Mail Archives: cygwin/2006/02/03/11:32:28
Dave Bodenstab wrote:
> On Thu Feb 2 22:55:08 2006 Corinna Vinschen <corinna-cygwin AT cygwin DOT com> wrote:
>
>
>>>Is this the way things are supposed to work on XP?
>>
>>This is a constraint of the underlying OS, yes. The old implementation
>>of mmap used up to 1.5.18 didn't support PROT_EXEC at all, it was just
>>fake. Since 1.5.19, PROT_EXEC mapping is now supported correctly, which
>>means, the underlying NT functions are called requesting PAGE_EXECUTE
>>protection.
>>
>>But here's the problem. To create file mappings with PAGE_EXECUTE
>>protection, the file must be opened with GENERIC_EXECUTE access.
>>This is done internally in mmap, but it fails if the file doesn't
>>have the execute permission set.
>>
>>Whether or not this behaviour is backed by SUSv3, I'm not sure. SUSv3
>>states "if an implementation cannot support the combination of access
>>types specified by prot, the call to mmap() shall fail.", so here's one
>>situation in which the implementation can't support the combination of
>>access types specified by prot.
>
>
> OK.
>
> I would like to modify my program to set the required permissions.
> Is the mapping between Cygwin's uname()'s sysname and XP, NT, 98SE,
> 98, etc. available somewhere? Actually, if I could just tell if the
> underlying windows is XP, that would be sufficient I think.
>
> Thanks.
>
>
XP == NT_5.1
2k == NT_5.0
98 == 4.10
95 == 4.0 (I believe)
I don't know what WinME is, and I don't particularly wish to either.
I /suspect/ that NT4 is likely to be NT_4.0, but this may have changed
with the later service packs (doubtful though, in my opinion). I don't
have an nt4 box to verify this with however.
Chris
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