X-Git-Url: http://git.archive.openwrt.org/?p=project%2Flibubox.git;a=blobdiff_plain;f=ustream.h;h=6431744155f810f5c8d2b8d3a4b57c47de60e490;hp=0ec2ac313bd12ed1d6a1d842aa02dc3623d2cdd8;hb=13b5c1d4ca488575ee3dd4726b669f768fad8ffa;hpb=ba6cd4c3222c90a0bb583afbcba335d36ceb8418

diff --git a/ustream.h b/ustream.h
index 0ec2ac3..6431744 100644
--- a/ustream.h
+++ b/ustream.h
@@ -49,9 +49,10 @@ struct ustream_buf_list {
 struct ustream {
 	struct ustream_buf_list r, w;
 	struct uloop_timeout state_change;
+	struct ustream *next;
 
 	/*
-	 * notify_read:
+	 * notify_read: (optional)
 	 * called by the ustream core to notify that new data is available
 	 * for reading.
 	 * must not free the ustream from this callback
@@ -67,7 +68,7 @@ struct ustream {
 	void (*notify_write)(struct ustream *s, int bytes);
 
 	/*
-	 * notify_state:
+	 * notify_state: (optional)
 	 * called by the ustream implementation to notify that the read
 	 * side of the stream is closed (eof is set) or there was a write
 	 * error (write_error is set).
@@ -100,6 +101,14 @@ struct ustream {
 	void (*set_read_blocked)(struct ustream *s);
 
 	/*
+	 * poll: (optional)
+	 * defined by the upstream implementation, called to request polling for
+	 * available data.
+	 * returns true if data was fetched.
+	 */
+	bool (*poll)(struct ustream *s);
+
+	/*
 	 * ustream user should set this if the input stream is expected
 	 * to contain string data. the core will keep all data 0-terminated.
 	 */
@@ -154,6 +163,19 @@ static inline bool ustream_read_blocked(struct ustream *s)
 	return !!(s->read_blocked & READ_BLOCKED_USER);
 }
 
+static inline int ustream_pending_data(struct ustream *s, bool write)
+{
+	struct ustream_buf_list *b = write ? &s->w : &s->r;
+	return b->data_bytes;
+}
+
+static inline bool ustream_read_buf_full(struct ustream *s)
+{
+	struct ustream_buf *buf = s->r.data_tail;
+	return buf && buf->data == buf->head && buf->tail == buf->end &&
+	       s->r.buffers == s->r.max_buffers;
+}
+
 /*** --- functions only used by ustream implementations --- ***/
 
 /* ustream_init_defaults: fill default callbacks and options */
@@ -181,4 +203,12 @@ static inline void ustream_state_change(struct ustream *s)
 	uloop_timeout_set(&s->state_change, 0);
 }
 
+static inline bool ustream_poll(struct ustream *s)
+{
+	if (!s->poll)
+		return false;
+
+	return s->poll(s);
+}
+
 #endif