select()
- Implemented using a wait queue for every file descriptor
- That requires waiting on sockets to be centeralised

All wait tasks (reads on VTerm, Pipes, PTYs, network sockets) use the kernel
version of select with an inifinite timeout.
They then signal the VFS using their VFS node pointer as a reference

The VFS function select()
- Maintains a list of processes on each node (if select has been called on that node)
- Each process maybe has a semaphore on it (to use the semaphore code to maintain the process list)
 > Could maybe use a mutex instead


VFS_Select(int, fd_set* read, fd_set* write, fd_set* except)

read is the set of sockets that we are waiting to read from
write         "           "           "           be able to write to
except        "           "           "        for possible errors on


Hence, each VFS_Node has three listener lists (or just pointers)
- One for when data is avaliable
- One for when space is avaliable for writing
- One for when an error occurs (closed pipe, etc ...)