Ejemplo n.º 1
0
/* Gets one text line out of a channel's buffer from a stream interface.
 * Return values :
 *   >0 : number of bytes read. Includes the \n if present before len or end.
 *   =0 : no '\n' before end found. <str> is left undefined.
 *   <0 : no more bytes readable because output is shut.
 * The channel status is not changed. The caller must call bo_skip() to
 * update it. The '\n' is waited for as long as neither the buffer nor the
 * output are full. If either of them is full, the string may be returned
 * as is, without the '\n'.
 */
int bo_getline(struct channel *chn, char *str, int len)
{
	int ret, max;
	char *p;

	ret = 0;
	max = len;

	/* closed or empty + imminent close = -1; empty = 0 */
	if (unlikely((chn->flags & CF_SHUTW) || channel_is_empty(chn))) {
		if (chn->flags & (CF_SHUTW|CF_SHUTW_NOW))
			ret = -1;
		goto out;
	}

	p = bo_ptr(chn->buf);

	if (max > chn->buf->o) {
		max = chn->buf->o;
		str[max-1] = 0;
	}
	while (max) {
		*str++ = *p;
		ret++;
		max--;

		if (*p == '\n')
			break;
		p = buffer_wrap_add(chn->buf, p + 1);
	}
	if (ret > 0 && ret < len &&
	    (ret < chn->buf->o || !channel_full(chn)) &&
	    *(str-1) != '\n' &&
	    !(chn->flags & (CF_SHUTW|CF_SHUTW_NOW)))
		ret = 0;
 out:
	if (max)
		*str = 0;
	return ret;
}
Ejemplo n.º 2
0
/* default chk_rcv function for scheduled tasks */
static void stream_int_chk_rcv(struct stream_interface *si)
{
	struct channel *ib = si->ib;

	DPRINTF(stderr, "%s: si=%p, si->state=%d ib->flags=%08x ob->flags=%08x\n",
		__FUNCTION__,
		si, si->state, si->ib->flags, si->ob->flags);

	if (unlikely(si->state != SI_ST_EST || (ib->flags & (CF_SHUTR|CF_DONT_READ))))
		return;

	if (channel_full(ib)) {
		/* stop reading */
		si->flags |= SI_FL_WAIT_ROOM;
	}
	else {
		/* (re)start reading */
		si->flags &= ~SI_FL_WAIT_ROOM;
		if (!(si->flags & SI_FL_DONT_WAKE) && si->owner)
			task_wakeup(si->owner, TASK_WOKEN_IO);
	}
}
Ejemplo n.º 3
0
/* This function is used for inter-stream-interface calls. It is called by the
 * consumer to inform the producer side that it may be interested in checking
 * for free space in the buffer. Note that it intentionally does not update
 * timeouts, so that we can still check them later at wake-up. This function is
 * dedicated to connection-based stream interfaces.
 */
static void stream_int_chk_rcv_conn(struct stream_interface *si)
{
	struct channel *ib = si->ib;

	if (unlikely(si->state > SI_ST_EST || (ib->flags & CF_SHUTR)))
		return;

	conn_refresh_polling_flags(si->conn);

	if ((ib->flags & CF_DONT_READ) || channel_full(ib)) {
		/* stop reading */
		if (!(ib->flags & CF_DONT_READ)) /* full */
			si->flags |= SI_FL_WAIT_ROOM;
		__conn_data_stop_recv(si->conn);
	}
	else {
		/* (re)start reading */
		si->flags &= ~SI_FL_WAIT_ROOM;
		__conn_data_want_recv(si->conn);
	}
	conn_cond_update_data_polling(si->conn);
}
Ejemplo n.º 4
0
/* extracts some payload at a fixed position and length */
static int
smp_fetch_payload(struct proxy *px, struct session *s, void *l7, unsigned int opt,
                  const struct arg *arg_p, struct sample *smp, const char *kw)
{
	unsigned int buf_offset = arg_p[0].data.uint;
	unsigned int buf_size = arg_p[1].data.uint;
	struct channel *chn;

	if (!s)
		return 0;

	chn = ((opt & SMP_OPT_DIR) == SMP_OPT_DIR_RES) ? s->rep : s->req;

	if (!chn)
		return 0;

	if (buf_size > chn->buf->size || buf_offset + buf_size > chn->buf->size) {
		/* will never match */
		smp->flags = 0;
		return 0;
	}

	if (buf_offset + buf_size > chn->buf->i)
		goto too_short;

	/* init chunk as read only */
	smp->type = SMP_T_CBIN;
	chunk_initlen(&smp->data.str, chn->buf->p + buf_offset, 0, buf_size ? buf_size : (chn->buf->i - buf_offset));
	smp->flags = SMP_F_VOLATILE;
	if (!buf_size && !channel_full(chn) && !channel_input_closed(chn))
		smp->flags |= SMP_F_MAY_CHANGE;

	return 1;

 too_short:
	smp->flags = SMP_F_MAY_CHANGE;
	return 0;
}
Ejemplo n.º 5
0
/* Tries to copy character <c> into the channel's buffer after some length
 * controls. The chn->o and to_forward pointers are updated. If the channel
 * input is closed, -2 is returned. If there is not enough room left in the
 * buffer, -1 is returned. Otherwise the number of bytes copied is returned
 * (1). Channel flag READ_PARTIAL is updated if some data can be transferred.
 * Channel flag CF_WAKE_WRITE is set if the write fails because the buffer is
 * full.
 */
int bi_putchr(struct channel *chn, char c)
{
	if (unlikely(channel_input_closed(chn)))
		return -2;

	if (channel_full(chn)) {
		chn->flags |= CF_WAKE_WRITE;
		return -1;
	}

	*bi_end(chn->buf) = c;

	chn->buf->i++;
	chn->flags |= CF_READ_PARTIAL;

	if (chn->to_forward >= 1) {
		if (chn->to_forward != CHN_INFINITE_FORWARD)
			chn->to_forward--;
		b_adv(chn->buf, 1);
	}

	chn->total++;
	return 1;
}
Ejemplo n.º 6
0
/* Updates the timers and flags of a stream interface attached to a connection,
 * depending on the buffers' flags. It should only be called once after the
 * buffer flags have settled down, and before they are cleared. It doesn't
 * harm to call it as often as desired (it just slightly hurts performance).
 * It is only meant to be called by upper layers after buffer flags have been
 * manipulated by analysers.
 */
void stream_int_update_conn(struct stream_interface *si)
{
	struct channel *ib = si->ib;
	struct channel *ob = si->ob;
	struct connection *conn = __objt_conn(si->end);

	/* Check if we need to close the read side */
	if (!(ib->flags & CF_SHUTR)) {
		/* Read not closed, update FD status and timeout for reads */
		if ((ib->flags & CF_DONT_READ) || channel_full(ib)) {
			/* stop reading */
			if (!(si->flags & SI_FL_WAIT_ROOM)) {
				if (!(ib->flags & CF_DONT_READ)) /* full */
					si->flags |= SI_FL_WAIT_ROOM;
				conn_data_stop_recv(conn);
				ib->rex = TICK_ETERNITY;
			}
		}
		else {
			/* (re)start reading and update timeout. Note: we don't recompute the timeout
			 * everytime we get here, otherwise it would risk never to expire. We only
			 * update it if is was not yet set. The stream socket handler will already
			 * have updated it if there has been a completed I/O.
			 */
			si->flags &= ~SI_FL_WAIT_ROOM;
			conn_data_want_recv(conn);
			if (!(ib->flags & (CF_READ_NOEXP|CF_DONT_READ)) && !tick_isset(ib->rex))
				ib->rex = tick_add_ifset(now_ms, ib->rto);
		}
	}

	/* Check if we need to close the write side */
	if (!(ob->flags & CF_SHUTW)) {
		/* Write not closed, update FD status and timeout for writes */
		if (channel_is_empty(ob)) {
			/* stop writing */
			if (!(si->flags & SI_FL_WAIT_DATA)) {
				if ((ob->flags & CF_SHUTW_NOW) == 0)
					si->flags |= SI_FL_WAIT_DATA;
				conn_data_stop_send(conn);
				ob->wex = TICK_ETERNITY;
			}
		}
		else {
			/* (re)start writing and update timeout. Note: we don't recompute the timeout
			 * everytime we get here, otherwise it would risk never to expire. We only
			 * update it if is was not yet set. The stream socket handler will already
			 * have updated it if there has been a completed I/O.
			 */
			si->flags &= ~SI_FL_WAIT_DATA;
			conn_data_want_send(conn);
			if (!tick_isset(ob->wex)) {
				ob->wex = tick_add_ifset(now_ms, ob->wto);
				if (tick_isset(ib->rex) && !(si->flags & SI_FL_INDEP_STR)) {
					/* Note: depending on the protocol, we don't know if we're waiting
					 * for incoming data or not. So in order to prevent the socket from
					 * expiring read timeouts during writes, we refresh the read timeout,
					 * except if it was already infinite or if we have explicitly setup
					 * independent streams.
					 */
					ib->rex = tick_add_ifset(now_ms, ib->rto);
				}
			}
		}
	}
}
Ejemplo n.º 7
0
/* Callback to be used by connection I/O handlers upon completion. It differs from
 * the update function in that it is designed to be called by lower layers after I/O
 * events have been completed. It will also try to wake the associated task up if
 * an important event requires special handling. It relies on the connection handler
 * to commit any polling updates. The function always returns 0.
 */
static int si_conn_wake_cb(struct connection *conn)
{
	struct stream_interface *si = conn->owner;

	DPRINTF(stderr, "%s: si=%p, si->state=%d ib->flags=%08x ob->flags=%08x\n",
		__FUNCTION__,
		si, si->state, si->ib->flags, si->ob->flags);

	if (conn->flags & CO_FL_ERROR)
		si->flags |= SI_FL_ERR;

	/* check for recent connection establishment */
	if (unlikely(!(conn->flags & (CO_FL_WAIT_L4_CONN | CO_FL_WAIT_L6_CONN | CO_FL_CONNECTED)))) {
		si->exp = TICK_ETERNITY;
		si->ob->flags |= CF_WRITE_NULL;
	}

	/* process consumer side */
	if (channel_is_empty(si->ob)) {
		if (((si->ob->flags & (CF_SHUTW|CF_SHUTW_NOW)) == CF_SHUTW_NOW) &&
		    (si->state == SI_ST_EST))
			stream_int_shutw_conn(si);
		__conn_data_stop_send(conn);
		si->ob->wex = TICK_ETERNITY;
	}

	if ((si->ob->flags & (CF_SHUTW|CF_SHUTW_NOW)) == 0 && !channel_full(si->ob))
		si->flags |= SI_FL_WAIT_DATA;

	if (si->ob->flags & CF_WRITE_ACTIVITY) {
		/* update timeouts if we have written something */
		if ((si->ob->flags & (CF_SHUTW|CF_WRITE_PARTIAL)) == CF_WRITE_PARTIAL &&
		    !channel_is_empty(si->ob))
			if (tick_isset(si->ob->wex))
				si->ob->wex = tick_add_ifset(now_ms, si->ob->wto);

		if (!(si->flags & SI_FL_INDEP_STR))
			if (tick_isset(si->ib->rex))
				si->ib->rex = tick_add_ifset(now_ms, si->ib->rto);

		if (likely((si->ob->flags & (CF_SHUTW|CF_WRITE_PARTIAL|CF_DONT_READ)) == CF_WRITE_PARTIAL &&
			   !channel_full(si->ob) &&
			   (si->ob->prod->flags & SI_FL_WAIT_ROOM)))
			si_chk_rcv(si->ob->prod);
	}

	/* process producer side.
	 * We might have some data the consumer is waiting for.
	 * We can do fast-forwarding, but we avoid doing this for partial
	 * buffers, because it is very likely that it will be done again
	 * immediately afterwards once the following data is parsed (eg:
	 * HTTP chunking).
	 */
	if (((si->ib->flags & CF_READ_PARTIAL) && !channel_is_empty(si->ib)) &&
	    (si->ib->pipe /* always try to send spliced data */ ||
	     (si->ib->buf->i == 0 && (si->ib->cons->flags & SI_FL_WAIT_DATA)))) {
		int last_len = si->ib->pipe ? si->ib->pipe->data : 0;

		si_chk_snd(si->ib->cons);

		/* check if the consumer has freed some space either in the
		 * buffer or in the pipe.
		 */
		if (!channel_full(si->ib) &&
		    (!last_len || !si->ib->pipe || si->ib->pipe->data < last_len))
			si->flags &= ~SI_FL_WAIT_ROOM;
	}

	if (si->flags & SI_FL_WAIT_ROOM) {
		__conn_data_stop_recv(conn);
		si->ib->rex = TICK_ETERNITY;
	}
	else if ((si->ib->flags & (CF_SHUTR|CF_READ_PARTIAL|CF_DONT_READ)) == CF_READ_PARTIAL &&
		 !channel_full(si->ib)) {
		/* we must re-enable reading if si_chk_snd() has freed some space */
		__conn_data_want_recv(conn);
		if (!(si->ib->flags & CF_READ_NOEXP) && tick_isset(si->ib->rex))
			si->ib->rex = tick_add_ifset(now_ms, si->ib->rto);
	}

	/* wake the task up only when needed */
	if (/* changes on the production side */
	    (si->ib->flags & (CF_READ_NULL|CF_READ_ERROR)) ||
	    si->state != SI_ST_EST ||
	    (si->flags & SI_FL_ERR) ||
	    ((si->ib->flags & CF_READ_PARTIAL) &&
	     (!si->ib->to_forward || si->ib->cons->state != SI_ST_EST)) ||

	    /* changes on the consumption side */
	    (si->ob->flags & (CF_WRITE_NULL|CF_WRITE_ERROR)) ||
	    ((si->ob->flags & CF_WRITE_ACTIVITY) &&
	     ((si->ob->flags & CF_SHUTW) ||
	      ((si->ob->flags & CF_WAKE_WRITE) &&
	       (si->ob->prod->state != SI_ST_EST ||
	        (channel_is_empty(si->ob) && !si->ob->to_forward)))))) {
		task_wakeup(si->owner, TASK_WOKEN_IO);
	}
	if (si->ib->flags & CF_READ_ACTIVITY)
		si->ib->flags &= ~CF_READ_DONTWAIT;
	return 0;
}
Ejemplo n.º 8
0
/* default update function for embedded tasks, to be used at the end of the i/o handler */
static void stream_int_update_embedded(struct stream_interface *si)
{
	int old_flags = si->flags;

	DPRINTF(stderr, "%s: si=%p, si->state=%d ib->flags=%08x ob->flags=%08x\n",
		__FUNCTION__,
		si, si->state, si->ib->flags, si->ob->flags);

	if (si->state != SI_ST_EST)
		return;

	if ((si->ob->flags & (CF_SHUTW|CF_SHUTW_NOW)) == CF_SHUTW_NOW &&
	    channel_is_empty(si->ob))
		si_shutw(si);

	if ((si->ob->flags & (CF_SHUTW|CF_SHUTW_NOW)) == 0 && !channel_full(si->ob))
		si->flags |= SI_FL_WAIT_DATA;

	/* we're almost sure that we need some space if the buffer is not
	 * empty, even if it's not full, because the applets can't fill it.
	 */
	if ((si->ib->flags & (CF_SHUTR|CF_DONT_READ)) == 0 && !channel_is_empty(si->ib))
		si->flags |= SI_FL_WAIT_ROOM;

	if (si->ob->flags & CF_WRITE_ACTIVITY) {
		if (tick_isset(si->ob->wex))
			si->ob->wex = tick_add_ifset(now_ms, si->ob->wto);
	}

	if (si->ib->flags & CF_READ_ACTIVITY ||
	    (si->ob->flags & CF_WRITE_ACTIVITY && !(si->flags & SI_FL_INDEP_STR))) {
		if (tick_isset(si->ib->rex))
			si->ib->rex = tick_add_ifset(now_ms, si->ib->rto);
	}

	/* save flags to detect changes */
	old_flags = si->flags;
	if (likely((si->ob->flags & (CF_SHUTW|CF_WRITE_PARTIAL|CF_DONT_READ)) == CF_WRITE_PARTIAL &&
		   !channel_full(si->ob) &&
		   (si->ob->prod->flags & SI_FL_WAIT_ROOM)))
		si_chk_rcv(si->ob->prod);

	if (((si->ib->flags & CF_READ_PARTIAL) && !channel_is_empty(si->ib)) &&
	    (si->ib->cons->flags & SI_FL_WAIT_DATA)) {
		si_chk_snd(si->ib->cons);
		/* check if the consumer has freed some space */
		if (!channel_full(si->ib))
			si->flags &= ~SI_FL_WAIT_ROOM;
	}

	/* Note that we're trying to wake up in two conditions here :
	 *  - special event, which needs the holder task attention
	 *  - status indicating that the applet can go on working. This
	 *    is rather hard because we might be blocking on output and
	 *    don't want to wake up on input and vice-versa. The idea is
	 *    to only rely on the changes the chk_* might have performed.
	 */
	if (/* check stream interface changes */
	    ((old_flags & ~si->flags) & (SI_FL_WAIT_ROOM|SI_FL_WAIT_DATA)) ||

	    /* changes on the production side */
	    (si->ib->flags & (CF_READ_NULL|CF_READ_ERROR)) ||
	    si->state != SI_ST_EST ||
	    (si->flags & SI_FL_ERR) ||
	    ((si->ib->flags & CF_READ_PARTIAL) &&
	     (!si->ib->to_forward || si->ib->cons->state != SI_ST_EST)) ||

	    /* changes on the consumption side */
	    (si->ob->flags & (CF_WRITE_NULL|CF_WRITE_ERROR)) ||
	    ((si->ob->flags & CF_WRITE_ACTIVITY) &&
	     ((si->ob->flags & CF_SHUTW) ||
	      ((si->ob->flags & CF_WAKE_WRITE) &&
	       (si->ob->prod->state != SI_ST_EST ||
	        (channel_is_empty(si->ob) && !si->ob->to_forward)))))) {
		if (!(si->flags & SI_FL_DONT_WAKE) && si->owner)
			task_wakeup(si->owner, TASK_WOKEN_IO);
	}
	if (si->ib->flags & CF_READ_ACTIVITY)
		si->ib->flags &= ~CF_READ_DONTWAIT;
}
Ejemplo n.º 9
0
/*
 * This is the callback which is called by the connection layer to receive data
 * into the buffer from the connection. It iterates over the transport layer's
 * rcv_buf function.
 */
static void si_conn_recv_cb(struct connection *conn)
{
	struct stream_interface *si = conn->owner;
	struct channel *chn = si->ib;
	int ret, max, cur_read;
	int read_poll = MAX_READ_POLL_LOOPS;

	/* stop immediately on errors. Note that we DON'T want to stop on
	 * POLL_ERR, as the poller might report a write error while there
	 * are still data available in the recv buffer. This typically
	 * happens when we send too large a request to a backend server
	 * which rejects it before reading it all.
	 */
	if (conn->flags & CO_FL_ERROR)
		return;

	/* stop here if we reached the end of data */
	if (conn_data_read0_pending(conn))
		goto out_shutdown_r;

	/* maybe we were called immediately after an asynchronous shutr */
	if (chn->flags & CF_SHUTR)
		return;

	cur_read = 0;

	if ((chn->flags & (CF_STREAMER | CF_STREAMER_FAST)) && !chn->buf->o &&
	    global.tune.idle_timer &&
	    (unsigned short)(now_ms - chn->last_read) >= global.tune.idle_timer) {
		/* The buffer was empty and nothing was transferred for more
		 * than one second. This was caused by a pause and not by
		 * congestion. Reset any streaming mode to reduce latency.
		 */
		chn->xfer_small = 0;
		chn->xfer_large = 0;
		chn->flags &= ~(CF_STREAMER | CF_STREAMER_FAST);
	}

	/* First, let's see if we may splice data across the channel without
	 * using a buffer.
	 */
	if (conn->xprt->rcv_pipe &&
	    (chn->pipe || chn->to_forward >= MIN_SPLICE_FORWARD) &&
	    chn->flags & CF_KERN_SPLICING) {
		if (buffer_not_empty(chn->buf)) {
			/* We're embarrassed, there are already data pending in
			 * the buffer and we don't want to have them at two
			 * locations at a time. Let's indicate we need some
			 * place and ask the consumer to hurry.
			 */
			goto abort_splice;
		}

		if (unlikely(chn->pipe == NULL)) {
			if (pipes_used >= global.maxpipes || !(chn->pipe = get_pipe())) {
				chn->flags &= ~CF_KERN_SPLICING;
				goto abort_splice;
			}
		}

		ret = conn->xprt->rcv_pipe(conn, chn->pipe, chn->to_forward);
		if (ret < 0) {
			/* splice not supported on this end, let's disable it */
			chn->flags &= ~CF_KERN_SPLICING;
			goto abort_splice;
		}

		if (ret > 0) {
			if (chn->to_forward != CHN_INFINITE_FORWARD)
				chn->to_forward -= ret;
			chn->total += ret;
			cur_read += ret;
			chn->flags |= CF_READ_PARTIAL;
		}

		if (conn_data_read0_pending(conn))
			goto out_shutdown_r;

		if (conn->flags & CO_FL_ERROR)
			return;

		if (conn->flags & CO_FL_WAIT_ROOM) {
			/* the pipe is full or we have read enough data that it
			 * could soon be full. Let's stop before needing to poll.
			 */
			si->flags |= SI_FL_WAIT_ROOM;
			__conn_data_stop_recv(conn);
		}

		/* splice not possible (anymore), let's go on on standard copy */
	}

 abort_splice:
	if (chn->pipe && unlikely(!chn->pipe->data)) {
		put_pipe(chn->pipe);
		chn->pipe = NULL;
	}

	/* Important note : if we're called with POLL_IN|POLL_HUP, it means the read polling
	 * was enabled, which implies that the recv buffer was not full. So we have a guarantee
	 * that if such an event is not handled above in splice, it will be handled here by
	 * recv().
	 */
	while (!(conn->flags & (CO_FL_ERROR | CO_FL_SOCK_RD_SH | CO_FL_DATA_RD_SH | CO_FL_WAIT_ROOM | CO_FL_HANDSHAKE))) {
		max = bi_avail(chn);

		if (!max) {
			si->flags |= SI_FL_WAIT_ROOM;
			break;
		}

		ret = conn->xprt->rcv_buf(conn, chn->buf, max);
		if (ret <= 0)
			break;

		cur_read += ret;

		/* if we're allowed to directly forward data, we must update ->o */
		if (chn->to_forward && !(chn->flags & (CF_SHUTW|CF_SHUTW_NOW))) {
			unsigned long fwd = ret;
			if (chn->to_forward != CHN_INFINITE_FORWARD) {
				if (fwd > chn->to_forward)
					fwd = chn->to_forward;
				chn->to_forward -= fwd;
			}
			b_adv(chn->buf, fwd);
		}

		chn->flags |= CF_READ_PARTIAL;
		chn->total += ret;

		if (channel_full(chn)) {
			si->flags |= SI_FL_WAIT_ROOM;
			break;
		}

		if ((chn->flags & CF_READ_DONTWAIT) || --read_poll <= 0) {
			si->flags |= SI_FL_WAIT_ROOM;
			__conn_data_stop_recv(conn);
			break;
		}

		/* if too many bytes were missing from last read, it means that
		 * it's pointless trying to read again because the system does
		 * not have them in buffers.
		 */
		if (ret < max) {
			/* if a streamer has read few data, it may be because we
			 * have exhausted system buffers. It's not worth trying
			 * again.
			 */
			if (chn->flags & CF_STREAMER)
				break;

			/* if we read a large block smaller than what we requested,
			 * it's almost certain we'll never get anything more.
			 */
			if (ret >= global.tune.recv_enough)
				break;
		}
	} /* while !flags */

	if (conn->flags & CO_FL_ERROR)
		return;

	if (cur_read) {
		if ((chn->flags & (CF_STREAMER | CF_STREAMER_FAST)) &&
		    (cur_read <= chn->buf->size / 2)) {
			chn->xfer_large = 0;
			chn->xfer_small++;
			if (chn->xfer_small >= 3) {
				/* we have read less than half of the buffer in
				 * one pass, and this happened at least 3 times.
				 * This is definitely not a streamer.
				 */
				chn->flags &= ~(CF_STREAMER | CF_STREAMER_FAST);
			}
			else if (chn->xfer_small >= 2) {
				/* if the buffer has been at least half full twice,
				 * we receive faster than we send, so at least it
				 * is not a "fast streamer".
				 */
				chn->flags &= ~CF_STREAMER_FAST;
			}
		}
		else if (!(chn->flags & CF_STREAMER_FAST) &&
			 (cur_read >= chn->buf->size - global.tune.maxrewrite)) {
			/* we read a full buffer at once */
			chn->xfer_small = 0;
			chn->xfer_large++;
			if (chn->xfer_large >= 3) {
				/* we call this buffer a fast streamer if it manages
				 * to be filled in one call 3 consecutive times.
				 */
				chn->flags |= (CF_STREAMER | CF_STREAMER_FAST);
			}
		}
		else {
			chn->xfer_small = 0;
			chn->xfer_large = 0;
		}
		chn->last_read = now_ms;
	}

	if (conn_data_read0_pending(conn))
		/* connection closed */
		goto out_shutdown_r;

	return;

 out_shutdown_r:
	/* we received a shutdown */
	chn->flags |= CF_READ_NULL;
	if (chn->flags & CF_AUTO_CLOSE)
		channel_shutw_now(chn);
	stream_sock_read0(si);
	conn_data_read0(conn);
	return;
}