1 files changed, 54 insertions, 0 deletions
diff --git a/gprof/hertz.c b/gprof/hertz.c
new file mode 100644
index 0000000..75314ac
--- /dev/null
+++ b/gprof/hertz.c
@@ -0,0 +1,54 @@
+/*
+ * 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.
+ */
+#include "hertz.h"
+
+
+#ifdef __MSDOS__
+#define HERTZ 18
+#endif
+
+int
+hertz ()
+{
+#ifdef HERTZ
+  return HERTZ;
+#else /* ! defined (HERTZ) */
+#ifdef HAVE_SETITIMER
+  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;
+#else /* ! defined (HAVE_SETITIMER) */
+#if defined (HAVE_SYSCONF) && defined (_SC_CLK_TCK)
+  return sysconf (_SC_CLK_TCK);
+#else /* ! defined (HAVE_SYSCONF) || ! defined (_SC_CLK_TCK) */
+  return HZ_WRONG;
+#endif /* ! defined (HAVE_SYSCONF) || ! defined (_SC_CLK_TCK) */
+#endif /* ! defined (HAVE_SETITIMER) */
+#endif /* ! defined (HERTZ) */
+}