120 lines · c
1// SPDX-License-Identifier: GPL-2.02 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_RAW27#define CLOCK_MONOTONIC_RAW 428#endif29#ifndef CLOCK_BOOTTIME30#define CLOCK_BOOTTIME 731#endif32#ifndef CLOCK_TAI33#define CLOCK_TAI 1134#endif35 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 else63 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}120