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SubjectRe: Changing argv[0] under Linux.
On Tue, Jan 14, 2003 at 03:04:18PM -0800, Bob Miller wrote:
> On Tue, Jan 14, 2003 at 11:04:01PM +0100, DervishD wrote:
> > Hi Philippe :)
> >
> > > You just overwrote all your arguments (argv[0] and others) and part of
> > > the environment.
> >
> > Oh, sh*t, you're true, and that is the problem I was afraid to
> > suffer from. Then, all I can do is overwrite argv[0] with a new
> > string whose length is less or equal than the existing one.
> >
> > Well, I suppose I must go with that limitation.
> >
> > Thanks, Philippe, for the code snipped and the explanation.
> >
> > Raúl
> > -
>
> Or you can copy your all your args and env to a temporary place and
> then re-build your args and env with the new argv[0] in it's place.
> But you must be carefull that your new argv[0] length plus the
> length of all remaining args, envp and pointers is not greater than
> the system defined size for this space.
>
In thinking about this more this will NOT work. The user stack starts
right after your envp. So, writing more info there would blow away
your stack.

--
Bob Miller Email: rem@osdl.org
Open Source Development Lab Phone: 503.626.2455 Ext. 17
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