?RCS: $Id: d_devpoll.U 11853 2006-09-01 22:53:38Z cbiere $
?RCS:
?RCS: @COPYRIGHT@
?RCS:
?MAKE:d_dev_poll: Myread Setvar cat rm +cc +ccflags +ldflags
?MAKE:	-pick add $@ %<
?S:d_dev_poll:
?S:	This variable conditionally defines the HAS_DEV_POLL symbol, which
?S:	indicates to the C program that /dev/poll support is available.
?S:.
?C:HAS_DEV_POLL:
?C:	This symbol is defined when /dev/poll can be used.
?C:.
?H:#$d_dev_poll HAS_DEV_POLL
?H:.
?LINT: set d_dev_poll
: can we use /dev/poll?
echo " "
echo "Checking whether /dev/poll is available ..." >&4
val="$define"
$cat >try.c <<'EOC'
#include <poll.h>
#include <stropts.h>
#include <sys/devpoll.h>

int
main(void) {
  static struct pollfd pfds[1];
  static struct dvpoll dvp;
  static int ret;

  pfds[0].fd |= 1;
  pfds[0].events |= POLLIN | POLLPRI | POLLOUT | POLLHUP | POLLERR | POLLNVAL;
  pfds[0].events |= POLLREMOVE;
  pfds[0].revents |= 1;

  dvp.dp_timeout |= 1;
  dvp.dp_nfds |= 1;
  dvp.dp_fds = pfds;

  ret |= ioctl(1, DP_POLL, &dvp);

  return 0;
}
EOC
if $cc $ccflags $ldflags -o try try.c >/dev/null 2>&1; then
    $cat <<'EOM'
It looks like /dev/poll is usable on your system, good.
EOM
else
	echo "Sorry, I will not be using /dev/poll."
	val="$undef"
fi
$rm -f try try.c
set d_dev_poll
eval $setvar