* Makefile.in (DLL_OFILES): Add hookapi.o. Eliminate some cruft.

* cygheap.h (cygheap_types): Add new enum: HEAP_1_HOOK.
(hook_chain): New struct.
(init_cygheap::hooks): Define new element.
* cygheap.cc (cygheap_fixup_in_child): Zero hook chain on exec.
* dcrt0.cc (dll_crt0_1): Call ld_preload just before calling main function.
* external.cc (cygwin_internal): Implement CW_HOOK.
* fork.cc (fork_child): Call fixup_hooks_after_fork.
* init.cc (cygwin_hmodule): Reinstate after a long absence.
* include/sys/cygwin.h: Define CW_HOOK.
* hookapi.cc: New file.
* select.cc (start_thread_socket): Add debugging output.
* fhandler_disk_file.cc (fhandler_disk_file::fchmod): gcc 4.x accommodation.
* fhandler_socket.cc (fhandler_socket::connect): Make sure that err is
initialized.

winsup/cygwin/init.cc

@@ -108,6 +108,8 @@ respawn_wow64_process ()
 
 extern void __stdcall dll_crt0_0 ();
 
+HMODULE NO_COPY cygwin_hmodule;
+
 extern "C" int WINAPI
 dll_entry (HANDLE h, DWORD reason, void *static_load)
 {
@@ -116,6 +118,7 @@ dll_entry (HANDLE h, DWORD reason, void *static_load)
   switch (reason)
     {
     case DLL_PROCESS_ATTACH:
+      cygwin_hmodule = (HMODULE) h;
       /* Is the stack at an unusual high address?  Check if we're running on
 	 a 64 bit machine.  If so, respawn. */
       if (&is_64bit_machine >= (PBOOL) 0x400000