1 /* $OpenBSD: times.c,v 1.5 2005/08/08 08:05:34 espie Exp $ */
2 /*-
3 * Copyright (c) 1990, 1993
4 * The Regents of the University of California. All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * 3. Neither the name of the University nor the names of its contributors
15 * may be used to endorse or promote products derived from this software
16 * without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 * SUCH DAMAGE.
29 */
30
31 #include <sys/param.h>
32 #include <sys/time.h>
33 #include <sys/times.h>
34 #include <sys/resource.h>
35
36 /*
37 * Convert usec to clock ticks; could do (usec * CLK_TCK) / 1000000,
38 * but this would overflow if we switch to nanosec.
39 */
40 #define CONVTCK(r) (r.tv_sec * CLK_TCK + r.tv_usec / (1000000 / CLK_TCK))
41
42 clock_t
times(struct tms * tp)43 times(struct tms *tp)
44 {
45 struct rusage ru;
46 struct timeval t;
47
48 if (getrusage(RUSAGE_SELF, &ru) < 0)
49 return ((clock_t)-1);
50 tp->tms_utime = CONVTCK(ru.ru_utime);
51 tp->tms_stime = CONVTCK(ru.ru_stime);
52 if (getrusage(RUSAGE_CHILDREN, &ru) < 0)
53 return ((clock_t)-1);
54 tp->tms_cutime = CONVTCK(ru.ru_utime);
55 tp->tms_cstime = CONVTCK(ru.ru_stime);
56 if (gettimeofday(&t, (struct timezone *)0))
57 return ((clock_t)-1);
58 return ((clock_t)(CONVTCK(t)));
59 }
60