--- /dev/null
+/* IOEngine_epoll.c - IOMultiplexer
+ * Copyright (C) 2012 Philipp Kreil (pk910)
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+#include "IOEngine.h"
+
+#ifdef HAVE_SYS_EPOLL_H
+#include <sys/epoll.h>
+#include <errno.h>
+#include <string.h>
+#include <unistd.h>
+
+#define MAX_EVENTS 32
+
+static int epoll_fd;
+
+static int engine_epoll_init() {
+ epoll_fd = epoll_create(1024);
+ if (epoll_fd < 0)
+ return 0;
+ return 1;
+}
+
+static void engine_epoll_add(struct IODescriptor *iofd) {
+ if(iofd->type == IOTYPE_TIMER) return;
+ //add descriptor to the epoll queue
+ struct epoll_event evt;
+ int res;
+
+ evt.events = EPOLLHUP | EPOLLIN | (iohandler_wants_writes(iofd) ? EPOLLOUT : 0);
+ evt.data.ptr = iofd;
+ res = epoll_ctl(epoll_fd, EPOLL_CTL_ADD, iofd->fd, &evt);
+ if(res < 0) {
+ iohandler_log(IOLOG_ERROR, "could not add IODescriptor %d to epoll queue. (returned: %d)", iofd->fd, res);
+ }
+}
+
+static void engine_epoll_remove(struct IODescriptor *iofd) {
+ if(iofd->type == IOTYPE_TIMER) return;
+ struct epoll_event evt;
+ epoll_ctl(epoll_fd, EPOLL_CTL_DEL, iofd->fd, &evt);
+}
+
+static void engine_epoll_update(struct IODescriptor *iofd) {
+ if(iofd->type == IOTYPE_TIMER) return;
+ if(iofd->state == IO_CLOSED) {
+ engine_epoll_remove(iofd);
+ return;
+ }
+ struct epoll_event evt;
+ int res;
+
+ evt.events = EPOLLHUP | EPOLLIN | (iohandler_wants_writes(iofd) ? EPOLLOUT : 0);
+ evt.data.ptr = iofd;
+ res = epoll_ctl(epoll_fd, EPOLL_CTL_MOD, iofd->fd, &evt);
+ if(res < 0) {
+ iohandler_log(IOLOG_ERROR, "could not update IODescriptor %d in epoll queue. (returned: %d)", iofd->fd, res);
+ }
+}
+
+static void engine_epoll_loop(struct timeval *timeout) {
+ struct epoll_event evts[MAX_EVENTS];
+ struct timeval now, tdiff;
+ int msec;
+ int events;
+ int epoll_result;
+
+ gettimeofday(&now, NULL);
+
+ while(timer_priority) {
+ tdiff.tv_sec = timer_priority->timeout.tv_sec - now.tv_sec;
+ tdiff.tv_usec = timer_priority->timeout.tv_usec - now.tv_usec;
+ if(tdiff.tv_sec < 0 || (tdiff.tv_sec == 0 && tdiff.tv_usec <= 0)) {
+ if(timer_priority->constant_timeout) {
+ tdiff.tv_sec = 0;
+ iohandler_set_timeout(timer_priority, &tdiff);
+ iohandler_events(timer_priority, 0, 0);
+ } else {
+ iohandler_events(timer_priority, 0, 0);
+ iohandler_close(timer_priority); //also sets timer_priority to the next timed element
+ }
+ continue;
+ } else if(tdiff.tv_usec < 0) {
+ tdiff.tv_sec--;
+ tdiff.tv_usec += 1000000; //1 sec
+ }
+ if(timeval_is_smaler((&tdiff), timeout)) {
+ timeout->tv_sec = tdiff.tv_sec;
+ timeout->tv_usec = tdiff.tv_usec;
+ }
+ break;
+ }
+
+ msec = timeout ? ((timeout->tv_sec * 1000 + timeout->tv_usec / 1000) + (timeout->tv_usec % 1000 != 0 ? 1 : 0)) : -1;
+
+ //select system call
+ epoll_result = epoll_wait(epoll_fd, evts, MAX_EVENTS, msec);
+
+ if (epoll_result < 0) {
+ if (errno != EINTR) {
+ iohandler_log(IOLOG_FATAL, "epoll_wait() failed with errno %d: %s", errno, strerror(errno));
+ return;
+ }
+ } else {
+ int i;
+ for(i = 0; i < epoll_result; i++) {
+ events = evts[i].events;
+ iohandler_events(evts[i].data.ptr, (events & (EPOLLIN | EPOLLHUP)), (events & EPOLLOUT));
+ }
+ }
+
+ //check timers
+ while(timer_priority) {
+ tdiff.tv_sec = timer_priority->timeout.tv_sec - now.tv_sec;
+ tdiff.tv_usec = timer_priority->timeout.tv_usec - now.tv_usec;
+ if(tdiff.tv_sec < 0 || (tdiff.tv_sec == 0 && tdiff.tv_usec <= 0)) {
+ if(timer_priority->constant_timeout) {
+ tdiff.tv_sec = 0;
+ iohandler_set_timeout(timer_priority, &tdiff);
+ iohandler_events(timer_priority, 0, 0);
+ } else {
+ iohandler_events(timer_priority, 0, 0);
+ iohandler_close(timer_priority); //also sets timer_priority to the next timed element
+ }
+ continue;
+ }
+ break;
+ }
+
+}
+
+static void engine_epoll_cleanup() {
+ close(epoll_fd);
+}
+
+struct IOEngine engine_epoll = {
+ .name = "epoll",
+ .init = engine_epoll_init,
+ .add = engine_epoll_add,
+ .remove = engine_epoll_remove,
+ .update = engine_epoll_update,
+ .loop = engine_epoll_loop,
+ .cleanup = engine_epoll_cleanup,
+};
+
+#else
+
+struct IOEngine engine_epoll = {
+ .name = "epoll",
+ .init = NULL,
+ .add = NULL,
+ .remove = NULL,
+ .update = NULL,
+ .loop = NULL,
+ .cleanup = NULL,
+};
+
+#endif