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+# ===========================================================================
+# http://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 7
+
+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])
+])