On Fri, 16 May 2008, Joerg Schilling wrote:
> "Richard L. Hamilton" <[EMAIL PROTECTED]> wrote:
>
>> Shouldn't this use MAP_ANON and an fd arg of -1 rather than explicitly
>> opening /dev/zero? One less thing to go wrong,
>> two less statements and syscalls, typically.
>
> The related lib is much older than MAP_ANON.
>
>
>
>> around that. And I remember that SVR2 on e.g. the AT&T 3B15 allowed
>> dereferencing at least a NULL char *, but I don't remember whether that
>> bad precedent was only intended to apply to char * (and presumably,
>
> The related code was definitely broken. SVR2 sources did e.g. expect to
> see a nul character when dereferencing argv[argc].
>
> BTW: From the C-standard, dereferencing a NULL pointer could also create
> pink smoke in your screen.
Can I have the sourcecode for that signal handler, please ?
:)
On a historical note, mmap'ing MAP_ANON and fd==-1 only was introduced
with Solaris 9 as far as I remember. Could've been Solaris 8, but anything
older I'm sure it required the /dev/zero "trick".
By the way, the manpage ld.so.1(1) mentions [EMAIL PROTECTED] see the section
at the
very bottom:
http://docs.sun.com/app/docs/doc/819-2239/ld.so.1-1
FrankH.
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