dss.c

   1 #include <string.h>
   2 #include <stdlib.h>
   3 #include <stdarg.h>
   4 #include <assert.h>
   5 #include <errno.h>
   6 #include <sys/types.h>
   7 #include <signal.h>
   8 #include <ctype.h>
   9 #include <sys/stat.h>
  10 #include <unistd.h>
  11 #include <inttypes.h>
  12 #include <time.h>
  13 #include <sys/wait.h>
  14 #include <fnmatch.h>
  15 #include <limits.h>
  16
  17
  18 #include "gcc-compat.h"
  19 #include "cmdline.h"
  20 #include "log.h"
  21 #include "string.h"
  22 #include "error.h"
  23 #include "fd.h"
  24 #include "exec.h"
  25
  26
  27 struct gengetopt_args_info conf;
  28 char *dss_error_txt = NULL;
  29
  30 DEFINE_DSS_ERRLIST;
  31
  32
  33 /* a litte cpp magic helps to DRY */
  34 #define COMMANDS \
  35         COMMAND(ls) \
  36         COMMAND(create) \
  37         COMMAND(prune) \
  38         COMMAND(run)
  39 #define COMMAND(x) int com_ ##x(void);
  40 COMMANDS
  41 #undef COMMAND
  42 #define COMMAND(x) if (conf.x ##_given) return com_ ##x();
  43 int call_command_handler(void)
  44 {
  45         COMMANDS
  46         DSS_EMERG_LOG("BUG: did not find command handler\n");
  47         exit(EXIT_FAILURE);
  48 }
  49 #undef COMMAND
  50 #undef COMMANDS
  51
  52 /*
  53  * complete, not being deleted: 1204565370-1204565371.Sun_Mar_02_2008_14_33-Sun_Mar_02_2008_14_43
  54  * complete, being deleted: 1204565370-1204565371.being_deleted
  55  * incomplete, not being deleted: 1204565370-incomplete
  56  * incomplete, being deleted: 1204565370-incomplete.being_deleted
  57  */
  58 enum snapshot_status_flags {
  59         SS_COMPLETE = 1,
  60         SS_BEING_DELETED = 2,
  61 };
  62
  63 struct snapshot {
  64         char *name;
  65         int64_t creation_time;
  66         int64_t completion_time;
  67         enum snapshot_status_flags flags;
  68         unsigned interval;
  69 };
  70
  71 int is_snapshot(const char *dirname, int64_t now, struct snapshot *s)
  72 {
  73         int i, ret;
  74         char *dash, *dot, *tmp;
  75         int64_t num;
  76
  77         assert(dirname);
  78         dash = strchr(dirname, '-');
  79         if (!dash || !dash[1] || dash == dirname)
  80                 return 0;
  81         for (i = 0; dirname[i] != '-'; i++)
  82                 if (!isdigit(dirname[i]))
  83                         return 0;
  84         tmp = dss_strdup(dirname);
  85         tmp[i] = '\0';
  86         ret = dss_atoi64(tmp, &num);
  87         free(tmp);
  88         if (ret < 0) {
  89                 free(dss_error_txt);
  90                 return 0;
  91         }
  92         assert(num >= 0);
  93         if (num > now)
  94                 return 0;
  95         s->creation_time = num;
  96         //DSS_DEBUG_LOG("%s start time: %lli\n", dirname, (long long)s->creation_time);
  97         s->interval = (long long) ((now - s->creation_time)
  98                 / conf.unit_interval_arg / 24 / 3600);
  99         if (!strcmp(dash + 1, "incomplete")) {
 100                 s->completion_time = -1;
 101                 s->flags = 0; /* neither complete, nor being deleted */
 102                 goto success;
 103         }
 104         if (!strcmp(dash + 1, "incomplete.being_deleted")) {
 105                 s->completion_time = -1;
 106                 s->flags = SS_BEING_DELETED; /* mot cpmplete, being deleted */
 107                 goto success;
 108         }
 109         tmp = dash + 1;
 110         dot = strchr(tmp, '.');
 111         if (!dot || !dot[1] || dot == tmp)
 112                 return 0;
 113         for (i = 0; tmp[i] != '.'; i++)
 114                 if (!isdigit(tmp[i]))
 115                         return 0;
 116         tmp = dss_strdup(dash + 1);
 117         tmp[i] = '\0';
 118         ret = dss_atoi64(tmp, &num);
 119         free(tmp);
 120         if (ret < 0) {
 121                 free(dss_error_txt);
 122                 return 0;
 123         }
 124         if (num > now)
 125                 return 0;
 126         s->completion_time = num;
 127         s->flags = SS_COMPLETE;
 128         if (strcmp(dot + 1, "being_deleted"))
 129                 s->flags |= SS_BEING_DELETED;
 130 success:
 131         s->name = dss_strdup(dirname);
 132         return 1;
 133 }
 134
 135 int64_t get_current_time(void)
 136 {
 137         time_t now;
 138         time(&now);
 139         DSS_DEBUG_LOG("now: %lli\n", (long long) now);
 140         return (int64_t)now;
 141 }
 142
 143 char *incomplete_name(int64_t start)
 144 {
 145         return make_message("%lli-incomplete", (long long)start);
 146 }
 147
 148 char *being_deleted_name(struct snapshot *s)
 149 {
 150         if (s->flags & SS_COMPLETE)
 151                 return make_message("%lli-%lli.being_deleted",
 152                         (long long)s->creation_time,
 153                         (long long)s->completion_time);
 154         return make_message("%lli-incomplete.being_deleted",
 155                 (long long)s->creation_time);
 156 }
 157
 158 int complete_name(int64_t start, int64_t end, char **result)
 159 {
 160         struct tm start_tm, end_tm;
 161         time_t *start_seconds = (time_t *) (uint64_t *)&start; /* STFU, gcc */
 162         time_t *end_seconds = (time_t *) (uint64_t *)&end; /* STFU, gcc */
 163         char start_str[200], end_str[200];
 164
 165         if (!localtime_r(start_seconds, &start_tm)) {
 166                 make_err_msg("%lli", (long long)start);
 167                 return -E_LOCALTIME;
 168         }
 169         if (!localtime_r(end_seconds, &end_tm)) {
 170                 make_err_msg("%lli", (long long)end);
 171                 return -E_LOCALTIME;
 172         }
 173         if (!strftime(start_str, sizeof(start_str), "%a_%b_%d_%Y_%H_%M_%S", &start_tm)) {
 174                 make_err_msg("%lli", (long long)start);
 175                 return -E_STRFTIME;
 176         }
 177         if (!strftime(end_str, sizeof(end_str), "%a_%b_%d_%Y_%H_%M_%S", &end_tm)) {
 178                 make_err_msg("%lli", (long long)end);
 179                 return -E_STRFTIME;
 180         }
 181         *result = make_message("%lli-%lli.%s-%s", (long long) start, (long long) end,
 182                 start_str, end_str);
 183         return 1;
 184 }
 185
 186 struct snapshot_list {
 187         int64_t now;
 188         unsigned num_snapshots;
 189         unsigned array_size;
 190         struct snapshot **snapshots;
 191         /**
 192          * Array of size num_intervals + 1
 193          *
 194          * It contains the number of snapshots in each interval. interval_count[num_intervals]
 195          * is the number of snapshots which belong to any interval greater than num_intervals.
 196          */
 197         unsigned *interval_count;
 198 };
 199
 200 #define FOR_EACH_SNAPSHOT(s, i, sl) \
 201         for ((i) = 0; (i) < (sl)->num_snapshots && ((s) = (sl)->snapshots[(i)]); (i)++)
 202
 203
 204
 205 #define NUM_COMPARE(x, y) ((int)((x) < (y)) - (int)((x) > (y)))
 206
 207 static int compare_snapshots(const void *a, const void *b)
 208 {
 209         struct snapshot *s1 = *(struct snapshot **)a;
 210         struct snapshot *s2 = *(struct snapshot **)b;
 211         return NUM_COMPARE(s2->creation_time, s1->creation_time);
 212 }
 213
 214 /** Compute the minimum of \a a and \a b. */
 215 #define DSS_MIN(a,b) ((a) < (b) ? (a) : (b))
 216
 217 int add_snapshot(const char *dirname, void *private)
 218 {
 219         struct snapshot_list *sl = private;
 220         struct snapshot s;
 221         int ret = is_snapshot(dirname, sl->now, &s);
 222
 223         if (!ret)
 224                 return 1;
 225         if (sl->num_snapshots >= sl->array_size) {
 226                 sl->array_size = 2 * sl->array_size + 1;
 227                 sl->snapshots = dss_realloc(sl->snapshots,
 228                         sl->array_size * sizeof(struct snapshot *));
 229         }
 230         sl->snapshots[sl->num_snapshots] = dss_malloc(sizeof(struct snapshot));
 231         *(sl->snapshots[sl->num_snapshots]) = s;
 232         sl->interval_count[DSS_MIN(s.interval, conf.num_intervals_arg)]++;
 233         sl->num_snapshots++;
 234         return 1;
 235 }
 236
 237 void get_snapshot_list(struct snapshot_list *sl)
 238 {
 239         sl->now = get_current_time();
 240         sl->num_snapshots = 0;
 241         sl->array_size = 0;
 242         sl->snapshots = NULL;
 243         sl->interval_count = dss_calloc((conf.num_intervals_arg + 1) * sizeof(unsigned));
 244         for_each_subdir(add_snapshot, sl);
 245         qsort(sl->snapshots, sl->num_snapshots, sizeof(struct snapshot *),
 246                 compare_snapshots);
 247 }
 248
 249 void free_snapshot_list(struct snapshot_list *sl)
 250 {
 251         int i;
 252         struct snapshot *s;
 253
 254         FOR_EACH_SNAPSHOT(s, i, sl) {
 255                 free(s->name);
 256                 free(s);
 257         }
 258         free(sl->interval_count);
 259         free(sl->snapshots);
 260 }
 261
 262 /**
 263  * Print a log message about the exit status of a child.
 264  */
 265 void log_termination_msg(pid_t pid, int status)
 266 {
 267         if (WIFEXITED(status))
 268                 DSS_INFO_LOG("child %i exited. Exit status: %i\n", (int)pid,
 269                         WEXITSTATUS(status));
 270         else if (WIFSIGNALED(status))
 271                 DSS_NOTICE_LOG("child %i was killed by signal %i\n", (int)pid,
 272                         WTERMSIG(status));
 273         else
 274                 DSS_WARNING_LOG("child %i terminated abormally\n", (int)pid);
 275 }
 276
 277 int wait_for_process(pid_t pid, int *status)
 278 {
 279         int ret;
 280
 281         DSS_DEBUG_LOG("Waiting for process %d to terminate\n", (int)pid);
 282         for (;;) {
 283                 ret = waitpid(pid, status, 0);
 284                 if (ret >= 0 || errno != EINTR)
 285                         break;
 286         }
 287         if (ret < 0) {
 288                 ret = -ERRNO_TO_DSS_ERROR(errno);
 289                 make_err_msg("failed to wait for process %d", (int)pid);
 290         } else
 291                 log_termination_msg(pid, *status);
 292         return ret;
 293 }
 294
 295 int remove_snapshot(struct snapshot *s, pid_t *pid)
 296 {
 297         int fds[3] = {0, 0, 0};
 298         char *new_name = being_deleted_name(s);
 299         int ret = dss_rename(s->name, new_name);
 300         char *argv[] = {"rm", "-rf", new_name, NULL};
 301
 302         if (ret < 0)
 303                 goto out;
 304         DSS_NOTICE_LOG("removing %s (interval = %i)\n", s->name, s->interval);
 305         ret = dss_exec(pid, argv[0], argv, fds);
 306 out:
 307         free(new_name);
 308         return ret;
 309 }
 310
 311 int remove_redundant_snapshot(struct snapshot_list *sl,
 312                 int dry_run, pid_t *pid)
 313 {
 314         int ret, i, interval;
 315         struct snapshot *s;
 316         unsigned missing = 0;
 317
 318         DSS_INFO_LOG("looking for intervals containing too many snapshots\n");
 319         for (interval = conf.num_intervals_arg - 1; interval >= 0; interval--) {
 320                 unsigned keep = 1<<(conf.num_intervals_arg - interval - 1);
 321                 unsigned num = sl->interval_count[interval];
 322                 struct snapshot *victim = NULL, *prev = NULL;
 323                 int64_t score = LONG_MAX;
 324
 325                 if (keep >= num)
 326                         missing += keep - num;
 327                 DSS_DEBUG_LOG("interval %i: keep: %u, have: %u, missing: %u\n",
 328                         interval, keep, num, missing);
 329                 if (keep + missing >= num)
 330                         continue;
 331                 /* redundant snapshot in this interval, pick snapshot with lowest score */
 332                 FOR_EACH_SNAPSHOT(s, i, sl) {
 333                         int64_t this_score;
 334
 335                         DSS_DEBUG_LOG("checking %s\n", s->name);
 336                         if (s->interval > interval) {
 337                                 prev = s;
 338                                 continue;
 339                         }
 340                         if (s->interval < interval)
 341                                 break;
 342                         if (!victim) {
 343                                 victim = s;
 344                                 prev = s;
 345                                 continue;
 346                         }
 347                         assert(prev);
 348                         /* check if s is a better victim */
 349                         this_score = s->creation_time - prev->creation_time;
 350                         assert(this_score >= 0);
 351                         DSS_DEBUG_LOG("%s: score %lli\n", s->name, (long long)score);
 352                         if (this_score < score) {
 353                                 score = this_score;
 354                                 victim = s;
 355                         }
 356                         prev = s;
 357                 }
 358                 assert(victim);
 359                 if (dry_run) {
 360                         printf("%s would be removed (interval = %i)\n",
 361                                 victim->name, victim->interval);
 362                         continue;
 363                 }
 364                 ret = remove_snapshot(victim, pid);
 365                 return ret < 0? ret : 1;
 366         }
 367         return 0;
 368 }
 369
 370 int remove_old_snapshot(struct snapshot_list *sl, int dry_run, pid_t *pid)
 371 {
 372         int i, ret;
 373         struct snapshot *s;
 374
 375         DSS_INFO_LOG("looking for snapshots belonging to intervals greater than %d\n",
 376                 conf.num_intervals_arg);
 377         FOR_EACH_SNAPSHOT(s, i, sl) {
 378                 if (s->interval <= conf.num_intervals_arg)
 379                         continue;
 380                 if (dry_run) {
 381                         printf("%s would be removed (interval = %i)\n",
 382                                 s->name, s->interval);
 383                         continue;
 384                 }
 385                 ret = remove_snapshot(s, pid);
 386                 if (ret < 0)
 387                         return ret;
 388                 return 1;
 389         }
 390         return 0;
 391 }
 392
 393 int wait_for_rm_process(pid_t pid)
 394 {
 395         int status, es, ret = wait_for_process(pid, &status);
 396         if (ret < 0)
 397                 return ret;
 398         if (!WIFEXITED(status)) {
 399                 ret = E_INVOLUNTARY_EXIT;
 400                 make_err_msg("rm process %d died involuntary", (int)pid);
 401                 return ret;
 402         }
 403         es = WEXITSTATUS(status);
 404         if (es) {
 405                 ret = -E_BAD_EXIT_CODE;
 406                 make_err_msg("rm process %d returned %d", (int)pid, es);
 407                 return ret;
 408         }
 409         return 1;
 410 }
 411
 412 int com_run(void)
 413 {
 414         return 42;
 415 }
 416
 417 int com_prune(void)
 418 {
 419         int ret, dry_run = 0;
 420         struct snapshot_list sl;
 421         pid_t pid;
 422
 423         for (;;) {
 424                 get_snapshot_list(&sl);
 425                 ret = remove_old_snapshot(&sl, dry_run, &pid);
 426                 free_snapshot_list(&sl);
 427                 if (ret < 0)
 428                         return ret;
 429                 if (!ret)
 430                         break;
 431                 ret = wait_for_rm_process(pid);
 432                 if (ret < 0)
 433                         goto out;
 434         }
 435         for (;;) {
 436                 get_snapshot_list(&sl);
 437                 ret = remove_redundant_snapshot(&sl, dry_run, &pid);
 438                 free_snapshot_list(&sl);
 439                 if (ret < 0)
 440                         return ret;
 441                 if (!ret)
 442                         break;
 443                 ret = wait_for_rm_process(pid);
 444                 if (ret < 0)
 445                         goto out;
 446         }
 447         return 1;
 448 out:
 449         return ret;
 450 }
 451
 452 struct newest_snapshot_data {
 453         char * newest_name;
 454         int64_t newest_creation_time;
 455         int64_t now;
 456 };
 457
 458 int get_newest_complete(const char *dirname, void *private)
 459 {
 460         struct newest_snapshot_data *nsd = private;
 461         struct snapshot s;
 462         int ret = is_snapshot(dirname, nsd->now, &s);
 463
 464         if (ret <= 0)
 465                 return 1;
 466         if (s.creation_time < nsd->newest_creation_time)
 467                 return 1;
 468         nsd->newest_creation_time = s.creation_time;
 469         free(nsd->newest_name);
 470         nsd->newest_name = s.name;
 471         return 1;
 472 }
 473
 474 __malloc char *name_of_newest_complete_snapshot(void)
 475 {
 476         struct newest_snapshot_data nsd = {
 477                 .now = get_current_time(),
 478                 .newest_creation_time = -1
 479         };
 480         for_each_subdir(get_newest_complete, &nsd);
 481         return nsd.newest_name;
 482 }
 483
 484 void create_rsync_argv(char ***argv, int64_t *num)
 485 {
 486         char *logname, *newest = name_of_newest_complete_snapshot();
 487         int i = 0, j;
 488
 489         *argv = dss_malloc((15 + conf.rsync_option_given) * sizeof(char *));
 490         (*argv)[i++] = dss_strdup("rsync");
 491         (*argv)[i++] = dss_strdup("-aq");
 492         (*argv)[i++] = dss_strdup("--delete");
 493         for (j = 0; j < conf.rsync_option_given; j++)
 494                 (*argv)[i++] = dss_strdup(conf.rsync_option_arg[j]);
 495         if (newest) {
 496                 DSS_INFO_LOG("using %s as reference snapshot\n", newest);
 497                 (*argv)[i++] = make_message("--link-dest=../%s", newest);
 498                 free(newest);
 499         } else
 500                 DSS_INFO_LOG("no previous snapshot found");
 501         if (conf.exclude_patterns_given) {
 502                 (*argv)[i++] = dss_strdup("--exclude-from");
 503                 (*argv)[i++] = dss_strdup(conf.exclude_patterns_arg);
 504
 505         }
 506         logname = dss_logname();
 507         if (conf.remote_user_given && !strcmp(conf.remote_user_arg, logname))
 508                 (*argv)[i++] = dss_strdup(conf.source_dir_arg);
 509         else
 510                 (*argv)[i++] = make_message("%s@%s:%s/", conf.remote_user_given?
 511                         conf.remote_user_arg : logname,
 512                         conf.remote_host_arg, conf.source_dir_arg);
 513         free(logname);
 514         *num = get_current_time();
 515         (*argv)[i++] = incomplete_name(*num);
 516         (*argv)[i++] = NULL;
 517         for (j = 0; j < i; j++)
 518                 DSS_DEBUG_LOG("argv[%d] = %s\n", j, (*argv)[j]);
 519 }
 520
 521 void free_rsync_argv(char **argv)
 522 {
 523         int i;
 524         for (i = 0; argv[i]; i++)
 525                 free(argv[i]);
 526         free(argv);
 527 }
 528
 529 int create_snapshot(char **argv, pid_t *pid)
 530 {
 531         int fds[3] = {0, 0, 0};
 532
 533         return dss_exec(pid, argv[0], argv, fds);
 534 }
 535
 536 int rename_incomplete_snapshot(int64_t start)
 537 {
 538         char *old_name, *new_name;
 539         int ret;
 540
 541         ret = complete_name(start, get_current_time(), &new_name);
 542         if (ret < 0)
 543                 return ret;
 544         old_name = incomplete_name(start);
 545         ret = dss_rename(old_name, new_name);
 546         if (ret >= 0)
 547                 DSS_NOTICE_LOG("%s -> %s\n", old_name, new_name);
 548         free(old_name);
 549         free(new_name);
 550         return ret;
 551 }
 552
 553 int com_create(void)
 554 {
 555         int ret, status, es;
 556         char **rsync_argv;
 557         int64_t snapshot_num;
 558         pid_t pid;
 559
 560         create_rsync_argv(&rsync_argv, &snapshot_num);
 561         DSS_NOTICE_LOG("creating snapshot %lli\n", (long long)snapshot_num);
 562         ret = create_snapshot(rsync_argv, &pid);
 563         if (ret < 0)
 564                 goto out;
 565         ret = wait_for_process(pid, &status);
 566         if (ret < 0)
 567                 goto out;
 568         if (!WIFEXITED(status)) {
 569                 ret = E_INVOLUNTARY_EXIT;
 570                 make_err_msg("rsync process %d died involuntary", (int)pid);
 571                 goto out;
 572         }
 573         es = WEXITSTATUS(status);
 574         if (es != 0 && es != 23 && es != 24) {
 575                 ret = -E_BAD_EXIT_CODE;
 576                 make_err_msg("rsync process %d returned %d", (int)pid, es);
 577                 goto out;
 578         }
 579         ret = rename_incomplete_snapshot(snapshot_num);
 580 out:
 581         free_rsync_argv(rsync_argv);
 582         return ret;
 583 }
 584
 585 int com_ls(void)
 586 {
 587         int i;
 588         struct snapshot_list sl;
 589         struct snapshot *s;
 590         get_snapshot_list(&sl);
 591         FOR_EACH_SNAPSHOT(s, i, &sl)
 592                 printf("%u\t%s\n", s->interval, s->name);
 593         free_snapshot_list(&sl);
 594         return 1;
 595 }
 596
 597 /* TODO: Unlink pid file */
 598 __noreturn void clean_exit(int status)
 599 {
 600         //kill(0, SIGTERM);
 601         free(dss_error_txt);
 602         exit(status);
 603 }
 604
 605 __printf_2_3 void dss_log(int ll, const char* fmt,...)
 606 {
 607         va_list argp;
 608         if (ll < conf.loglevel_arg)
 609                 return;
 610         va_start(argp, fmt);
 611         vfprintf(stderr, fmt, argp);
 612         va_end(argp);
 613 }
 614
 615 int read_config_file(void)
 616 {
 617         int ret;
 618         char *config_file;
 619         struct stat statbuf;
 620
 621         if (conf.config_file_given)
 622                 config_file = dss_strdup(conf.config_file_arg);
 623         else {
 624                 char *home = get_homedir();
 625                 config_file = make_message("%s/.dssrc", home);
 626                 free(home);
 627         }
 628         ret = stat(config_file, &statbuf);
 629         if (ret && conf.config_file_given) {
 630                 ret = -ERRNO_TO_DSS_ERROR(errno);
 631                 make_err_msg("failed to stat config file %s", config_file);
 632                 goto out;
 633         }
 634         if (!ret) {
 635                 struct cmdline_parser_params params = {
 636                         .override = 0,
 637                         .initialize = 0,
 638                         .check_required = 0,
 639                         .check_ambiguity = 0
 640                 };
 641                 cmdline_parser_config_file(config_file, &conf, &params);
 642         }
 643         if (!conf.source_dir_given || !conf.dest_dir_given) {
 644                 ret = -E_SYNTAX;
 645                 make_err_msg("you need to specify both source_dir and dest_dir");
 646                 goto out;
 647         }
 648         ret = 1;
 649 out:
 650         free(config_file);
 651         return ret;
 652 }
 653
 654 int check_config(void)
 655 {
 656         if (conf.unit_interval_arg <= 0) {
 657                 make_err_msg("bad unit interval: %i", conf.unit_interval_arg);
 658                 return -E_INVALID_NUMBER;
 659         }
 660         DSS_DEBUG_LOG("unit interval: %i day(s)\n", conf.unit_interval_arg);
 661         if (conf.num_intervals_arg <= 0) {
 662                 make_err_msg("bad number of intervals  %i", conf.num_intervals_arg);
 663                 return -E_INVALID_NUMBER;
 664         }
 665         DSS_DEBUG_LOG("number of intervals: %i\n", conf.num_intervals_arg);
 666         return 1;
 667 }
 668
 669 int main(int argc, char **argv)
 670 {
 671         int ret;
 672
 673         cmdline_parser(argc, argv, &conf); /* aborts on errors */
 674         if (conf.inputs_num) {
 675                 ret = -E_SYNTAX;
 676                 make_err_msg("additional non-options given");
 677                 goto out;
 678         }
 679         ret = read_config_file();
 680         if (ret < 0)
 681                 goto out;
 682         ret = check_config();
 683         if (ret < 0)
 684                 goto out;
 685         ret = dss_chdir(conf.dest_dir_arg);
 686         if (ret < 0)
 687                 goto out;
 688         ret = call_command_handler();
 689 out:
 690         if (ret < 0)
 691                 log_err_msg(EMERG, -ret);
 692         clean_exit(ret >= 0? EXIT_SUCCESS : EXIT_FAILURE);
 693 }