RPC: beyond socket()and sendto()

References: handouts, Stevens ch. 18
- also RFCs 1014 and 1057
Many different implementations
- we’ll concentrate on Sun’s: RPC/XDR (“external data representation”)
occupies layers 5 (session- RPC) and 6 (presentation- XDR) of the OSI model
- you (the programmer) at level 7 (application) never make socket library calls
- instead, you make RPC and XDR calls
NFS is based on RPC