misc-utils/lsclocks.c

   1 /*
   2  * lsclocks(1) - display system clocks
   3  *
   4  * Copyright (C) 2023 Thomas Weißschuh <thomas@t-8ch.de>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it would be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License along
  17  * with this program; if not, write to the Free Software Foundation, Inc.,
  18  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  19  */
  20
  21 #include <stdio.h>
  22 #include <stdbool.h>
  23 #include <time.h>
  24 #include <inttypes.h>
  25 #include <getopt.h>
  26 #include <glob.h>
  27 #include <sys/ioctl.h>
  28
  29 #include <libsmartcols.h>
  30
  31 #include <linux/rtc.h>
  32
  33 #include "c.h"
  34 #include "nls.h"
  35 #include "strutils.h"
  36 #include "timeutils.h"
  37 #include "closestream.h"
  38 #include "xalloc.h"
  39 #include "pathnames.h"
  40 #include "all-io.h"
  41 #include "list.h"
  42
  43 #ifndef CLOCK_REALTIME
  44 #define CLOCK_REALTIME                  0
  45 #endif
  46
  47 #ifndef CLOCK_MONOTONIC
  48 #define CLOCK_MONOTONIC                 1
  49 #endif
  50
  51 #ifndef CLOCK_MONOTONIC_RAW
  52 #define CLOCK_MONOTONIC_RAW             4
  53 #endif
  54
  55 #ifndef CLOCK_REALTIME_COARSE
  56 #define CLOCK_REALTIME_COARSE           5
  57 #endif
  58
  59 #ifndef CLOCK_MONOTONIC_COARSE
  60 #define CLOCK_MONOTONIC_COARSE          6
  61 #endif
  62
  63 #ifndef CLOCK_BOOTTIME
  64 #define CLOCK_BOOTTIME                  7
  65 #endif
  66
  67 #ifndef CLOCK_REALTIME_ALARM
  68 #define CLOCK_REALTIME_ALARM            8
  69 #endif
  70
  71 #ifndef CLOCK_BOOTTIME_ALARM
  72 #define CLOCK_BOOTTIME_ALARM            9
  73 #endif
  74
  75 #ifndef CLOCK_TAI
  76 #define CLOCK_TAI                       11
  77 #endif
  78
  79 enum CLOCK_TYPE {
  80         CT_SYS,
  81         CT_PTP,
  82         CT_CPU,
  83         CT_RTC,
  84 };
  85
  86 static const char *clock_type_name(enum CLOCK_TYPE type)
  87 {
  88         switch (type) {
  89         case CT_SYS:
  90                 return "sys";
  91         case CT_PTP:
  92                 return "ptp";
  93         case CT_CPU:
  94                 return "cpu";
  95         case CT_RTC:
  96                 return "rtc";
  97         }
  98         errx(EXIT_FAILURE, _("Unknown clock type %d"), type);
  99 }
 100
 101 struct clockinfo {
 102         enum CLOCK_TYPE type;
 103         clockid_t id;
 104         const char * const id_name;
 105         const char * const name;
 106         const char * const ns_offset_name;
 107         bool no_id;
 108 };
 109
 110 static const struct clockinfo clocks[] = {
 111         { CT_SYS, CLOCK_REALTIME,         "CLOCK_REALTIME",         "realtime"         },
 112         { CT_SYS, CLOCK_MONOTONIC,        "CLOCK_MONOTONIC",        "monotonic",
 113           .ns_offset_name = "monotonic"                                                },
 114         { CT_SYS, CLOCK_MONOTONIC_RAW,    "CLOCK_MONOTONIC_RAW",    "monotonic-raw"    },
 115         { CT_SYS, CLOCK_REALTIME_COARSE,  "CLOCK_REALTIME_COARSE",  "realtime-coarse"  },
 116         { CT_SYS, CLOCK_MONOTONIC_COARSE, "CLOCK_MONOTONIC_COARSE", "monotonic-coarse" },
 117         { CT_SYS, CLOCK_BOOTTIME,         "CLOCK_BOOTTIME",         "boottime",
 118           .ns_offset_name = "boottime"                                                 },
 119         { CT_SYS, CLOCK_REALTIME_ALARM,   "CLOCK_REALTIME_ALARM",   "realtime-alarm"   },
 120         { CT_SYS, CLOCK_BOOTTIME_ALARM,   "CLOCK_BOOTTIME_ALARM",   "boottime-alarm"   },
 121         { CT_SYS, CLOCK_TAI,              "CLOCK_TAI",              "tai"              },
 122 };
 123
 124 /* column IDs */
 125 enum {
 126         COL_TYPE,
 127         COL_ID,
 128         COL_CLOCK,
 129         COL_NAME,
 130         COL_TIME,
 131         COL_ISO_TIME,
 132         COL_RESOL,
 133         COL_RESOL_RAW,
 134         COL_REL_TIME,
 135         COL_NS_OFFSET,
 136 };
 137
 138 /* column names */
 139 struct colinfo {
 140         const char * const      name; /* header */
 141         double                  whint; /* width hint (N < 1 is in percent of termwidth) */
 142         int                     flags; /* SCOLS_FL_* */
 143         int                     json_type; /* SCOLS_JSON_* */
 144         const char * const      help;
 145 };
 146
 147 /* columns descriptions */
 148 static const struct colinfo infos[] = {
 149         [COL_TYPE]       = { "TYPE",       1, 0,              SCOLS_JSON_STRING, N_("type") },
 150         [COL_ID]         = { "ID",         1, SCOLS_FL_RIGHT, SCOLS_JSON_NUMBER, N_("numeric id") },
 151         [COL_CLOCK]      = { "CLOCK",      1, 0,              SCOLS_JSON_STRING, N_("symbolic name") },
 152         [COL_NAME]       = { "NAME",       1, 0,              SCOLS_JSON_STRING, N_("readable name") },
 153         [COL_TIME]       = { "TIME",       1, SCOLS_FL_RIGHT, SCOLS_JSON_NUMBER, N_("numeric time") },
 154         [COL_ISO_TIME]   = { "ISO_TIME",   1, SCOLS_FL_RIGHT, SCOLS_JSON_STRING, N_("human readable ISO time") },
 155         [COL_RESOL]      = { "RESOL",      1, SCOLS_FL_RIGHT, SCOLS_JSON_STRING, N_("human readable resolution") },
 156         [COL_RESOL_RAW]  = { "RESOL_RAW",  1, SCOLS_FL_RIGHT, SCOLS_JSON_NUMBER, N_("resolution") },
 157         [COL_REL_TIME]   = { "REL_TIME",   1, SCOLS_FL_RIGHT, SCOLS_JSON_STRING, N_("human readable relative time") },
 158         [COL_NS_OFFSET]  = { "NS_OFFSET",  1, SCOLS_FL_RIGHT, SCOLS_JSON_NUMBER, N_("namespace offset") },
 159 };
 160
 161 static int column_name_to_id(const char *name, size_t namesz)
 162 {
 163         size_t i;
 164
 165         for (i = 0; i < ARRAY_SIZE(infos); i++) {
 166                 const char *cn = infos[i].name;
 167
 168                 if (!strncasecmp(name, cn, namesz) && !*(cn + namesz))
 169                         return i;
 170         }
 171         warnx(_("unknown column: %s"), name);
 172
 173         return -1;
 174 }
 175
 176 static void __attribute__((__noreturn__)) usage(void)
 177 {
 178         FILE *out = stdout;
 179         size_t i;
 180
 181         fputs(USAGE_HEADER, out);
 182         fprintf(out, _(" %s [options]\n"), program_invocation_short_name);
 183
 184         fputs(USAGE_OPTIONS, out);
 185         fputs(_(" -J, --json                 use JSON output format\n"), out);
 186         fputs(_(" -n, --noheadings           don't print headings\n"), out);
 187         fputs(_(" -o, --output <list>        output columns\n"), out);
 188         fputs(_("     --output-all           output all columns\n"), out);
 189         fputs(_(" -r, --raw                  use raw output format\n"), out);
 190         fputs(_(" -t, --time <clock>         show current time of single clock\n"), out);
 191         fputs(_(" --no-discover-dynamic      do not try to discover dynamic clocks\n"), out);
 192         fputs(_(" -d, --dynamic-clock <path> also display specified dynamic clock\n"), out);
 193         fputs(_(" -c, --cpu-clock <pid>      also display CPU clock of specified process\n"), out);
 194
 195         fputs(USAGE_SEPARATOR, out);
 196         fprintf(out, USAGE_HELP_OPTIONS(29));
 197
 198         fputs(USAGE_COLUMNS, out);
 199
 200         for (i = 0; i < ARRAY_SIZE(infos); i++)
 201                 fprintf(out, " %16s  %-10s%s\n", infos[i].name,
 202                         infos[i].json_type == SCOLS_JSON_STRING?  "<string>":
 203                         infos[i].json_type == SCOLS_JSON_ARRAY_STRING?  "<string>":
 204                         infos[i].json_type == SCOLS_JSON_ARRAY_NUMBER?  "<string>":
 205                         infos[i].json_type == SCOLS_JSON_NUMBER?  "<number>":
 206                         "<boolean>",
 207                         _(infos[i].help));
 208
 209         fprintf(out, USAGE_MAN_TAIL("lsclocks(1)"));
 210
 211         exit(EXIT_SUCCESS);
 212 }
 213
 214 __attribute__ ((__format__ (__printf__, 3, 4)))
 215 static void scols_line_asprintf(struct libscols_line *ln, size_t n, const char *format, ...)
 216 {
 217         char *data;
 218         va_list args;
 219
 220         va_start(args, format);
 221         xvasprintf(&data, format, args);
 222         va_end(args);
 223
 224         scols_line_refer_data(ln, n, data);
 225 }
 226
 227 static void scols_line_format_timespec(struct libscols_line *ln, size_t n, const struct timespec *ts)
 228 {
 229         scols_line_asprintf(ln, n, "%ju.%09" PRId32, (uintmax_t) ts->tv_sec, (uint32_t) ts->tv_nsec);
 230 }
 231
 232 static clockid_t parse_clock(const char *name)
 233 {
 234         size_t i;
 235         uint32_t id = -1;
 236         int rc;
 237
 238         rc = ul_strtou32(name, &id, 10);
 239
 240         for (i = 0; i < ARRAY_SIZE(clocks); i++) {
 241                 if (!strcmp(name, clocks[i].id_name)
 242                     || !strcmp(name, clocks[i].name))
 243                         return clocks[i].id;
 244                 if (rc == 0 && (clockid_t) id == clocks[i].id)
 245                         return id;
 246         }
 247
 248         errx(EXIT_FAILURE, _("Unknown clock: %s"), name);
 249 }
 250
 251 static int64_t get_namespace_offset(const char *name)
 252 {
 253         char *tokstr, *buf, *saveptr, *line, *space;
 254         uint64_t ret;
 255         int fd;
 256
 257         fd = open(_PATH_PROC_TIMENS_OFF, O_RDONLY);
 258         if (fd == -1)
 259                 err(EXIT_FAILURE, _("Could not open %s"), _PATH_PROC_TIMENS_OFF);
 260
 261         read_all_alloc(fd, &buf);
 262
 263         for (tokstr = buf; ; tokstr = NULL) {
 264                 line = strtok_r(tokstr, "\n", &saveptr);
 265                 if (!line)
 266                         continue;
 267                 line = (char *) startswith(line, name);
 268                 if (!line || line[0] != ' ')
 269                         continue;
 270
 271                 line = (char *) skip_blank(line);
 272                 space = strchr(line, ' ');
 273                 if (space)
 274                         *space = '\0';
 275                 ret = strtos64_or_err(line, _("Invalid offset"));
 276                 break;
 277         }
 278
 279         free(buf);
 280         return ret;
 281 }
 282
 283 static void add_clock_line(struct libscols_table *tb, const int *columns,
 284                            size_t ncolumns, const struct clockinfo *clockinfo,
 285                            const struct timespec *now, const struct timespec *resolution)
 286 {
 287         char buf[FORMAT_TIMESTAMP_MAX];
 288         struct libscols_line *ln;
 289         size_t i;
 290         int rc;
 291
 292         ln = scols_table_new_line(tb, NULL);
 293         if (!ln)
 294                 errx(EXIT_FAILURE, _("failed to allocate output line"));
 295
 296         for (i = 0; i < ncolumns; i++) {
 297                 switch (columns[i]) {
 298                         case COL_TYPE:
 299                                 scols_line_set_data(ln, i, clock_type_name(clockinfo->type));
 300                                 break;
 301                         case COL_ID:
 302                                 if (!clockinfo->no_id)
 303                                         scols_line_asprintf(ln, i, "%ju", (uintmax_t) clockinfo->id);
 304                                 break;
 305                         case COL_CLOCK:
 306                                 scols_line_set_data(ln, i, clockinfo->id_name);
 307                                 break;
 308                         case COL_NAME:
 309                                 scols_line_set_data(ln, i, clockinfo->name);
 310                                 break;
 311                         case COL_TIME:
 312                                 if (now->tv_nsec == -1)
 313                                         break;
 314
 315                                 scols_line_format_timespec(ln, i, now);
 316                                 break;
 317                         case COL_ISO_TIME:
 318                                 if (now->tv_nsec == -1)
 319                                         break;
 320
 321                                 rc = strtimespec_iso(now,
 322                                                 ISO_GMTIME | ISO_DATE | ISO_TIME | ISO_T | ISO_DOTNSEC | ISO_TIMEZONE,
 323                                                 buf, sizeof(buf));
 324                                 if (rc)
 325                                         errx(EXIT_FAILURE, _("failed to format iso time"));
 326                                 scols_line_set_data(ln, i, buf);
 327                                 break;
 328                         case COL_RESOL:
 329                                 if (resolution->tv_nsec == -1)
 330                                         break;
 331
 332                                 rc = strtimespec_relative(resolution, buf, sizeof(buf));
 333                                 if (rc)
 334                                         errx(EXIT_FAILURE, _("failed to format relative time"));
 335                                 scols_line_set_data(ln, i, buf);
 336                                 break;
 337                         case COL_RESOL_RAW:
 338                                 if (resolution->tv_nsec == -1)
 339                                         break;
 340                                 scols_line_format_timespec(ln, i, resolution);
 341                                 break;
 342                         case COL_REL_TIME:
 343                                 if (now->tv_nsec == -1)
 344                                         break;
 345                                 rc = strtimespec_relative(now, buf, sizeof(buf));
 346                                 if (rc)
 347                                         errx(EXIT_FAILURE, _("failed to format relative time"));
 348                                 scols_line_set_data(ln, i, buf);
 349                                 break;
 350                         case COL_NS_OFFSET:
 351                                 if (clockinfo->ns_offset_name)
 352                                         scols_line_asprintf(ln, i, "%"PRId64,
 353                                                             get_namespace_offset(clockinfo->ns_offset_name));
 354                                 break;
 355                 }
 356         }
 357 }
 358
 359 static void add_posix_clock_line(struct libscols_table *tb, const int *columns,
 360                                  size_t ncolumns, const struct clockinfo *clockinfo)
 361 {
 362         struct timespec resolution, now;
 363         int rc;
 364
 365         rc = clock_gettime(clockinfo->id, &now);
 366         if (rc)
 367                 now.tv_nsec = -1;
 368
 369         rc = clock_getres(clockinfo->id, &resolution);
 370         if (rc)
 371                 resolution.tv_nsec = -1;
 372
 373         add_clock_line(tb, columns, ncolumns, clockinfo, &now, &resolution);
 374 }
 375
 376 struct path_clock {
 377         struct list_head head;
 378         const char * path;
 379 };
 380
 381 static void add_dynamic_clock_from_path(struct libscols_table *tb,
 382                                         const int *columns, size_t ncolumns,
 383                                         const char *path, bool explicit)
 384 {
 385         int fd = open(path, O_RDONLY);
 386         if (fd == -1) {
 387                 if (explicit)
 388                         err(EXIT_FAILURE, _("Could not open %s"), path);
 389                 else
 390                         return;
 391         }
 392
 393         struct clockinfo clockinfo = {
 394                 .type = CT_PTP,
 395                 .no_id = true,
 396                 .id_name = path,
 397                 .name = path,
 398         };
 399         add_posix_clock_line(tb, columns, ncolumns, &clockinfo);
 400         close(fd);
 401 }
 402
 403 static void add_dynamic_clocks_from_discovery(struct libscols_table *tb,
 404                                               const int *columns, size_t ncolumns)
 405 {
 406         int rc;
 407         size_t i;
 408         glob_t state;
 409
 410         rc = glob("/dev/ptp*", 0, NULL, &state);
 411         if (rc == GLOB_NOMATCH)
 412                 return;
 413         else if (rc)
 414                 errx(EXIT_FAILURE, _("Could not glob: %d"), rc);
 415
 416         for (i = 0; i < state.gl_pathc; i++)
 417                 add_dynamic_clock_from_path(tb, columns, ncolumns,
 418                                             state.gl_pathv[i], false);
 419
 420         globfree(&state);
 421 }
 422
 423 static void add_rtc_clock_from_path(struct libscols_table *tb,
 424                                     const int *columns, size_t ncolumns,
 425                                     const char *path, bool explicit)
 426 {
 427         int fd, rc;
 428         struct rtc_time rtc_time;
 429         struct tm tm = { 0 };
 430         struct timespec now = { 0 }, resolution = { .tv_nsec = -1 };
 431
 432         fd = open(path, O_RDONLY);
 433         if (fd == -1) {
 434                 if (explicit)
 435                         err(EXIT_FAILURE, _("Could not open %s"), path);
 436                 else
 437                         return;
 438         }
 439
 440         rc = ioctl(fd, RTC_RD_TIME, &rtc_time);
 441         if (rc)
 442                 err(EXIT_FAILURE,
 443                     _("ioctl(RTC_RD_NAME) to %s to read the time failed"), path);
 444
 445         tm.tm_sec  = rtc_time.tm_sec;
 446         tm.tm_min  = rtc_time.tm_min;
 447         tm.tm_hour = rtc_time.tm_hour;
 448         tm.tm_mday = rtc_time.tm_mday;
 449         tm.tm_mon  = rtc_time.tm_mon;
 450         tm.tm_year = rtc_time.tm_year;
 451         tm.tm_wday = rtc_time.tm_wday;
 452         tm.tm_yday = rtc_time.tm_yday;
 453
 454         now.tv_sec = mktime(&tm);
 455
 456         struct clockinfo clockinfo = {
 457                 .type = CT_RTC,
 458                 .no_id = true,
 459                 .id_name = path,
 460                 .name = path,
 461         };
 462         add_clock_line(tb, columns, ncolumns, &clockinfo, &now, &resolution);
 463
 464         close(fd);
 465 }
 466
 467 static void add_rtc_clocks_from_discovery(struct libscols_table *tb,
 468                                           const int *columns, size_t ncolumns)
 469 {
 470         int rc;
 471         size_t i;
 472         glob_t state;
 473
 474         rc = glob("/dev/rtc*", 0, NULL, &state);
 475         if (rc == GLOB_NOMATCH)
 476                 return;
 477         if (rc)
 478                 errx(EXIT_FAILURE, _("Could not glob: %d"), rc);
 479
 480         for (i = 0; i < state.gl_pathc; i++)
 481                 add_rtc_clock_from_path(tb, columns, ncolumns,
 482                                             state.gl_pathv[i], false);
 483
 484         globfree(&state);
 485 }
 486
 487 struct cpu_clock {
 488         struct list_head head;
 489         pid_t pid;
 490         char name[sizeof(stringify_value(SINT_MAX(pid_t)))];
 491 };
 492
 493 static void add_cpu_clock(struct libscols_table *tb,
 494                           const int *columns, size_t ncolumns,
 495                           pid_t pid, const char *name)
 496 {
 497         int rc;
 498         clockid_t clockid;
 499
 500         rc = clock_getcpuclockid(pid, &clockid);
 501         if (rc)
 502                 errx(EXIT_FAILURE, _("Could not get CPU clock of process %jd: %s"),
 503                                    (intmax_t) pid, strerror(rc));
 504
 505         struct clockinfo clockinfo = {
 506                 .type = CT_CPU,
 507                 .name = name,
 508                 .no_id = true,
 509         };
 510         add_posix_clock_line(tb, columns, ncolumns, &clockinfo);
 511 }
 512
 513
 514 int main(int argc, char **argv)
 515 {
 516         size_t i;
 517         int c, rc;
 518         const struct colinfo *colinfo;
 519
 520         struct libscols_table *tb;
 521         struct libscols_column *col;
 522
 523         bool noheadings = false, raw = false, json = false,
 524              disc_dynamic = true, disc_rtc = true;
 525         const char *outarg = NULL;
 526         int columns[ARRAY_SIZE(infos) * 2];
 527         size_t ncolumns = 0;
 528         clockid_t clock = -1;
 529         struct path_clock *path_clock;
 530         struct cpu_clock *cpu_clock;
 531         struct list_head *current_path_clock, *current_cpu_clock;
 532         struct list_head dynamic_clocks, cpu_clocks, rtc_clocks;
 533
 534         struct timespec now;
 535
 536         enum {
 537                 OPT_OUTPUT_ALL = CHAR_MAX + 1,
 538                 OPT_NO_DISC_DYN,
 539                 OPT_NO_DISC_RTC,
 540         };
 541         static const struct option longopts[] = {
 542                 { "noheadings",          no_argument,       NULL, 'n' },
 543                 { "output",              required_argument, NULL, 'o' },
 544                 { "output-all",          no_argument,       NULL, OPT_OUTPUT_ALL },
 545                 { "version",             no_argument,       NULL, 'V' },
 546                 { "help",                no_argument,       NULL, 'h' },
 547                 { "json",                no_argument,       NULL, 'J' },
 548                 { "raw",                 no_argument,       NULL, 'r' },
 549                 { "time",                required_argument, NULL, 't' },
 550                 { "no-discover-dynamic", no_argument,       NULL, OPT_NO_DISC_DYN },
 551                 { "dynamic-clock",       required_argument, NULL, 'd' },
 552                 { "cpu-clock",           required_argument, NULL, 'c' },
 553                 { "no-discover-rtc",     no_argument,       NULL, OPT_NO_DISC_RTC },
 554                 { "rtc",                 required_argument, NULL, 'x' },
 555                 { 0 }
 556         };
 557
 558         setlocale(LC_ALL, "");
 559         bindtextdomain(PACKAGE, LOCALEDIR);
 560         textdomain(PACKAGE);
 561         close_stdout_atexit();
 562
 563         INIT_LIST_HEAD(&dynamic_clocks);
 564         INIT_LIST_HEAD(&cpu_clocks);
 565         INIT_LIST_HEAD(&rtc_clocks);
 566
 567         while ((c = getopt_long(argc, argv, "no:Jrt:d:c:x:Vh", longopts, NULL)) != -1) {
 568                 switch (c) {
 569                 case 'n':
 570                         noheadings = true;
 571                         break;
 572                 case 'o':
 573                         outarg = optarg;
 574                         break;
 575                 case OPT_OUTPUT_ALL:
 576                         for (ncolumns = 0; ncolumns < ARRAY_SIZE(infos); ncolumns++)
 577                                 columns[ncolumns] = ncolumns;
 578                         break;
 579                 case 'J':
 580                         json = true;
 581                         break;
 582                 case 'r':
 583                         raw = true;
 584                         break;
 585                 case 't':
 586                         clock = parse_clock(optarg);
 587                         break;
 588                 case 'd':
 589                         path_clock = xmalloc(sizeof(*path_clock));
 590                         path_clock->path = optarg;
 591                         list_add(&path_clock->head, &dynamic_clocks);
 592                         break;
 593                 case OPT_NO_DISC_DYN:
 594                         disc_dynamic = false;
 595                         break;
 596                 case 'c':
 597                         cpu_clock = xmalloc(sizeof(*cpu_clock));
 598                         cpu_clock->pid = strtopid_or_err(optarg, _("failed to parse pid"));
 599                         snprintf(cpu_clock->name, sizeof(cpu_clock->name),
 600                                  "%jd", (intmax_t) cpu_clock->pid);
 601                         list_add(&cpu_clock->head, &cpu_clocks);
 602                         break;
 603                 case 'x':
 604                         path_clock = xmalloc(sizeof(*path_clock));
 605                         path_clock->path = optarg;
 606                         list_add(&path_clock->head, &rtc_clocks);
 607                         break;
 608                 case OPT_NO_DISC_RTC:
 609                         disc_rtc = false;
 610                         break;
 611                 case 'V':
 612                         print_version(EXIT_SUCCESS);
 613                 case 'h':
 614                         usage();
 615                 default:
 616                         errtryhelp(EXIT_FAILURE);
 617                 }
 618         }
 619
 620         if (argv[optind])
 621                 errtryhelp(EXIT_FAILURE);
 622
 623         if (clock != -1) {
 624                 rc = clock_gettime(clock, &now);
 625                 if (rc)
 626                         err(EXIT_FAILURE, _("failed to get time"));
 627                 printf("%ju.%09"PRId32"\n", (uintmax_t) now.tv_sec, (uint32_t) now.tv_nsec);
 628                 return EXIT_SUCCESS;
 629         }
 630
 631         if (!ncolumns) {
 632                 columns[ncolumns++] = COL_ID;
 633                 columns[ncolumns++] = COL_NAME;
 634                 columns[ncolumns++] = COL_TYPE;
 635                 columns[ncolumns++] = COL_TIME;
 636                 columns[ncolumns++] = COL_RESOL;
 637                 columns[ncolumns++] = COL_ISO_TIME;
 638         }
 639
 640         if (outarg && string_add_to_idarray(outarg, columns, ARRAY_SIZE(columns),
 641                                             &ncolumns, column_name_to_id) < 0)
 642                 return EXIT_FAILURE;
 643
 644         scols_init_debug(0);
 645
 646         tb = scols_new_table();
 647         if (!tb)
 648                 errx(EXIT_FAILURE, _("failed to allocate output table"));
 649         scols_table_set_name(tb, "clocks");
 650
 651         for (i = 0; i < ncolumns; i++) {
 652                 colinfo = &infos[columns[i]];
 653
 654                 col = scols_table_new_column(tb, colinfo->name, colinfo->whint, colinfo->flags);
 655                 if (!col)
 656                         errx(EXIT_FAILURE, _("failed to allocate output column"));
 657
 658                 scols_column_set_json_type(col, colinfo->json_type);
 659         }
 660
 661         for (i = 0; i < ARRAY_SIZE(clocks); i++)
 662                 add_posix_clock_line(tb, columns, ncolumns, &clocks[i]);
 663
 664         if (disc_dynamic)
 665                 add_dynamic_clocks_from_discovery(tb, columns, ncolumns);
 666
 667         list_for_each(current_path_clock, &dynamic_clocks) {
 668                 path_clock = list_entry(current_path_clock, struct path_clock, head);
 669                 add_dynamic_clock_from_path(tb, columns, ncolumns, path_clock->path, true);
 670         }
 671
 672         list_free(&dynamic_clocks, struct path_clock, head, free);
 673
 674         if (disc_rtc)
 675                 add_rtc_clocks_from_discovery(tb, columns, ncolumns);
 676
 677         list_for_each(current_path_clock, &rtc_clocks) {
 678                 path_clock = list_entry(current_path_clock, struct path_clock, head);
 679                 add_rtc_clock_from_path(tb, columns, ncolumns, path_clock->path, true);
 680         }
 681
 682         list_free(&rtc_clocks, struct path_clock, head, free);
 683
 684         list_for_each(current_cpu_clock, &cpu_clocks) {
 685                 cpu_clock = list_entry(current_cpu_clock, struct cpu_clock, head);
 686                 add_cpu_clock(tb, columns, ncolumns, cpu_clock->pid, cpu_clock->name);
 687         }
 688
 689         list_free(&cpu_clocks, struct cpu_clock, head, free);
 690
 691         scols_table_enable_json(tb, json);
 692         scols_table_enable_raw(tb, raw);
 693         scols_table_enable_noheadings(tb, noheadings);
 694         scols_print_table(tb);
 695         scols_unref_table(tb);
 696 }