granicus.if.org Git - sysstat/blob - tapestat.c

   1 /*
   2  * tapestat: report tape statistics
   3  * (C) 2015 Hewlett-Packard Development Company, L.P.
   4  *
   5  * Initial revision by Shane M. SEYMOUR (shane.seymour <at> hpe.com)
   6  * Modified for sysstat by Sebastien GODARD (sysstat <at> orange.fr)
   7  *
   8  ***************************************************************************
   9  * This program is free software; you can redistribute it and/or modify it *
  10  * under the terms of the GNU General Public License as published  by  the *
  11  * Free Software Foundation; either version 2 of the License, or (at  your *
  12  * option) any later version.                                              *
  13  *                                                                         *
  14  * This program is distributed in the hope that it  will  be  useful,  but *
  15  * WITHOUT ANY WARRANTY; without the implied warranty  of  MERCHANTABILITY *
  16  * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License *
  17  * for more details.                                                       *
  18  *                                                                         *
  19  * You should have received a copy of the GNU General Public License along *
  20  * with this program; if not, write to the Free Software Foundation, Inc., *
  21  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335 USA              *
  22  ***************************************************************************
  23  */
  24
  25 #include <stdio.h>
  26 #include <string.h>
  27 #include <stdlib.h>
  28 #include <unistd.h>
  29 #include <time.h>
  30 #include <dirent.h>
  31 #define __DO_NOT_DEFINE_COMPILE
  32 #include <regex.h>
  33 #include <inttypes.h>
  34 #include <stdint.h>
  35 #include <signal.h>
  36 #include <sys/stat.h>
  37 #include <sys/time.h>
  38 #include <sys/utsname.h>
  39
  40 #ifdef HAVE_SYS_PARAM_H
  41 #include <sys/param.h>
  42 #undef HZ /* sys/param.h defines HZ but needed for MAXPATHLEN */
  43 #endif
  44 #ifndef MAXPATHLEN
  45 #define MAXPATHLEN 256
  46 #endif
  47
  48 #include "version.h"
  49 #include "tapestat.h"
  50 #include "rd_stats.h"
  51 #include "count.h"
  52
  53 #ifdef USE_NLS
  54 #include <locale.h>
  55 #include <libintl.h>
  56 #define _(string) gettext(string)
  57 #else
  58 #define _(string) (string)
  59 #endif
  60
  61 #ifdef USE_SCCSID
  62 #define SCCSID "@(#)sysstat-" VERSION ": " __FILE__ " compiled " __DATE__ " " __TIME__
  63 char *sccsid(void) { return (SCCSID); }
  64 #endif
  65
  66 #ifdef TEST
  67 void int_handler(int n) { return; }
  68 #endif
  69
  70 int cpu_nr = 0;         /* Nb of processors on the machine */
  71 int flags = 0;          /* Flag for common options and system state */
  72
  73 long interval = 0;
  74 char timestamp[TIMESTAMP_LEN];
  75
  76 struct sigaction alrm_act;
  77
  78 /* Number of decimal places */
  79 int dplaces_nr = -1;
  80
  81 /*
  82  * For tape stats - it would be extremely rare for there to be a very large
  83  * number of tape drives attached to a system. I wouldn't expect to see more
  84  * than 20-30 in a very large configuration and discontinguous ones should
  85  * be even more rare. Because of this we keep the old and new data in a
  86  * simple data structure with the tape index being the number after the tape
  87  * drive, st0 at index 0, etc.
  88  */
  89 int max_tape_drives = 0;
  90 struct tape_stats *tape_new_stats = { NULL };
  91 struct tape_stats *tape_old_stats = { NULL };
  92 regex_t tape_reg;
  93
  94 /*
  95  ***************************************************************************
  96  * Print usage and exit.
  97  *
  98  * IN:
  99  * @progname    Name of sysstat command.
 100  ***************************************************************************
 101  */
 102 void usage(char *progname)
 103 {
 104         fprintf(stderr, _("Usage: %s [ options ] [ <interval> [ <count> ] ]\n"),
 105                 progname);
 106         fprintf(stderr, _("Options are:\n"
 107                           "[ --human ] [ -k | -m ] [ -t ] [ -V ] [ -y ] [ -z ]\n"));
 108         exit(1);
 109 }
 110
 111 /*
 112  ***************************************************************************
 113  * SIGALRM signal handler. No need to reset the handler here.
 114  *
 115  * IN:
 116  * @sig Signal number.
 117  ***************************************************************************
 118  */
 119 void alarm_handler(int sig)
 120 {
 121         alarm(interval);
 122 }
 123
 124 /*
 125  ***************************************************************************
 126  * Initialization.
 127  ***************************************************************************
 128  */
 129 void tape_initialise(void)
 130 {
 131         /* How many processors on this machine? */
 132         cpu_nr = get_cpu_nr(~0, FALSE);
 133
 134         /* Compile regular expression for tape names */
 135         if (regcomp(&tape_reg, "^st[0-9]+$", REG_EXTENDED) != 0) {
 136                 exit(1);
 137         }
 138 }
 139
 140 /*
 141  ***************************************************************************
 142  * Free structures.
 143  ***************************************************************************
 144  */
 145 void tape_uninitialise(void)
 146 {
 147         regfree(&tape_reg);
 148         if (tape_old_stats != NULL) {
 149                 free(tape_old_stats);
 150         }
 151         if (tape_new_stats != NULL) {
 152                 free(tape_new_stats);
 153         }
 154 }
 155
 156 /*
 157  ***************************************************************************
 158  * Get maximum number of tapes in the system.
 159  *
 160  * RETURNS:
 161  * Number of tapes found.
 162  ***************************************************************************
 163  */
 164 int get_max_tape_drives(void)
 165 {
 166         DIR *dir;
 167         struct dirent *entry;
 168         int new_max_tape_drives, tmp, num_stats_dir = 0;
 169         regmatch_t match;
 170         char stats_dir[MAXPATHLEN + 1];
 171         struct stat stat_buf;
 172
 173         new_max_tape_drives = max_tape_drives;
 174
 175         /* Open sysfs tree */
 176         dir = opendir(SYSFS_CLASS_TAPE_DIR);
 177         if (dir == NULL)
 178                 return 0;
 179
 180         while ((entry = readdir(dir)) != NULL) {
 181                 if (regexec(&tape_reg, &entry->d_name[0], 1, &match, 0) == 0) {
 182                         /* d_name[2] to skip the st at the front */
 183                         tmp = atoi(&entry->d_name[2]) + 1;
 184                         if (tmp > new_max_tape_drives) {
 185                                 new_max_tape_drives = tmp;
 186                         }
 187                 }
 188                 snprintf(stats_dir, MAXPATHLEN, "%s/%s/%s",
 189                         SYSFS_CLASS_TAPE_DIR, &entry->d_name[0], "stats");
 190                 if (stat(stats_dir, &stat_buf) == 0) {
 191                         if (S_ISDIR(stat_buf.st_mode)) {
 192                                 num_stats_dir++;
 193                         }
 194                 }
 195         }
 196         closedir(dir);
 197
 198         /* If there are no stats directories make the new number of tape drives 0 */
 199         if (num_stats_dir == 0) {
 200                 new_max_tape_drives = 0;
 201         }
 202
 203         return new_max_tape_drives;
 204 }
 205
 206 /*
 207  ***************************************************************************
 208  * Check if new tapes have been added and reallocate structures accordingly.
 209  ***************************************************************************
 210  */
 211 void tape_check_tapes_and_realloc(void)
 212 {
 213         int new_max_tape_drives, i;
 214
 215         /* Count again number of tapes */
 216         new_max_tape_drives = get_max_tape_drives();
 217
 218         if (new_max_tape_drives > max_tape_drives && new_max_tape_drives > 0) {
 219                 /* New tapes found: Realloc structures */
 220                 struct tape_stats *tape_old_stats_t = (struct tape_stats *)
 221                         realloc(tape_old_stats, sizeof(struct tape_stats) * new_max_tape_drives);
 222                 struct tape_stats *tape_new_stats_t = (struct tape_stats *)
 223                         realloc(tape_new_stats, sizeof(struct tape_stats) * new_max_tape_drives);
 224                 if ((tape_old_stats_t == NULL) || (tape_new_stats_t == NULL)) {
 225                         if (tape_old_stats_t != NULL) {
 226                                 free(tape_old_stats_t);
 227                                 tape_old_stats_t = NULL;
 228                         } else {
 229                                 free(tape_old_stats);
 230                                 tape_old_stats = NULL;
 231                         }
 232                         if (tape_new_stats_t != NULL) {
 233                                 free(tape_new_stats_t);
 234                                 tape_new_stats_t = NULL;
 235                         } else {
 236                                 free(tape_new_stats);
 237                                 tape_new_stats = NULL;
 238                         }
 239
 240                         perror("realloc");
 241                         exit(4);
 242                 }
 243
 244                 tape_old_stats = tape_old_stats_t;
 245                 tape_new_stats = tape_new_stats_t;
 246
 247                 for (i = max_tape_drives; i < new_max_tape_drives; i++) {
 248                         tape_old_stats[i].valid = TAPE_STATS_INVALID;
 249                         tape_new_stats[i].valid = TAPE_STATS_INVALID;
 250                 }
 251                 max_tape_drives = new_max_tape_drives;
 252         }
 253 }
 254
 255 /*
 256  ***************************************************************************
 257  * Collect initial statistics for all existing tapes in the system.
 258  * This function should be called only once.
 259  ***************************************************************************
 260  */
 261 void tape_gather_initial_stats(void)
 262 {
 263         int new_max_tape_drives, i;
 264         FILE *fp;
 265         char filename[MAXPATHLEN + 1];
 266
 267         /* Get number of tapes in the system */
 268         new_max_tape_drives = get_max_tape_drives();
 269
 270         if (new_max_tape_drives == 0) {
 271                 /* No tapes found */
 272                 fprintf(stderr, _("No tape drives with statistics found\n"));
 273                 exit(1);
 274         }
 275         else {
 276                 /* Allocate structures */
 277                 if (tape_old_stats == NULL) {
 278                         tape_old_stats = (struct tape_stats *)
 279                                 malloc(sizeof(struct tape_stats) * new_max_tape_drives);
 280                         tape_new_stats = (struct tape_stats *)
 281                                 malloc(sizeof(struct tape_stats) * new_max_tape_drives);
 282                         for (i = 0; i < new_max_tape_drives; i++) {
 283                                 tape_old_stats[i].valid = TAPE_STATS_INVALID;
 284                                 tape_new_stats[i].valid = TAPE_STATS_INVALID;
 285                         }
 286                         max_tape_drives = new_max_tape_drives;
 287                 } else
 288                         /* This should only be called once */
 289                         return;
 290         }
 291
 292         /* Read stats for each tape */
 293         for (i = 0; i < max_tape_drives; i++) {
 294                 /*
 295                  * Everything starts out valid but failing to open
 296                  * a file gets the tape drive marked invalid.
 297                  */
 298                 tape_new_stats[i].valid = TAPE_STATS_VALID;
 299                 tape_old_stats[i].valid = TAPE_STATS_VALID;
 300
 301                 __gettimeofday(&tape_old_stats[i].tv, NULL);
 302
 303                 tape_new_stats[i].tv.tv_sec = tape_old_stats[i].tv.tv_sec;
 304                 tape_new_stats[i].tv.tv_usec = tape_old_stats[i].tv.tv_usec;
 305
 306                 TAPE_STAT_FILE_VAL(TAPE_STAT_PATH "read_ns", read_time)
 307                 TAPE_STAT_FILE_VAL(TAPE_STAT_PATH "write_ns", write_time)
 308                 TAPE_STAT_FILE_VAL(TAPE_STAT_PATH "io_ns", other_time)
 309                 TAPE_STAT_FILE_VAL(TAPE_STAT_PATH "read_byte_cnt", read_bytes)
 310                 TAPE_STAT_FILE_VAL(TAPE_STAT_PATH "write_byte_cnt", write_bytes)
 311                 TAPE_STAT_FILE_VAL(TAPE_STAT_PATH "read_cnt", read_count)
 312                 TAPE_STAT_FILE_VAL(TAPE_STAT_PATH "write_cnt", write_count)
 313                 TAPE_STAT_FILE_VAL(TAPE_STAT_PATH "other_cnt", other_count)
 314                 TAPE_STAT_FILE_VAL(TAPE_STAT_PATH "resid_cnt", resid_count)
 315
 316                 tape_old_stats[i].read_time = 0;
 317                 tape_old_stats[i].write_time = 0;
 318                 tape_old_stats[i].other_time = 0;
 319                 tape_old_stats[i].read_bytes = 0;
 320                 tape_old_stats[i].write_bytes = 0;
 321                 tape_old_stats[i].read_count = 0;
 322                 tape_old_stats[i].write_count = 0;
 323                 tape_old_stats[i].other_count = 0;
 324                 tape_old_stats[i].resid_count = 0;
 325         }
 326 }
 327
 328 /*
 329  ***************************************************************************
 330  * Collect a new sample of statistics for all existing tapes in the system.
 331  ***************************************************************************
 332  */
 333 void tape_get_updated_stats(void)
 334 {
 335         int i;
 336         FILE *fp;
 337         char filename[MAXPATHLEN + 1] = { 0 };
 338
 339         /* Check tapes and realloc structures if  needed */
 340         tape_check_tapes_and_realloc();
 341
 342         for (i = 0; i < max_tape_drives; i++) {
 343                 /*
 344                  * Everything starts out valid but failing
 345                  * to open a file gets the tape drive marked invalid.
 346                  */
 347                 tape_new_stats[i].valid = TAPE_STATS_VALID;
 348                 __gettimeofday(&tape_new_stats[i].tv, NULL);
 349
 350                 TAPE_STAT_FILE_VAL(TAPE_STAT_PATH "read_ns", read_time)
 351                 TAPE_STAT_FILE_VAL(TAPE_STAT_PATH "write_ns", write_time)
 352                 TAPE_STAT_FILE_VAL(TAPE_STAT_PATH "io_ns", other_time)
 353                 TAPE_STAT_FILE_VAL(TAPE_STAT_PATH "read_byte_cnt", read_bytes)
 354                 TAPE_STAT_FILE_VAL(TAPE_STAT_PATH "write_byte_cnt", write_bytes)
 355                 TAPE_STAT_FILE_VAL(TAPE_STAT_PATH "read_cnt", read_count)
 356                 TAPE_STAT_FILE_VAL(TAPE_STAT_PATH "write_cnt", write_count)
 357                 TAPE_STAT_FILE_VAL(TAPE_STAT_PATH "other_cnt", other_count)
 358                 TAPE_STAT_FILE_VAL(TAPE_STAT_PATH "resid_cnt", resid_count)
 359
 360                 if ((tape_new_stats[i].read_time < tape_old_stats[i].read_time) ||
 361                     (tape_new_stats[i].write_time < tape_old_stats[i].write_time) ||
 362                     (tape_new_stats[i].other_time < tape_old_stats[i].other_time)) {
 363                         tape_new_stats[i].valid = TAPE_STATS_INVALID;
 364                 }
 365         }
 366 }
 367
 368 /*
 369  ***************************************************************************
 370  * Display tapes statistics headings.
 371  ***************************************************************************
 372  */
 373 void tape_write_headings(void)
 374 {
 375         printf("Tape:     r/s     w/s   ");
 376         if (DISPLAY_MEGABYTES(flags)) {
 377                 printf("MB_read/s   MB_wrtn/s");
 378         } else {
 379                 printf("kB_read/s   kB_wrtn/s");
 380         }
 381         printf("  %%Rd  %%Wr  %%Oa    Rs/s    Ot/s\n");
 382 }
 383
 384 /*
 385  ***************************************************************************
 386  * Calculate statistics for current tape.
 387  *
 388  * IN:
 389  * @i           Index in array for current tape.
 390  *
 391  * OUT:
 392  * @stats       Statistics for current tape.
 393  ***************************************************************************
 394  */
 395 void tape_calc_one_stats(struct calc_stats *stats, int i)
 396 {
 397         uint64_t duration;
 398         double temp;
 399         FILE *fp;
 400
 401         /* Duration in ms done in ms to prevent rounding issues with using seconds */
 402         duration = (tape_new_stats[i].tv.tv_sec -
 403                 tape_old_stats[i].tv.tv_sec) * 1000;
 404         duration -= tape_old_stats[i].tv.tv_usec / 1000;
 405         duration += tape_new_stats[i].tv.tv_usec / 1000;
 406
 407         /* If duration is zero we need to calculate the ms since boot time */
 408         if (duration == 0) {
 409                 fp = fopen(UPTIME, "r");
 410
 411                 /*
 412                  * Get uptime from /proc/uptime and if we can't then just set duration to
 413                  * be 0 - it will mean that we don't calculate stats.
 414                  */
 415                 if (fp == NULL) {
 416                         duration = 0;
 417                 } else {
 418                         if (fscanf(fp, "%lf", &temp) != 1) {
 419                                 temp = 0;
 420                         }
 421                         duration = (uint64_t) (temp * 1000);
 422                         fclose(fp);
 423                 }
 424         }
 425
 426         /* The second value passed into the macro is the thing being calculated */
 427         CALC_STAT_CNT(read_count, reads_per_second)
 428         CALC_STAT_CNT(write_count, writes_per_second)
 429         CALC_STAT_CNT(other_count, other_per_second)
 430         CALC_STAT_KB(read_bytes, kbytes_read_per_second)
 431         CALC_STAT_KB(write_bytes, kbytes_written_per_second)
 432         CALC_STAT_PCT(read_time, read_pct_wait)
 433         CALC_STAT_PCT(write_time, write_pct_wait)
 434         CALC_STAT_PCT(other_time, all_pct_wait)
 435         CALC_STAT_CNT(resid_count, resids_per_second)
 436 }
 437
 438 /*
 439  ***************************************************************************
 440  * Display statistics for current tape.
 441  *
 442  * IN:
 443  * @tape        Statistics for current tape.
 444  * @i           Index in array for current tape.
 445  ***************************************************************************
 446  */
 447 void tape_write_stats(struct calc_stats *tape, int i)
 448 {
 449         char buffer[32];
 450         uint64_t divisor = 1;
 451
 452         if (DISPLAY_MEGABYTES(flags))
 453                 divisor = 1024;
 454
 455         sprintf(buffer, "st%i        ", i);
 456         buffer[5] = 0;
 457         cprintf_in(IS_STR, "%s", buffer, 0);
 458         cprintf_u64(NO_UNIT, 2, 7,
 459                     tape->reads_per_second,
 460                     tape->writes_per_second);
 461         cprintf_u64(DISPLAY_UNIT(flags) ? UNIT_KILOBYTE : NO_UNIT, 2, 11,
 462                     DISPLAY_UNIT(flags) ? tape->kbytes_read_per_second
 463                                         : tape->kbytes_read_per_second / divisor,
 464                     DISPLAY_UNIT(flags) ? tape->kbytes_written_per_second
 465                                         : tape->kbytes_written_per_second / divisor);
 466         cprintf_pc(DISPLAY_UNIT(flags), 3, 4, 0,
 467                    (double) tape->read_pct_wait,
 468                    (double) tape->write_pct_wait,
 469                    (double) tape->all_pct_wait);
 470         cprintf_u64(NO_UNIT, 2, 7,
 471                     tape->resids_per_second,
 472                     tape->other_per_second);
 473         printf("\n");
 474 }
 475
 476 /*
 477  ***************************************************************************
 478  * Print everything now (stats and uptime).
 479  *
 480  * IN:
 481  * @rectime     Current date and time.
 482  ***************************************************************************
 483  */
 484 void write_stats(struct tm *rectime)
 485 {
 486         int i;
 487         struct calc_stats tape;
 488         struct tape_stats *tmp;
 489
 490         /* Test stdout */
 491         TEST_STDOUT(STDOUT_FILENO);
 492
 493         /* Print time stamp */
 494         if (DISPLAY_TIMESTAMP(flags)) {
 495                 if (DISPLAY_ISO(flags)) {
 496                         strftime(timestamp, sizeof(timestamp), "%FT%T%z", rectime);
 497                 }
 498                 else {
 499                         strftime(timestamp, sizeof(timestamp), "%x %X", rectime);
 500                 }
 501                 printf("%s\n", timestamp);
 502         }
 503
 504         /* Print the headings */
 505         tape_write_headings();
 506
 507         /*
 508          * If either new or old is invalid or the I/Os per second is 0 and
 509          * zero omit is true then we print nothing.
 510          */
 511         if (max_tape_drives > 0) {
 512
 513                 for (i = 0; i < max_tape_drives; i++) {
 514                         if ((tape_new_stats[i].valid == TAPE_STATS_VALID) &&
 515                                 (tape_old_stats[i].valid == TAPE_STATS_VALID)) {
 516                                 tape_calc_one_stats(&tape, i);
 517                                 if (!(DISPLAY_ZERO_OMIT(flags)
 518                                         && (tape.other_per_second == 0)
 519                                         && (tape.reads_per_second == 0)
 520                                         && (tape.writes_per_second == 0)
 521                                         && (tape.kbytes_read_per_second == 0)
 522                                         && (tape.kbytes_written_per_second == 0)
 523                                         && (tape.read_pct_wait == 0)
 524                                         && (tape.write_pct_wait == 0)
 525                                         && (tape.all_pct_wait == 0)
 526                                         && (tape.resids_per_second == 0))) {
 527                                         tape_write_stats(&tape, i);
 528                                 }
 529                         }
 530                 }
 531                 /*
 532                  * Swap new and old so next time we compare against the new old stats.
 533                  * If a new tape drive appears it won't appear in the output until after
 534                  * the second time we gather information about it.
 535                  */
 536                 tmp = tape_old_stats;
 537                 tape_old_stats = tape_new_stats;
 538                 tape_new_stats = tmp;
 539         }
 540         printf("\n");
 541 }
 542
 543 /*
 544  ***************************************************************************
 545  * Main loop: Read tape stats from the relevant sources and display them.
 546  *
 547  * IN:
 548  * @count       Number of lines of stats to print.
 549  * @rectime     Current date and time.
 550  ***************************************************************************
 551  */
 552 void rw_tape_stat_loop(long int count, struct tm *rectime)
 553 {
 554         struct tape_stats *tmp;
 555         int skip = 0;
 556
 557         /* Should we skip first report? */
 558         if (DISPLAY_OMIT_SINCE_BOOT(flags) && interval > 0) {
 559                 skip = 1;
 560         }
 561
 562         do {
 563
 564                 if (tape_new_stats == NULL) {
 565                         tape_gather_initial_stats();
 566                 } else {
 567                         tape_get_updated_stats();
 568                 }
 569
 570                 /* Get time */
 571                 get_localtime(rectime, 0);
 572
 573                 /* Check whether we should skip first report */
 574                 if (!skip) {
 575                         /* Print results */
 576                         write_stats(rectime);
 577
 578                         if (count > 0) {
 579                                 count--;
 580                         }
 581                 }
 582                 else {
 583                         skip = 0;
 584                         tmp = tape_old_stats;
 585                         tape_old_stats = tape_new_stats;
 586                         tape_new_stats = tmp;
 587                 }
 588
 589                 if (count) {
 590                         __pause();
 591                 }
 592         }
 593         while (count);
 594 }
 595
 596 /*
 597  ***************************************************************************
 598  * Main entry to the tapestat program.
 599  ***************************************************************************
 600  */
 601 int main(int argc, char **argv)
 602 {
 603         int it = 0;
 604         int opt = 1;
 605         int i;
 606         long count = 1;
 607         struct utsname header;
 608         struct tm rectime;
 609
 610 #ifdef USE_NLS
 611         /* Init National Language Support */
 612         init_nls();
 613 #endif
 614
 615         /* Init color strings */
 616         init_colors();
 617
 618         /* Process args... */
 619         while (opt < argc) {
 620
 621                 if (!strcmp(argv[opt], "--human")) {
 622                         flags |= T_D_UNIT;
 623                         opt++;
 624                 }
 625
 626                 else if (!strncmp(argv[opt], "-", 1)) {
 627                         for (i = 1; *(argv[opt] + i); i++) {
 628
 629                                 switch (*(argv[opt] + i)) {
 630
 631                                 case 'k':
 632                                         if (DISPLAY_MEGABYTES(flags)) {
 633                                                 usage(argv[0]);
 634                                         }
 635                                         /* Display stats in kB/s */
 636                                         flags |= T_D_KILOBYTES;
 637                                         break;
 638
 639                                 case 'm':
 640                                         if (DISPLAY_KILOBYTES(flags)) {
 641                                                 usage(argv[0]);
 642                                         }
 643                                         /* Display stats in MB/s */
 644                                         flags |= T_D_MEGABYTES;
 645                                         break;
 646
 647                                 case 't':
 648                                         /* Display timestamp */
 649                                         flags |= T_D_TIMESTAMP;
 650                                         break;
 651
 652                                 case 'y':
 653                                         /* Don't display stats since system restart */
 654                                         flags |= T_D_OMIT_SINCE_BOOT;
 655                                         break;
 656
 657                                 case 'z':
 658                                         /* Omit output for devices with no activity */
 659                                         flags |= T_D_ZERO_OMIT;
 660                                         break;
 661
 662                                 case 'V':
 663                                         /* Print version number and exit */
 664                                         print_version();
 665                                         break;
 666
 667                                 default:
 668                                         usage(argv[0]);
 669                                 }
 670                         }
 671                         opt++;
 672                 }
 673
 674                 else if (!it) {
 675                         interval = atol(argv[opt++]);
 676                         if (interval < 0) {
 677                                 usage(argv[0]);
 678                         }
 679                         count = -1;
 680                         it = 1;
 681                 }
 682
 683                 else if (it > 0) {
 684                         count = atol(argv[opt++]);
 685                         if ((count < 1) || !interval) {
 686                                 usage(argv[0]);
 687                         }
 688                         it = -1;
 689                 }
 690                 else {
 691                         usage(argv[0]);
 692                 }
 693         }
 694
 695         if (!interval) {
 696                 count = 1;
 697         }
 698
 699         tape_initialise();
 700
 701         get_localtime(&rectime, 0);
 702
 703         /*
 704          * Don't buffer data if redirected to a pipe.
 705          * Note: With musl-c, the behavior of this function is undefined except
 706          * when it is the first operation on the stream.
 707          */
 708         setbuf(stdout, NULL);
 709
 710         /* Get system name, release number and hostname */
 711         __uname(&header);
 712         if (print_gal_header(&rectime, header.sysname, header.release,
 713                              header.nodename, header.machine, cpu_nr,
 714                              PLAIN_OUTPUT)) {
 715                 flags |= T_D_ISO;
 716         }
 717         printf("\n");
 718
 719         /* Set a handler for SIGALRM */
 720         memset(&alrm_act, 0, sizeof(alrm_act));
 721         alrm_act.sa_handler = alarm_handler;
 722         sigaction(SIGALRM, &alrm_act, NULL);
 723         alarm(interval);
 724
 725         /* Main loop */
 726         rw_tape_stat_loop(count, &rectime);
 727
 728         /* Free structures */
 729         tape_uninitialise();
 730
 731         return 0;
 732 }