* fhandler.h (fhandler_tty_master::fixup_after_fork): Remove declaration.

(fhandler_tty_master::fixup_after_exec): Ditto.
* fhandler_tty.cc (fhandler_tty_master::init): Fix so that children do not
inherit master tty handles.
(fhandler_tty_master::fixup_after_fork): Remove, since it was never used.
(fhandler_tty_master::fixup_after_exec): Ditto.
* pinfo.cc (_pinfo::set_ctty): Increment open_fhs when ctty is set.
* cygheap.cc (cygheap_init): Ditto.
* syscalls.cc (setsid): *Always* call close on opened ctty since the archetype
is associated with the ctty and it counts as an opened handle.
* tty.cc (tty::common_init): Don't protect input/output mutex since it confuses
subsequent fork/execs when CYGWIN=tty.

winsup/cygwin/tty.h

@@ -87,7 +87,7 @@ class fhandler_pty_master;
 class tty: public tty_min
 {
   HANDLE get_event (const char *fmt, BOOL manual_reset = FALSE)
-    __attribute__ ((regparm (2)));
+    __attribute__ ((regparm (3)));
 public:
   HWND  hwnd;	/* Console window handle tty belongs to */