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

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

nvclock/libc_wrapper.c

@@ -0,0 +1,67 @@
+/* Excerpt from: */
+
+/* $XFree86: xc/programs/Xserver/hw/xfree86/os-support/shared/libc_wrapper.c,v 1.70 2000/09/26 15:57:20 tsi Exp $ */
+/*
+ * Copyright 1997 by The XFree86 Project, Inc.
+ *
+ * Permission to use, copy, modify, distribute, and sell this software and its
+ * documentation for any purpose is hereby granted without fee, provided that
+ * the above copyright notice appear in all copies and that both that
+ * copyright notice and this permission notice appear in supporting
+ * documentation, and that the names of Orest Zborowski and David Wexelblat 
+ * not be used in advertising or publicity pertaining to distribution of 
+ * the software without specific, written prior permission.  Orest Zborowski
+ * and David Wexelblat make no representations about the suitability of this 
+ * software for any purpose.  It is provided "as is" without express or 
+ * implied warranty.
+ *
+ * THE XFREE86 PROJECT, INC. DISCLAIMS ALL WARRANTIES WITH REGARD 
+ * TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND 
+ * FITNESS, IN NO EVENT SHALL OREST ZBOROWSKI OR DAVID WEXELBLAT BE LIABLE 
+ * FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ */
+
+#include <stdio.h>
+#include "xfree.h"
+
+#ifdef HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+
+#include <sys/time.h>
+
+/* Misc functions. Some are ANSI C, some are not. */
+
+/* FIXME might use nanosleep (POSIX) here. */
+/* resolution of 1/HZ s (i.e, 10 ms on Linux/i386 and 1 ms on Linux/Alpha). */
+/* If  the process is scheduled under a real-time policy like
+       SCHED_FIFO or SCHED_RR, then pauses of up to 2 ms will  be
+       performed as busy waits with microsecond precision.
+*/
+
+void
+xf86usleep(usec)
+    unsigned long usec;
+{
+#if (defined(SYSV) || defined(SVR4)) && !defined(sun)
+	syscall(3112, (usec) / 1000 + 1);
+#else
+	usleep(usec);
+#endif
+}
+
+void xf86getsecs(long * secs, long * usecs)
+{
+	struct timeval tv;
+
+	gettimeofday(&tv, NULL);
+	*secs = tv.tv_sec;
+	*usecs= tv.tv_usec;
+
+	return;
+}
+