Reporting of "program no longer exists"

[Vladimir Prus]

Hi,
suppose a program being debugged got SIGSEGV and the user for GUI frontend 
tries the "next" command. Here's what happens:

   (gdb) -exec-next
   ^running
   *stopped,reason="signal-received",signal-name="SIGSEGV".....
   (gdb) -exec-next
   ^running
   Couldn't get registers: No such process.
   ^error,msg="Couldn't get registers: No such process."

I think this is a bit unfriendly to frontend.

(1) How can frontend disable the "next" command? Checking for "SIGSEGV" is 
possible, but it a bit of a hack.

(2) After getting the second response, how can frontend understand that this 
is really fatal, unfixable error? Looking at the specific text is obviously a 
hack?

How about making a notion of "inferior state" and announcing changes in the 
state. So, the above would become

   (gdb) -exec-next
   ^running
   *stopped,target-state="noncontinuable",
           reason="signal-received",signal-name="SIGSEGV".....
   (gdb) -exec-next
   ^running
   Couldn't get registers: No such process.
   ^error,msg="Couldn't get registers: No such process.",target-state="dead"

?

- Volodya