ldconfig stuff

[Ulrich Drepper <drepper at redhat dot com>]

I was looking (admittedly the first time) closely at the ldconfig
code.  There are a few things which I do not really like:

- in search dir, whenever a directory is seen it is immediately processed.
  This is semantically not necessary and not beneficial for the performance.
  The directories should be queued and then processed once the current
  directory is done.

- the use of chroot seems unnecessary.  We know when ldconfig uses a filename
  whether it has to be interpreted with the prefix or not.  chroot() is
  quite nice but has the problems of not being available everywhere and
  also requiring the use of ldconfig by root (which hits me personally since
  installing in my chroot() test environment should work without being root).

It would be nice if somebody could look into this.


I've already added some code in ldconfig to make more use of d_type
information.  Please take a look at the change since this kind of use
is repeating in many places.  This little change reduced the number of
syscals made by a ldconfig run in my minimal chroot() environment from
629 to 543.

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