From: arne@vajhoej.dk   
      
   On 9/16/2025 7:31 AM, Craig A. Berry wrote:   
   > On 9/15/25 9:56 PM, Arne Vajhøj wrote:   
   >> On 9/15/2025 10:39 PM, Craig A. Berry wrote:   
   >>> call CMA$TIS_VMSERRNO_GET_ADDR   
   >>> !   
   >>> ! The above returns an address   
   >>> !   
   >>> examine/condition    
   >>   
   >> Interesting.   
   >>   
   >> The value I see is indeed 65535.   
   >>   
   >> One question answered, but two new questions pop up.   
   >>   
   >> 1) How does the C++ library know that the main program   
   >>     is Pascal and not C (for C I get a normal errno value)?   
      
   > On #1, remember that the value of errno doesn't mean anything except   
   > immediately after the error, so if C is successful but Pascal is not,   
   > the fact that you get different errno values doesn't really tell you   
   > anything.  If there is an error from both languages, then it does sound   
   > like something is different about the initialization of the image or the   
   > debugger session.  Since the debugger does have language-specific   
   > features, it may be a more likely suspect.   
      
   It is a about this.   
      
   Trying a gazillion things has let me to conclude that   
   C free sets errno when called on something allocated   
   with Pascal malloc_c_str.   
      
   Not yet clear to me why it does that. But I will find   
   a way to workaround it.   
      
   Arne   
      
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