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
 182                 if (regexec(&tape_reg, &entry->d_name[0], 1, &match, 0) == 0) {
 183                         /* d_name[2] to skip the st at the front */
 184                         tmp = atoi(&entry->d_name[2]) + 1;
 185                         if (tmp > new_max_tape_drives) {
 186                                 new_max_tape_drives = tmp;
 187                         }
 188                 }
 189                 snprintf(stats_dir, MAXPATHLEN, "%s/%s/%s",
 190                         SYSFS_CLASS_TAPE_DIR, &entry->d_name[0], "stats");
 191                 if (stat(stats_dir, &stat_buf) == 0) {
 192                         if (S_ISDIR(stat_buf.st_mode)) {
 193                                 num_stats_dir++;
 194                         }
 195                 }
 196         }
 197         closedir(dir);
 198
 199         /* If there are no stats directories make the new number of tape drives 0 */
 200         if (num_stats_dir == 0) {
 201                 new_max_tape_drives = 0;
 202         }
 203
 204         return new_max_tape_drives;
 205 }
 206
 207 /*
 208  ***************************************************************************
 209  * Check if new tapes have been added and reallocate structures accordingly.
 210  ***************************************************************************
 211  */
 212 void tape_check_tapes_and_realloc(void)
 213 {
 214         int new_max_tape_drives, i;
 215
 216         /* Count again number of tapes */
 217         new_max_tape_drives = get_max_tape_drives();
 218
 219         if (new_max_tape_drives > max_tape_drives && new_max_tape_drives > 0) {
 220                 /* New tapes found: Realloc structures */
 221                 struct tape_stats *tape_old_stats_t = (struct tape_stats *)
 222                         realloc(tape_old_stats, sizeof(struct tape_stats) * new_max_tape_drives);
 223                 struct tape_stats *tape_new_stats_t = (struct tape_stats *)
 224                         realloc(tape_new_stats, sizeof(struct tape_stats) * new_max_tape_drives);
 225                 if ((tape_old_stats_t == NULL) || (tape_new_stats_t == NULL)) {
 226                         if (tape_old_stats_t != NULL) {
 227                                 free(tape_old_stats_t);
 228                                 tape_old_stats_t = NULL;
 229                         } else {
 230                                 free(tape_old_stats);
 231                                 tape_old_stats = NULL;
 232                         }
 233                         if (tape_new_stats_t != NULL) {
 234                                 free(tape_new_stats_t);
 235                                 tape_new_stats_t = NULL;
 236                         } else {
 237                                 free(tape_new_stats);
 238                                 tape_new_stats = NULL;
 239                         }
 240
 241                         perror("realloc");
 242                         exit(4);
 243                 }
 244
 245                 tape_old_stats = tape_old_stats_t;
 246                 tape_new_stats = tape_new_stats_t;
 247
 248                 for (i = max_tape_drives; i < new_max_tape_drives; i++) {
 249                         tape_old_stats[i].valid = TAPE_STATS_INVALID;
 250                         tape_new_stats[i].valid = TAPE_STATS_INVALID;
 251                 }
 252                 max_tape_drives = new_max_tape_drives;
 253         }
 254 }
 255
 256 /*
 257  ***************************************************************************
 258  * Collect initial statistics for all existing tapes in the system.
 259  * This function should be called only once.
 260  ***************************************************************************
 261  */
 262 void tape_gather_initial_stats(void)
 263 {
 264         int new_max_tape_drives, i;
 265         FILE *fp;
 266         char filename[MAXPATHLEN + 1];
 267
 268         /* Get number of tapes in the system */
 269         new_max_tape_drives = get_max_tape_drives();
 270
 271         if (new_max_tape_drives == 0) {
 272                 /* No tapes found */
 273                 fprintf(stderr, _("No tape drives with statistics found\n"));
 274                 exit(1);
 275         }
 276         else {
 277                 /* Allocate structures */
 278                 if (tape_old_stats == NULL) {
 279                         tape_old_stats = (struct tape_stats *)
 280                                 malloc(sizeof(struct tape_stats) * new_max_tape_drives);
 281                         tape_new_stats = (struct tape_stats *)
 282                                 malloc(sizeof(struct tape_stats) * new_max_tape_drives);
 283                         for (i = 0; i < new_max_tape_drives; i++) {
 284                                 tape_old_stats[i].valid = TAPE_STATS_INVALID;
 285                                 tape_new_stats[i].valid = TAPE_STATS_INVALID;
 286                         }
 287                         max_tape_drives = new_max_tape_drives;
 288                 } else
 289                         /* This should only be called once */
 290                         return;
 291         }
 292
 293         /* Read stats for each tape */
 294         for (i = 0; i < max_tape_drives; i++) {
 295                 /*
 296                  * Everything starts out valid but failing to open
 297                  * a file gets the tape drive marked invalid.
 298                  */
 299                 tape_new_stats[i].valid = TAPE_STATS_VALID;
 300                 tape_old_stats[i].valid = TAPE_STATS_VALID;
 301
 302                 __gettimeofday(&tape_old_stats[i].tv, NULL);
 303
 304                 tape_new_stats[i].tv.tv_sec = tape_old_stats[i].tv.tv_sec;
 305                 tape_new_stats[i].tv.tv_usec = tape_old_stats[i].tv.tv_usec;
 306
 307                 TAPE_STAT_FILE_VAL(TAPE_STAT_PATH "read_ns", read_time)
 308                 TAPE_STAT_FILE_VAL(TAPE_STAT_PATH "write_ns", write_time)
 309                 TAPE_STAT_FILE_VAL(TAPE_STAT_PATH "io_ns", other_time)
 310                 TAPE_STAT_FILE_VAL(TAPE_STAT_PATH "read_byte_cnt", read_bytes)
 311                 TAPE_STAT_FILE_VAL(TAPE_STAT_PATH "write_byte_cnt", write_bytes)
 312                 TAPE_STAT_FILE_VAL(TAPE_STAT_PATH "read_cnt", read_count)
 313                 TAPE_STAT_FILE_VAL(TAPE_STAT_PATH "write_cnt", write_count)
 314                 TAPE_STAT_FILE_VAL(TAPE_STAT_PATH "other_cnt", other_count)
 315                 TAPE_STAT_FILE_VAL(TAPE_STAT_PATH "resid_cnt", resid_count)
 316
 317                 tape_old_stats[i].read_time = 0;
 318                 tape_old_stats[i].write_time = 0;
 319                 tape_old_stats[i].other_time = 0;
 320                 tape_old_stats[i].read_bytes = 0;
 321                 tape_old_stats[i].write_bytes = 0;
 322                 tape_old_stats[i].read_count = 0;
 323                 tape_old_stats[i].write_count = 0;
 324                 tape_old_stats[i].other_count = 0;
 325                 tape_old_stats[i].resid_count = 0;
 326         }
 327 }
 328
 329 /*
 330  ***************************************************************************
 331  * Collect a new sample of statistics for all existing tapes in the system.
 332  ***************************************************************************
 333  */
 334 void tape_get_updated_stats(void)
 335 {
 336         int i;
 337         FILE *fp;
 338         char filename[MAXPATHLEN + 1] = { 0 };
 339
 340         /* Check tapes and realloc structures if  needed */
 341         tape_check_tapes_and_realloc();
 342
 343         for (i = 0; i < max_tape_drives; i++) {
 344                 /*
 345                  * Everything starts out valid but failing
 346                  * to open a file gets the tape drive marked invalid.
 347                  */
 348                 tape_new_stats[i].valid = TAPE_STATS_VALID;
 349                 __gettimeofday(&tape_new_stats[i].tv, NULL);
 350
 351                 TAPE_STAT_FILE_VAL(TAPE_STAT_PATH "read_ns", read_time)
 352                 TAPE_STAT_FILE_VAL(TAPE_STAT_PATH "write_ns", write_time)
 353                 TAPE_STAT_FILE_VAL(TAPE_STAT_PATH "io_ns", other_time)
 354                 TAPE_STAT_FILE_VAL(TAPE_STAT_PATH "read_byte_cnt", read_bytes)
 355                 TAPE_STAT_FILE_VAL(TAPE_STAT_PATH "write_byte_cnt", write_bytes)
 356                 TAPE_STAT_FILE_VAL(TAPE_STAT_PATH "read_cnt", read_count)
 357                 TAPE_STAT_FILE_VAL(TAPE_STAT_PATH "write_cnt", write_count)
 358                 TAPE_STAT_FILE_VAL(TAPE_STAT_PATH "other_cnt", other_count)
 359                 TAPE_STAT_FILE_VAL(TAPE_STAT_PATH "resid_cnt", resid_count)
 360
 361                 if ((tape_new_stats[i].read_time < tape_old_stats[i].read_time) ||
 362                     (tape_new_stats[i].write_time < tape_old_stats[i].write_time) ||
 363                     (tape_new_stats[i].other_time < tape_old_stats[i].other_time)) {
 364                         tape_new_stats[i].valid = TAPE_STATS_INVALID;
 365                 }
 366         }
 367 }
 368
 369 /*
 370  ***************************************************************************
 371  * Display tapes statistics headings.
 372  ***************************************************************************
 373  */
 374 void tape_write_headings(void)
 375 {
 376         printf("Tape:     r/s     w/s   ");
 377         if (DISPLAY_MEGABYTES(flags)) {
 378                 printf("MB_read/s   MB_wrtn/s");
 379         } else {
 380                 printf("kB_read/s   kB_wrtn/s");
 381         }
 382         printf("  %%Rd  %%Wr  %%Oa    Rs/s    Ot/s\n");
 383 }
 384
 385 /*
 386  ***************************************************************************
 387  * Calculate statistics for current tape.
 388  *
 389  * IN:
 390  * @i           Index in array for current tape.
 391  *
 392  * OUT:
 393  * @stats       Statistics for current tape.
 394  ***************************************************************************
 395  */
 396 void tape_calc_one_stats(struct calc_stats *stats, int i)
 397 {
 398         uint64_t duration;
 399         double temp;
 400         FILE *fp;
 401
 402         /* Duration in ms done in ms to prevent rounding issues with using seconds */
 403         duration = (tape_new_stats[i].tv.tv_sec -
 404                 tape_old_stats[i].tv.tv_sec) * 1000;
 405         duration -= tape_old_stats[i].tv.tv_usec / 1000;
 406         duration += tape_new_stats[i].tv.tv_usec / 1000;
 407
 408         /* If duration is zero we need to calculate the ms since boot time */
 409         if (duration == 0) {
 410                 fp = fopen(UPTIME, "r");
 411
 412                 /*
 413                  * Get uptime from /proc/uptime and if we can't then just set duration to
 414                  * be 0 - it will mean that we don't calculate stats.
 415                  */
 416                 if (fp == NULL) {
 417                         duration = 0;
 418                 } else {
 419                         if (fscanf(fp, "%lf", &temp) != 1) {
 420                                 temp = 0;
 421                         }
 422                         duration = (uint64_t) (temp * 1000);
 423                         fclose(fp);
 424                 }
 425         }
 426
 427         /* The second value passed into the macro is the thing being calculated */
 428         CALC_STAT_CNT(read_count, reads_per_second)
 429         CALC_STAT_CNT(write_count, writes_per_second)
 430         CALC_STAT_CNT(other_count, other_per_second)
 431         CALC_STAT_KB(read_bytes, kbytes_read_per_second)
 432         CALC_STAT_KB(write_bytes, kbytes_written_per_second)
 433         CALC_STAT_PCT(read_time, read_pct_wait)
 434         CALC_STAT_PCT(write_time, write_pct_wait)
 435         CALC_STAT_PCT(other_time, all_pct_wait)
 436         CALC_STAT_CNT(resid_count, resids_per_second)
 437 }
 438
 439 /*
 440  ***************************************************************************
 441  * Display statistics for current tape.
 442  *
 443  * IN:
 444  * @tape        Statistics for current tape.
 445  * @i           Index in array for current tape.
 446  ***************************************************************************
 447  */
 448 void tape_write_stats(struct calc_stats *tape, int i)
 449 {
 450         char buffer[32];
 451         uint64_t divisor = 1;
 452
 453         if (DISPLAY_MEGABYTES(flags))
 454                 divisor = 1024;
 455
 456         sprintf(buffer, "st%i        ", i);
 457         buffer[5] = 0;
 458         cprintf_in(IS_STR, "%s", buffer, 0);
 459         cprintf_u64(NO_UNIT, 2, 7,
 460                     tape->reads_per_second,
 461                     tape->writes_per_second);
 462         cprintf_u64(DISPLAY_UNIT(flags) ? UNIT_KILOBYTE : NO_UNIT, 2, 11,
 463                     DISPLAY_UNIT(flags) ? tape->kbytes_read_per_second
 464                                         : tape->kbytes_read_per_second / divisor,
 465                     DISPLAY_UNIT(flags) ? tape->kbytes_written_per_second
 466                                         : tape->kbytes_written_per_second / divisor);
 467         cprintf_pc(DISPLAY_UNIT(flags), 3, 4, 0,
 468                    (double) tape->read_pct_wait,
 469                    (double) tape->write_pct_wait,
 470                    (double) tape->all_pct_wait);
 471         cprintf_u64(NO_UNIT, 2, 7,
 472                     tape->resids_per_second,
 473                     tape->other_per_second);
 474         printf("\n");
 475 }
 476
 477 /*
 478  ***************************************************************************
 479  * Print everything now (stats and uptime).
 480  *
 481  * IN:
 482  * @rectime     Current date and time.
 483  ***************************************************************************
 484  */
 485 void write_stats(struct tm *rectime)
 486 {
 487         int i;
 488         struct calc_stats tape;
 489         struct tape_stats *tmp;
 490
 491         /* Test stdout */
 492         TEST_STDOUT(STDOUT_FILENO);
 493
 494         /* Print time stamp */
 495         if (DISPLAY_TIMESTAMP(flags)) {
 496                 if (DISPLAY_ISO(flags)) {
 497                         strftime(timestamp, sizeof(timestamp), "%FT%T%z", rectime);
 498                 }
 499                 else {
 500                         strftime(timestamp, sizeof(timestamp), "%x %X", rectime);
 501                 }
 502                 printf("%s\n", timestamp);
 503         }
 504
 505         /* Print the headings */
 506         tape_write_headings();
 507
 508         /*
 509          * If either new or old is invalid or the I/Os per second is 0 and
 510          * zero omit is true then we print nothing.
 511          */
 512         if (max_tape_drives > 0) {
 513
 514                 for (i = 0; i < max_tape_drives; i++) {
 515                         if ((tape_new_stats[i].valid == TAPE_STATS_VALID) &&
 516                                 (tape_old_stats[i].valid == TAPE_STATS_VALID)) {
 517                                 tape_calc_one_stats(&tape, i);
 518                                 if (!(DISPLAY_ZERO_OMIT(flags)
 519                                         && (tape.other_per_second == 0)
 520                                         && (tape.reads_per_second == 0)
 521                                         && (tape.writes_per_second == 0)
 522                                         && (tape.kbytes_read_per_second == 0)
 523                                         && (tape.kbytes_written_per_second == 0)
 524                                         && (tape.read_pct_wait == 0)
 525                                         && (tape.write_pct_wait == 0)
 526                                         && (tape.all_pct_wait == 0)
 527                                         && (tape.resids_per_second == 0))) {
 528                                         tape_write_stats(&tape, i);
 529                                 }
 530                         }
 531                 }
 532                 /*
 533                  * Swap new and old so next time we compare against the new old stats.
 534                  * If a new tape drive appears it won't appear in the output until after
 535                  * the second time we gather information about it.
 536                  */
 537                 tmp = tape_old_stats;
 538                 tape_old_stats = tape_new_stats;
 539                 tape_new_stats = tmp;
 540         }
 541         printf("\n");
 542 }
 543
 544 /*
 545  ***************************************************************************
 546  * Main loop: Read tape stats from the relevant sources and display them.
 547  *
 548  * IN:
 549  * @count       Number of lines of stats to print.
 550  * @rectime     Current date and time.
 551  ***************************************************************************
 552  */
 553 void rw_tape_stat_loop(long int count, struct tm *rectime)
 554 {
 555         struct tape_stats *tmp;
 556         int skip = 0;
 557
 558         /* Should we skip first report? */
 559         if (DISPLAY_OMIT_SINCE_BOOT(flags) && interval > 0) {
 560                 skip = 1;
 561         }
 562
 563         do {
 564
 565                 if (tape_new_stats == NULL) {
 566                         tape_gather_initial_stats();
 567                 } else {
 568                         tape_get_updated_stats();
 569                 }
 570
 571                 /* Get time */
 572                 get_xtime(rectime, 0, LOCAL_TIME);
 573
 574                 /* Check whether we should skip first report */
 575                 if (!skip) {
 576                         /* Print results */
 577                         write_stats(rectime);
 578
 579                         if (count > 0) {
 580                                 count--;
 581                         }
 582                 }
 583                 else {
 584                         skip = 0;
 585                         tmp = tape_old_stats;
 586                         tape_old_stats = tape_new_stats;
 587                         tape_new_stats = tmp;
 588                 }
 589
 590                 if (count) {
 591                         __pause();
 592                 }
 593         }
 594         while (count);
 595 }
 596
 597 /*
 598  ***************************************************************************
 599  * Main entry to the tapestat program.
 600  ***************************************************************************
 601  */
 602 int main(int argc, char **argv)
 603 {
 604         int it = 0;
 605         int opt = 1;
 606         int i;
 607         long count = 1;
 608         struct utsname header;
 609         struct tm rectime;
 610
 611 #ifdef USE_NLS
 612         /* Init National Language Support */
 613         init_nls();
 614 #endif
 615
 616         /* Init color strings */
 617         init_colors();
 618
 619         /* Process args... */
 620         while (opt < argc) {
 621
 622                 if (!strcmp(argv[opt], "--human")) {
 623                         flags |= T_D_UNIT;
 624                         opt++;
 625                 }
 626
 627                 else if (!strncmp(argv[opt], "-", 1)) {
 628                         for (i = 1; *(argv[opt] + i); i++) {
 629
 630                                 switch (*(argv[opt] + i)) {
 631
 632                                 case 'k':
 633                                         if (DISPLAY_MEGABYTES(flags)) {
 634                                                 usage(argv[0]);
 635                                         }
 636                                         /* Display stats in kB/s */
 637                                         flags |= T_D_KILOBYTES;
 638                                         break;
 639
 640                                 case 'm':
 641                                         if (DISPLAY_KILOBYTES(flags)) {
 642                                                 usage(argv[0]);
 643                                         }
 644                                         /* Display stats in MB/s */
 645                                         flags |= T_D_MEGABYTES;
 646                                         break;
 647
 648                                 case 't':
 649                                         /* Display timestamp */
 650                                         flags |= T_D_TIMESTAMP;
 651                                         break;
 652
 653                                 case 'y':
 654                                         /* Don't display stats since system restart */
 655                                         flags |= T_D_OMIT_SINCE_BOOT;
 656                                         break;
 657
 658                                 case 'z':
 659                                         /* Omit output for devices with no activity */
 660                                         flags |= T_D_ZERO_OMIT;
 661                                         break;
 662
 663                                 case 'V':
 664                                         /* Print version number and exit */
 665                                         print_version();
 666                                         break;
 667
 668                                 default:
 669                                         usage(argv[0]);
 670                                 }
 671                         }
 672                         opt++;
 673                 }
 674
 675                 else if (!it) {
 676                         interval = atol(argv[opt++]);
 677                         if (interval < 0) {
 678                                 usage(argv[0]);
 679                         }
 680                         count = -1;
 681                         it = 1;
 682                 }
 683
 684                 else if (it > 0) {
 685                         count = atol(argv[opt++]);
 686                         if ((count < 1) || !interval) {
 687                                 usage(argv[0]);
 688                         }
 689                         it = -1;
 690                 }
 691                 else {
 692                         usage(argv[0]);
 693                 }
 694         }
 695
 696         if (!interval) {
 697                 count = 1;
 698         }
 699
 700         tape_initialise();
 701
 702         get_xtime(&rectime, 0, LOCAL_TIME);
 703
 704         /*
 705          * Don't buffer data if redirected to a pipe.
 706          * Note: With musl-c, the behavior of this function is undefined except
 707          * when it is the first operation on the stream.
 708          */
 709         setbuf(stdout, NULL);
 710
 711         /* Get system name, release number and hostname */
 712         __uname(&header);
 713         if (print_gal_header(&rectime, header.sysname, header.release,
 714                              header.nodename, header.machine, cpu_nr,
 715                              PLAIN_OUTPUT)) {
 716                 flags |= T_D_ISO;
 717         }
 718         printf("\n");
 719
 720         /* Set a handler for SIGALRM */
 721         memset(&alrm_act, 0, sizeof(alrm_act));
 722         alrm_act.sa_handler = alarm_handler;
 723         sigaction(SIGALRM, &alrm_act, NULL);
 724         alarm(interval);
 725
 726         /* Main loop */
 727         rw_tape_stat_loop(count, &rectime);
 728
 729         /* Free structures */
 730         tape_uninitialise();
 731
 732         return 0;
 733 }