times.c revision 330897 
1/*-
2 * SPDX-License-Identifier: BSD-3-Clause
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 * 4. 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#if defined(LIBC_SCCS) && !defined(lint)
33static char sccsid[] = "@(#)times.c	8.1 (Berkeley) 6/4/93";
34#endif /* LIBC_SCCS and not lint */
35#include <sys/cdefs.h>
36__FBSDID("$FreeBSD: stable/11/lib/libc/gen/times.c 330897 2018-03-14 03:19:51Z eadler $");
37
38#include <sys/param.h>
39#include <sys/time.h>
40#include <sys/times.h>
41#include <sys/resource.h>
42
43/*
44 * Convert usec to clock ticks; could do (usec * CLK_TCK) / 1000000,
45 * but this would overflow if we switch to nanosec.
46 */
47#define	CONVTCK(r)	(r.tv_sec * CLK_TCK + r.tv_usec / (1000000 / CLK_TCK))
48
49clock_t
50times(tp)
51	struct tms *tp;
52{
53	struct rusage ru;
54	struct timespec t;
55	clock_t c;
56
57	if (getrusage(RUSAGE_SELF, &ru) < 0)
58		return ((clock_t)-1);
59	tp->tms_utime = CONVTCK(ru.ru_utime);
60	tp->tms_stime = CONVTCK(ru.ru_stime);
61	if (getrusage(RUSAGE_CHILDREN, &ru) < 0)
62		return ((clock_t)-1);
63	tp->tms_cutime = CONVTCK(ru.ru_utime);
64	tp->tms_cstime = CONVTCK(ru.ru_stime);
65	if (clock_gettime(CLOCK_MONOTONIC, &t))
66		return ((clock_t)-1);
67	c = t.tv_sec * CLK_TCK + t.tv_nsec / (1000000000 / CLK_TCK);
68	return (c);
69}
70