf-archive/ax_have_poll.html
# ===========================================================================
#
# 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.
#
# LICENSE
#
# Copyright (c) 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.
#serial 8
AC_DEFUN([AX_HAVE_POLL], [dnl
AC_MSG_CHECKING([for poll(2)])
AC_CACHE_VAL([ax_cv_have_poll], [dnl
AC_LINK_IFELSE([dnl
AC_LANG_PROGRAM(
[#include <poll.h>],
[int rc; rc = poll((struct pollfd *)(0), 0, 0);])],
[ax_cv_have_poll=yes],
[ax_cv_have_poll=no])])
AS_IF([test "${ax_cv_have_poll}" = "yes"],
[AC_MSG_RESULT([yes])
$1],[AC_MSG_RESULT([no])
$2])
])dnl
AC_DEFUN([AX_HAVE_PPOLL], [dnl
AC_MSG_CHECKING([for ppoll(2)])
AC_CACHE_VAL([ax_cv_have_ppoll], [dnl
AC_LINK_IFELSE([dnl
AC_LANG_PROGRAM(
[dnl
#include <poll.h>
#include <signal.h>],
[dnl
int rc;
rc = poll((struct pollfd *)(0), 0, 0);
rc = ppoll((struct pollfd *)(0), 0, (struct timespec const *)(0), (sigset_t const *)(0));])],
[ax_cv_have_ppoll=yes],
[ax_cv_have_ppoll=no])])
AS_IF([test "${ax_cv_have_ppoll}" = "yes"],
[AC_MSG_RESULT([yes])
$1],[AC_MSG_RESULT([no])
$2])
])
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