Optimization, no functional change:

Save a cookie pointing to the very first entry in the DIR.dd_buf
cache buffer and use that to speed up seekdir(3) when rewinding
to that first entry.
No libc bump because DIR is an opaque struct.

When the optimization applies, which in particular it always does
for rewinddir(3) after reading less than about 500 entries,
seekdir(3) execution time drops from 100 to 0.05 milliseconds
on my i386 notebook.  Other cases are not slowed down.

Based on an idea from and ok by guenther@.

0 files changed, 0 insertions, 0 deletions