1 files changed, 61 insertions, 0 deletions
diff --git a/libdiskfs/io-seek.c b/libdiskfs/io-seek.c
new file mode 100644
index 00000000..9e3ff093
--- /dev/null
+++ b/libdiskfs/io-seek.c
@@ -0,0 +1,61 @@
+/*
+   Copyright (C) 1994,1995,1996,2000,2006 Free Software Foundation, Inc.
+
+   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"
+#include <unistd.h>
+
+/* Implement io_seek as described in <hurd/io.defs>. */
+kern_return_t
+diskfs_S_io_seek (struct protid *cred,
+		  off_t offset,
+		  int whence,
+		  off_t *newoffset)
+{
+  error_t err = 0;
+  struct node *np;
+
+  if (!cred)
+    return EOPNOTSUPP;
+
+  np = cred->po->np;
+
+  pthread_mutex_lock (&np->lock);
+
+  iohelp_get_conch (&np->conch);
+  switch (whence)
+    {
+    case SEEK_CUR:
+      offset += cred->po->filepointer;
+      goto check;
+    case SEEK_END:
+      offset += np->dn_stat.st_size;
+    case SEEK_SET:
+    check:
+      if (offset >= 0)
+	{
+	  *newoffset = cred->po->filepointer = offset;
+	  break;
+	}
+    default:
+      err = EINVAL;
+      break;
+    }
+
+  pthread_mutex_unlock (&np->lock);
+  return err;
+}