Re: [PATCH] read_index_from: remove bogus errno assignments

Nguyễn Thái Ngọc Duy [off-list ref] writes:

While at it, move die_errno() next to xmmap() call because it's the
mmap's error code that we care about. Otherwise if close(fd); fails,
it could overwrite mmap's errno.

Makes sense and is a sensible fix.

Thanks.