multipathd/main.c

   1 /*
   2  * Copyright (c) 2004, 2005 Christophe Varoqui
   3  * Copyright (c) 2005 Kiyoshi Ueda, NEC
   4  * Copyright (c) 2005 Benjamin Marzinski, Redhat
   5  * Copyright (c) 2005 Edward Goggin, EMC
   6  */
   7 #include <unistd.h>
   8 #include <sys/stat.h>
   9 #include <libdevmapper.h>
  10 #include <wait.h>
  11 #include <sys/mman.h>
  12 #include <sys/types.h>
  13 #include <fcntl.h>
  14 #include <errno.h>
  15 #include <sys/time.h>
  16 #include <sys/resource.h>
  17 #include <limits.h>
  18
  19 /*
  20  * libcheckers
  21  */
  22 #include <checkers.h>
  23
  24 /*
  25  * libmultipath
  26  */
  27 #include <parser.h>
  28 #include <vector.h>
  29 #include <memory.h>
  30 #include <config.h>
  31 #include <util.h>
  32 #include <hwtable.h>
  33 #include <defaults.h>
  34 #include <structs.h>
  35 #include <callout.h>
  36 #include <blacklist.h>
  37 #include <structs_vec.h>
  38 #include <dmparser.h>
  39 #include <devmapper.h>
  40 #include <sysfs.h>
  41 #include <dict.h>
  42 #include <discovery.h>
  43 #include <debug.h>
  44 #include <propsel.h>
  45 #include <uevent.h>
  46 #include <switchgroup.h>
  47 #include <print.h>
  48 #include <configure.h>
  49 #include <prio.h>
  50
  51 #include "main.h"
  52 #include "pidfile.h"
  53 #include "uxlsnr.h"
  54 #include "uxclnt.h"
  55 #include "cli.h"
  56 #include "cli_handlers.h"
  57 #include "lock.h"
  58 #include "waiter.h"
  59
  60 #define FILE_NAME_SIZE 256
  61 #define CMDSIZE 160
  62
  63 #define LOG_MSG(a,b) \
  64         if (strlen(b)) condlog(a, "%s: %s", pp->dev, b);
  65
  66 pthread_cond_t exit_cond = PTHREAD_COND_INITIALIZER;
  67 pthread_mutex_t exit_mutex = PTHREAD_MUTEX_INITIALIZER;
  68
  69 int logsink;
  70
  71 /*
  72  * global copy of vecs for use in sig handlers
  73  */
  74 struct vectors * gvecs;
  75
  76 static int
  77 need_switch_pathgroup (struct multipath * mpp, int refresh)
  78 {
  79         struct pathgroup * pgp;
  80         struct path * pp;
  81         unsigned int i, j;
  82
  83         if (!mpp || mpp->pgfailback == -FAILBACK_MANUAL)
  84                 return 0;
  85
  86         /*
  87          * Refresh path priority values
  88          */
  89         if (refresh)
  90                 vector_foreach_slot (mpp->pg, pgp, i)
  91                         vector_foreach_slot (pgp->paths, pp, j)
  92                                 pathinfo(pp, conf->hwtable, DI_PRIO);
  93
  94         mpp->bestpg = select_path_group(mpp);
  95
  96         if (mpp->bestpg != mpp->nextpg)
  97                 return 1;
  98
  99         return 0;
 100 }
 101
 102 static void
 103 switch_pathgroup (struct multipath * mpp)
 104 {
 105         mpp->stat_switchgroup++;
 106         dm_switchgroup(mpp->alias, mpp->bestpg);
 107         condlog(2, "%s: switch to path group #%i",
 108                  mpp->alias, mpp->bestpg);
 109 }
 110
 111 static int
 112 coalesce_maps(struct vectors *vecs, vector nmpv)
 113 {
 114         struct multipath * ompp;
 115         vector ompv = vecs->mpvec;
 116         unsigned int i;
 117         int j;
 118
 119         vector_foreach_slot (ompv, ompp, i) {
 120                 if (!find_mp_by_wwid(nmpv, ompp->wwid)) {
 121                         /*
 122                          * remove all current maps not allowed by the
 123                          * current configuration
 124                          */
 125                         if (dm_flush_map(ompp->alias)) {
 126                                 condlog(0, "%s: unable to flush devmap",
 127                                         ompp->alias);
 128                                 /*
 129                                  * may be just because the device is open
 130                                  */
 131                                 if (!vector_alloc_slot(nmpv))
 132                                         return 1;
 133
 134                                 vector_set_slot(nmpv, ompp);
 135                                 setup_multipath(vecs, ompp);
 136
 137                                 if ((j = find_slot(ompv, (void *)ompp)) != -1)
 138                                         vector_del_slot(ompv, j);
 139
 140                                 continue;
 141                         }
 142                         else {
 143                                 dm_lib_release();
 144                                 condlog(2, "%s devmap removed", ompp->alias);
 145                         }
 146                 }
 147         }
 148         return 0;
 149 }
 150
 151 void
 152 sync_map_state(struct multipath *mpp)
 153 {
 154         struct pathgroup *pgp;
 155         struct path *pp;
 156         unsigned int i, j;
 157
 158         if (!mpp->pg)
 159                 return;
 160
 161         vector_foreach_slot (mpp->pg, pgp, i){
 162                 vector_foreach_slot (pgp->paths, pp, j){
 163                         if (pp->state == PATH_UNCHECKED ||
 164                             pp->state == PATH_WILD)
 165                                 continue;
 166                         if ((pp->dmstate == PSTATE_FAILED ||
 167                              pp->dmstate == PSTATE_UNDEF) &&
 168                             (pp->state == PATH_UP || pp->state == PATH_GHOST))
 169                                 dm_reinstate_path(mpp->alias, pp->dev_t);
 170                         else if ((pp->dmstate == PSTATE_ACTIVE ||
 171                                   pp->dmstate == PSTATE_UNDEF) &&
 172                                  (pp->state == PATH_DOWN ||
 173                                   pp->state == PATH_SHAKY))
 174                                 dm_fail_path(mpp->alias, pp->dev_t);
 175                 }
 176         }
 177 }
 178
 179 static void
 180 sync_maps_state(vector mpvec)
 181 {
 182         unsigned int i;
 183         struct multipath *mpp;
 184
 185         vector_foreach_slot (mpvec, mpp, i)
 186                 sync_map_state(mpp);
 187 }
 188
 189 static int
 190 flush_map(struct multipath * mpp, struct vectors * vecs)
 191 {
 192         /*
 193          * clear references to this map before flushing so we can ignore
 194          * the spurious uevent we may generate with the dm_flush_map call below
 195          */
 196         if (dm_flush_map(mpp->alias)) {
 197                 /*
 198                  * May not really be an error -- if the map was already flushed
 199                  * from the device mapper by dmsetup(8) for instance.
 200                  */
 201                 condlog(0, "%s: can't flush", mpp->alias);
 202                 return 1;
 203         }
 204         else {
 205                 dm_lib_release();
 206                 condlog(2, "%s: devmap removed", mpp->alias);
 207         }
 208
 209         orphan_paths(vecs->pathvec, mpp);
 210         remove_map_and_stop_waiter(mpp, vecs, 1);
 211
 212         return 0;
 213 }
 214
 215 static int
 216 uev_add_map (struct sysfs_device * dev, struct vectors * vecs)
 217 {
 218         condlog(2, "%s: add map (uevent)", dev->kernel);
 219         return ev_add_map(dev, vecs);
 220 }
 221
 222 int
 223 ev_add_map (struct sysfs_device * dev, struct vectors * vecs)
 224 {
 225         char * alias;
 226         char *dev_t;
 227         int major, minor;
 228         char * refwwid;
 229         struct multipath * mpp;
 230         int map_present;
 231         int r = 1;
 232
 233         dev_t = sysfs_attr_get_value(dev->devpath, "dev");
 234
 235         if (!dev_t || sscanf(dev_t, "%d:%d", &major, &minor) != 2)
 236                 return 1;
 237
 238         alias = dm_mapname(major, minor);
 239
 240         if (!alias)
 241                 return 1;
 242
 243         map_present = dm_map_present(alias);
 244
 245         if (map_present && dm_type(alias, TGT_MPATH) <= 0) {
 246                 condlog(4, "%s: not a multipath map", alias);
 247                 FREE(alias);
 248                 return 0;
 249         }
 250
 251         mpp = find_mp_by_alias(vecs->mpvec, alias);
 252
 253         if (mpp) {
 254                 /*
 255                  * Not really an error -- we generate our own uevent
 256                  * if we create a multipath mapped device as a result
 257                  * of uev_add_path
 258                  */
 259                 condlog(0, "%s: devmap already registered",
 260                         dev->kernel);
 261                 FREE(alias);
 262                 return 0;
 263         }
 264
 265         /*
 266          * now we can register the map
 267          */
 268         if (map_present && (mpp = add_map_without_path(vecs, minor, alias))) {
 269                 sync_map_state(mpp);
 270                 condlog(2, "%s: devmap %s added", alias, dev->kernel);
 271                 return 0;
 272         }
 273         refwwid = get_refwwid(dev->kernel, DEV_DEVMAP, vecs->pathvec);
 274
 275         if (refwwid) {
 276                 r = coalesce_paths(vecs, NULL, refwwid, 0);
 277                 dm_lib_release();
 278         }
 279
 280         if (!r)
 281                 condlog(2, "%s: devmap %s added", alias, dev->kernel);
 282         else
 283                 condlog(0, "%s: uev_add_map %s failed", alias, dev->kernel);
 284
 285         FREE(refwwid);
 286         FREE(alias);
 287         return r;
 288 }
 289
 290 static int
 291 uev_remove_map (struct sysfs_device * dev, struct vectors * vecs)
 292 {
 293         condlog(2, "%s: remove map (uevent)", dev->kernel);
 294         return ev_remove_map(dev->kernel, vecs);
 295 }
 296
 297 int
 298 ev_remove_map (char * devname, struct vectors * vecs)
 299 {
 300         struct multipath * mpp;
 301
 302         mpp = find_mp_by_str(vecs->mpvec, devname);
 303
 304         if (!mpp) {
 305                 condlog(2, "%s: devmap not registered, can't remove",
 306                         devname);
 307                 return 0;
 308         }
 309         flush_map(mpp, vecs);
 310
 311         return 0;
 312 }
 313
 314 static int
 315 uev_umount_map (struct sysfs_device * dev, struct vectors * vecs)
 316 {
 317         struct multipath * mpp;
 318
 319         condlog(2, "%s: umount map (uevent)", dev->kernel);
 320
 321         mpp = find_mp_by_str(vecs->mpvec, dev->kernel);
 322
 323         if (!mpp)
 324                 return 0;
 325
 326         update_mpp_paths(mpp, vecs->pathvec);
 327         verify_paths(mpp, vecs, NULL);
 328
 329         if (!VECTOR_SIZE(mpp->paths))
 330                 flush_map(mpp, vecs);
 331
 332         return 0;
 333 }
 334
 335 static int
 336 uev_add_path (struct sysfs_device * dev, struct vectors * vecs)
 337 {
 338         condlog(2, "%s: add path (uevent)", dev->kernel);
 339         return (ev_add_path(dev->kernel, vecs) != 1)? 0 : 1;
 340 }
 341
 342
 343 /*
 344  * returns:
 345  * 0: added
 346  * 1: error
 347  * 2: blacklisted
 348  */
 349 int
 350 ev_add_path (char * devname, struct vectors * vecs)
 351 {
 352         struct multipath * mpp;
 353         struct path * pp;
 354         char empty_buff[WWID_SIZE] = {0};
 355
 356         pp = find_path_by_dev(vecs->pathvec, devname);
 357
 358         if (pp) {
 359                 condlog(0, "%s: spurious uevent, path already in pathvec",
 360                         devname);
 361                 if (pp->mpp)
 362                         return 0;
 363         }
 364         else {
 365                 /*
 366                  * get path vital state
 367                  */
 368                 if (!(pp = store_pathinfo(vecs->pathvec, conf->hwtable,
 369                       devname, DI_ALL))) {
 370                         condlog(0, "%s: failed to store path info", devname);
 371                         return 1;
 372                 }
 373                 pp->checkint = conf->checkint;
 374         }
 375
 376         /*
 377          * need path UID to go any further
 378          */
 379         if (memcmp(empty_buff, pp->wwid, WWID_SIZE) == 0) {
 380                 condlog(0, "%s: failed to get path uid", devname);
 381                 return 1; /* leave path added to pathvec */
 382         }
 383         if (filter_path(conf, pp) > 0){
 384                 int i = find_slot(vecs->pathvec, (void *)pp);
 385                 if (i != -1)
 386                         vector_del_slot(vecs->pathvec, i);
 387                 free_path(pp);
 388                 return 2;
 389         }
 390         mpp = pp->mpp = find_mp_by_wwid(vecs->mpvec, pp->wwid);
 391 rescan:
 392         if (mpp) {
 393                 if (adopt_paths(vecs->pathvec, mpp))
 394                         return 1; /* leave path added to pathvec */
 395
 396                 verify_paths(mpp, vecs, NULL);
 397                 mpp->flush_on_last_del = FLUSH_UNDEF;
 398                 mpp->action = ACT_RELOAD;
 399         }
 400         else {
 401                 if ((mpp = add_map_with_path(vecs, pp, 1)))
 402                         mpp->action = ACT_CREATE;
 403                 else
 404                         return 1; /* leave path added to pathvec */
 405         }
 406
 407         /*
 408          * push the map to the device-mapper
 409          */
 410         if (setup_map(mpp)) {
 411                 condlog(0, "%s: failed to setup map for addition of new "
 412                         "path %s", mpp->alias, devname);
 413                 goto out;
 414         }
 415         /*
 416          * reload the map for the multipath mapped device
 417          */
 418         if (domap(mpp) <= 0) {
 419                 condlog(0, "%s: failed in domap for addition of new "
 420                         "path %s", mpp->alias, devname);
 421                 /*
 422                  * deal with asynchronous uevents :((
 423                  */
 424                 if (mpp->action == ACT_RELOAD) {
 425                         condlog(0, "%s: uev_add_path sleep", mpp->alias);
 426                         sleep(1);
 427                         update_mpp_paths(mpp, vecs->pathvec);
 428                         goto rescan;
 429                 }
 430                 else
 431                         goto out;
 432         }
 433         dm_lib_release();
 434
 435         /*
 436          * update our state from kernel regardless of create or reload
 437          */
 438         if (setup_multipath(vecs, mpp))
 439                 goto out;
 440
 441         sync_map_state(mpp);
 442
 443         if (mpp->action == ACT_CREATE &&
 444             start_waiter_thread(mpp, vecs))
 445                         goto out;
 446
 447         condlog(2, "%s path added to devmap %s", devname, mpp->alias);
 448         return 0;
 449
 450 out:
 451         remove_map(mpp, vecs, 1);
 452         return 1;
 453 }
 454
 455 static int
 456 uev_remove_path (struct sysfs_device * dev, struct vectors * vecs)
 457 {
 458         int retval;
 459
 460         condlog(2, "%s: remove path (uevent)", dev->kernel);
 461         retval = ev_remove_path(dev->kernel, vecs);
 462         if (!retval)
 463                 sysfs_device_put(dev);
 464
 465         return retval;
 466 }
 467
 468 int
 469 ev_remove_path (char * devname, struct vectors * vecs)
 470 {
 471         struct multipath * mpp;
 472         struct path * pp;
 473         int i, retval = 0;
 474
 475         pp = find_path_by_dev(vecs->pathvec, devname);
 476
 477         if (!pp) {
 478                 condlog(0, "%s: spurious uevent, path not in pathvec", devname);
 479                 return 1;
 480         }
 481
 482         /*
 483          * avoid referring to the map of an orphaned path
 484          */
 485         if ((mpp = pp->mpp)) {
 486                 /*
 487                  * transform the mp->pg vector of vectors of paths
 488                  * into a mp->params string to feed the device-mapper
 489                  */
 490                 if (update_mpp_paths(mpp, vecs->pathvec)) {
 491                         condlog(0, "%s: failed to update paths",
 492                                 mpp->alias);
 493                         goto fail;
 494                 }
 495                 if ((i = find_slot(mpp->paths, (void *)pp)) != -1)
 496                         vector_del_slot(mpp->paths, i);
 497
 498                 /*
 499                  * remove the map IFF removing the last path
 500                  */
 501                 if (VECTOR_SIZE(mpp->paths) == 0) {
 502                         char alias[WWID_SIZE];
 503
 504                         /*
 505                          * flush_map will fail if the device is open
 506                          */
 507                         strncpy(alias, mpp->alias, WWID_SIZE);
 508                         if (mpp->flush_on_last_del == FLUSH_ENABLED) {
 509                                 condlog(2, "%s Last path deleted, disabling queueing", mpp->alias);
 510                                 mpp->retry_tick = 0;
 511                                 mpp->no_path_retry = NO_PATH_RETRY_FAIL;
 512                                 mpp->flush_on_last_del = FLUSH_IN_PROGRESS;
 513                                 dm_queue_if_no_path(mpp->alias, 0);
 514                         }
 515                         if (!flush_map(mpp, vecs)) {
 516                                 condlog(2, "%s: removed map after"
 517                                         " removing all paths",
 518                                         alias);
 519                                 retval = 0;
 520                                 goto out;
 521                         }
 522                         /*
 523                          * Not an error, continue
 524                          */
 525                 }
 526
 527                 if (setup_map(mpp)) {
 528                         condlog(0, "%s: failed to setup map for"
 529                                 " removal of path %s", mpp->alias,
 530                                 devname);
 531                         goto fail;
 532                 }
 533                 /*
 534                  * reload the map
 535                  */
 536                 mpp->action = ACT_RELOAD;
 537                 if (domap(mpp) <= 0) {
 538                         condlog(0, "%s: failed in domap for "
 539                                 "removal of path %s",
 540                                 mpp->alias, devname);
 541                         retval = 1;
 542                 } else {
 543                         /*
 544                          * update our state from kernel
 545                          */
 546                         if (setup_multipath(vecs, mpp)) {
 547                                 goto fail;
 548                         }
 549                         sync_map_state(mpp);
 550
 551                         condlog(2, "%s: path removed from map %s",
 552                                 devname, mpp->alias);
 553                 }
 554         }
 555
 556 out:
 557         if ((i = find_slot(vecs->pathvec, (void *)pp)) != -1)
 558                 vector_del_slot(vecs->pathvec, i);
 559
 560         free_path(pp);
 561
 562         return retval;
 563
 564 fail:
 565         remove_map_and_stop_waiter(mpp, vecs, 1);
 566         return 1;
 567 }
 568
 569 static int
 570 map_discovery (struct vectors * vecs)
 571 {
 572         struct multipath * mpp;
 573         unsigned int i;
 574
 575         if (dm_get_maps(vecs->mpvec))
 576                 return 1;
 577
 578         vector_foreach_slot (vecs->mpvec, mpp, i)
 579                 if (setup_multipath(vecs, mpp))
 580                         return 1;
 581
 582         return 0;
 583 }
 584
 585 int
 586 uxsock_trigger (char * str, char ** reply, int * len, void * trigger_data)
 587 {
 588         struct vectors * vecs;
 589         int r;
 590
 591         *reply = NULL;
 592         *len = 0;
 593         vecs = (struct vectors *)trigger_data;
 594
 595         pthread_cleanup_push(cleanup_lock, &vecs->lock);
 596         lock(vecs->lock);
 597
 598         r = parse_cmd(str, reply, len, vecs);
 599
 600         if (r > 0) {
 601                 *reply = STRDUP("fail\n");
 602                 *len = strlen(*reply) + 1;
 603                 r = 1;
 604         }
 605         else if (!r && *len == 0) {
 606                 *reply = STRDUP("ok\n");
 607                 *len = strlen(*reply) + 1;
 608                 r = 0;
 609         }
 610         /* else if (r < 0) leave *reply alone */
 611
 612         lock_cleanup_pop(vecs->lock);
 613         return r;
 614 }
 615
 616 static int
 617 uev_discard(char * devpath)
 618 {
 619         char *tmp;
 620         char a[11], b[11];
 621
 622         /*
 623          * keep only block devices, discard partitions
 624          */
 625         tmp = strstr(devpath, "/block/");
 626         if (tmp == NULL){
 627                 condlog(4, "no /block/ in '%s'", devpath);
 628                 return 1;
 629         }
 630         if (sscanf(tmp, "/block/%10s", a) != 1 ||
 631             sscanf(tmp, "/block/%10[^/]/%10s", a, b) == 2) {
 632                 condlog(4, "discard event on %s", devpath);
 633                 return 1;
 634         }
 635         return 0;
 636 }
 637
 638 int
 639 uev_trigger (struct uevent * uev, void * trigger_data)
 640 {
 641         int r = 0;
 642         struct sysfs_device *sysdev;
 643         struct vectors * vecs;
 644
 645         vecs = (struct vectors *)trigger_data;
 646
 647         if (uev_discard(uev->devpath))
 648                 return 0;
 649
 650         sysdev = sysfs_device_get(uev->devpath);
 651         if(!sysdev)
 652                 return 0;
 653
 654         lock(vecs->lock);
 655
 656         /*
 657          * device map event
 658          * Add events are ignored here as the tables
 659          * are not fully initialised then.
 660          */
 661         if (!strncmp(sysdev->kernel, "dm-", 3)) {
 662                 if (!strncmp(uev->action, "change", 6)) {
 663                         r = uev_add_map(sysdev, vecs);
 664                         goto out;
 665                 }
 666                 if (!strncmp(uev->action, "remove", 6)) {
 667                         r = uev_remove_map(sysdev, vecs);
 668                         goto out;
 669                 }
 670                 if (!strncmp(uev->action, "umount", 6)) {
 671                         r = uev_umount_map(sysdev, vecs);
 672                         goto out;
 673                 }
 674                 goto out;
 675         }
 676
 677         /*
 678          * path add/remove event
 679          */
 680         if (filter_devnode(conf->blist_devnode, conf->elist_devnode,
 681                            sysdev->kernel) > 0)
 682                 goto out;
 683
 684         if (!strncmp(uev->action, "add", 3)) {
 685                 r = uev_add_path(sysdev, vecs);
 686                 goto out;
 687         }
 688         if (!strncmp(uev->action, "remove", 6)) {
 689                 r = uev_remove_path(sysdev, vecs);
 690                 goto out;
 691         }
 692
 693 out:
 694         unlock(vecs->lock);
 695         return r;
 696 }
 697
 698 static void *
 699 ueventloop (void * ap)
 700 {
 701         block_signal(SIGUSR1, NULL);
 702         block_signal(SIGHUP, NULL);
 703
 704         if (uevent_listen(&uev_trigger, ap))
 705                 fprintf(stderr, "error starting uevent listener");
 706
 707         return NULL;
 708 }
 709
 710 static void *
 711 uxlsnrloop (void * ap)
 712 {
 713         block_signal(SIGUSR1, NULL);
 714         block_signal(SIGHUP, NULL);
 715
 716         if (cli_init())
 717                 return NULL;
 718
 719         set_handler_callback(LIST+PATHS, cli_list_paths);
 720         set_handler_callback(LIST+PATHS+FMT, cli_list_paths_fmt);
 721         set_handler_callback(LIST+MAPS, cli_list_maps);
 722         set_handler_callback(LIST+STATUS, cli_list_status);
 723         set_handler_callback(LIST+MAPS+STATUS, cli_list_maps_status);
 724         set_handler_callback(LIST+MAPS+STATS, cli_list_maps_stats);
 725         set_handler_callback(LIST+MAPS+FMT, cli_list_maps_fmt);
 726         set_handler_callback(LIST+MAPS+TOPOLOGY, cli_list_maps_topology);
 727         set_handler_callback(LIST+TOPOLOGY, cli_list_maps_topology);
 728         set_handler_callback(LIST+MAP+TOPOLOGY, cli_list_map_topology);
 729         set_handler_callback(LIST+CONFIG, cli_list_config);
 730         set_handler_callback(LIST+BLACKLIST, cli_list_blacklist);
 731         set_handler_callback(LIST+DEVICES, cli_list_devices);
 732         set_handler_callback(LIST+WILDCARDS, cli_list_wildcards);
 733         set_handler_callback(ADD+PATH, cli_add_path);
 734         set_handler_callback(DEL+PATH, cli_del_path);
 735         set_handler_callback(ADD+MAP, cli_add_map);
 736         set_handler_callback(DEL+MAP, cli_del_map);
 737         set_handler_callback(SWITCH+MAP+GROUP, cli_switch_group);
 738         set_handler_callback(RECONFIGURE, cli_reconfigure);
 739         set_handler_callback(SUSPEND+MAP, cli_suspend);
 740         set_handler_callback(RESUME+MAP, cli_resume);
 741         set_handler_callback(RESIZE+MAP, cli_resize);
 742         set_handler_callback(REINSTATE+PATH, cli_reinstate);
 743         set_handler_callback(FAIL+PATH, cli_fail);
 744         set_handler_callback(DISABLEQ+MAP, cli_disable_queueing);
 745         set_handler_callback(RESTOREQ+MAP, cli_restore_queueing);
 746         set_handler_callback(DISABLEQ+MAPS, cli_disable_all_queueing);
 747         set_handler_callback(RESTOREQ+MAPS, cli_restore_all_queueing);
 748         set_handler_callback(QUIT, cli_quit);
 749
 750         uxsock_listen(&uxsock_trigger, ap);
 751
 752         return NULL;
 753 }
 754
 755 static int
 756 exit_daemon (int status)
 757 {
 758         if (status != 0)
 759                 fprintf(stderr, "bad exit status. see daemon.log\n");
 760
 761         condlog(3, "unlink pidfile");
 762         unlink(DEFAULT_PIDFILE);
 763
 764         pthread_mutex_lock(&exit_mutex);
 765         pthread_cond_signal(&exit_cond);
 766         pthread_mutex_unlock(&exit_mutex);
 767
 768         return status;
 769 }
 770
 771 static void
 772 fail_path (struct path * pp, int del_active)
 773 {
 774         if (!pp->mpp)
 775                 return;
 776
 777         condlog(2, "checker failed path %s in map %s",
 778                  pp->dev_t, pp->mpp->alias);
 779
 780         dm_fail_path(pp->mpp->alias, pp->dev_t);
 781         if (del_active)
 782                 update_queue_mode_del_path(pp->mpp);
 783 }
 784
 785 /*
 786  * caller must have locked the path list before calling that function
 787  */
 788 static void
 789 reinstate_path (struct path * pp, int add_active)
 790 {
 791         if (!pp->mpp)
 792                 return;
 793
 794         if (dm_reinstate_path(pp->mpp->alias, pp->dev_t))
 795                 condlog(0, "%s: reinstate failed", pp->dev_t);
 796         else {
 797                 condlog(2, "%s: reinstated", pp->dev_t);
 798                 if (add_active)
 799                         update_queue_mode_add_path(pp->mpp);
 800         }
 801 }
 802
 803 static void
 804 enable_group(struct path * pp)
 805 {
 806         struct pathgroup * pgp;
 807
 808         /*
 809          * if path is added through uev_add_path, pgindex can be unset.
 810          * next update_strings() will set it, upon map reload event.
 811          *
 812          * we can safely return here, because upon map reload, all
 813          * PG will be enabled.
 814          */
 815         if (!pp->mpp->pg || !pp->pgindex)
 816                 return;
 817
 818         pgp = VECTOR_SLOT(pp->mpp->pg, pp->pgindex - 1);
 819
 820         if (pgp->status == PGSTATE_DISABLED) {
 821                 condlog(2, "%s: enable group #%i", pp->mpp->alias, pp->pgindex);
 822                 dm_enablegroup(pp->mpp->alias, pp->pgindex);
 823         }
 824 }
 825
 826 static void
 827 mpvec_garbage_collector (struct vectors * vecs)
 828 {
 829         struct multipath * mpp;
 830         unsigned int i;
 831
 832         if (!vecs->mpvec)
 833                 return;
 834
 835         vector_foreach_slot (vecs->mpvec, mpp, i) {
 836                 if (mpp && mpp->alias && !dm_map_present(mpp->alias)) {
 837                         condlog(2, "%s: remove dead map", mpp->alias);
 838                         remove_map_and_stop_waiter(mpp, vecs, 1);
 839                         i--;
 840                 }
 841         }
 842 }
 843
 844 static void
 845 defered_failback_tick (vector mpvec)
 846 {
 847         struct multipath * mpp;
 848         unsigned int i;
 849
 850         vector_foreach_slot (mpvec, mpp, i) {
 851                 /*
 852                  * defered failback getting sooner
 853                  */
 854                 if (mpp->pgfailback > 0 && mpp->failback_tick > 0) {
 855                         mpp->failback_tick--;
 856
 857                         if (!mpp->failback_tick && need_switch_pathgroup(mpp, 1))
 858                                 switch_pathgroup(mpp);
 859                 }
 860         }
 861 }
 862
 863 static void
 864 retry_count_tick(vector mpvec)
 865 {
 866         struct multipath *mpp;
 867         unsigned int i;
 868
 869         vector_foreach_slot (mpvec, mpp, i) {
 870                 if (mpp->retry_tick) {
 871                         mpp->stat_total_queueing_time++;
 872                         condlog(4, "%s: Retrying.. No active path", mpp->alias);
 873                         if(--mpp->retry_tick == 0) {
 874                                 dm_queue_if_no_path(mpp->alias, 0);
 875                                 condlog(2, "%s: Disable queueing", mpp->alias);
 876                         }
 877                 }
 878         }
 879 }
 880
 881 void
 882 check_path (struct vectors * vecs, struct path * pp)
 883 {
 884         int newstate;
 885
 886         if (!pp->mpp)
 887                 return;
 888
 889         if (pp->tick && --pp->tick)
 890                 return; /* don't check this path yet */
 891
 892         /*
 893          * provision a next check soonest,
 894          * in case we exit abnormaly from here
 895          */
 896         pp->tick = conf->checkint;
 897
 898         if (!checker_selected(&pp->checker)) {
 899                 pathinfo(pp, conf->hwtable, DI_SYSFS);
 900                 select_checker(pp);
 901         }
 902         if (!checker_selected(&pp->checker)) {
 903                 condlog(0, "%s: checker is not set", pp->dev);
 904                 return;
 905         }
 906         /*
 907          * Set checker in async mode.
 908          * Honored only by checker implementing the said mode.
 909          */
 910         checker_set_async(&pp->checker);
 911
 912         if (path_offline(pp))
 913                 newstate = PATH_DOWN;
 914         else
 915                 newstate = checker_check(&pp->checker);
 916
 917         if (newstate < 0) {
 918                 condlog(2, "%s: unusable path", pp->dev);
 919                 pathinfo(pp, conf->hwtable, 0);
 920                 return;
 921         }
 922         /*
 923          * Async IO in flight. Keep the previous path state
 924          * and reschedule as soon as possible
 925          */
 926         if (newstate == PATH_PENDING) {
 927                 pp->tick = 1;
 928                 return;
 929         }
 930         if (newstate != pp->state) {
 931                 int oldstate = pp->state;
 932                 pp->state = newstate;
 933                 LOG_MSG(1, checker_message(&pp->checker));
 934
 935                 /*
 936                  * upon state change, reset the checkint
 937                  * to the shortest delay
 938                  */
 939                 pp->checkint = conf->checkint;
 940
 941                 if (newstate == PATH_DOWN || newstate == PATH_SHAKY ||
 942                     update_multipath_strings(pp->mpp, vecs->pathvec)) {
 943                         /*
 944                          * proactively fail path in the DM
 945                          */
 946                         if (oldstate == PATH_UP ||
 947                             oldstate == PATH_GHOST)
 948                                 fail_path(pp, 1);
 949                         else
 950                                 fail_path(pp, 0);
 951
 952                         /*
 953                          * cancel scheduled failback
 954                          */
 955                         pp->mpp->failback_tick = 0;
 956
 957                         pp->mpp->stat_path_failures++;
 958                         return;
 959                 }
 960
 961                 /*
 962                  * reinstate this path
 963                  */
 964                 if (oldstate != PATH_UP &&
 965                     oldstate != PATH_GHOST)
 966                         reinstate_path(pp, 1);
 967                 else
 968                         reinstate_path(pp, 0);
 969
 970                 /*
 971                  * schedule [defered] failback
 972                  */
 973                 if (pp->mpp->pgfailback > 0)
 974                         pp->mpp->failback_tick =
 975                                 pp->mpp->pgfailback + 1;
 976                 else if (pp->mpp->pgfailback == -FAILBACK_IMMEDIATE &&
 977                     need_switch_pathgroup(pp->mpp, 1))
 978                         switch_pathgroup(pp->mpp);
 979
 980                 /*
 981                  * if at least one path is up in a group, and
 982                  * the group is disabled, re-enable it
 983                  */
 984                 if (newstate == PATH_UP)
 985                         enable_group(pp);
 986         }
 987         else if (newstate == PATH_UP || newstate == PATH_GHOST) {
 988                 LOG_MSG(4, checker_message(&pp->checker));
 989                 /*
 990                  * double the next check delay.
 991                  * max at conf->max_checkint
 992                  */
 993                 if (pp->checkint < (conf->max_checkint / 2))
 994                         pp->checkint = 2 * pp->checkint;
 995                 else
 996                         pp->checkint = conf->max_checkint;
 997
 998                 pp->tick = pp->checkint;
 999                 condlog(4, "%s: delay next check %is",
1000                                 pp->dev_t, pp->tick);
1001         }
1002         else if (newstate == PATH_DOWN)
1003                 LOG_MSG(2, checker_message(&pp->checker));
1004
1005         pp->state = newstate;
1006
1007         /*
1008          * path prio refreshing
1009          */
1010         condlog(4, "path prio refresh");
1011         pathinfo(pp, conf->hwtable, DI_PRIO);
1012
1013         /*
1014          * pathgroup failback policy
1015          */
1016         if (need_switch_pathgroup(pp->mpp, 0)) {
1017                 if (pp->mpp->pgfailback > 0 &&
1018                     pp->mpp->failback_tick <= 0)
1019                         pp->mpp->failback_tick =
1020                                 pp->mpp->pgfailback + 1;
1021                 else if (pp->mpp->pgfailback ==
1022                                 -FAILBACK_IMMEDIATE)
1023                         switch_pathgroup(pp->mpp);
1024         }
1025 }
1026
1027 static void *
1028 checkerloop (void *ap)
1029 {
1030         struct vectors *vecs;
1031         struct path *pp;
1032         int count = 0;
1033         unsigned int i;
1034         sigset_t old;
1035
1036         mlockall(MCL_CURRENT | MCL_FUTURE);
1037         vecs = (struct vectors *)ap;
1038         condlog(2, "path checkers start up");
1039
1040         /*
1041          * init the path check interval
1042          */
1043         vector_foreach_slot (vecs->pathvec, pp, i) {
1044                 pp->checkint = conf->checkint;
1045         }
1046
1047         while (1) {
1048                 block_signal(SIGHUP, &old);
1049                 pthread_cleanup_push(cleanup_lock, &vecs->lock);
1050                 lock(vecs->lock);
1051                 condlog(4, "tick");
1052
1053                 if (vecs->pathvec) {
1054                         vector_foreach_slot (vecs->pathvec, pp, i) {
1055                                 check_path(vecs, pp);
1056                         }
1057                 }
1058                 if (vecs->mpvec) {
1059                         defered_failback_tick(vecs->mpvec);
1060                         retry_count_tick(vecs->mpvec);
1061                 }
1062                 if (count)
1063                         count--;
1064                 else {
1065                         condlog(4, "map garbage collection");
1066                         mpvec_garbage_collector(vecs);
1067                         count = MAPGCINT;
1068                 }
1069
1070                 lock_cleanup_pop(vecs->lock);
1071                 pthread_sigmask(SIG_SETMASK, &old, NULL);
1072                 sleep(1);
1073         }
1074         return NULL;
1075 }
1076
1077 int
1078 configure (struct vectors * vecs, int start_waiters)
1079 {
1080         struct multipath * mpp;
1081         struct path * pp;
1082         vector mpvec;
1083         int i;
1084
1085         if (!vecs->pathvec && !(vecs->pathvec = vector_alloc()))
1086                 return 1;
1087
1088         if (!vecs->mpvec && !(vecs->mpvec = vector_alloc()))
1089                 return 1;
1090
1091         if (!(mpvec = vector_alloc()))
1092                 return 1;
1093
1094         /*
1095          * probe for current path (from sysfs) and map (from dm) sets
1096          */
1097         path_discovery(vecs->pathvec, conf, DI_ALL);
1098
1099         vector_foreach_slot (vecs->pathvec, pp, i){
1100                 if (filter_path(conf, pp) > 0){
1101                         vector_del_slot(vecs->pathvec, i);
1102                         free_path(pp);
1103                         i--;
1104                 }
1105                 else
1106                         pp->checkint = conf->checkint;
1107         }
1108         if (map_discovery(vecs))
1109                 return 1;
1110
1111         /*
1112          * create new set of maps & push changed ones into dm
1113          */
1114         if (coalesce_paths(vecs, mpvec, NULL, 0))
1115                 return 1;
1116
1117         /*
1118          * may need to remove some maps which are no longer relevant
1119          * e.g., due to blacklist changes in conf file
1120          */
1121         if (coalesce_maps(vecs, mpvec))
1122                 return 1;
1123
1124         dm_lib_release();
1125
1126         sync_maps_state(mpvec);
1127
1128         /*
1129          * purge dm of old maps
1130          */
1131         remove_maps(vecs);
1132
1133         /*
1134          * save new set of maps formed by considering current path state
1135          */
1136         vector_free(vecs->mpvec);
1137         vecs->mpvec = mpvec;
1138
1139         /*
1140          * start dm event waiter threads for these new maps
1141          */
1142         vector_foreach_slot(vecs->mpvec, mpp, i) {
1143                 if (setup_multipath(vecs, mpp))
1144                         return 1;
1145                 if (start_waiters)
1146                         if (start_waiter_thread(mpp, vecs))
1147                                 return 1;
1148         }
1149         return 0;
1150 }
1151
1152 int
1153 reconfigure (struct vectors * vecs)
1154 {
1155         struct config * old = conf;
1156
1157         /*
1158          * free old map and path vectors ... they use old conf state
1159          */
1160         if (VECTOR_SIZE(vecs->mpvec))
1161                 remove_maps_and_stop_waiters(vecs);
1162
1163         if (VECTOR_SIZE(vecs->pathvec))
1164                 free_pathvec(vecs->pathvec, FREE_PATHS);
1165
1166         vecs->pathvec = NULL;
1167         conf = NULL;
1168
1169         if (load_config(DEFAULT_CONFIGFILE))
1170                 return 1;
1171
1172         conf->verbosity = old->verbosity;
1173
1174         if (!conf->checkint) {
1175                 conf->checkint = DEFAULT_CHECKINT;
1176                 conf->max_checkint = MAX_CHECKINT(conf->checkint);
1177         }
1178         configure(vecs, 1);
1179         free_config(old);
1180         return 0;
1181 }
1182
1183 static struct vectors *
1184 init_vecs (void)
1185 {
1186         struct vectors * vecs;
1187
1188         vecs = (struct vectors *)MALLOC(sizeof(struct vectors));
1189
1190         if (!vecs)
1191                 return NULL;
1192
1193         vecs->lock.mutex =
1194                 (pthread_mutex_t *)MALLOC(sizeof(pthread_mutex_t));
1195
1196         if (!vecs->lock.mutex)
1197                 goto out;
1198
1199         pthread_mutex_init(vecs->lock.mutex, NULL);
1200         vecs->lock.depth = 0;
1201
1202         return vecs;
1203
1204 out:
1205         FREE(vecs);
1206         condlog(0, "failed to init paths");
1207         return NULL;
1208 }
1209
1210 static void *
1211 signal_set(int signo, void (*func) (int))
1212 {
1213         int r;
1214         struct sigaction sig;
1215         struct sigaction osig;
1216
1217         sig.sa_handler = func;
1218         sigemptyset(&sig.sa_mask);
1219         sig.sa_flags = 0;
1220
1221         r = sigaction(signo, &sig, &osig);
1222
1223         if (r < 0)
1224                 return (SIG_ERR);
1225         else
1226                 return (osig.sa_handler);
1227 }
1228
1229 static void
1230 sighup (int sig)
1231 {
1232         condlog(2, "reconfigure (SIGHUP)");
1233
1234         lock(gvecs->lock);
1235         reconfigure(gvecs);
1236         unlock(gvecs->lock);
1237
1238 #ifdef _DEBUG_
1239         dbg_free_final(NULL);
1240 #endif
1241 }
1242
1243 static void
1244 sigend (int sig)
1245 {
1246         exit_daemon(0);
1247 }
1248
1249 static void
1250 sigusr1 (int sig)
1251 {
1252         condlog(3, "SIGUSR1 received");
1253 }
1254
1255 static void
1256 signal_init(void)
1257 {
1258         signal_set(SIGHUP, sighup);
1259         signal_set(SIGUSR1, sigusr1);
1260         signal_set(SIGINT, sigend);
1261         signal_set(SIGTERM, sigend);
1262         signal(SIGPIPE, SIG_IGN);
1263 }
1264
1265 static void
1266 setscheduler (void)
1267 {
1268         int res;
1269         static struct sched_param sched_param = {
1270                 .sched_priority = 99
1271         };
1272
1273         res = sched_setscheduler (0, SCHED_RR, &sched_param);
1274
1275         if (res == -1)
1276                 condlog(LOG_WARNING, "Could not set SCHED_RR at priority 99");
1277         return;
1278 }
1279
1280 static void
1281 set_oom_adj (int val)
1282 {
1283         FILE *fp;
1284
1285         fp = fopen("/proc/self/oom_adj", "w");
1286
1287         if (!fp)
1288                 return;
1289
1290         fprintf(fp, "%i", val);
1291         fclose(fp);
1292 }
1293
1294 void
1295 setup_thread_attr(pthread_attr_t *attr, size_t stacksize, int detached)
1296 {
1297         if (pthread_attr_init(attr)) {
1298                 fprintf(stderr, "can't initialize thread attr: %s\n",
1299                         strerror(errno));
1300                 exit(1);
1301         }
1302         if (stacksize < PTHREAD_STACK_MIN)
1303                 stacksize = PTHREAD_STACK_MIN;
1304
1305         if (pthread_attr_setstacksize(attr, stacksize)) {
1306                 fprintf(stderr, "can't set thread stack size to %lu: %s\n",
1307                         (unsigned long)stacksize, strerror(errno));
1308                 exit(1);
1309         }
1310         if (detached && pthread_attr_setdetachstate(attr,
1311                                                     PTHREAD_CREATE_DETACHED)) {
1312                 fprintf(stderr, "can't set thread to detached: %s\n",
1313                         strerror(errno));
1314                 exit(1);
1315         }
1316 }
1317
1318 static int
1319 child (void * param)
1320 {
1321         pthread_t check_thr, uevent_thr, uxlsnr_thr;
1322         pthread_attr_t log_attr, misc_attr;
1323         struct vectors * vecs;
1324
1325         mlockall(MCL_CURRENT | MCL_FUTURE);
1326
1327         setup_thread_attr(&misc_attr, 64 * 1024, 1);
1328         setup_thread_attr(&waiter_attr, 32 * 1024, 1);
1329
1330         if (logsink) {
1331                 setup_thread_attr(&log_attr, 64 * 1024, 0);
1332                 log_thread_start(&log_attr);
1333                 pthread_attr_destroy(&log_attr);
1334         }
1335
1336         condlog(2, "--------start up--------");
1337         condlog(2, "read " DEFAULT_CONFIGFILE);
1338
1339         if (load_config(DEFAULT_CONFIGFILE))
1340                 exit(1);
1341
1342         if (init_checkers()) {
1343                 condlog(0, "failed to initialize checkers");
1344                 exit(1);
1345         }
1346         if (init_prio()) {
1347                 condlog(0, "failed to initialize prioritizers");
1348                 exit(1);
1349         }
1350
1351         setlogmask(LOG_UPTO(conf->verbosity + 3));
1352
1353         /*
1354          * fill the voids left in the config file
1355          */
1356         if (!conf->checkint) {
1357                 conf->checkint = DEFAULT_CHECKINT;
1358                 conf->max_checkint = MAX_CHECKINT(conf->checkint);
1359         }
1360
1361         if (conf->max_fds) {
1362                 struct rlimit fd_limit;
1363                 if (conf->max_fds > 0) {
1364                         fd_limit.rlim_cur = conf->max_fds;
1365                         fd_limit.rlim_max = conf->max_fds;
1366                 }
1367                 else {
1368                         fd_limit.rlim_cur = RLIM_INFINITY;
1369                         fd_limit.rlim_max = RLIM_INFINITY;
1370                 }
1371                 if (setrlimit(RLIMIT_NOFILE, &fd_limit) < 0)
1372                         condlog(0, "can't set open fds limit to %d : %s\n",
1373                                 conf->max_fds, strerror(errno));
1374         }
1375
1376         if (pidfile_create(DEFAULT_PIDFILE, getpid())) {
1377                 if (logsink)
1378                         log_thread_stop();
1379
1380                 exit(1);
1381         }
1382         signal_init();
1383         setscheduler();
1384         set_oom_adj(-16);
1385         vecs = gvecs = init_vecs();
1386
1387         if (!vecs)
1388                 exit(1);
1389
1390         if (sysfs_init(conf->sysfs_dir, FILE_NAME_SIZE)) {
1391                 condlog(0, "can not find sysfs mount point");
1392                 exit(1);
1393         }
1394         conf->daemon = 1;
1395         /*
1396          * fetch and configure both paths and multipaths
1397          */
1398         if (configure(vecs, 1)) {
1399                 condlog(0, "failure during configuration");
1400                 exit(1);
1401         }
1402         /*
1403          * start threads
1404          */
1405         pthread_create(&check_thr, &misc_attr, checkerloop, vecs);
1406         pthread_create(&uevent_thr, &misc_attr, ueventloop, vecs);
1407         pthread_create(&uxlsnr_thr, &misc_attr, uxlsnrloop, vecs);
1408         pthread_attr_destroy(&misc_attr);
1409
1410         pthread_cond_wait(&exit_cond, &exit_mutex);
1411
1412         /*
1413          * exit path
1414          */
1415         block_signal(SIGHUP, NULL);
1416         lock(vecs->lock);
1417         remove_maps_and_stop_waiters(vecs);
1418         free_pathvec(vecs->pathvec, FREE_PATHS);
1419
1420         pthread_cancel(check_thr);
1421         pthread_cancel(uevent_thr);
1422         pthread_cancel(uxlsnr_thr);
1423
1424         sysfs_cleanup();
1425
1426         free_keys(keys);
1427         keys = NULL;
1428         free_handlers(handlers);
1429         handlers = NULL;
1430         free_polls();
1431
1432         unlock(vecs->lock);
1433         /* Now all the waitevent threads will start rushing in. */
1434         while (vecs->lock.depth > 0) {
1435                 sleep (1); /* This is weak. */
1436                 condlog(3,"Have %d wait event checkers threads to de-alloc, waiting..\n", vecs->lock.depth);
1437         }
1438         pthread_mutex_destroy(vecs->lock.mutex);
1439         FREE(vecs->lock.mutex);
1440         vecs->lock.depth = 0;
1441         vecs->lock.mutex = NULL;
1442         FREE(vecs);
1443         vecs = NULL;
1444
1445         condlog(2, "--------shut down-------");
1446
1447         if (logsink)
1448                 log_thread_stop();
1449
1450         dm_lib_release();
1451         dm_lib_exit();
1452
1453         cleanup_prio();
1454         cleanup_checkers();
1455         /*
1456          * Freeing config must be done after condlog() and dm_lib_exit(),
1457          * because logging functions like dlog() and dm_write_log()
1458          * reference the config.
1459          */
1460         free_config(conf);
1461         conf = NULL;
1462
1463 #ifdef _DEBUG_
1464         dbg_free_final(NULL);
1465 #endif
1466
1467         exit(0);
1468 }
1469
1470 static int
1471 daemonize(void)
1472 {
1473         int pid;
1474         int in_fd, out_fd;
1475
1476         if( (pid = fork()) < 0){
1477                 fprintf(stderr, "Failed first fork : %s\n", strerror(errno));
1478                 return -1;
1479         }
1480         else if (pid != 0)
1481                 return pid;
1482
1483         setsid();
1484
1485         if ( (pid = fork()) < 0)
1486                 fprintf(stderr, "Failed second fork : %s\n", strerror(errno));
1487         else if (pid != 0)
1488                 _exit(0);
1489
1490         in_fd = open("/dev/null", O_RDONLY);
1491         if (in_fd < 0){
1492                 fprintf(stderr, "cannot open /dev/null for input : %s\n",
1493                         strerror(errno));
1494                 _exit(0);
1495         }
1496         out_fd = open("/dev/console", O_WRONLY);
1497         if (out_fd < 0){
1498                 fprintf(stderr, "cannot open /dev/console for output : %s\n",
1499                         strerror(errno));
1500                 _exit(0);
1501         }
1502
1503         close(STDIN_FILENO);
1504         dup(in_fd);
1505         close(STDOUT_FILENO);
1506         dup(out_fd);
1507         close(STDERR_FILENO);
1508         dup(out_fd);
1509
1510         close(in_fd);
1511         close(out_fd);
1512         if (chdir("/") < 0)
1513                 fprintf(stderr, "cannot chdir to '/', continuing\n");
1514
1515         return 0;
1516 }
1517
1518 int
1519 main (int argc, char *argv[])
1520 {
1521         extern char *optarg;
1522         extern int optind;
1523         int arg;
1524         int err;
1525
1526         logsink = 1;
1527         dm_init();
1528
1529         if (getuid() != 0) {
1530                 fprintf(stderr, "need to be root\n");
1531                 exit(1);
1532         }
1533
1534         /* make sure we don't lock any path */
1535         chdir("/");
1536         umask(umask(077) | 022);
1537
1538         conf = alloc_config();
1539
1540         if (!conf)
1541                 exit(1);
1542
1543         while ((arg = getopt(argc, argv, ":dv:k::")) != EOF ) {
1544         switch(arg) {
1545                 case 'd':
1546                         logsink = 0;
1547                         //debug=1; /* ### comment me out ### */
1548                         break;
1549                 case 'v':
1550                         if (sizeof(optarg) > sizeof(char *) ||
1551                             !isdigit(optarg[0]))
1552                                 exit(1);
1553
1554                         conf->verbosity = atoi(optarg);
1555                         break;
1556                 case 'k':
1557                         uxclnt(optarg);
1558                         exit(0);
1559                 default:
1560                         ;
1561                 }
1562         }
1563         if (optind < argc) {
1564                 char cmd[CMDSIZE];
1565                 char * s = cmd;
1566                 char * c = s;
1567
1568                 while (optind < argc) {
1569                         if (strchr(argv[optind], ' '))
1570                                 c += snprintf(c, s + CMDSIZE - c, "\"%s\" ", argv[optind]);
1571                         else
1572                                 c += snprintf(c, s + CMDSIZE - c, "%s ", argv[optind]);
1573                         optind++;
1574                 }
1575                 c += snprintf(c, s + CMDSIZE - c, "\n");
1576                 uxclnt(s);
1577                 exit(0);
1578         }
1579
1580         if (!logsink)
1581                 err = 0;
1582         else
1583                 err = daemonize();
1584
1585         if (err < 0)
1586                 /* error */
1587                 exit(1);
1588         else if (err > 0)
1589                 /* parent dies */
1590                 exit(0);
1591         else
1592                 /* child lives */
1593                 return (child(NULL));
1594 }
1595