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      1 /*	$NetBSD: times.c,v 1.15 2009/01/11 02:46:27 christos Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 1990, 1993
      5  *	The Regents of the University of California.  All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  * 3. Neither the name of the University nor the names of its contributors
     16  *    may be used to endorse or promote products derived from this software
     17  *    without specific prior written permission.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     29  * SUCH DAMAGE.
     30  */
     31 
     32 #include <sys/cdefs.h>
     33 #if defined(LIBC_SCCS) && !defined(lint)
     34 #if 0
     35 static char sccsid[] = "@(#)times.c	8.1 (Berkeley) 6/4/93";
     36 #else
     37 __RCSID("$NetBSD: times.c,v 1.15 2009/01/11 02:46:27 christos Exp $");
     38 #endif
     39 #endif /* LIBC_SCCS and not lint */
     40 
     41 #include "namespace.h"
     42 #include <sys/param.h>
     43 #include <sys/time.h>
     44 #include <sys/times.h>
     45 #include <sys/resource.h>
     46 
     47 #include <assert.h>
     48 #include <errno.h>
     49 #include <time.h>
     50 
     51 /*
     52  * Convert usec to clock ticks; could do (usec * CLK_TCK) / 1000000,
     53  * but this would overflow if we switch to nanosec.
     54  */
     55 #define	CONVTCK(r)	\
     56     (clock_t)(r.tv_sec * clk_tck + r.tv_usec / (1000000 / (uint)clk_tck))
     57 
     58 #ifndef __times_rusage
     59 #define __times_rusage struct rusage
     60 #endif
     61 #ifndef __times_timeval
     62 #define __times_timeval struct timeval
     63 #endif
     64 
     65 clock_t
     66 times(struct tms *tp)
     67 {
     68 	__times_rusage ru;
     69 	__times_timeval t;
     70 	static clock_t clk_tck;
     71 
     72 	_DIAGASSERT(tp != NULL);
     73 
     74 	/*
     75 	 * we use a local copy of CLK_TCK because it expands to a
     76 	 * moderately expensive function call.
     77 	 */
     78 	if (clk_tck == 0)
     79 		clk_tck = (clock_t)CLK_TCK;
     80 
     81 	if (getrusage(RUSAGE_SELF, &ru) < 0)
     82 		return ((clock_t)-1);
     83 	tp->tms_utime = CONVTCK(ru.ru_utime);
     84 	tp->tms_stime = CONVTCK(ru.ru_stime);
     85 	if (getrusage(RUSAGE_CHILDREN, &ru) < 0)
     86 		return ((clock_t)-1);
     87 	tp->tms_cutime = CONVTCK(ru.ru_utime);
     88 	tp->tms_cstime = CONVTCK(ru.ru_stime);
     89 	if (gettimeofday(&t, (struct timezone *)0))
     90 		return ((clock_t)-1);
     91 	return ((clock_t)(CONVTCK(t)));
     92 }
     93