Cygwin: FIFO: make certain errors non-fatal

If update_my_handlers fails to duplicate one or more handles, just
mark the corresponding handlers as being in an error state.

But if update_my_handlers is unable to open the process of the
previous owner, it's likely that something serious has gone wrong, so
we continue to make that a fatal error.

diff --git a/winsup/cygwin/fhandler_fifo.cc b/winsup/cygwin/fhandler_fifo.cc
index 69dda0811ad3a545ae016529a3cd90f721bfa6e1..91a276ee92fa731696e550366a4fce708a28f08f 100644 (file)
--- a/winsup/cygwin/fhandler_fifo.cc
+++ b/winsup/cygwin/fhandler_fifo.cc
@@ -383,11 +383,7 @@ fhandler_fifo::update_my_handlers ()
   else
     prev_proc = OpenProcess (PROCESS_DUP_HANDLE, false, prev.winpid);
   if (!prev_proc)
-    {
-      debug_printf ("Can't open process of previous owner, %E");
-      __seterrno ();
-      goto out;
-    }
+    api_fatal ("Can't open process of previous owner, %E");
 
   for (int i = 0; i < get_shared_nhandlers (); i++)
     {
@@ -399,14 +395,17 @@ fhandler_fifo::update_my_handlers ()
                            !close_on_exec (), DUPLICATE_SAME_ACCESS))
        {
          debug_printf ("Can't duplicate handle of previous owner, %E");
-         --nhandlers;
          __seterrno ();
-         goto out;
+         fc.state = fc_error;
+         fc.last_read = false;
+         ret = -1;
+       }
+      else
+       {
+         fc.state = shared_fc_handler[i].state;
+         fc.last_read = shared_fc_handler[i].last_read;
        }
-      fc.state = shared_fc_handler[i].state;
-      fc.last_read = shared_fc_handler[i].last_read;
     }
-out:
   set_prev_owner (null_fr_id);
   return ret;
 }
@@ -493,7 +492,7 @@ fhandler_fifo::fifo_reader_thread_func ()
              set_owner (me);
              set_pending_owner (null_fr_id);
              if (update_my_handlers () < 0)
-               api_fatal ("Can't update my handlers, %E");
+               debug_printf ("error updating my handlers, %E");
              owner_found ();
              owner_unlock ();
              /* Fall through to owner_listen. */