From: Rich Felker <dalias@libc.org>
To: musl@lists.openwall.com
Subject: Re: Why musl define PAGE_SIZE
Date: Fri, 11 Sep 2015 16:01:11 -0400 [thread overview]
Message-ID: <20150911200111.GX17773@brightrain.aerifal.cx> (raw)
In-Reply-To: <CAAKbDrdOD3yHQ2US9F6kaM9r983ucsfMZA-REVcbsHg2B8iW-A@mail.gmail.com>
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?
The page size, and whether it's a constant or variable, is part of the
target ABI. musl provides the PAGE_SIZE macro on targets where it's
constant because it may be useful to applications that want to
optimize for the case where a fixed page size is known. This is no
different from providing definitions reflecting other parts of the ABI
like type definitions or macro constants for communicating with system
interfaces.
Rich
prev parent reply other threads:[~2015-09-11 20:01 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-09-11 19:28 Yuxin Ren
2015-09-11 19:44 ` Isaac Dunham
2015-09-11 19:53 ` Yuxin Ren
2015-09-11 20:10 ` Rich Felker
2015-09-11 20:01 ` Rich Felker [this message]
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