Low-overhead UDP Functions

6.1.5udp_send()

This function sends a UDP datagram to the foreign host in pkt->fhost. Local and remote ports in the UDP header are set from the values passed.

Syntax

int udp_send(unsigned short fport,

Return value

Returns one of the following:

ENP_Code If not successful (see ENP_ error codes on page A-2).

Low-overhead UDP Functions

6.1.6udp_socket()

This function is used to obtain a random port number that is suitable for use as the lport parameter in a call to udp_open(). The udp_socket() function avoids picking port numbers in the reserved range 0-1024, or in the range 1025-1199, which may be used for server applications.

Syntax

int udp_socket(void)

Return value

Returns a UDP port number. This number is the lport parameter that is suitable for passing to udp_open().

Low-overhead UDP Functions

Chapter 7

The TCP Zero-copy API

This chapter describes the TCP Zero-copy API, an optional extension to the Sockets layer. It contains the following sections:

•About the TCP Zero-copy API on page 7-2

•Sending data with the TCP Zero-copy API on page 7-4

•Receiving data with the TCP Zero-copy API on page 7-6

•TCP Zero-copy API reference on page 7-8.