MEDIUM: mux: make mux->snd_buf() take the byte count in argument
This way the mux doesn't need to modify the buffer's metadata anymore
nor to know the output's size. The mux->snd_buf() function now takes a
const buffer and it's up to the caller to update the buffer's state.
The return type was updated to return a size_t to comply with the count
argument.
diff --git a/include/types/connection.h b/include/types/connection.h
index 6cd8a3a..f9757e5 100644
--- a/include/types/connection.h
+++ b/include/types/connection.h
@@ -298,7 +298,7 @@
int (*wake)(struct connection *conn); /* mux-layer callback to report activity, mandatory */
void (*update_poll)(struct conn_stream *cs); /* commit cs flags to mux/conn */
int (*rcv_buf)(struct conn_stream *cs, struct buffer *buf, int count); /* Called from the upper layer to get data */
- int (*snd_buf)(struct conn_stream *cs, struct buffer *buf, int flags); /* Called from the upper layer to send data */
+ size_t (*snd_buf)(struct conn_stream *cs, const struct buffer *buf, size_t count, int flags); /* Called from the upper layer to send data */
int (*rcv_pipe)(struct conn_stream *cs, struct pipe *pipe, unsigned int count); /* recv-to-pipe callback */
int (*snd_pipe)(struct conn_stream *cs, struct pipe *pipe); /* send-to-pipe callback */
void (*shutr)(struct conn_stream *cs, enum cs_shr_mode); /* shutr function */