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Re: libio mmap changes

From: Roland McGrath <roland at frob dot com>
To: Ulrich Drepper <drepper at redhat dot com>
Cc: GNU libc hackers <libc-hacker at sources dot redhat dot com>
Date: Thu, 1 Aug 2002 22:14:37 -0400 (EDT)
Subject: Re: libio mmap changes

> Well, this is the cleanest solution but...  Function tables in DSOs are 
> not cheap.  I cannot say in the moment whether there is a better method 
> but I want to mention this here for the benefit of all.  If you have to 
> design some code in future avoiding function tables is advised.

Yes, this had occurred to me.  At least all the symbols are local/hidden so
it should only be RELATIVE relocs, no?  And since you added one for mmap in
the first place...  If it is kosher to add a flag bit somewhere, then the
other obvious approach is to have the old single file jump table and have
each operation test a flag bit--another test and branch on every callback
vs the startup relocation of a couple dozen words (and ones that can never
have conflicts if prelinked).

Follow-Ups:
- Re: libio mmap changes
  - From: Ulrich Drepper

References:
- Re: libio mmap changes
  - From: Ulrich Drepper

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