Initial revision

1 files changed, 88 insertions, 0 deletions

diff --git a/libfshelp/get-identity.c b/libfshelp/get-identity.c
new file mode 100644
index 00000000..8acbeac2
--- /dev/null
+++ b/libfshelp/get-identity.c
@@ -0,0 +1,88 @@
+/* Helper function for io_identity
+   Copyright (C) 1996 Free Software Foundation, Inc.
+   Written by Michael I. Bushnell, p/BSG.
+
+   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 <fshelp.h>
+#include <hurd/ports.h>
+#include <ihash.h>
+
+static struct port_class *idclass = 0;
+static struct mutex idlock = MUTEX_INITIALIZER;
+
+struct idspec 
+{
+  struct port_info pi;
+  ino_t fileno;
+};
+
+static void
+id_initialize ()
+{
+  assert (!idclass);
+  idclass = ports_create_class (0, 0);
+}
+
+error_t
+fshelp_get_identity (struct port_bucket *bucket,
+		     ino_t fileno,
+		     mach_port_t *pt)
+{
+  struct idspec *i;
+  error_t err = 0;
+
+  error_t check_port (void *arg)
+    {
+      struct idspec *i = arg;
+      if (i->pi.class == idclass && i->fileno == fileno)
+	{
+	  *pt = ports_get_right (i);
+	  return 1;
+	}
+      else
+	return 0;
+    }
+
+  mutex_lock (&idlock);
+  if (!idclass)
+    id_initialize ();
+
+  *pt = MACH_PORT_NULL;
+  
+  ports_bucket_iterate (bucket, check_port);
+
+  if (*pt != MACH_PORT_NULL)
+    {
+      mutex_unlock (&idlock);
+      return 0;
+    }
+  
+  err = ports_create_port (idclass, bucket, sizeof (struct idspec), &i);
+  if (err)
+    {
+      mutex_unlock (&idlock);
+      return err;
+    }
+  
+  *pt = ports_get_right (i);
+  ports_port_deref (i);
+  return 0;
+}
+
+