Add missing files

Author: brutella

readwritecloser_darwin.go

@@ -0,0 +1,10 @@
+package can
+
+import (
+	"fmt"
+	"net"
+)
+
+func NewReadWriteCloserForInterface(i *net.Interface) (ReadWriteCloser, error) {
+	return nil, fmt.Errorf("Binding to can interface no supported on Darwin")
+}

readwritecloser_linux.go

@@ -0,0 +1,21 @@
+package can
+
+import (
+	"fmt"
+	"golang.org/x/sys/unix"
+	"net"
+	"os"
+	"syscall"
+)
+
+func NewReadWriteCloserForInterface(i *net.Interface) (ReadWriteCloser, error) {
+	s, _ := syscall.Socket(syscall.AF_CAN, syscall.SOCK_RAW, unix.CAN_RAW)
+	addr := &unix.SockaddrCAN{Ifindex: i.Index}
+	if err := unix.Bind(s, addr); err != nil {
+		return nil, err
+	}
+
+	f := os.NewFile(uintptr(s), fmt.Sprintf("fd %d", s))
+
+	return &readWriteCloser{f}, nil
+}