?RCS: $Id: d_epoll.U 167 2013-05-08 17:58:00Z rmanfredi $
?RCS:
?RCS: Copyright (c) 2006, Christian Biere
?RCS:
?RCS: You may redistribute only under the terms of the Artistic License,
?RCS: as specified in the README file that comes with the distribution.
?RCS: You may reuse parts of this distribution only within the terms of
?RCS: that same Artistic License; a copy of which may be found at the root
?RCS: of the source tree for dist 4.0.
?RCS:
?MAKE:d_epoll: Trylink cat
?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?
$cat >try.c <<EOC
#include <sys/types.h>
#include <sys/epoll.h>
int main(void)
{
  static struct epoll_event ev;
  static int ret, epfd;
  epfd |= epoll_create(1);
  ev.events |= EPOLLOUT; 
  ev.events |= EPOLLPRI; 
  ev.events |= EPOLLERR; 
  ev.events |= EPOLLHUP; 
  ev.events |= EPOLLET; 
  ev.data.ptr = (void *) 0; 
  ev.data.fd |= 1; 
  ev.data.u32 |= 1; 
  ev.data.u64 |= 1; 
  ret |= epoll_ctl(epfd, 1, EPOLL_CTL_ADD, &ev);
  ret |= epoll_ctl(epfd, 1, EPOLL_CTL_MOD, &ev);
  ret |= epoll_ctl(epfd, 1, EPOLL_CTL_DEL, &ev);
  ret |= epoll_wait(epfd, &ev, 1, -1);
  return 0 != ret;
}
EOC
cyn="whether epoll support is available"
set d_epoll
eval $trylink