1 files changed, 80 insertions, 0 deletions
diff --git a/libports/reallocate-from-external.c b/libports/reallocate-from-external.c
new file mode 100644
index 00000000..74e6d76c
--- /dev/null
+++ b/libports/reallocate-from-external.c
@@ -0,0 +1,80 @@
+/* 
+   Copyright (C) 1995 Free Software Foundation, Inc.
+   Written by Michael I. Bushnell.
+
+   This file is part of the GNU Hurd.
+
+   The GNU Hurd is free software; you can redistribute it and/or
+   modify it under the terms of the GNU General Public License as
+   published by the Free Software Foundation; either version 2, or (at
+   your option) any later version.
+
+   The GNU Hurd is distributed in the hope that it will be useful, but
+   WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
+
+#include "ports.h"
+#include <assert.h>
+#include <cthreads.h>
+#include <hurd/ihash.h>
+#include <mach/notify.h>
+
+void
+ports_reallocate_from_external (void *portstruct, mach_port_t receive)
+{
+  struct port_info *pi = portstruct;
+  mach_port_status_t stat;
+  int dropref = 0;
+  mach_port_t foo;
+  error_t err;
+
+  err = mach_port_get_receive_status (mach_task_self (), receive, &stat);
+  assert_perror (err);
+  
+  mutex_lock (&_ports_lock);
+  
+  err = mach_port_mod_refs (mach_task_self (), pi->port_right,
+			    MACH_PORT_RIGHT_RECEIVE, -1);
+  assert_perror (err);
+
+  ihash_locp_remove (pi->bucket->htable, pi->hentry);
+  
+  if ((pi->flags & PORT_HAS_SENDRIGHTS) && !stat.mps_srights)
+    {
+      dropref = 1;
+      pi->flags &= ~PORT_HAS_SENDRIGHTS;
+    }
+  else if ((pi->flags & PORT_HAS_SENDRIGHTS == 0) && stat.mps_srights)
+    {
+      pi->flags |= PORT_HAS_SENDRIGHTS;
+      pi->refcnt++;
+    }
+  
+  pi->port_right = receive;
+  pi->mscount = stat.mps_mscount;
+  
+  ihash_add (pi->bucket->htable, receive, pi, &pi->hentry);
+  mutex_unlock (&_ports_lock);
+  
+  mach_port_move_member (mach_task_self (), receive, pi->bucket->portset);
+  
+  if (stat.mps_srights)
+    {
+      err = mach_port_request_notification (mach_task_self (), receive,
+					    MACH_NOTIFY_NO_SENDERS,
+					    stat.mps_mscount, receive,
+					    MACH_MSG_TYPE_MAKE_SEND_ONCE,
+					    &foo);
+      assert_perror (err);
+      if (foo != MACH_PORT_NULL)
+	mach_port_deallocate (mach_task_self (), foo);
+    }
+
+  if (dropref)
+    ports_port_deref (pi);
+}