Attempt to use nvclock code for reading GPU temperature, since running

nvidia-settings couple of times for a second is highly inefficient.

nvclock/error.c

@@ -0,0 +1,63 @@
+/* NVClock 0.8 - Linux overclocker for NVIDIA cards
+ *
+ * site: http://nvclock.sourceforge.net
+ *
+ * Copyright(C) 2001-2004 Roderick Colenbrander
+ *
+ * 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 of the License, 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
+ */
+
+#include <sys/stat.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "nvclock.h"
+
+void set_error(int code)
+{
+	nvclock.nv_errno = code;
+}
+
+
+void set_error_str(const char *str)
+{
+	nvclock.nv_errno = NV_ERR_OTHER;
+
+	/* hacky; we need to think about memory management .. */
+	nvclock.nv_err_str = (char*)strdup(str);
+}
+
+
+char *get_error(char *buf, int size)
+{
+	switch(nvclock.nv_errno)
+	{
+		case NV_ERR_NO_DEVICES_FOUND:
+			strcpy(buf, "No nvidia cards found in your system!");
+			break;
+		case NV_ERR_NO_DRIVERS_FOUND:
+			strcpy(buf, "You don't have enough permissions to run NVClock! Retry as root or install the Nvidia drivers.");
+			break;
+		case NV_ERR_NOT_ENOUGH_PERMISSIONS:
+			strcpy(buf, "You don't have enough permissions to run NVClock! Retry as root.");
+			break;
+		case NV_ERR_OTHER:
+			strcpy(buf, nvclock.nv_err_str);
+			break;
+	}
+
+	return buf;
+}