Initial revision

1 files changed, 45 insertions, 0 deletions

diff --git a/gprof/hertz.c b/gprof/hertz.c
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+++ b/gprof/hertz.c
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+/*
+ * Copyright (c) 1983 Regents of the University of California.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms are permitted
+ * provided that: (1) source distributions retain this entire copyright
+ * notice and comment, and (2) distributions including binaries display
+ * the following acknowledgement:  ``This product includes software
+ * developed by the University of California, Berkeley and its contributors''
+ * in the documentation or other materials provided with the distribution
+ * and in all advertising materials mentioning features or use of this
+ * software. Neither the name of the University nor the names of its
+ * contributors may be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+ */
+
+#ifndef lint
+static char sccsid[] = "@(#)hertz.c	5.4 (Berkeley) 6/1/90";
+#endif /* not lint */
+
+#include <sys/time.h>
+
+    /*
+     *	discover the tick frequency of the machine
+     *	if something goes wrong, we return 0, an impossible hertz.
+     */
+#define	HZ_WRONG	0
+
+hertz()
+{
+	struct itimerval tim;
+
+	tim.it_interval.tv_sec = 0;
+	tim.it_interval.tv_usec = 1;
+	tim.it_value.tv_sec = 0;
+	tim.it_value.tv_usec = 0;
+	setitimer(ITIMER_REAL, &tim, 0);
+	setitimer(ITIMER_REAL, 0, &tim);
+	if (tim.it_interval.tv_usec < 2)
+		return(HZ_WRONG);
+	return (1000000 / tim.it_interval.tv_usec);
+}