GetModuleFileName() hang during signal processing

[Joe Buehler]

The problem I have been chasing appears to be a hang calling
GetModuleFileName() in interruptible() in exceptions.cc.

In the cases where this works, the address passed to the function
is a pointer at user DLL data.  In the case of the hang,
it is a pointer at ntdll.dll data.

This is with NT4 SP5.  Any suggested workarounds?  For the moment,
I am going to try forcing "not interruptible" when in Microsoft
DLL address range (for NT anyway).
-- 
Joe Buehler

   409 6517151 [sig] ksh 480 setup_handler: suspending mainthread 0x1CC
   320 6517471 [sig] ksh 480 setup_handler: checking mutos
   332 6517803 [sig] ksh 480 setup_handler: check 0x610E6C90
   330 6518133 [sig] ksh 480 setup_handler: check 0x610E559C
   274 6518407 [sig] ksh 480 setup_handler: check 0x610E4704
   273 6518680 [sig] ksh 480 setup_handler: check 0x610E3A4C
   310 6518990 [sig] ksh 480 setup_handler: check 0x610E38C4
   286 6519276 [sig] ksh 480 setup_handler: check 0x610E4FA8
   291 6519567 [sig] ksh 480 setup_handler: check 0x610E35CC
   361 6519928 [sig] ksh 480 setup_handler: check 0x610E49C4
   257 6520185 [sig] ksh 480 setup_handler: check 0x610E551C
   247 6520432 [sig] ksh 480 setup_handler: check mainthread.frame
   159 6520591 [sig] ksh 480 setup_handler: getting thread context 0x1CC iam 0xE4
   272 6520863 [sig] ksh 480 setup_handler: got thread context
   141 6521004 [sig] ksh 480 setup_handler: check priority
   131 6521135 [sig] ksh 480 setup_handler: check th
   123 6521258 [sig] ksh 480 setup_handler: checking interruptible
   129 6521387 [sig] ksh 480 interruptible: interruptible()
   174 6521561 [sig] ksh 480 interruptible: about to call GetModuleFileName(0x77F60000, 0x90F840, 20)