1 files changed, 50 insertions, 0 deletions
diff --git a/libdiskfs/io-seek.c b/libdiskfs/io-seek.c
new file mode 100644
index 00000000..89f797e1
--- /dev/null
+++ b/libdiskfs/io-seek.c
@@ -0,0 +1,50 @@
+/* 
+   Copyright (C) 1994 Free Software Foundation
+
+   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"
+
+#define diskfs_readonly 0
+
+/* Implement io_seek as described in <hurd/io.defs>. */
+error_t
+diskfs_S_io_seek (struct protid *cred,
+		  off_t offset,
+		  int whence,
+		  off_t *newoffset)
+{
+  
+  CHANGE_IP_FIELD (cred,
+		   ({
+		     if (!(err = ioserver_get_conch (&ip->i_conch)))
+		       switch (whence)
+			 {
+			 case SEEK_SET:
+			   cred->po->filepointer = offset;
+			   break;
+			 case SEEK_CUR:
+			   cred->po->filepointer += offset;
+			   break;
+			 case SEEK_END:
+			   cred->po->filepointer = ip->di->di_size + offset;
+			   break;
+			 default:
+			   err = EINVAL;
+			   break;
+			 }
+		     *newoffset = cred->po->filepointer;
+		   }));
+}