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