1 /*
2 * This file and its contents are supplied under the terms of the
3 * Common Development and Distribution License ("CDDL"), version 1.0.
4 * You may only use this file in accordance with the terms of version
5 * 1.0 of the CDDL.
6 *
7 * A full copy of the text of the CDDL should have accompanied this
8 * source. A copy of the CDDL is also available via the Internet at
9 * http://www.illumos.org/license/CDDL.
10 */
11
12 /*
13 * Copyright (c) 2015 Joyent, Inc.
14 * Copyright 2025 Oxide Computer Company
15 */
16
17 /*
18 * Implementation of C11 and C23 timespec_*() functions. Note, the standard does
19 * not have us return values of errno if there are failures for whatever reason,
20 * only zero. At least we don't have to preserve errno though.
21 */
22
23 #include <time.h>
24 #include <stdbool.h>
25
26 static bool
timespec_base_to_clock(int base,clockid_t * clock)27 timespec_base_to_clock(int base, clockid_t *clock)
28 {
29 switch (base) {
30 case TIME_UTC:
31 *clock = CLOCK_REALTIME;
32 break;
33 case TIME_MONOTONIC:
34 *clock = CLOCK_HIGHRES;
35 break;
36 case TIME_ACTIVE:
37 *clock = CLOCK_PROCESS_CPUTIME_ID;
38 break;
39 case TIME_THREAD_ACTIVE:
40 *clock = CLOCK_THREAD_CPUTIME_ID;
41 break;
42 case TIME_THREAD_ACTIVE_USR:
43 *clock = CLOCK_VIRTUAL;
44 break;
45 default:
46 return (false);
47 }
48
49 return (true);
50 }
51
52 int
timespec_get(struct timespec * ts,int base)53 timespec_get(struct timespec *ts, int base)
54 {
55 clockid_t clock;
56
57 if (!timespec_base_to_clock(base, &clock))
58 return (0);
59
60 if (clock_gettime(clock, ts) != 0)
61 return (0);
62
63 return (base);
64 }
65
66 int
timespec_getres(struct timespec * ts,int base)67 timespec_getres(struct timespec *ts, int base)
68 {
69 clockid_t clock;
70
71 if (!timespec_base_to_clock(base, &clock))
72 return (0);
73
74 if (clock_getres(clock, ts) != 0)
75 return (0);
76
77 return (base);
78 }
79