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times.c revision 1.9 
      1 /*	$NetBSD: times.c,v 1.9 1999/09/16 11:45:05 lukem 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. All advertising materials mentioning features or use of this software
     16  *    must display the following acknowledgement:
     17  *	This product includes software developed by the University of
     18  *	California, Berkeley and its contributors.
     19  * 4. Neither the name of the University nor the names of its contributors
     20  *    may be used to endorse or promote products derived from this software
     21  *    without specific prior written permission.
     22  *
     23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     33  * SUCH DAMAGE.
     34  */
     35 
     36 #include <sys/cdefs.h>
     37 #if defined(LIBC_SCCS) && !defined(lint)
     38 #if 0
     39 static char sccsid[] = "@(#)times.c	8.1 (Berkeley) 6/4/93";
     40 #else
     41 __RCSID("$NetBSD: times.c,v 1.9 1999/09/16 11:45:05 lukem Exp $");
     42 #endif
     43 #endif /* LIBC_SCCS and not lint */
     44 
     45 #include "namespace.h"
     46 #include <sys/param.h>
     47 #include <sys/time.h>
     48 #include <sys/times.h>
     49 #include <sys/resource.h>
     50 
     51 #include <assert.h>
     52 #include <errno.h>
     53 #include <time.h>
     54 
     55 #ifdef __weak_alias
     56 __weak_alias(times,_times);
     57 #endif
     58 
     59 /*
     60  * Convert usec to clock ticks; could do (usec * CLK_TCK) / 1000000,
     61  * but this would overflow if we switch to nanosec.
     62  */
     63 #define	CONVTCK(r)	(r.tv_sec * CLK_TCK + r.tv_usec / (1000000 / CLK_TCK))
     64 
     65 clock_t
     66 times(tp)
     67 	struct tms *tp;
     68 {
     69 	struct rusage ru;
     70 	struct timeval t;
     71 
     72 	_DIAGASSERT(tp != NULL);
     73 #ifdef _DIAGNOSTIC
     74 	if (tp == NULL) {
     75 		errno = EFAULT;
     76 		return (-1);
     77 	}
     78 #endif
     79 
     80 	if (getrusage(RUSAGE_SELF, &ru) < 0)
     81 		return ((clock_t)-1);
     82 	tp->tms_utime = CONVTCK(ru.ru_utime);
     83 	tp->tms_stime = CONVTCK(ru.ru_stime);
     84 	if (getrusage(RUSAGE_CHILDREN, &ru) < 0)
     85 		return ((clock_t)-1);
     86 	tp->tms_cutime = CONVTCK(ru.ru_utime);
     87 	tp->tms_cstime = CONVTCK(ru.ru_stime);
     88 	if (gettimeofday(&t, (struct timezone *)0))
     89 		return ((clock_t)-1);
     90 	return ((clock_t)(CONVTCK(t)));
     91 }
     92