[Vortex] How to tell whether a connection closed successfully?

[Jens Alfke]

In my VortexConnectionOnCloseFull handler, I want to check whether the  
connection closed normally, or was abruptly terminated. (So I can pass  
an error message up to my higher level code.)

I do this by checking vortex_connection_get_message. I assumed it  
would be NULL if there were no error condition. But actually there are  
at least three different values it can have during a normal close, so  
I have to insert hard-coded checks for those three strings:

         const char *errorMsg =  
vortex_connection_get_message(vortexConnection);
         if( errorMsg ) {
             if( 0!=strcmp(errorMsg,"close connection called")
                      && 0!=strcmp(errorMsg,"connection properly  
closed")
                      && 0!=strcmp(errorMsg,"channel closed properly"))
                 mySetError(errorMsg);
         }

This is ugly, and very fragile if any of the error messages change  
their wording in the future. There must be a better way to tell? (I've  
tried checking vortex_connection_is_ok, but it always returns false.)

—Jens
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