crash dumps

[Tim Newsham <newsham at aloha dot net>]

Hi,

    Having the exceptions (and stack trace) dumped to stderr is
usually of little use to me (especially when lots of programs
are running at once in the background), so I patched cygwin.dll
to dump the stack trace to the more traditional file 
<progname>.core.  This way I can look around the filesystem
for .core files to see if things crashed while I wasn't paying
attention or had stderr redirected someplace else.  I think
this is the sensible way to handle this and would like it
if cygwin adopted this technique :)

The patch is included below.  You may do what you want with
it, I release any rights to the code.

                                     Tim N.

*** winsup.970904t/exceptions.cc        Fri Oct 03 16:52:01 1997
--- winsup.970904t2/exceptions.cc       Thu Oct 23 10:56:50 1997
***************
*** 580,585 ****
--- 593,610 ----
        }
        else
        {
+           /* write to progname.core if possible */
+           char corename[MAX_PATH], *p;
+           p = strrchr(u->self->progname, '\\');
+           p = p ? p + 1 : u->self->progname;
+           sprintf(corename, "%.*s.core", MAX_PATH - sizeof ".core", p);
+           HANDLE h = CreateFile(corename, GENERIC_WRITE, 0, 0,
+                   CREATE_ALWAYS, 0, 0);
+           if(h != INVALID_HANDLE_VALUE) {
+               system_printf("Dumping stack trace to %s\n", corename);
+               SetStdHandle(STD_ERROR_HANDLE, h);
+           }
+
          traced = 1;
          dump_status (e, in);
          __stack_trace ();

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