1 files changed, 93 insertions, 0 deletions
diff --git a/libports/bucket-iterate.c b/libports/bucket-iterate.c
new file mode 100644
index 00000000..babc2045
--- /dev/null
+++ b/libports/bucket-iterate.c
@@ -0,0 +1,93 @@
+/* Iterate a function over the ports in a bucket.
+   Copyright (C) 1995, 1999 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., 59 Temple Place - Suite 330, Boston, MA  02111, USA. */
+
+#include "ports.h"
+#include <hurd/ihash.h>
+
+
+/* Internal entrypoint for both ports_bucket_iterate and ports_class_iterate.
+   If CLASS is non-null, call FUN only for ports in that class.  */
+error_t
+_ports_bucket_class_iterate (struct port_bucket *bucket,
+			     struct port_class *class,
+			     error_t (*fun)(void *))
+{
+  /* This is obscenely ineffecient.  ihash and ports need to cooperate
+     more closely to do it efficiently. */
+  void **p;
+  size_t i, n, nr_items;
+  error_t err;
+
+  pthread_mutex_lock (&_ports_lock);
+
+  if (bucket->htable.nr_items == 0)
+    {
+      pthread_mutex_unlock (&_ports_lock);
+      return 0;
+    }
+
+  nr_items = bucket->htable.nr_items;
+  p = malloc (nr_items * sizeof *p);
+  if (p == NULL)
+    {
+      pthread_mutex_unlock (&_ports_lock);
+      return ENOMEM;
+    }
+
+  n = 0;
+  HURD_IHASH_ITERATE (&bucket->htable, arg)
+    {
+      struct port_info *const pi = arg;
+
+      if (class == 0 || pi->class == class)
+	{
+	  pi->refcnt++;
+	  p[n] = pi;
+	  n++;
+	}
+    }
+  pthread_mutex_unlock (&_ports_lock);
+
+  if (n != nr_items)
+    {
+      /* We allocated too much.  Release unused memory.  */
+      void **new = realloc (p, n * sizeof *p);
+      if (new)
+        p = new;
+    }
+
+  err = 0;
+  for (i = 0; i < n; i++)
+    {
+      if (!err)
+	err = (*fun)(p[i]);
+      ports_port_deref (p[i]);
+    }
+
+  free (p);
+  return err;
+}
+
+error_t
+ports_bucket_iterate (struct port_bucket *bucket,
+		      error_t (*fun)(void *))
+{
+  return _ports_bucket_class_iterate (bucket, 0, fun);
+}