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Separate the "is data ready" function of xfer_seek() into an

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xfer_window() function, which can return a scalar rather than a
boolean.
This commit is contained in:
Michael Brown
2007-07-08 14:11:07 +01:00
parent ca4c6f9eee
commit b34d4d0449
14 changed files with 94 additions and 45 deletions
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28
src/net/tcp.c
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@@ -897,31 +897,28 @@ static void tcp_xfer_close ( struct xfer_interface *xfer, int rc ) {
}
/**
* Seek to position
* Check flow control window
*
* @v xfer Data transfer interface
* @v offset Offset to new position
* @v whence Basis for new position
* @ret rc Return status code
* @ret len Length of window
*/
static int tcp_xfer_seek ( struct xfer_interface *xfer, off_t offset,
int whence ) {
static size_t tcp_xfer_window ( struct xfer_interface *xfer ) {
struct tcp_connection *tcp =
container_of ( xfer, struct tcp_connection, xfer );
/* TCP doesn't support seeking to arbitrary positions */
if ( ( whence != SEEK_CUR ) || ( offset != 0 ) )
return -EINVAL;
/* Not ready if we're not in a suitable connection state */
if ( ! TCP_CAN_SEND_DATA ( tcp->tcp_state ) )
return -EAGAIN;
return 0;
/* Not ready if data queue is non-empty */
/* Not ready if data queue is non-empty. This imposes a limit
* of only one unACKed packet in the TX queue at any time; we
* do this to conserve memory usage.
*/
if ( ! list_empty ( &tcp->queue ) )
return -EAGAIN;
return 0;
return 0;
/* Return TCP window length */
return tcp->snd_win;
}
/**
@@ -951,7 +948,8 @@ static int tcp_xfer_deliver_iob ( struct xfer_interface *xfer,
static struct xfer_interface_operations tcp_xfer_operations = {
.close = tcp_xfer_close,
.vredirect = ignore_xfer_vredirect,
.seek = tcp_xfer_seek,
.seek = ignore_xfer_seek,
.window = tcp_xfer_window,
.alloc_iob = default_xfer_alloc_iob,
.deliver_iob = tcp_xfer_deliver_iob,
.deliver_raw = xfer_deliver_as_iob,