Reintegrate socket duplication via WSADuplicateSocket/WSASocket.

	* autoload.cc (WSADuplicateSocketW): Define.
	(WSASocketW): Define.
	* dtable.cc (dtable::release): Call dec_need_fixup_before if necessary.
	(dtable::fixup_before_fork): New function.
	(dtable::fixup_before_exec): New function.
	* dtable.h (class dtable): Add member cnt_need_fixup_before.  Add
	declarations for above new functions.
	(dtable::dec_need_fixup_before): New inline method.
	(dtable::inc_need_fixup_before): New inline method.
	(dtable::need_fixup_before): New inline method.
	* fhandler.h (fhandler_base::fixup_before_fork_exec): New virtual
	method.
	(fhandler_base::need_fixup_before): New virtual method.
	(class fhandler_socket): Add member prot_info_ptr.
	(fhandler_socket::init_fixup_before): Declare.
	(fhandler_socket::need_fixup_before): New inline method.
	(fhandler_socket::fixup_before_fork_exec): Declare.
	(fhandler_socket::fixup_after_exec): Declare.
	* fhandler_socket.cc (fhandler_socket::fhandler_socket): Initialize
	prot_info_ptr to NULL.
	(fhandler_socket::~fhandler_socket): Free prot_info_ptr conditionally.
	(fhandler_socket::init_fixup_before): New method.
	(fhandler_socket::fixup_before_fork_exec): Ditto.
	(fhandler_socket::fixup_after_fork): Use WSASocketW to duplicate
	socket if necessary.
	(fhandler_socket::fixup_after_exec): New method.
	(fhandler_socket::dup): Use fixup_before_fork_exec/fixup_after_fork
	to duplicate socket if necessary.
	* fork.cc (frok::parent): Start child suspended if some fhandler
	needs fixup before fork.  If so, call dtable::fixup_before_fork after
	CreateProcess and resume child.
	* net.cc (fdsock): Try to find out if socket needs fixup before and
	initialize socket accordingly.  Add HUGE comment to explain what happens
	and why.
	* spawn.cc (spawn_guts): Start child suspended if some fhandler needs
	fixup before exec.  If so, call dtable::fixup_before_exec after
	CreateProcess.

1 files changed, 11 insertions, 1 deletions

diff --git a/winsup/cygwin/dtable.h b/winsup/cygwin/dtable.h
index c134454..7b5af6f 100644
--- a/winsup/cygwin/dtable.h
+++ b/winsup/cygwin/dtable.h
@@ -31,14 +31,22 @@ class dtable
   unsigned farchetype;
   static const int initial_archetype_size = 8;
   int first_fd_for_open;
+  int cnt_need_fixup_before;
   void lock () {lock_process::locker.acquire ();}
   void unlock () {lock_process::locker.release ();}
 public:
   size_t size;
 
-  dtable () : archetypes (NULL), narchetypes (0), farchetype (0), first_fd_for_open(3) {}
+  dtable () : archetypes (NULL), narchetypes (0), farchetype (0), first_fd_for_open(3), cnt_need_fixup_before(0) {}
   void init () {first_fd_for_open = 3;}
 
+  void dec_need_fixup_before ()
+    { if (cnt_need_fixup_before > 0) --cnt_need_fixup_before; }
+  void inc_need_fixup_before ()
+    { cnt_need_fixup_before++; }
+  bool need_fixup_before ()
+    { return cnt_need_fixup_before > 0; }
+
   void move_fd (int, int);
   int vfork_child_dup ();
   void vfork_parent_restore ();
@@ -73,6 +81,8 @@ public:
   fhandler_base *find_archetype (device& dev);
   fhandler_base **add_archetype ();
   void delete_archetype (fhandler_base *);
+  void fixup_before_exec (DWORD win_proc_id);
+  void fixup_before_fork (DWORD win_proc_id);
   friend void dtable_init ();
   friend void __stdcall close_all_files (bool);
   friend class fhandler_disk_file;