src/usr.bin/gprof/hertz.c - diff

Return to hertz.c CVS log

Up to [local] / src / usr.bin / gprof

Diff for /src/usr.bin/gprof/hertz.c between version 1.4 and 1.5

-version 1.4, 2003/06/03 02:56:08
+version 1.5, 2005/05/03 08:08:53
 Line 1
 Line 1
 Line 1
  /*      $OpenBSD$       */
- /*      $NetBSD: hertz.c,v 1.5 1995/04/19 07:16:03 cgd Exp $    */
  /*
-  * Copyright (c) 1983, 1993
+  * Copyright (c) 2005 Artur Grabowski <art@openbsd.org>
-  *      The Regents of the University of California.  All rights reserved.
   *
-  * Redistribution and use in source and binary forms, with or without
+  * Permission to use, copy, modify, and distribute this software for any
-  * modification, are permitted provided that the following conditions
+  * purpose with or without fee is hereby granted, provided that the above
-  * are met:
+  * copyright notice and this permission notice appear in all copies.
-  * 1. Redistributions of source code must retain the above copyright
-  *    notice, this list of conditions and the following disclaimer.
-  * 2. Redistributions in binary form must reproduce the above copyright
-  *    notice, this list of conditions and the following disclaimer in the
-  *    documentation and/or other materials provided with the distribution.
-  * 3. 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 BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
-  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
-  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
-  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
-  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
-  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
-  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
-  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
-  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
-  * SUCH DAMAGE.
   */
- #ifndef lint
- #if 0
- static char sccsid[] = "@(#)hertz.c     8.1 (Berkeley) 6/6/93";
- #else
- static char rcsid[] = "$OpenBSD$";
- #endif
- #endif /* not lint */
+ #include <sys/param.h>
  #include <sys/time.h>
+ #include <sys/sysctl.h>
-     /*
+ /*
-      *  discover the tick frequency of the machine
+  * Return the tick frequency on the machine or 0 if we can't find out.
-      *  if something goes wrong, we return 0, an impossible hertz.
+  */
-      */
- #define HZ_WRONG        0
  int
- hertz()
+ hertz(void)
  {
-         struct itimerval tim;
+         struct clockinfo cinfo;
+         int mib[2];
+         size_t len;
-         tim.it_interval.tv_sec = 0;
+         mib[0] = CTL_KERN;
-         tim.it_interval.tv_usec = 1;
+         mib[1] = KERN_CLOCKRATE;
-         tim.it_value.tv_sec = 0;
+         len = sizeof(cinfo);
-         tim.it_value.tv_usec = 0;
+         if (sysctl(mib, 2, &cinfo, &len, NULL, 0) == -1)
-         setitimer(ITIMER_REAL, &tim, 0);
+                 return (0);
-         setitimer(ITIMER_REAL, 0, &tim);
-         if (tim.it_interval.tv_usec < 2)
+         return (cinfo.hz);
-                 return(HZ_WRONG);
-         return (1000000 / tim.it_interval.tv_usec);
  }