serviceType methodLen method requestLen request |___1byte__|_______4byte______|_________|_______4byte_____|__________| */.

Receive data with size prefix.

Send sends data to a conn.

SysCtlRead reads value from /proc/sys/${item}.

SysCtlWrite writes a value to /proc/sys/${item}.

WithSizePrefix packs v with prefix of data size.

WriteBinary writes value to bytes.

Source returns a value to set a struct field.

Target use value v to set the item from which the Source get.