/** Terminate sources.
*
* Close listening Sockets and shutdown() others
*
* XXX: This function is not very efficient (going through the linked list of
* channels and repeatedly calling functions which do the same), but it's only
* used for cleanup, so it should be fine.
*
* \see eventloop_stop
*/
static void terminate_fds(void)
{
Channel *ch = self.channels, *next;
while (ch != NULL) {
next = ch->next;
o_log(O_LOG_DEBUG4, "EventLoop: Terminating channel %s\n", ch->name);
if (!ch->is_active ||
socket_is_disconnected(ch->socket) ||
socket_is_listening(ch->socket)) {
o_log(O_LOG_DEBUG3, "EventLoop: Releasing listening channel %s\n", ch->name);
eventloop_socket_release((SockEvtSource*)ch);
} else if (self.force_stop) {
o_log(O_LOG_DEBUG3, "EventLoop: Closing down %s\n", ch->name);
eventloop_socket_release((SockEvtSource*)ch);
socket_close(ch->socket);
} else {
o_log(O_LOG_DEBUG3, "EventLoop: Shutting down %s\n", ch->name);
socket_shutdown(ch->socket);
ch->is_shutting_down = 1;
}
ch = next;
}
update_fds();
}
static void
rescan(devevent_t *de)
{
int i;
char path[32];
char name[80];
for(i = 0; i < DE_MAXDEVS; i++) {
de_dev_t *dd = &de->de_devs[i];
snprintf(path, sizeof(path), "/dev/input/event%d", i);
if(dd->dd_present) {
if(!access(path, O_RDWR))
continue;
TRACE(TRACE_INFO, "DE", "Device %s disconnected", path);
close(dd->dd_fd);
dd->dd_present = 0;
} else {
dd->dd_fd = open(path, O_RDWR);
if(dd->dd_fd == -1)
continue;
name[sizeof(name) - 1] = 0;
if(ioctl(dd->dd_fd, EVIOCGNAME(sizeof(name) - 1), &name) < 1)
strcpy(name, "???");
TRACE(TRACE_INFO, "DE", "Found %s on %s", name, path);
dd->dd_present = 1;
}
}
update_fds(de);
}
/** Run the global EventLoop until eventloop_stop() or eventloop_terminate() is called.
*
* The loop is based around the poll(3) system call. It monitor event sources
* such as Channel or Timers, registered in the respective fields of the global
* EventLoop object self. It first consider all timers to find whether some
* have expired and to set the timeout for the poll(3) call. It then calls
* poll(3) on the file descriptors (STDIN or sockets) related to active
* Channels, and runs the relevant callbacks for those with pending events. It
* finally executes the callback functions of the expired timers. The loop
* will not return until eventloop_stop() or eventloop_terminate() is called.
* In the former case, it will try to wait until all active sockets are close,
* while not in the latter.
*
* \return the (non-zero) value passed to eventloop_stop() or eventloop_terminate()
*
* \see eventloop_init, eventloop_stop, eventloop_terminate
* \eventloop_on_stdin, eventloop_on_monitor_in_channel, eventloop_on_read_in_channel, eventloop_on_out_channel
* \see o_el_timer_callback, o_el_read_socket_callback, o_el_monitor_socket_callback, o_el_state_socket_callback, o_el_timer_callback
* \see poll(3)
*/
int eventloop_run()
{
int i;
self.stopping = 0;
self.force_stop = 0;
self.start = self.now = self.last_reaped = time(NULL);
while (!self.stopping || (self.size>0 && !self.force_stop)) {
// Check for active timers
int timeout = -1;
TimerInt* t = self.timers;
while (t != NULL) {
if (t->is_active) {
int delta = 1000 * (t->due_time - self.now);
if (delta < 0) delta = 0; // overdue
if (delta < timeout || timeout < 0) timeout = delta;
}
t = t->next;
}
if (timeout != -1)
o_log(O_LOG_DEBUG3, "EventLoop: Timeout = %d\n", timeout);
if (self.fds_dirty)
if (update_fds()<1 && timeout < 0) /* No FD nor timeout */
continue;
o_log(O_LOG_DEBUG4, "EventLoop: About to poll() on %d FDs with a timeout of %ds\n", self.size, timeout);
/* for(i=0; i < self.size; i++) {
o_log(O_LOG_DEBUG4, "EventLoop: FD %d->%s\n", self.fds[i].fd, self.fds_channels[i]->name);
} */
int count = poll(self.fds, self.size, timeout);
self.now = time(NULL);
if (count < 1) {
o_log(O_LOG_DEBUG4, "EventLoop: Timeout\n");
} else {
// Check sockets
i = 0;
o_log(O_LOG_DEBUG4, "EventLoop: Got events\n");
for (; i < self.size; i++) {
Channel* ch = self.fds_channels[i];
if (self.fds[i].revents & POLLERR) {
char buf[32];
SocketStatus status;
int len;
if ((len = recv(self.fds[i].fd, buf, 32, 0)) <= 0) {
switch (errno) {
case ECONNREFUSED:
status = SOCKET_CONN_REFUSED;
break;
default:
status = SOCKET_UNKNOWN;
if (!ch->status_cbk) {
o_log(O_LOG_ERROR, "EventLoop: While reading from socket '%s': (%d) %s\n",
ch->name, errno, strerror(errno));
}
}
eventloop_socket_activate((SockEvtSource*)ch, 0);
do_status_callback (ch, status, errno);
} else {
o_log(O_LOG_ERROR, "EventLoop: Expected error on socket '%s' but read '%s'\n", ch->name, buf);
}
} else if (self.fds[i].revents & POLLHUP) {
eventloop_socket_activate((SockEvtSource*)ch, 0);
/* Client closed the connection, but there might still be bytes
for us to read from our end of the connection. */
int len;
int fd = self.fds[i].fd;
char buf[MAX_READ_BUFFER_SIZE];
do {
if (fd == 0) {
len = read(fd, buf, MAX_READ_BUFFER_SIZE);
} else {
len = recv(fd, buf, 512, 0);
}
if (len > 0) {
o_log(O_LOG_DEBUG3, "EventLoop: Received last %i bytes\n", len);
do_read_callback (ch, buf, len);
}
} while (len > 0);
do_status_callback (ch, SOCKET_CONN_CLOSED, 0);
} else if (self.fds[i].revents & POLLIN) {
char buf[MAX_READ_BUFFER_SIZE];
if (ch->read_cbk) {
int len;
int fd = self.fds[i].fd;
if (fd == 0) {
// stdin
len = read(fd, buf, MAX_READ_BUFFER_SIZE);
} else {
// socket
len = recv(fd, buf, 512, 0);
}
ch->last_activity = self.now;
if (len > 0) {
o_log(O_LOG_DEBUG3, "EventLoop: Received %i bytes\n", len);
do_read_callback (ch, buf, len);
} else if (len == 0 && ch->socket != NULL) { // skip stdin
// closed down
eventloop_socket_activate((SockEvtSource*)ch, 0);
do_status_callback (ch, SOCKET_CONN_CLOSED, 0);
} else if (len < 0) {
if (errno == ENOTSOCK) {
o_log(O_LOG_ERROR,
"EventLoop: Monitored socket '%s' is now invalid; "
"removing from monitored set\n",
ch->name);
eventloop_socket_remove ((SockEvtSource*)ch);
} else {
o_log(O_LOG_ERROR, "EventLoop: Unrecognized read error not handled (errno=%d)\n",
errno);
}
}
} else {
do_monitor_callback (ch);
}
} else if (ch->is_shutting_down) {
/* The socket was shutting down, and nothing new has appeared;
* We flushed the buffers, mark it as removable */
eventloop_socket_release((SockEvtSource*)ch);
}
if (self.fds[i].revents & POLLOUT) {
do_status_callback(ch, SOCKET_WRITEABLE, 0);
if (0 != ch->last_activity) {
/* If we track the activity of this socket */
ch->last_activity = self.now;
}
}
if (self.fds[i].revents & POLLNVAL) {
o_log(O_LOG_WARN, "EventLoop: socket '%s' invalid, deactivating...\n", ch->name);
eventloop_socket_activate((SockEvtSource*)ch, 0);
do_status_callback(ch, SOCKET_DROPPED, 0);
}
/* We reap idle channels as we go through the list. XXX: There might
* be a corner case where all FDs are already used, and some of them
* idle, however a new a new connection (on one listening socket early
* in the list) would be dropped before cleanup triggered by its
* arrival freed the resources it needs (from the idle sockets further
* towards the end of the list. See #959.*/
if (ch->last_activity != 0 &&
self.socket_timeout > 0 &&
self.now - ch->last_activity > self.socket_timeout) {
o_log(O_LOG_DEBUG2, "EventLoop: Socket '%s' idle for %ds, reaping...\n", ch->name, self.now - ch->last_activity);
do_status_callback(ch, SOCKET_IDLE, 0);
}
}
for (i = 0; i < self.size; i++) {
Channel* ch = self.fds_channels[i];
if (ch->is_removable)
eventloop_socket_remove ((SockEvtSource*)ch);
}
}
if (timeout >= 0) {
// check timers
TimerInt* t = self.timers;
while (t != NULL) {
if (t->is_active) {
if (t->due_time <= self.now) {
// fires
o_log(O_LOG_DEBUG2, "EventLoop: Timer '%s' fired\n", t->name);
if (t->callback) t->callback((TimerEvtSource*)t, t->handle);
if (t->is_periodic) {
while ((t->due_time += t->period) < self.now) {
// should really only happen during debugging
o_log(O_LOG_WARN, "EventLoop: Skipped timer period for '%s'\n",
t->name);
}
} else {
t->is_active = 0;
}
}
}
t = t->next;
}
}
}
return self.stopping;
}