Cygwin: fhandler: move "isclosed" status flag into fhandler_pipe_fifo

The isclosed flag is only used in pipe and FIFO code, so move the
flag down into the fhandler_pipe_fifo class.

Note that such a flag is not sufficient to avoid evil, like closing
an already closing fhandler from another thread.  If we ever need this,
it has to be implemented threadsafe.

Signed-off-by: Corinna Vinschen <corinna@vinschen.de>

winsup/cygwin/fhandler/base.cc

@@ -1579,7 +1579,6 @@ fhandler_base::fhandler_base () :
   ra.raixget = 0;
   ra.raixput = 0;
   ra.rabuflen = 0;
-  isclosed (false);
 }
 
 /* Normal I/O destructor */

winsup/cygwin/fhandler/fifo.cc

@@ -1524,6 +1524,7 @@ fhandler_fifo::cancel_reader_thread ()
 int
 fhandler_fifo::close ()
 {
+  isclosed (true);
   if (select_sem)
     {
       release_select_sem ("close");

winsup/cygwin/fhandler/pipe.cc

@@ -31,7 +31,10 @@ STATUS_PIPE_EMPTY simply means there's no data to be read. */
 		   || _s == STATUS_PIPE_EMPTY; })
 
 fhandler_pipe_fifo::fhandler_pipe_fifo ()
-  : fhandler_base (), pipe_buf_size (DEFAULT_PIPEBUFSIZE), pipe_mtx (NULL)
+  : fhandler_base (),
+    status (),
+    pipe_buf_size (DEFAULT_PIPEBUFSIZE),
+    pipe_mtx (NULL)
 {
 }
 
@@ -758,6 +761,7 @@ fhandler_pipe::dup (fhandler_base *child, int flags)
 int
 fhandler_pipe::close ()
 {
+  isclosed (true);
   if (select_sem)
     {
       release_select_sem ("close");

winsup/cygwin/local_includes/fhandler.h

@@ -179,14 +179,13 @@ class fhandler_base
 					read or write access */
     unsigned close_on_exec      : 1; /* close-on-exec */
     unsigned need_fork_fixup    : 1; /* Set if need to fixup after fork. */
-    unsigned isclosed		: 1; /* Set when fhandler is closed. */
     unsigned mandatory_locking	: 1; /* Windows mandatory locking */
 
    public:
     status_flags () :
       rbinary (0), rbinset (0), wbinary (0), wbinset (0), nohandle (0),
       did_lseek (0), query_open (no_query), close_on_exec (0),
-      need_fork_fixup (0), isclosed (0), mandatory_locking (0)
+      need_fork_fixup (0), mandatory_locking (0)
       {}
   } status, open_status;
 
@@ -290,7 +289,6 @@ class fhandler_base
   IMPLEMENT_STATUS_FLAG (query_state, query_open)
   IMPLEMENT_STATUS_FLAG (bool, close_on_exec)
   IMPLEMENT_STATUS_FLAG (bool, need_fork_fixup)
-  IMPLEMENT_STATUS_FLAG (bool, isclosed)
   IMPLEMENT_STATUS_FLAG (bool, mandatory_locking)
 
   int get_default_fmode (int flags);
@@ -1195,11 +1193,20 @@ class fhandler_socket_unix : public fhandler_socket
 /* A parent of fhandler_pipe and fhandler_fifo. */
 class fhandler_pipe_fifo: public fhandler_base
 {
+  struct status_flags
+  {
+    unsigned isclosed		: 1; /* Set when pipe/FIFO fhandler is closed. */
+   public:
+    status_flags () : isclosed (0) {}
+  } status;
+
  protected:
   size_t pipe_buf_size;
   HANDLE pipe_mtx; /* Used only in the pipe case */
   virtual void release_select_sem (const char *) {};
 
+  IMPLEMENT_STATUS_FLAG (bool, isclosed)
+
  public:
   fhandler_pipe_fifo ();
 

winsup/cygwin/posix_ipc.cc

@@ -333,7 +333,6 @@ mq_close (mqd_t mqd)
       if (mq_notify (mqd, NULL))        /* unregister calling process */
         __leave;
 
-      fd->isclosed (true);
       fd->close ();
       fd.release ();
       return 0;

winsup/cygwin/syscalls.cc

@@ -1692,7 +1692,6 @@ close (int fd)
     res = -1;
   else
     {
-      cfd->isclosed (true);
       res = cfd->close_with_arch ();
       cfd.release ();
     }