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 * 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/param.h>
33 #include <sys/time.h>
34 #include <sys/times.h>
35 #include <sys/resource.h>
36
37 /*
38 * Convert usec to clock ticks; could do (usec * CLK_TCK) / 1000000,
39 * but this would overflow if we switch to nanosec.
40 */
41 #define CONVTCK(r) (r.tv_sec * CLK_TCK + r.tv_usec / (1000000 / CLK_TCK))
42
43 clock_t
times(struct tms * tp)44 times(struct tms *tp)
45 {
46 struct rusage ru;
47 struct timespec t;
48 clock_t c;
49
50 if (getrusage(RUSAGE_SELF, &ru) < 0)
51 return ((clock_t)-1);
52 tp->tms_utime = CONVTCK(ru.ru_utime);
53 tp->tms_stime = CONVTCK(ru.ru_stime);
54 if (getrusage(RUSAGE_CHILDREN, &ru) < 0)
55 return ((clock_t)-1);
56 tp->tms_cutime = CONVTCK(ru.ru_utime);
57 tp->tms_cstime = CONVTCK(ru.ru_stime);
58 if (clock_gettime(CLOCK_MONOTONIC, &t))
59 return ((clock_t)-1);
60 c = t.tv_sec * CLK_TCK + t.tv_nsec / (1000000000 / CLK_TCK);
61 return (c);
62 }
63