initial thing works. needs tests.

impl_unix.go

@@ -0,0 +1,154 @@
+// +build darwin freebsd dragonfly netbsd openbsd linux
+
+package reuseport
+
+import (
+	"fmt"
+	"net"
+	"os"
+	"strconv"
+	"syscall"
+
+	resolve "github.com/jbenet/go-net-resolve-addr"
+	sockaddrnet "github.com/jbenet/go-sockaddr/net"
+)
+
+const (
+	tcp4       = 52 // "4"
+	tcp6       = 54 // "6"
+	filePrefix = "port."
+)
+
+func dial(dialer net.Dialer, netw, addr string) (c net.Conn, err error) {
+	var (
+		family, fd     int
+		file           *os.File
+		remoteSockaddr syscall.Sockaddr
+		localSockaddr  syscall.Sockaddr
+	)
+
+	netAddr, err := resolve.ResolveAddr("dial", netw, addr)
+	if err != nil {
+		fmt.Println("resolve addr failed")
+		return nil, err
+	}
+	fmt.Println("resolve addr ok")
+
+	switch netAddr.(type) {
+	case *net.TCPAddr, *net.UDPAddr:
+	default:
+		return nil, ErrUnsupportedProtocol
+	}
+
+	switch dialer.LocalAddr.(type) {
+	case *net.TCPAddr, *net.UDPAddr:
+	default:
+		return nil, ErrUnsupportedProtocol
+	}
+
+	family = sockaddrnet.NetAddrAF(netAddr)
+	localSockaddr = sockaddrnet.NetAddrToSockaddr(dialer.LocalAddr)
+	remoteSockaddr = sockaddrnet.NetAddrToSockaddr(netAddr)
+
+	if fd, err = syscall.Socket(family, syscall.SOCK_STREAM, syscall.IPPROTO_TCP); err != nil {
+		fmt.Println("tcp socket failed")
+		return nil, err
+	}
+
+	if err = syscall.SetsockoptInt(fd, syscall.SOL_SOCKET, soReuseAddr, 1); err != nil {
+		fmt.Println("reuse addr failed")
+		return nil, err
+	}
+
+	if err = syscall.SetsockoptInt(fd, syscall.SOL_SOCKET, soReusePort, 1); err != nil {
+		fmt.Println("reuse port failed")
+		return nil, err
+	}
+
+	if localSockaddr != nil {
+		if err = syscall.Bind(fd, localSockaddr); err != nil {
+			fmt.Println("bind failed")
+			return nil, err
+		}
+	}
+
+	// Set backlog size to the maximum
+	if err = syscall.Connect(fd, remoteSockaddr); err != nil {
+		fmt.Println("connect failed")
+		return nil, err
+	}
+
+	// File Name get be nil
+	file = os.NewFile(uintptr(fd), filePrefix+strconv.Itoa(os.Getpid()))
+	if c, err = net.FileConn(file); err != nil {
+		return nil, err
+	}
+
+	if err = file.Close(); err != nil {
+		return nil, err
+	}
+
+	return c, err
+}
+
+func listen(netw, addr string) (l net.Listener, err error) {
+	var (
+		family, fd int
+		file       *os.File
+		sockaddr   syscall.Sockaddr
+	)
+
+	netAddr, err := resolve.ResolveAddr("listen", netw, addr)
+	if err != nil {
+		fmt.Println("resolve addr failed")
+		return nil, err
+	}
+	fmt.Println("resolve addr ok")
+
+	switch netAddr.(type) {
+	case *net.TCPAddr, *net.UDPAddr:
+	default:
+		return nil, ErrUnsupportedProtocol
+	}
+
+	family = sockaddrnet.NetAddrAF(netAddr)
+	sockaddr = sockaddrnet.NetAddrToSockaddr(netAddr)
+
+	if fd, err = syscall.Socket(family, syscall.SOCK_STREAM, syscall.IPPROTO_TCP); err != nil {
+		fmt.Println("socket failed")
+		return nil, err
+	}
+
+	if err = syscall.SetsockoptInt(fd, syscall.SOL_SOCKET, soReusePort, 1); err != nil {
+		fmt.Println("setsockopt reuseport failed")
+		return nil, err
+	}
+
+	if err = syscall.SetsockoptInt(fd, syscall.SOL_SOCKET, soReuseAddr, 1); err != nil {
+		fmt.Println("setsockopt reuseaddr failed")
+		return nil, err
+	}
+
+	if err = syscall.Bind(fd, sockaddr); err != nil {
+		fmt.Println("bind failed")
+		return nil, err
+	}
+
+	// Set backlog size to the maximum
+	if err = syscall.Listen(fd, syscall.SOMAXCONN); err != nil {
+		fmt.Println("listen failed")
+		return nil, err
+	}
+
+	// File Name get be nil
+	file = os.NewFile(uintptr(fd), filePrefix+strconv.Itoa(os.Getpid()))
+	if l, err = net.FileListener(file); err != nil {
+		return nil, err
+	}
+
+	if err = file.Close(); err != nil {
+		return nil, err
+	}
+
+	return l, err
+}