Unix Abstractions on Xok

Xok maintains a shared table for processes.

fork() works by making a copy of the current address space (using copy-on-write semantics). A little tricky because the address space is of the process currently executing.

IPC:

• signals on top of Xok IPC

• pipes using software regions and a "directed yield"

• sockets using a shared buffer

• inter-machine IPC using user-level libraries

Global shared table for file descriptors.

Need shared libraries for performance.