The 9P protocol is the protocol for network file systems used in Plan9. Plan9 is not a widely used operating system, but it’s widely considered more true to the Unix spirit than Unix is, coming from some of the same people who made Unix as well. Overview To get a rough idea of the 9P protocol, consider a system where all the original core Unix syscalls (open, close, read, write, …) are lifted to be remote procedure calls. These can be sent over the network, making file systems in Plan9 ne...
