But I do not think other libcs define PAGE_SIZE, such as glibc or diet-libc.
Is that true?

Thanks

On Fri, Sep 11, 2015 at 3:44 PM, Isaac Dunham <ibid.ag@gmail.com> 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.
> Hypothetically, we could get it from the Linux headers.
> But the Linux headers can and sometimes do introduce definitions and
> structs that violate the header namespaces, resulting in collisions
> (ie, kernel header defines struct foo, application defines struct foo
> without including any headers that *should* define it, application fails
> to compile.)
>
> HTH,
> Isaac Dunham
>