Reads what is there, up to buffer.count bytes, waiting for at least one: 0 means the end.
Read_Proc :: #type (data: *void, buffer: [] u8) -> s64, Io_ErrorReads what is there, up to buffer.count bytes, waiting for at least one: 0 means the end.
Read_Proc :: #type (data: *void, buffer: [] u8) -> s64, Io_Error