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Message-ID: <20150911201011.GY17773@brightrain.aerifal.cx>
Date: Fri, 11 Sep 2015 16:10:11 -0400
From: Rich Felker <dalias@...c.org>
To: musl@...ts.openwall.com
Subject: Re: Why musl define PAGE_SIZE
On Fri, Sep 11, 2015 at 12:44:02PM -0700, Isaac Dunham wrote:
> On Fri, Sep 11, 2015 at 03:28:52PM -0400, Yuxin Ren wrote:
> > Hi,
> >
> > I found in the bits/limits.h file, musl defines PAGE_SIZE macro .
> > I think this macro is always defined by operating system, not libc.
> >
> > Why does musl define this marco?
>
> It's required to be in limits.h, which has to be provided by libc for a
> full implementation.
It's not required. Lack of a definition means you have to query the
value at runtime with sysconf(_SC_PAGESIZE). But failure to provide a
value on platforms where it is constant just gratuitously pessimizes
programs that need to know page size.
Rich
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