Support setting send/receive buffers for the IP sockets

protocol/common.go

@@ -8,6 +8,8 @@ import (
 	"io"
 	"log"
 	"net"
+	"os"
+	"syscall"
 )
 
 type RedirectFlags struct {
@@ -136,3 +138,11 @@ func receive(data []byte, out net.Conn) {
 	out.Write(pkt)
 }
 
+// wrapSyscallError takes an error and a syscall name. If the error is
+// a syscall.Errno, it wraps it in a os.SyscallError using the syscall name.
+func wrapSyscallError(name string, err error) error {
+	if _, ok := err.(syscall.Errno); ok {
+		err = os.NewSyscallError(name, err)
+	}
+	return err
+}