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# ===========================================================================
# https://www.gnu.org/software/autoconf-archive/ax_have_select.html
# ===========================================================================
#
# SYNOPSIS
#
# AX_HAVE_SELECT([ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND])
# AX_HAVE_PSELECT([ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND])
#
# DESCRIPTION
#
# This macro determines whether the system supports the select I/O event
# interface. A neat usage example would be:
#
# AX_HAVE_SELECT(
# [AX_CONFIG_FEATURE_ENABLE(select)],
# [AX_CONFIG_FEATURE_DISABLE(select)])
# AX_CONFIG_FEATURE(
# [select], [This platform supports select(7)],
# [HAVE_SELECT], [This platform supports select(7).])
#
# Some systems also have the variant pselect(). The availability of that
# function can be tested with the second macro. Generally speaking, it is
# safe to assume that AX_HAVE_SELECT would succeed if AX_HAVE_SELECT_PWAIT
# 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_SELECT], [dnl
AC_MSG_CHECKING([for select(2)])
AC_CACHE_VAL([ax_cv_have_select], [dnl
AC_LINK_IFELSE([dnl
AC_LANG_PROGRAM(
[#include <sys/select.h>],
[int rc; rc = select(0, (fd_set *)(0), (fd_set *)(0), (fd_set *)(0), (struct timeval *)(0));])],
[ax_cv_have_select=yes],
[ax_cv_have_select=no])])
AS_IF([test "${ax_cv_have_select}" = "yes"],
[AC_MSG_RESULT([yes])
$1],[AC_MSG_RESULT([no])
$2])
])dnl
AC_DEFUN([AX_HAVE_PSELECT], [dnl
AC_MSG_CHECKING([for pselect(2)])
AC_CACHE_VAL([ax_cv_have_pselect], [dnl
AC_LINK_IFELSE([dnl
AC_LANG_PROGRAM(
[dnl
#include <sys/select.h>
#include <signal.h>],
[dnl
int rc;
rc = select(0, (fd_set *)(0), (fd_set *)(0), (fd_set *)(0), (struct timeval *)(0));
rc = pselect(0, (fd_set *)(0), (fd_set *)(0), (fd_set *)(0), (struct timespec const *)(0), (sigset_t const *)(0));])],
[ax_cv_have_pselect=yes],
[ax_cv_have_pselect=no])])
AS_IF([test "${ax_cv_have_pselect}" = "yes"],
[AC_MSG_RESULT([yes])
$1],[AC_MSG_RESULT([no])
$2])
])dnl
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