xCAT/xNBA
2
0
Fork 0
mirror of https://github.com/xcat2/xNBA.git synced 2024-11-26 19:29:04 +00:00
Code Issues Projects Releases Wiki Activity

Added tcp_buffer, to give applications a zero-cost place to build data to

Browse Source 
be transmitted.
This commit is contained in:
Michael Brown 2006-04-05 11:43:01 +00:00
parent 988bb50979
commit c8a7133e9f
2 changed files with 40 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
src/include/gpxe/tcp.h
View File

@ -92,6 +92,8 @@ struct tcp_connection {
struct tcp_operations *tcp_op;
};
extern void *tcp_buffer;
extern size_t tcp_buflen;
extern int tcp_connect ( struct tcp_connection *conn );
extern void tcp_send ( struct tcp_connection *conn, const void *data,
size_t len );

40
src/proto/tcp.c
View File

@ -24,6 +24,36 @@
*
*/
/**
* TCP transmit buffer
*
* When a tcp_operations::senddata() method is called, it is
* guaranteed to be able to use this buffer as temporary space for
* constructing the data to be sent. For example, code such as
*
* @code
*
* static void my_senddata ( struct tcp_connection *conn ) {
* int len;
*
* len = snprintf ( tcp_buffer, tcp_buflen, "FETCH %s\r\n", filename );
* tcp_send ( conn, tcp_buffer + already_sent, len - already_sent );
* }
*
* @endcode
*
* is allowed, and is probably the best way to deal with
* variably-sized data.
*
* Note that you cannot use this simple mechanism if you want to be
* able to construct single data blocks of more than #tcp_buflen
* bytes.
*/
void *tcp_buffer = uip_buf + ( 40 + UIP_LLH_LEN );
/** Size of #tcp_buffer */
size_t tcp_buflen = UIP_BUFSIZE - ( 40 + UIP_LLH_LEN );
/**
* Open a TCP connection
*
@ -67,13 +97,19 @@ int tcp_connect ( struct tcp_connection *conn ) {
* Data will be automatically limited to the current TCP window size.
*
* If retransmission is required, the connection's
* tcp_operations::newdata() method will be called again in order to
* tcp_operations::senddata() method will be called again in order to
* regenerate the data.
*/
void tcp_send ( struct tcp_connection *conn __unused,
const void *data, size_t len ) {
assert ( conn = *( ( void ** ) uip_conn->appstate ) );
uip_send ( ( void * ) data, len );
if ( len > tcp_buflen )
len = tcp_buflen;
memmove ( tcp_buffer, data, len );
uip_send ( tcp_buffer, len );
}
/**