Socket Programming

Programming for T/TCP is slightly different using socket programming.

As an example, the chain of system calls to implement a TCP client would be as follows:

• socket() - create a socket
• connect() - connect to the remote host
• write() - write data to the remote host
• shutdown() - close one side of the connection

Whereas with T/TCP the chain of commands would be:

• socket() - create a socket
• sendto() - connect, send data, and close connection

The sendto() function has to be able to use a new flag MSG_EOF, to indicate to the kernel that it has no more data to send on this connection. This is the transaction processing coming into effect.

The kernel must also be modified to recognise this flag.