void
bufferevent_trigger(struct bufferevent *bufev, short iotype, int options)
{
	bufferevent_incref_and_lock_(bufev);
	bufferevent_trigger_nolock_(bufev, iotype, options&BEV_TRIG_ALL_OPTS);
	bufferevent_decref_and_unlock_(bufev);
}
Example #2
0
static void
write_complete(struct event_overlapped *eo, ev_uintptr_t key,
    ev_ssize_t nbytes, int ok)
{
	struct bufferevent_async *bev_a = upcast_write(eo);
	struct bufferevent *bev = &bev_a->bev.bev;
	short what = BEV_EVENT_WRITING;
	ev_ssize_t amount_unwritten;

	BEV_LOCK(bev);
	EVUTIL_ASSERT(bev_a->write_in_progress);

	amount_unwritten = bev_a->write_in_progress - nbytes;
	evbuffer_commit_write_(bev->output, nbytes);
	bev_a->write_in_progress = 0;

	if (amount_unwritten)
		bufferevent_decrement_write_buckets_(&bev_a->bev,
		                                     -amount_unwritten);


	if (!ok)
		bev_async_set_wsa_error(bev, eo);

	if (bev_a->ok) {
		if (ok && nbytes) {
			BEV_RESET_GENERIC_WRITE_TIMEOUT(bev);
			bufferevent_trigger_nolock_(bev, EV_WRITE, 0);
			bev_async_consider_writing(bev_a);
		} else if (!ok) {
			what |= BEV_EVENT_ERROR;
			bev_a->ok = 0;
			bufferevent_run_eventcb_(bev, what, 0);
		} else if (!nbytes) {
			what |= BEV_EVENT_EOF;
			bev_a->ok = 0;
			bufferevent_run_eventcb_(bev, what, 0);
		}
	}

	bufferevent_decref_and_unlock_(bev);
}
Example #3
0
static void
bufferevent_writecb(evutil_socket_t fd, short event, void *arg)
{
	struct bufferevent *bufev = arg;
	struct bufferevent_private *bufev_p =
	    EVUTIL_UPCAST(bufev, struct bufferevent_private, bev);
	int res = 0;
	short what = BEV_EVENT_WRITING;
	int connected = 0;
	ev_ssize_t atmost = -1;

	bufferevent_incref_and_lock_(bufev);

	if (event == EV_TIMEOUT) {
		/* Note that we only check for event==EV_TIMEOUT. If
		 * event==EV_TIMEOUT|EV_WRITE, we can safely ignore the
		 * timeout, since a read has occurred */
		what |= BEV_EVENT_TIMEOUT;
		goto error;
	}
	if (bufev_p->connecting) {
		int c = evutil_socket_finished_connecting_(fd);
		/* we need to fake the error if the connection was refused
		 * immediately - usually connection to localhost on BSD */
		if (bufev_p->connection_refused) {
		  bufev_p->connection_refused = 0;
		  c = -1;
		}

		if (c == 0)
			goto done;

		bufev_p->connecting = 0;
		if (c < 0) {
			event_del(&bufev->ev_write);
			event_del(&bufev->ev_read);
			bufferevent_run_eventcb_(bufev, BEV_EVENT_ERROR, 0);
			goto done;
		} else {
			connected = 1;
			bufferevent_socket_set_conn_address_fd(bufev_p, fd);
#ifdef _WIN32
			if (BEV_IS_ASYNC(bufev)) {
				event_del(&bufev->ev_write);
				bufferevent_async_set_connected_(bufev);
				bufferevent_run_eventcb_(bufev,
						BEV_EVENT_CONNECTED, 0);
				goto done;
			}
#endif
			bufferevent_run_eventcb_(bufev,
					BEV_EVENT_CONNECTED, 0);
			if (!(bufev->enabled & EV_WRITE) ||
			    bufev_p->write_suspended) {
				event_del(&bufev->ev_write);
				goto done;
			}
		}
	}

	atmost = bufferevent_get_write_max_(bufev_p);

	if (bufev_p->write_suspended)
		goto done;

	if (evbuffer_get_length(bufev->output)) {
		evbuffer_unfreeze(bufev->output, 1);
		res = evbuffer_write_atmost(bufev->output, fd, atmost);
		evbuffer_freeze(bufev->output, 1);
		if (res == -1) {
			int err = evutil_socket_geterror(fd);
			if (EVUTIL_ERR_RW_RETRIABLE(err))
				goto reschedule;
			what |= BEV_EVENT_ERROR;
		} else if (res == 0) {
			/* eof case
			   XXXX Actually, a 0 on write doesn't indicate
			   an EOF. An ECONNRESET might be more typical.
			 */
			what |= BEV_EVENT_EOF;
		}
		if (res <= 0)
			goto error;

		bufferevent_decrement_write_buckets_(bufev_p, res);
	}

	if (evbuffer_get_length(bufev->output) == 0) {
		event_del(&bufev->ev_write);
	}

	/*
	 * Invoke the user callback if our buffer is drained or below the
	 * low watermark.
	 */
	if (res || !connected) {
		bufferevent_trigger_nolock_(bufev, EV_WRITE, 0);
	}

	goto done;

 reschedule:
	if (evbuffer_get_length(bufev->output) == 0) {
		event_del(&bufev->ev_write);
	}
	goto done;

 error:
	bufferevent_disable(bufev, EV_WRITE);
	bufferevent_run_eventcb_(bufev, what, 0);

 done:
	bufferevent_decref_and_unlock_(bufev);
}
Example #4
0
static void
bufferevent_readcb(evutil_socket_t fd, short event, void *arg)
{
	struct bufferevent *bufev = arg;
	struct bufferevent_private *bufev_p =
	    EVUTIL_UPCAST(bufev, struct bufferevent_private, bev);
	struct evbuffer *input;
	int res = 0;
	short what = BEV_EVENT_READING;
	ev_ssize_t howmuch = -1, readmax=-1;

	bufferevent_incref_and_lock_(bufev);

	if (event == EV_TIMEOUT) {
		/* Note that we only check for event==EV_TIMEOUT. If
		 * event==EV_TIMEOUT|EV_READ, we can safely ignore the
		 * timeout, since a read has occurred */
		what |= BEV_EVENT_TIMEOUT;
		goto error;
	}

	input = bufev->input;

	/*
	 * If we have a high watermark configured then we don't want to
	 * read more data than would make us reach the watermark.
	 */
	if (bufev->wm_read.high != 0) {
		howmuch = bufev->wm_read.high - evbuffer_get_length(input);
		/* we somehow lowered the watermark, stop reading */
		if (howmuch <= 0) {
			bufferevent_wm_suspend_read(bufev);
			goto done;
		}
	}
	readmax = bufferevent_get_read_max_(bufev_p);
	if (howmuch < 0 || howmuch > readmax) /* The use of -1 for "unlimited"
					       * uglifies this code. XXXX */
		howmuch = readmax;
	if (bufev_p->read_suspended)
		goto done;

	evbuffer_unfreeze(input, 0);
	res = evbuffer_read(input, fd, (int)howmuch); /* XXXX evbuffer_read would do better to take and return ev_ssize_t */
	evbuffer_freeze(input, 0);

	if (res == -1) {
		int err = evutil_socket_geterror(fd);
		if (EVUTIL_ERR_RW_RETRIABLE(err))
			goto reschedule;
		/* error case */
		what |= BEV_EVENT_ERROR;
	} else if (res == 0) {
		/* eof case */
		what |= BEV_EVENT_EOF;
	}

	if (res <= 0)
		goto error;

	bufferevent_decrement_read_buckets_(bufev_p, res);

	/* Invoke the user callback - must always be called last */
	bufferevent_trigger_nolock_(bufev, EV_READ, 0);

	goto done;

 reschedule:
	goto done;

 error:
	bufferevent_disable(bufev, EV_READ);
	bufferevent_run_eventcb_(bufev, what, 0);

 done:
	bufferevent_decref_and_unlock_(bufev);
}