* dcrt0.cc (getstack): New function.

(alloc_stack): Use tls stuff for stack info rather than calling VirtualQuery.
(dll_crt0_0): Initialize _impure_ptr stuff much earlier.  Move
init_console_handler here.
* fork.cc (class frok): New class renamed from local fork() struct.
(stack_base): Change argument type.  Use tls stuff to determine stack info
rather than calling VirtualQuery.
(frok::child): Rename from fork_child.  Eliminate now unneeded arguments.
(frok::parent): Rename from fork_parent and ditto.  Set error and errno as
appropriate.  Fixup impersonation in cleanup, if needed.  Try harder to set
errno appropriately.
(fork): Define "grouped" as a frok type.  Deal with errors from fork_parent
here.
* init.cc (dll_entry): Remove init_console_handler call.

winsup/cygwin/init.cc

@@ -148,7 +148,6 @@ dll_entry (HANDLE h, DWORD reason, void *static_load)
     case DLL_PROCESS_ATTACH:
       cygwin_hmodule = (HMODULE) h;
       dynamically_loaded = (static_load == NULL);
-      init_console_handler (TRUE);
 
       /* Is the stack at an unusual address?  This is, an address which
          is in the usual space occupied by the process image, but below