dnl ---------------------------------------------------------------------------
dnl
dnl Copyright 2006-2009,2010 by Thomas E. Dickey
dnl
dnl                         All Rights Reserved
dnl
dnl Permission to use, copy, modify, and distribute this software and its
dnl documentation for any purpose and without fee is hereby granted,
dnl provided that the above copyright notice appear in all copies and that
dnl both that copyright notice and this permission notice appear in
dnl supporting documentation, and that the name of the above listed
dnl copyright holder(s) not be used in advertising or publicity pertaining
dnl to distribution of the software without specific, written prior
dnl permission.
dnl
dnl THE ABOVE LISTED COPYRIGHT HOLDER(S) DISCLAIM ALL WARRANTIES WITH REGARD
dnl TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
dnl AND FITNESS, IN NO EVENT SHALL THE ABOVE LISTED COPYRIGHT HOLDER(S) BE
dnl LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
dnl WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
dnl ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
dnl OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
dnl
dnl ---------------------------------------------------------------------------

dnl ---------------------------------------------------------------------------
dnl CF_FUNC_POLL version: 4 updated: 2006/12/16 12:33:30
dnl ------------
dnl See if the poll function really works.  Some platforms have poll(), but
dnl it does not work for terminals or files.
AC_DEFUN([CF_FUNC_POLL],[
AC_CACHE_CHECK(if poll really works,cf_cv_working_poll,[
AC_TRY_RUN([
#include <stdio.h>
#ifdef HAVE_POLL_H
#include <poll.h>
#else
#include <sys/poll.h>
#endif
int main() {
	struct pollfd myfds;
	int ret;

	myfds.fd = 0;
	myfds.events = POLLIN;

	ret = poll(&myfds, 1, 100);
	${cf_cv_main_return:-return}(ret != 0);
}],
	[cf_cv_working_poll=yes],
	[cf_cv_working_poll=no],
	[cf_cv_working_poll=unknown])])
test "$cf_cv_working_poll" = "yes" && AC_DEFINE(HAVE_WORKING_POLL, 1, [poll() works])
])dnl

dnl ---------------------------------------------------------------------------
dnl CF_SIGWINCH version: 1 updated: 2006/04/02 16:41:09
dnl -----------
dnl Use this macro after CF_XOPEN_SOURCE, but do not require it (not all
dnl programs need this test).
dnl
dnl This is really a MacOS X 10.4.3 workaround.  Defining _POSIX_C_SOURCE
dnl forces SIGWINCH to be undefined (breaks xterm, ncurses).  Oddly, the struct
dnl winsize declaration is left alone - we may revisit this if Apple choose to
dnl break that part of the interface as well.
AC_DEFUN([CF_SIGWINCH],
[
AC_CACHE_CHECK(if SIGWINCH is defined,cf_cv_define_sigwinch,[
	AC_TRY_COMPILE([
#include <sys/types.h>
#include <sys/signal.h>
],[int x = SIGWINCH],
	[cf_cv_define_sigwinch=yes],
	[AC_TRY_COMPILE([
#undef _XOPEN_SOURCE
#undef _POSIX_SOURCE
#undef _POSIX_C_SOURCE
#include <sys/types.h>
#include <sys/signal.h>
],[int x = SIGWINCH],
	[cf_cv_define_sigwinch=maybe],
	[cf_cv_define_sigwinch=no])
])
])

if test "$cf_cv_define_sigwinch" = maybe ; then
AC_CACHE_CHECK(for actual SIGWINCH definition,cf_cv_fixup_sigwinch,[
cf_cv_fixup_sigwinch=unknown
cf_sigwinch=32
while test $cf_sigwinch != 1
do
	AC_TRY_COMPILE([
#undef _XOPEN_SOURCE
#undef _POSIX_SOURCE
#undef _POSIX_C_SOURCE
#include <sys/types.h>
#include <sys/signal.h>
],[
#if SIGWINCH != $cf_sigwinch
make an error
#endif
int x = SIGWINCH],
	[cf_cv_fixup_sigwinch=$cf_sigwinch
	 break])

cf_sigwinch=`expr $cf_sigwinch - 1`
done
])

	if test "$cf_cv_fixup_sigwinch" != unknown ; then
		CPPFLAGS="$CPPFLAGS -DSIGWINCH=$cf_cv_fixup_sigwinch"
	fi
fi
])dnl