Re: SetUID

[michaelr_41@xxxxxxxxxxxxxx]

Thank you Scott.

On Fri, 2 Apr 2004 10:26:49 -0600 (CST), "Scott Klement"
<klemscot@xxxxxxxxxxxx> said:
> 
> Hi Michael,
> 
> On Fri, 2 Apr 2004 michaelr_41@xxxxxxxxxxxxxx wrote:
> >
> > D SetEUid         PR            10U 0 ExtProc('qsyseteuid')
> > D   UID                         10U 0 Const
> 
> This prototype has two major problems:
> 
> 1) the return value for seteuid is "int", yet you have it prototype as
> "unsigned."  That's a minor problem, though -- the only problem it'll
> cause is that errors will return 4294967295 instead of -1.  You can fix
> that problem by making the return value "10I 0"
> 
> 2) The UID parameter is supposed to be passed by VALUE.   This is a big
> problem -- the procedure is expecting to receive an integer, and you're
> sending it a pointer instead.
> 
> The only reason that this API would work the way you've got it prototyped
> is if the 4 bytes of the address of the variable that you pass happens to
> be the same value as is stored in the variable.   That will happen quite
> often with a value of zero, but I bet it won't happen with work with any
> other value.
> 
> The fix is to remove "CONST" and add "VALUE" in it's place.
> 
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-- 
  
  michaelr_41@xxxxxxxxxxxxxx

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