1 /* $OpenBSD: times.c,v 1.10 2020/07/06 13:33:06 pirofti 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/times.h>
32 #include <sys/resource.h>
33 #include <time.h>
34
35 /*
36 * Convert usec to clock ticks; could do (usec * CLK_TCK) / 1000000,
37 * but this would overflow if we switch to nanosec.
38 */
39 #define CONVTCK(r) (r.tv_sec * CLK_TCK + r.tv_usec / (1000000 / CLK_TCK))
40
41 clock_t
times(struct tms * tp)42 times(struct tms *tp)
43 {
44 struct rusage ru;
45 struct timespec ts;
46
47 if (getrusage(RUSAGE_SELF, &ru) == -1)
48 return ((clock_t)-1);
49 tp->tms_utime = CONVTCK(ru.ru_utime);
50 tp->tms_stime = CONVTCK(ru.ru_stime);
51 if (getrusage(RUSAGE_CHILDREN, &ru) == -1)
52 return ((clock_t)-1);
53 tp->tms_cutime = CONVTCK(ru.ru_utime);
54 tp->tms_cstime = CONVTCK(ru.ru_stime);
55 if (WRAP(clock_gettime)(CLOCK_MONOTONIC, &ts) == -1)
56 return ((clock_t)-1);
57 return (ts.tv_sec * CLK_TCK + ts.tv_nsec / (1000000000 / CLK_TCK));
58 }
59