vlib/net: add buffered IO, x.net -> net (#6754)

vlib/net/aasocket.c.v

@@ -0,0 +1,100 @@
+module net
+
+// Select represents a select operation
+enum Select {
+	read write except
+}
+
+// SocketType are the available sockets
+pub enum SocketType {
+	udp = C.SOCK_DGRAM
+	tcp = C.SOCK_STREAM
+}
+
+// SocketFamily are the available address families
+pub enum SocketFamily {
+	inet = C. AF_INET
+}
+
+struct C.in_addr {
+mut:
+	s_addr int
+}
+
+struct C.sockaddr {
+	sa_family u16
+}
+
+struct C.sockaddr_in {
+mut:
+	sin_family int
+	sin_port   int
+	sin_addr   C.in_addr
+}
+
+
+struct C.addrinfo {
+mut:
+	ai_family    int
+	ai_socktype  int
+	ai_flags     int
+	ai_protocol  int
+	ai_addrlen   int
+	ai_addr      voidptr
+	ai_canonname voidptr
+	ai_next      voidptr
+}
+
+struct C.sockaddr_storage {
+}
+
+fn C.socket() int
+
+fn C.setsockopt() int
+
+fn C.htonl() int
+
+fn C.htons() int
+
+fn C.bind() int
+
+fn C.listen() int
+
+fn C.accept() int
+
+fn C.getaddrinfo() int
+
+fn C.connect() int
+
+fn C.send() int
+fn C.sendto() int
+
+fn C.recv() int
+fn C.recvfrom() int
+
+fn C.shutdown() int
+
+fn C.ntohs() int
+
+fn C.getpeername() int
+
+fn C.inet_ntop(af int, src voidptr, dst charptr, dst_size int) charptr
+
+fn C.WSAAddressToStringA() int
+
+fn C.getsockname() int
+
+// defined in builtin
+// fn C.read() int
+// fn C.close() int
+
+fn C.ioctlsocket() int
+fn C.fcntl() int
+
+fn C.@select() int
+fn C.FD_ZERO()
+fn C.FD_SET()
+fn C.FD_ISSET() bool
+
+[typedef]
+pub struct C.fd_set {}