Merge branch 'connect' into 'master'

Add AF_UNSPEC support to the netstack

See merge request redox-os/relibc!1159

src/platform/redox/socket.rs

@@ -69,6 +69,16 @@ unsafe fn bind_or_connect(
             log::warn!("bind/connect with AF_UNIX were replaced with SYS_CALL.");
             return Err(Errno(EAFNOSUPPORT));
         }
+        AF_UNSPEC => match op {
+            SocketCall::Bind => {
+                //bind is not a valid socket call for AF_UNSPEC
+                return Err(Errno(EAFNOSUPPORT));
+            }
+            SocketCall::Connect => {
+                "0.0.0.0:0".to_string()
+            }
+            _ => unreachable!(),
+        }
         _ => return Err(Errno(EAFNOSUPPORT)),
     };
     let fd = syscall::dup(socket as usize, path.as_bytes())?;
@@ -667,6 +677,9 @@ impl PalSocket for Sys {
                 )?;
                 Result::<c_int, Errno>::Ok(0)
             }
+            AF_UNSPEC => unsafe {
+                bind_or_connect_into(SocketCall::Connect, socket, address, address_len)
+            }
             _ => Err(Errno(EAFNOSUPPORT)),
         }
     }