Tue Feb 16 05:31:23 1999 Thomas Bushnell, BSG <tb@mit.edu>

	* io-revoke.c: New file.
	* Makefile (IOSRCS): Add io-revoke.c.

1 files changed, 59 insertions, 0 deletions

diff --git a/libdiskfs/io-revoke.c b/libdiskfs/io-revoke.c
new file mode 100644
index 00000000..ddda95fa
--- /dev/null
+++ b/libdiskfs/io-revoke.c
@@ -0,0 +1,59 @@
+/* 
+   Copyright (C) 1999 Free Software Foundation
+   Written by Thomas Bushnell, BSG.
+
+   This program 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.
+
+   This program 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 "priv.h"
+#include "io_S.h"
+
+/* Implement io_revoke as described in <hurd/io.defs>. */
+kern_return_t
+diskfs_S_io_revoke (struct protid *cred)
+{
+  error_t err;
+  struct node *np;
+
+  error_t 
+    iterator_function (void *port)
+    {
+      struct protid *user = port;
+      
+      if ((user != cred) && (user->po->np == np))
+	ports_destroy_right (user);
+    }
+
+  if (!cred)
+    return EOPNOTSUPP;
+  
+  np = cred->po->np;
+
+  mutex_lock (&np->lock);
+  
+  err = fshelp_isowner (&np->dn_stat, cred->user);
+  if (err)
+    {
+      mutex_unlock (&np->lock);
+      return err;
+    }
+  
+  ports_bucket_iterate (diskfs_port_bucket, iterator_function);
+
+  mutex_unlock (&np->lock);
+
+  return 0;
+}
+
+