On Sun, Oct 03, 1999 at 09:42:45AM +1000, Bruce Evans wrote:
> 
> I think the POSIX way is to use an auxiliary error code in siginfo_t to
> distinguish the causes of the signal.  This only works for SA_SIGINFO
> handlers.  We do something similar using the signal code of 3-arg signal
> handlers.
> 

>From Solaris 2.6 _AND_ Digital Unix 4.0E:

      _________________________________________________________
      Signal    Code             Definition
      _________________________________________________________

     SIGSEGV  SEGV_MAPERR    address not mapped to object
              SEGV_ACCERR    invalid permissions for mapped object

     SIGBUS   BUS_ADRALN     invalid address alignment
              BUS_ADRERR     non-existent physical address
              BUS_OBJERR     object specific hardware error


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