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[Frama-c-discuss] using errno

Hi Pascal,

I aggree with you, it's better to send a file exemple that works.
But your answer is rigth, I've solved my problem with that short
implementation of errno:
int Ri_errno;
int * __errno_location (void)
{
  Ri_errno = Frama_C_interval (0 , 255);
  return &Ri_errno;
}

thx,

St?phane




Le samedi 07 novembre 2009 ? 12:22 +0100, CUOQ Pascal a ?crit :

> 
> > someone know how to treat errno ?
> 
> ___
> src code:
>   if (errno == 0) j=2;
> 
> the cil:
>   int *tmp ;
>   { /*undefined sequence*/  tmp = __errno_location(); ; }
>   /*@ assert \valid(tmp);
>           // synthesized
>        */
>   if (*tmp == 0) { j = 2; }
> ____
> 
> When I try to reproduce, I get:
> $ cat t.i
> main(){
> int j;
>  if (errno == 0) j=2;
> }
> $ /Volumes/raid/ppc/bin/toplevel.opt -print t.i
> Parsing
> t.i:3: Fatal error: Cannot resolve variable errno
> ...
> 
> 
> It seems to me that your pre-processor did most
> of the transformation here, not CIL. Could you show us
> the pre-processed code corresponding to your example?
> 
> If your compilation platform is made of headers that
> insert calls to __errno_location() and of libraries that
> provide it, for reproducing the same context in Frama-C
> you have to provide the function in a
> separate C file that you should include in each of
> your analysis projects.
> 
> Pascal
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