projects/linux·blob master · refs

119 lines · 2.5 KiB

1// SPDX-License-Identifier: GPL-2.0
2
3#include <subcmd/parse-options.h>
4#include <stdio.h>
5#include <time.h>
6#include <strings.h>
7#include <linux/time64.h>
8#include "debug.h"
9#include "clockid.h"
10#include "record.h"
11
12struct clockid_map {
13 const char *name;
14 int clockid;
15};
16
17#define CLOCKID_MAP(n, c) \
18 { .name = n, .clockid = (c), }
19
20#define CLOCKID_END { .name = NULL, }
21
22
23/*
24 * Add the missing ones, we need to build on many distros...
25 */
26#ifndef CLOCK_MONOTONIC_RAW
27#define CLOCK_MONOTONIC_RAW 4
28#endif
29#ifndef CLOCK_BOOTTIME
30#define CLOCK_BOOTTIME 7
31#endif
32#ifndef CLOCK_TAI
33#define CLOCK_TAI 11
34#endif
35
36static const struct clockid_map clockids[] = {
37 /* available for all events, NMI safe */
38 CLOCKID_MAP("monotonic", CLOCK_MONOTONIC),
39 CLOCKID_MAP("monotonic_raw", CLOCK_MONOTONIC_RAW),
40
41 /* available for some events */
42 CLOCKID_MAP("realtime", CLOCK_REALTIME),
43 CLOCKID_MAP("boottime", CLOCK_BOOTTIME),
44 CLOCKID_MAP("tai", CLOCK_TAI),
45
46 /* available for the lazy */
47 CLOCKID_MAP("mono", CLOCK_MONOTONIC),
48 CLOCKID_MAP("raw", CLOCK_MONOTONIC_RAW),
49 CLOCKID_MAP("real", CLOCK_REALTIME),
50 CLOCKID_MAP("boot", CLOCK_BOOTTIME),
51
52 CLOCKID_END,
53};
54
55static int get_clockid_res(clockid_t clk_id, u64 *res_ns)
56{
57 struct timespec res;
58
59 *res_ns = 0;
60 if (!clock_getres(clk_id, &res))
61 *res_ns = res.tv_nsec + res.tv_sec * NSEC_PER_SEC;
62 else
63 pr_warning("WARNING: Failed to determine specified clock resolution.\n");
64
65 return 0;
66}
67
68int parse_clockid(const struct option *opt, const char *str, int unset)
69{
70 struct record_opts *opts = (struct record_opts *)opt->value;
71 const struct clockid_map *cm;
72 const char *ostr = str;
73
74 if (unset) {
75 opts->use_clockid = 0;
76 return 0;
77 }
78
79 /* no arg passed */
80 if (!str)
81 return 0;
82
83 /* no setting it twice */
84 if (opts->use_clockid)
85 return -1;
86
87 opts->use_clockid = true;
88
89 /* if its a number, we're done */
90 if (sscanf(str, "%d", &opts->clockid) == 1)
91 return get_clockid_res(opts->clockid, &opts->clockid_res_ns);
92
93 /* allow a "CLOCK_" prefix to the name */
94 if (!strncasecmp(str, "CLOCK_", 6))
95 str += 6;
96
97 for (cm = clockids; cm->name; cm++) {
98 if (!strcasecmp(str, cm->name)) {
99 opts->clockid = cm->clockid;
100 return get_clockid_res(opts->clockid,
101 &opts->clockid_res_ns);
102 }
103 }
104
105 opts->use_clockid = false;
106 ui__warning("unknown clockid %s, check man page\n", ostr);
107 return -1;
108}
109
110const char *clockid_name(clockid_t clk_id)
111{
112 const struct clockid_map *cm;
113
114 for (cm = clockids; cm->name; cm++) {
115 if (cm->clockid == clk_id)
116 return cm->name;
117 }
118 return "(not found)";
119}