STREAM_MMAP
swap_required = !(cur_streamp->s_status & STREAM_MMAP);
if (cur_stream->s_status & STREAM_MMAP) {
if (!(cur_stream->s_status & STREAM_MMAP)) {
stream_set(str, STREAM_MMAP | STREAM_OPEN);
(flags & STREAM_SOURCE_MASK) == STREAM_MMAP ||
case STREAM_MMAP: