Rename cygWFMO to cygwait throughout and use the magic of polymorphism to "wait

for stuff".
* fhandler.cc (fhandler_base_overlapped::wait_overlapped): Use simplified arg
form of cygwait.
* fhandler_console.cc (fhandler_console::read): Ditto.
* fhandler_audio.cc (fhandler_dev_dsp::Audio_out::waitforspac): Ditto.
(fhandler_dev_dsp::Audio_in::waitfordata): Ditto.
* fhandler_fifo.cc (fhandler_fifo::wait): Ditto.
* fhandler_serial.cc (fhandler_serial::raw_read): Ditto.
(fhandler_serial::raw_write): Ditto.
* select.cc (cygwin_select): Ditto.
* sigproc.h (cygwait): Rename from cygWFMO.  Define two argument and single
argument forms of this function.
* fhandler_tty.cc (fhandler_pty_slave::open): Use method to query if tty is
open.
(fhandler_pty_slave::read): Send SIGHUP when master is detected as closed.
(fhandler_pty_common::close): Close input_available_event in callers since
master may need to signal it first.
(fhandler_pty_master::close): Lie and set input_available_event when closing,
then close input_available_event.
(fhandler_pty_slave::close): Close input_available_event explicitly here.
* tty.h (tty::is_master_closed): Declare new method.

winsup/cygwin/sigproc.h

@@ -81,8 +81,8 @@ void __stdcall sigproc_init ();
 #ifdef __INSIDE_CYGWIN__
 void __stdcall sigproc_terminate (enum exit_states);
 
-static inline
-DWORD cygWFMO (DWORD n, DWORD howlong, ...)
+static inline DWORD
+cygwait (DWORD n, DWORD howlong, ...)
 {
   va_list ap;
   va_start (ap, howlong);
@@ -96,6 +96,18 @@ DWORD cygWFMO (DWORD n, DWORD howlong, ...)
     n--;
   return WaitForMultipleObjects (n, w4, FALSE, howlong);
 }
+
+static inline DWORD
+cygwait (HANDLE h, DWORD wait = INFINITE)
+{
+  return cygwait (1, wait, h);
+}
+
+static inline DWORD
+cygwait (DWORD wait)
+{
+  return cygwait ((DWORD) 0, wait);
+}
 #endif
 bool __stdcall pid_exists (pid_t) __attribute__ ((regparm(1)));
 int __stdcall sig_send (_pinfo *, siginfo_t&, class _cygtls *tls = NULL) __attribute__ ((regparm (3)));