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Preliminary support for opening data-transfer interfaces

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This commit is contained in:
Michael Brown
2007-04-28 20:56:24 +00:00
parent 27b3bd10c9
commit ff1222a8d3
4 changed files with 325 additions and 18 deletions
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76
src/core/xfer.c
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@@ -26,6 +26,38 @@
*
*/
/**
* Send redirection event
*
* @v xfer Data-transfer interface
* @v type New location type
* @v args Remaining arguments depend upon location type
* @ret rc Return status code
*/
int vredirect ( struct xfer_interface *xfer, int type, va_list args ) {
struct xfer_interface *dest = xfer_dest ( xfer );
return dest->op->vredirect ( dest, type, args );
}
/**
* Send redirection event
*
* @v xfer Data-transfer interface
* @v type New location type
* @v ... Remaining arguments depend upon location type
* @ret rc Return status code
*/
int redirect ( struct xfer_interface *xfer, int type, ... ) {
va_list args;
int rc;
va_start ( args, type );
rc = vredirect ( xfer, type, args );
va_end ( args );
return rc;
}
/**
* Deliver datagram
*
@@ -36,14 +68,35 @@
int deliver ( struct xfer_interface *xfer, struct io_buffer *iobuf ) {
struct xfer_interface *dest = xfer_dest ( xfer );
return dest->op->deliver ( dest, xfer, iobuf );
return dest->op->deliver ( dest, iobuf );
}
/**
* Deliver datagram as raw data
*
* @v xfer Data-transfer interface
* @v src Source interface
* @v iobuf Datagram I/O buffer
* @ret rc Return status code
*/
int deliver_raw ( struct xfer_interface *xfer, const void *data, size_t len ) {
struct xfer_interface *dest = xfer_dest ( xfer );
return dest->op->deliver_raw ( dest, data, len );
}
/****************************************************************************
*
* Helper methods
*
* These functions are designed to be used as methods in the
* xfer_interface_operations table.
*
*/
/**
* Deliver datagram as raw data
*
* @v xfer Data-transfer interface
* @v iobuf Datagram I/O buffer
* @ret rc Return status code
*
@@ -51,12 +104,10 @@ int deliver ( struct xfer_interface *xfer, struct io_buffer *iobuf ) {
* data transfer interfaces that prefer to handle raw data.
*/
int deliver_as_raw ( struct xfer_interface *xfer,
struct xfer_interface *src,
struct io_buffer *iobuf ) {
int rc;
rc = xfer->op->deliver_raw ( xfer, src, iobuf->data,
iob_len ( iobuf ) );
rc = xfer->op->deliver_raw ( xfer, iobuf->data, iob_len ( iobuf ) );
free_iob ( iobuf );
return rc;
}
@@ -65,7 +116,6 @@ int deliver_as_raw ( struct xfer_interface *xfer,
* Deliver datagram as I/O buffer
*
* @v xfer Data-transfer interface
* @v src Source interface
* @v data Data buffer
* @v len Length of data buffer
* @ret rc Return status code
@@ -74,32 +124,34 @@ int deliver_as_raw ( struct xfer_interface *xfer,
* for data transfer interfaces that prefer to handle I/O buffers.
*/
int deliver_as_iobuf ( struct xfer_interface *xfer,
struct xfer_interface *src,
const void *data, size_t len ) {
struct io_buffer *iobuf;
#warning "Do we need interface-specific I/O buffer allocation?"
iobuf = alloc_iob ( len );
if ( ! iobuf )
return -ENOMEM;
memcpy ( iob_put ( iobuf, len ), data, len );
return xfer->op->deliver ( xfer, src, iobuf );
return xfer->op->deliver ( xfer, iobuf );
}
/****************************************************************************
*
* Null data transfer interface
*
*/
/**
* Null deliver datagram as raw data
*
* @v xfer Data-transfer interface
* @v src Source interface
* @v data Data buffer
* @v len Length of data buffer
* @ret rc Return status code
*/
static int null_deliver_raw ( struct xfer_interface *xfer,
struct xfer_interface *src,
const void *data __unused, size_t len ) {
DBGC ( src, "XFER %p->%p %zd bytes delivered %s\n", src, xfer, len,
DBGC ( xfer, "XFER %p %zd bytes delivered %s\n", xfer, len,
( ( xfer == &null_xfer ) ?
"before connection" : "after termination" ) );
return -EPIPE;