PAGESIZE

[Zack Weinberg]

On Tue, Sep 05, 2000 at 02:55:46PM -0700, Bruce Korb wrote:
> DJ Delorie wrote:
> > 
> > 2000-09-05  Bruce Korb  <bkorb@gnu.org>
> > 
> >         * gcc/fixinc/fixincl.c(load_file): always read header files
> >         with sizes that are a multiple of the page size.
> > 
> > "PAGESIZE" isn't always defined.  It isn't on Linux, for example.
> 
> I presume that that is the case so that it can be varied?
> >From what to what, I wonder.  Surely not from one memory
> manager to another within the same OS image.  :-).

Different ABIs on the same platform; different memory models;
different versions of the same processor.

In practice, yes, it's a constant on any given architecture.

> At any rate, there is no sysconf(2) attribute for it either.
> I propose disabling mmap altogether, unless someone can point
> me to a portable solution.  (Always assume that a memory page
> will never be smaller than 0x1000, for example?  I never get
> warm fuzzies from such assumptions.)

This is overkill.  getpagesize() is in libiberty, you don't have to
worry about it.

zw