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From: Shark8 <onewingedshark@gmail.com>
Newsgroups: comp.lang.ada
Subject: Re: Does mmap gives a right result?!
Date: Sun, 3 Oct 2010 12:32:25 -0700 (PDT)
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Date: 2010-10-03T12:32:25-07:00
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On Oct 3, 1:22=A0pm, Francesco PIRANEO GIULIANO
<liste.fpira...@gmail.com> wrote:
> Bjorn,
> Jeff,
>
> Thank you for your answer.
>
> I'm going to download and try GNAT component collection; before this
> Jeff I think you have reason:
>
> The original C code looks like:
> fbuffer =3D mmap(NULL, fix.smem_len, PROT_READ | PROT_WRITE, MAP_FILE |
> MAP_SHARED, fb_fd, 0);
>
> and I translated it into:
> fbindex :=3D mmap(0, fbhandler.fixinfo.smem_len, fbhandler.PROT_READ +
> fbhandler.PROT_WRITE, fbhandler.MAP_FILE + fbhandler.MAP_SHARED, fbid,
> 0);
>
> ...not the same! :-) Maybe if I'll try to change the "0" to "NULL" it
> will works... maybe!
>
> There is an equivalence of the C's NULL in Ada?
>
> Thank you again.
> Francesco

Like too many things in C NULL is somewhat ill-defined; do you mean
the character-sized all-zero value used to terminate strings, or the
all-zero valued memory-address sized pointer value? By the context
here it is obvious that the later is what you're asking about but Ada
provides both: There is the Character NUL and the "null" keyword
which, in access-terms, is the null-pointer, the "null" keyword
resolves down to other meanings depending on the context: the null-
statement, a null-record, etc.