util: introduce epoll_del_rfd

travis-ci: success for lazy-pages: add non-#PF events handling (rev2)
Signed-off-by: Mike Rapoport <rppt@linux.vnet.ibm.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

criu/include/util.h

@@ -323,6 +323,7 @@ struct epoll_rfd {
 };
 
 extern int epoll_add_rfd(int epfd, struct epoll_rfd *);
+extern int epoll_del_rfd(int epfd, struct epoll_rfd *rfd);
 extern int epoll_run_rfds(int epfd, struct epoll_event *evs, int nr_fds, int tmo);
 extern int epoll_prepare(int nr_events, struct epoll_event **evs);
 

criu/util.c

@@ -1228,6 +1228,16 @@ int epoll_add_rfd(int epfd, struct epoll_rfd *rfd)
 	return 0;
 }
 
+int epoll_del_rfd(int epfd, struct epoll_rfd *rfd)
+{
+	if (epoll_ctl(epfd, EPOLL_CTL_DEL, rfd->fd, NULL) == -1) {
+		pr_perror("epoll_ctl failed");
+		return -1;
+	}
+
+	return 0;
+}
+
 int epoll_run_rfds(int epollfd, struct epoll_event *evs, int nr_fds, int timeout)
 {
 	int ret, i, nr_events;