?RCS: $Id: d_epoll.U 9719 2005-10-01 16:23:49Z cbiere $
?RCS:
?RCS: @COPYRIGHT@
?RCS:
?MAKE:d_epoll: Myread Setvar cat rm +cc +ccflags +ldflags
?MAKE:	-pick add $@ %<
?S:d_epoll:
?S:	This variable conditionally defines the HAS_EPOLL symbol, which
?S:	indicates to the C program that epoll() support is available.
?S:.
?C:HAS_EPOLL:
?C:	This symbol is defined when epoll() can be used.
?C:.
?H:#$d_epoll HAS_EPOLL
?H:.
?LINT: set d_epoll
: can we use epoll?
echo " "
echo "Checking whether epoll() is available ..." >&4
val="$define"
$cat >try.c <<'EOC'
#include <sys/types.h>
#include <sys/epoll.h>
int
main(void) {
  struct epoll_event ev[1];
  int ret, epfd;

  epfd = epoll_create(1);
  
  ev[0].events = EPOLLIN | EPOLLOUT | EPOLLPRI | EPOLLERR | EPOLLHUP | EPOLLET; 
  ev[0].data.ptr = (void *) 0; 
  ev[0].data.fd = 1; 
  ev[0].data.u32 = 1; 
  ev[0].data.u64 = 1; 
  
  ret = epoll_ctl(epfd, 1, EPOLL_CTL_ADD, &ev[0]);
  ret = epoll_ctl(epfd, 1, EPOLL_CTL_MOD, &ev[0]);
  ret = epoll_ctl(epfd, 1, EPOLL_CTL_DEL, &ev[0]);
  
  ret = epoll_wait(epfd, &ev[0], 1, -1);

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