Redo networking (#22)

* Rewriting network functions

* Add buffer to dup
Fix non-blocking handling by triggering once on enabling events to read to EOF

* Modifications for UDP API

* Implement TCP client side

* Add active close

* Add DMAR parser

* Implement basic TCP listening. Need to improve the state machine

* Reduce debugging

* Fixes for close procedure

* Updates to fix path processing in libstd

drivers/vesad/src/main.rs

@@ -63,7 +63,6 @@ fn main() {
             loop {
                 let mut packet = Packet::default();
                 socket.read(&mut packet).expect("vesad: failed to read display scheme");
-                //println!("vesad: {:?}", packet);
 
                 // If it is a read packet, and there is no data, block it. Otherwise, handle packet
                 if packet.a == syscall::number::SYS_READ && packet.d > 0 && scheme.will_block(packet.b) {

drivers/vesad/src/scheme.rs

@@ -60,7 +60,7 @@ impl SchemeMut for DisplayScheme {
         }
     }
 
-    fn dup(&mut self, id: usize) -> Result<usize> {
+    fn dup(&mut self, id: usize, _buf: &[u8]) -> Result<usize> {
         Ok(id)
     }