*** empty log message ***

1 files changed, 116 insertions, 0 deletions

diff --git a/libports/import-port.c b/libports/import-port.c
new file mode 100644
index 00000000..b958245f
--- /dev/null
+++ b/libports/import-port.c
@@ -0,0 +1,116 @@
+/* Create a new port structure using an externally supplied receive right
+
+   Copyright (C) 1995, 1996 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>
+
+/* For an existing receive right PORT, create and return in RESULT a new port
+   structure; BUCKET, SIZE, and CLASS args are as for ports_create_port. */
+error_t
+ports_import_port (struct port_class *class, struct port_bucket *bucket,
+		   mach_port_t port, size_t size, void *result)
+{
+  error_t err;
+  mach_port_status_t stat;
+  struct port_info *pi;
+  mach_port_t foo;
+  
+  err = mach_port_get_receive_status (mach_task_self (), port, &stat);
+  if (err)
+    return err;
+
+  if (size < sizeof (struct port_info))
+    size = sizeof (struct port_info);
+  
+  pi = malloc (size);
+  if (! pi)
+    return ENOMEM;
+  
+  pi->class = class;
+  pi->refcnt = 1 + !!stat.mps_srights;
+  pi->weakrefcnt = 0;
+  pi->cancel_threshold = 0;
+  pi->mscount = stat.mps_mscount;
+  pi->flags = stat.mps_srights ? PORT_HAS_SENDRIGHTS : 0;
+  pi->port_right = port;
+  pi->current_rpcs = 0;
+  pi->bucket = bucket;
+  
+  mutex_lock (&_ports_lock);
+  
+ loop:
+  if (class->flags & PORT_CLASS_NO_ALLOC)
+    { 
+      class->flags |= PORT_CLASS_ALLOC_WAIT;
+      if (hurd_condition_wait (&_ports_block, &_ports_lock))
+	goto cancelled;
+      goto loop;
+    }
+  if (bucket->flags & PORT_BUCKET_NO_ALLOC)
+    {
+      bucket->flags |= PORT_BUCKET_ALLOC_WAIT;
+      if (hurd_condition_wait (&_ports_block, &_ports_lock))
+	goto cancelled;
+      goto loop;
+    }
+
+  err = ihash_add (bucket->htable, port, pi, &pi->hentry);
+  if (err)
+    goto lose;
+
+  pi->next = class->ports;
+  pi->prevp = &class->ports;
+  if (class->ports)
+    class->ports->prevp = &pi->next;
+  class->ports = pi;
+  bucket->count++;
+  class->count++;
+  mutex_unlock (&_ports_lock);
+  
+  mach_port_move_member (mach_task_self (), port, bucket->portset);
+
+  if (stat.mps_srights)
+    {
+      err = mach_port_request_notification (mach_task_self (), port,
+					    MACH_NOTIFY_NO_SENDERS, 
+					    stat.mps_mscount, 
+					    port, MACH_MSG_TYPE_MAKE_SEND_ONCE,
+					    &foo);
+      assert_perror (err);
+      if (foo != MACH_PORT_NULL)
+	mach_port_deallocate (mach_task_self (), foo);
+    }
+
+  *(void **)result = pi;
+  return 0;
+
+ cancelled:
+  err = EINTR;
+ lose:
+  mutex_unlock (&_ports_lock);
+  free (pi);
+
+  return err;
+}