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         if (strstr(devname, "..") != NULL) {
 357                 /*
 358                  * Don't allow relative device names in the pathvec
 359                  */
 360                 condlog(0, "%s: path name is invalid", devname);
 361                 return 1;
 362         }
 363
 364         pp = find_path_by_dev(vecs->pathvec, devname);
 365
 366         if (pp) {
 367                 condlog(0, "%s: spurious uevent, path already in pathvec",
 368                         devname);
 369                 if (pp->mpp)
 370                         return 0;
 371         }
 372         else {
 373                 /*
 374                  * get path vital state
 375                  */
 376                 if (!(pp = store_pathinfo(vecs->pathvec, conf->hwtable,
 377                       devname, DI_ALL))) {
 378                         condlog(0, "%s: failed to store path info", devname);
 379                         return 1;
 380                 }
 381                 pp->checkint = conf->checkint;
 382         }
 383
 384         /*
 385          * need path UID to go any further
 386          */
 387         if (memcmp(empty_buff, pp->wwid, WWID_SIZE) == 0) {
 388                 condlog(0, "%s: failed to get path uid", devname);
 389                 return 1; /* leave path added to pathvec */
 390         }
 391         if (filter_path(conf, pp) > 0){
 392                 int i = find_slot(vecs->pathvec, (void *)pp);
 393                 if (i != -1)
 394                         vector_del_slot(vecs->pathvec, i);
 395                 free_path(pp);
 396                 return 2;
 397         }
 398         mpp = pp->mpp = find_mp_by_wwid(vecs->mpvec, pp->wwid);
 399 rescan:
 400         if (mpp) {
 401                 condlog(4,"%s: adopting all paths for path %s",
 402                         mpp->alias, pp->dev);
 403                 if (adopt_paths(vecs->pathvec, mpp))
 404                         return 1; /* leave path added to pathvec */
 405
 406                 verify_paths(mpp, vecs, NULL);
 407                 mpp->flush_on_last_del = FLUSH_UNDEF;
 408                 mpp->action = ACT_RELOAD;
 409         }
 410         else {
 411                 condlog(4,"%s: creating new map", pp->dev);
 412                 if ((mpp = add_map_with_path(vecs, pp, 1)))
 413                         mpp->action = ACT_CREATE;
 414                 else
 415                         return 1; /* leave path added to pathvec */
 416         }
 417
 418         /*
 419          * push the map to the device-mapper
 420          */
 421         if (setup_map(mpp)) {
 422                 condlog(0, "%s: failed to setup map for addition of new "
 423                         "path %s", mpp->alias, devname);
 424                 goto out;
 425         }
 426         /*
 427          * reload the map for the multipath mapped device
 428          */
 429         if (domap(mpp) <= 0) {
 430                 condlog(0, "%s: failed in domap for addition of new "
 431                         "path %s", mpp->alias, devname);
 432                 /*
 433                  * deal with asynchronous uevents :((
 434                  */
 435                 if (mpp->action == ACT_RELOAD) {
 436                         condlog(0, "%s: uev_add_path sleep", mpp->alias);
 437                         sleep(1);
 438                         update_mpp_paths(mpp, vecs->pathvec);
 439                         goto rescan;
 440                 }
 441                 else
 442                         goto out;
 443         }
 444         dm_lib_release();
 445
 446         /*
 447          * update our state from kernel regardless of create or reload
 448          */
 449         if (setup_multipath(vecs, mpp))
 450                 goto out;
 451
 452         sync_map_state(mpp);
 453
 454         if (mpp->action == ACT_CREATE &&
 455             start_waiter_thread(mpp, vecs))
 456                         goto out;
 457
 458         condlog(2, "%s path added to devmap %s", devname, mpp->alias);
 459         return 0;
 460
 461 out:
 462         remove_map(mpp, vecs, 1);
 463         return 1;
 464 }
 465
 466 static int
 467 uev_remove_path (struct sysfs_device * dev, struct vectors * vecs)
 468 {
 469         int retval;
 470
 471         condlog(2, "%s: remove path (uevent)", dev->kernel);
 472         retval = ev_remove_path(dev->kernel, vecs);
 473         if (!retval)
 474                 sysfs_device_put(dev);
 475
 476         return retval;
 477 }
 478
 479 int
 480 ev_remove_path (char * devname, struct vectors * vecs)
 481 {
 482         struct multipath * mpp;
 483         struct path * pp;
 484         int i, retval = 0;
 485
 486         pp = find_path_by_dev(vecs->pathvec, devname);
 487
 488         if (!pp) {
 489                 /* Not an error; path might have been purged earlier */
 490                 condlog(0, "%s: path already removed", devname);
 491                 return 0;
 492         }
 493
 494         /*
 495          * avoid referring to the map of an orphaned path
 496          */
 497         if ((mpp = pp->mpp)) {
 498                 /*
 499                  * transform the mp->pg vector of vectors of paths
 500                  * into a mp->params string to feed the device-mapper
 501                  */
 502                 if (update_mpp_paths(mpp, vecs->pathvec)) {
 503                         condlog(0, "%s: failed to update paths",
 504                                 mpp->alias);
 505                         goto fail;
 506                 }
 507                 if ((i = find_slot(mpp->paths, (void *)pp)) != -1)
 508                         vector_del_slot(mpp->paths, i);
 509
 510                 /*
 511                  * remove the map IFF removing the last path
 512                  */
 513                 if (VECTOR_SIZE(mpp->paths) == 0) {
 514                         char alias[WWID_SIZE];
 515
 516                         /*
 517                          * flush_map will fail if the device is open
 518                          */
 519                         strncpy(alias, mpp->alias, WWID_SIZE);
 520                         if (mpp->flush_on_last_del == FLUSH_ENABLED) {
 521                                 condlog(2, "%s Last path deleted, disabling queueing", mpp->alias);
 522                                 mpp->retry_tick = 0;
 523                                 mpp->no_path_retry = NO_PATH_RETRY_FAIL;
 524                                 mpp->flush_on_last_del = FLUSH_IN_PROGRESS;
 525                                 dm_queue_if_no_path(mpp->alias, 0);
 526                         }
 527                         if (!flush_map(mpp, vecs)) {
 528                                 condlog(2, "%s: removed map after"
 529                                         " removing all paths",
 530                                         alias);
 531                                 retval = 0;
 532                                 goto out;
 533                         }
 534                         /*
 535                          * Not an error, continue
 536                          */
 537                 }
 538
 539                 if (setup_map(mpp)) {
 540                         condlog(0, "%s: failed to setup map for"
 541                                 " removal of path %s", mpp->alias,
 542                                 devname);
 543                         goto fail;
 544                 }
 545                 /*
 546                  * reload the map
 547                  */
 548                 mpp->action = ACT_RELOAD;
 549                 if (domap(mpp) <= 0) {
 550                         condlog(0, "%s: failed in domap for "
 551                                 "removal of path %s",
 552                                 mpp->alias, devname);
 553                         retval = 1;
 554                 } else {
 555                         /*
 556                          * update our state from kernel
 557                          */
 558                         if (setup_multipath(vecs, mpp)) {
 559                                 goto fail;
 560                         }
 561                         sync_map_state(mpp);
 562
 563                         condlog(2, "%s: path removed from map %s",
 564                                 devname, mpp->alias);
 565                 }
 566         }
 567
 568 out:
 569         if ((i = find_slot(vecs->pathvec, (void *)pp)) != -1)
 570                 vector_del_slot(vecs->pathvec, i);
 571
 572         free_path(pp);
 573
 574         return retval;
 575
 576 fail:
 577         remove_map_and_stop_waiter(mpp, vecs, 1);
 578         return 1;
 579 }
 580
 581 static int
 582 map_discovery (struct vectors * vecs)
 583 {
 584         struct multipath * mpp;
 585         unsigned int i;
 586
 587         if (dm_get_maps(vecs->mpvec))
 588                 return 1;
 589
 590         vector_foreach_slot (vecs->mpvec, mpp, i)
 591                 if (setup_multipath(vecs, mpp))
 592                         return 1;
 593
 594         return 0;
 595 }
 596
 597 int
 598 uxsock_trigger (char * str, char ** reply, int * len, void * trigger_data)
 599 {
 600         struct vectors * vecs;
 601         int r;
 602
 603         *reply = NULL;
 604         *len = 0;
 605         vecs = (struct vectors *)trigger_data;
 606
 607         pthread_cleanup_push(cleanup_lock, &vecs->lock);
 608         lock(vecs->lock);
 609
 610         r = parse_cmd(str, reply, len, vecs);
 611
 612         if (r > 0) {
 613                 *reply = STRDUP("fail\n");
 614                 *len = strlen(*reply) + 1;
 615                 r = 1;
 616         }
 617         else if (!r && *len == 0) {
 618                 *reply = STRDUP("ok\n");
 619                 *len = strlen(*reply) + 1;
 620                 r = 0;
 621         }
 622         /* else if (r < 0) leave *reply alone */
 623
 624         lock_cleanup_pop(vecs->lock);
 625         return r;
 626 }
 627
 628 static int
 629 uev_discard(char * devpath)
 630 {
 631         char *tmp;
 632         char a[11], b[11];
 633
 634         /*
 635          * keep only block devices, discard partitions
 636          */
 637         tmp = strstr(devpath, "/block/");
 638         if (tmp == NULL){
 639                 condlog(4, "no /block/ in '%s'", devpath);
 640                 return 1;
 641         }
 642         if (sscanf(tmp, "/block/%10s", a) != 1 ||
 643             sscanf(tmp, "/block/%10[^/]/%10s", a, b) == 2) {
 644                 condlog(4, "discard event on %s", devpath);
 645                 return 1;
 646         }
 647         return 0;
 648 }
 649
 650 int
 651 uev_trigger (struct uevent * uev, void * trigger_data)
 652 {
 653         int r = 0;
 654         struct sysfs_device *sysdev;
 655         struct vectors * vecs;
 656
 657         vecs = (struct vectors *)trigger_data;
 658
 659         if (uev_discard(uev->devpath))
 660                 return 0;
 661
 662         sysdev = sysfs_device_get(uev->devpath);
 663         if(!sysdev)
 664                 return 0;
 665
 666         lock(vecs->lock);
 667
 668         /*
 669          * device map event
 670          * Add events are ignored here as the tables
 671          * are not fully initialised then.
 672          */
 673         if (!strncmp(sysdev->kernel, "dm-", 3)) {
 674                 if (!strncmp(uev->action, "change", 6)) {
 675                         r = uev_add_map(sysdev, vecs);
 676                         goto out;
 677                 }
 678                 if (!strncmp(uev->action, "remove", 6)) {
 679                         r = uev_remove_map(sysdev, vecs);
 680                         goto out;
 681                 }
 682                 if (!strncmp(uev->action, "umount", 6)) {
 683                         r = uev_umount_map(sysdev, vecs);
 684                         goto out;
 685                 }
 686                 goto out;
 687         }
 688
 689         /*
 690          * path add/remove event
 691          */
 692         if (filter_devnode(conf->blist_devnode, conf->elist_devnode,
 693                            sysdev->kernel) > 0)
 694                 goto out;
 695
 696         if (!strncmp(uev->action, "add", 3)) {
 697                 r = uev_add_path(sysdev, vecs);
 698                 goto out;
 699         }
 700         if (!strncmp(uev->action, "remove", 6)) {
 701                 r = uev_remove_path(sysdev, vecs);
 702                 goto out;
 703         }
 704
 705 out:
 706         unlock(vecs->lock);
 707         return r;
 708 }
 709
 710 static void *
 711 ueventloop (void * ap)
 712 {
 713         block_signal(SIGUSR1, NULL);
 714         block_signal(SIGHUP, NULL);
 715
 716         if (uevent_listen(&uev_trigger, ap))
 717                 fprintf(stderr, "error starting uevent listener");
 718
 719         return NULL;
 720 }
 721
 722 static void *
 723 uxlsnrloop (void * ap)
 724 {
 725         block_signal(SIGUSR1, NULL);
 726         block_signal(SIGHUP, NULL);
 727
 728         if (cli_init())
 729                 return NULL;
 730
 731         set_handler_callback(LIST+PATHS, cli_list_paths);
 732         set_handler_callback(LIST+PATHS+FMT, cli_list_paths_fmt);
 733         set_handler_callback(LIST+MAPS, cli_list_maps);
 734         set_handler_callback(LIST+STATUS, cli_list_status);
 735         set_handler_callback(LIST+MAPS+STATUS, cli_list_maps_status);
 736         set_handler_callback(LIST+MAPS+STATS, cli_list_maps_stats);
 737         set_handler_callback(LIST+MAPS+FMT, cli_list_maps_fmt);
 738         set_handler_callback(LIST+MAPS+TOPOLOGY, cli_list_maps_topology);
 739         set_handler_callback(LIST+TOPOLOGY, cli_list_maps_topology);
 740         set_handler_callback(LIST+MAP+TOPOLOGY, cli_list_map_topology);
 741         set_handler_callback(LIST+CONFIG, cli_list_config);
 742         set_handler_callback(LIST+BLACKLIST, cli_list_blacklist);
 743         set_handler_callback(LIST+DEVICES, cli_list_devices);
 744         set_handler_callback(LIST+WILDCARDS, cli_list_wildcards);
 745         set_handler_callback(ADD+PATH, cli_add_path);
 746         set_handler_callback(DEL+PATH, cli_del_path);
 747         set_handler_callback(ADD+MAP, cli_add_map);
 748         set_handler_callback(DEL+MAP, cli_del_map);
 749         set_handler_callback(SWITCH+MAP+GROUP, cli_switch_group);
 750         set_handler_callback(RECONFIGURE, cli_reconfigure);
 751         set_handler_callback(SUSPEND+MAP, cli_suspend);
 752         set_handler_callback(RESUME+MAP, cli_resume);
 753         set_handler_callback(RESIZE+MAP, cli_resize);
 754         set_handler_callback(REINSTATE+PATH, cli_reinstate);
 755         set_handler_callback(FAIL+PATH, cli_fail);
 756         set_handler_callback(DISABLEQ+MAP, cli_disable_queueing);
 757         set_handler_callback(RESTOREQ+MAP, cli_restore_queueing);
 758         set_handler_callback(DISABLEQ+MAPS, cli_disable_all_queueing);
 759         set_handler_callback(RESTOREQ+MAPS, cli_restore_all_queueing);
 760         set_handler_callback(QUIT, cli_quit);
 761
 762         umask(077);
 763         uxsock_listen(&uxsock_trigger, ap);
 764
 765         return NULL;
 766 }
 767
 768 static int
 769 exit_daemon (int status)
 770 {
 771         if (status != 0)
 772                 fprintf(stderr, "bad exit status. see daemon.log\n");
 773
 774         condlog(3, "unlink pidfile");
 775         unlink(DEFAULT_PIDFILE);
 776
 777         pthread_mutex_lock(&exit_mutex);
 778         pthread_cond_signal(&exit_cond);
 779         pthread_mutex_unlock(&exit_mutex);
 780
 781         return status;
 782 }
 783
 784 static void
 785 fail_path (struct path * pp, int del_active)
 786 {
 787         if (!pp->mpp)
 788                 return;
 789
 790         condlog(2, "checker failed path %s in map %s",
 791                  pp->dev_t, pp->mpp->alias);
 792
 793         dm_fail_path(pp->mpp->alias, pp->dev_t);
 794         if (del_active)
 795                 update_queue_mode_del_path(pp->mpp);
 796 }
 797
 798 /*
 799  * caller must have locked the path list before calling that function
 800  */
 801 static void
 802 reinstate_path (struct path * pp, int add_active)
 803 {
 804         if (!pp->mpp)
 805                 return;
 806
 807         if (dm_reinstate_path(pp->mpp->alias, pp->dev_t))
 808                 condlog(0, "%s: reinstate failed", pp->dev_t);
 809         else {
 810                 condlog(2, "%s: reinstated", pp->dev_t);
 811                 if (add_active)
 812                         update_queue_mode_add_path(pp->mpp);
 813         }
 814 }
 815
 816 static void
 817 enable_group(struct path * pp)
 818 {
 819         struct pathgroup * pgp;
 820
 821         /*
 822          * if path is added through uev_add_path, pgindex can be unset.
 823          * next update_strings() will set it, upon map reload event.
 824          *
 825          * we can safely return here, because upon map reload, all
 826          * PG will be enabled.
 827          */
 828         if (!pp->mpp->pg || !pp->pgindex)
 829                 return;
 830
 831         pgp = VECTOR_SLOT(pp->mpp->pg, pp->pgindex - 1);
 832
 833         if (pgp->status == PGSTATE_DISABLED) {
 834                 condlog(2, "%s: enable group #%i", pp->mpp->alias, pp->pgindex);
 835                 dm_enablegroup(pp->mpp->alias, pp->pgindex);
 836         }
 837 }
 838
 839 static void
 840 mpvec_garbage_collector (struct vectors * vecs)
 841 {
 842         struct multipath * mpp;
 843         unsigned int i;
 844
 845         if (!vecs->mpvec)
 846                 return;
 847
 848         vector_foreach_slot (vecs->mpvec, mpp, i) {
 849                 if (mpp && mpp->alias && !dm_map_present(mpp->alias)) {
 850                         condlog(2, "%s: remove dead map", mpp->alias);
 851                         remove_map_and_stop_waiter(mpp, vecs, 1);
 852                         i--;
 853                 }
 854         }
 855 }
 856
 857 static void
 858 defered_failback_tick (vector mpvec)
 859 {
 860         struct multipath * mpp;
 861         unsigned int i;
 862
 863         vector_foreach_slot (mpvec, mpp, i) {
 864                 /*
 865                  * defered failback getting sooner
 866                  */
 867                 if (mpp->pgfailback > 0 && mpp->failback_tick > 0) {
 868                         mpp->failback_tick--;
 869
 870                         if (!mpp->failback_tick && need_switch_pathgroup(mpp, 1))
 871                                 switch_pathgroup(mpp);
 872                 }
 873         }
 874 }
 875
 876 static void
 877 retry_count_tick(vector mpvec)
 878 {
 879         struct multipath *mpp;
 880         unsigned int i;
 881
 882         vector_foreach_slot (mpvec, mpp, i) {
 883                 if (mpp->retry_tick) {
 884                         mpp->stat_total_queueing_time++;
 885                         condlog(4, "%s: Retrying.. No active path", mpp->alias);
 886                         if(--mpp->retry_tick == 0) {
 887                                 dm_queue_if_no_path(mpp->alias, 0);
 888                                 condlog(2, "%s: Disable queueing", mpp->alias);
 889                         }
 890                 }
 891         }
 892 }
 893
 894 void
 895 check_path (struct vectors * vecs, struct path * pp)
 896 {
 897         int newstate;
 898
 899         if (!pp->mpp)
 900                 return;
 901
 902         if (pp->tick && --pp->tick)
 903                 return; /* don't check this path yet */
 904
 905         /*
 906          * provision a next check soonest,
 907          * in case we exit abnormaly from here
 908          */
 909         pp->tick = conf->checkint;
 910
 911         if (!checker_selected(&pp->checker)) {
 912                 pathinfo(pp, conf->hwtable, DI_SYSFS);
 913                 select_checker(pp);
 914         }
 915         if (!checker_selected(&pp->checker)) {
 916                 condlog(0, "%s: checker is not set", pp->dev);
 917                 return;
 918         }
 919         /*
 920          * Set checker in async mode.
 921          * Honored only by checker implementing the said mode.
 922          */
 923         checker_set_async(&pp->checker);
 924
 925         if (path_offline(pp))
 926                 newstate = PATH_DOWN;
 927         else
 928                 newstate = checker_check(&pp->checker);
 929
 930         if (newstate < 0) {
 931                 condlog(2, "%s: unusable path", pp->dev);
 932                 pathinfo(pp, conf->hwtable, 0);
 933                 return;
 934         }
 935         /*
 936          * Async IO in flight. Keep the previous path state
 937          * and reschedule as soon as possible
 938          */
 939         if (newstate == PATH_PENDING) {
 940                 pp->tick = 1;
 941                 return;
 942         }
 943         if (newstate != pp->state) {
 944                 int oldstate = pp->state;
 945                 pp->state = newstate;
 946                 LOG_MSG(1, checker_message(&pp->checker));
 947
 948                 /*
 949                  * upon state change, reset the checkint
 950                  * to the shortest delay
 951                  */
 952                 pp->checkint = conf->checkint;
 953
 954                 if (newstate == PATH_DOWN || newstate == PATH_SHAKY ||
 955                     update_multipath_strings(pp->mpp, vecs->pathvec)) {
 956                         /*
 957                          * proactively fail path in the DM
 958                          */
 959                         if (oldstate == PATH_UP ||
 960                             oldstate == PATH_GHOST)
 961                                 fail_path(pp, 1);
 962                         else
 963                                 fail_path(pp, 0);
 964
 965                         /*
 966                          * cancel scheduled failback
 967                          */
 968                         pp->mpp->failback_tick = 0;
 969
 970                         pp->mpp->stat_path_failures++;
 971                         return;
 972                 }
 973
 974                 /*
 975                  * reinstate this path
 976                  */
 977                 if (oldstate != PATH_UP &&
 978                     oldstate != PATH_GHOST)
 979                         reinstate_path(pp, 1);
 980                 else
 981                         reinstate_path(pp, 0);
 982
 983                 /*
 984                  * schedule [defered] failback
 985                  */
 986                 if (pp->mpp->pgfailback > 0)
 987                         pp->mpp->failback_tick =
 988                                 pp->mpp->pgfailback + 1;
 989                 else if (pp->mpp->pgfailback == -FAILBACK_IMMEDIATE &&
 990                     need_switch_pathgroup(pp->mpp, 1))
 991                         switch_pathgroup(pp->mpp);
 992
 993                 /*
 994                  * if at least one path is up in a group, and
 995                  * the group is disabled, re-enable it
 996                  */
 997                 if (newstate == PATH_UP)
 998                         enable_group(pp);
 999         }
1000         else if (newstate == PATH_UP || newstate == PATH_GHOST) {
1001                 LOG_MSG(4, checker_message(&pp->checker));
1002                 /*
1003                  * double the next check delay.
1004                  * max at conf->max_checkint
1005                  */
1006                 if (pp->checkint < (conf->max_checkint / 2))
1007                         pp->checkint = 2 * pp->checkint;
1008                 else
1009                         pp->checkint = conf->max_checkint;
1010
1011                 pp->tick = pp->checkint;
1012                 condlog(4, "%s: delay next check %is",
1013                                 pp->dev_t, pp->tick);
1014         }
1015         else if (newstate == PATH_DOWN)
1016                 LOG_MSG(2, checker_message(&pp->checker));
1017
1018         pp->state = newstate;
1019
1020         /*
1021          * path prio refreshing
1022          */
1023         condlog(4, "path prio refresh");
1024         pathinfo(pp, conf->hwtable, DI_PRIO);
1025
1026         /*
1027          * pathgroup failback policy
1028          */
1029         if (need_switch_pathgroup(pp->mpp, 0)) {
1030                 if (pp->mpp->pgfailback > 0 &&
1031                     pp->mpp->failback_tick <= 0)
1032                         pp->mpp->failback_tick =
1033                                 pp->mpp->pgfailback + 1;
1034                 else if (pp->mpp->pgfailback ==
1035                                 -FAILBACK_IMMEDIATE)
1036                         switch_pathgroup(pp->mpp);
1037         }
1038 }
1039
1040 static void *
1041 checkerloop (void *ap)
1042 {
1043         struct vectors *vecs;
1044         struct path *pp;
1045         int count = 0;
1046         unsigned int i;
1047         sigset_t old;
1048
1049         mlockall(MCL_CURRENT | MCL_FUTURE);
1050         vecs = (struct vectors *)ap;
1051         condlog(2, "path checkers start up");
1052
1053         /*
1054          * init the path check interval
1055          */
1056         vector_foreach_slot (vecs->pathvec, pp, i) {
1057                 pp->checkint = conf->checkint;
1058         }
1059
1060         while (1) {
1061                 block_signal(SIGHUP, &old);
1062                 pthread_cleanup_push(cleanup_lock, &vecs->lock);
1063                 lock(vecs->lock);
1064                 condlog(4, "tick");
1065
1066                 if (vecs->pathvec) {
1067                         vector_foreach_slot (vecs->pathvec, pp, i) {
1068                                 check_path(vecs, pp);
1069                         }
1070                 }
1071                 if (vecs->mpvec) {
1072                         defered_failback_tick(vecs->mpvec);
1073                         retry_count_tick(vecs->mpvec);
1074                 }
1075                 if (count)
1076                         count--;
1077                 else {
1078                         condlog(4, "map garbage collection");
1079                         mpvec_garbage_collector(vecs);
1080                         count = MAPGCINT;
1081                 }
1082
1083                 lock_cleanup_pop(vecs->lock);
1084                 pthread_sigmask(SIG_SETMASK, &old, NULL);
1085                 sleep(1);
1086         }
1087         return NULL;
1088 }
1089
1090 int
1091 configure (struct vectors * vecs, int start_waiters)
1092 {
1093         struct multipath * mpp;
1094         struct path * pp;
1095         vector mpvec;
1096         int i;
1097
1098         if (!vecs->pathvec && !(vecs->pathvec = vector_alloc()))
1099                 return 1;
1100
1101         if (!vecs->mpvec && !(vecs->mpvec = vector_alloc()))
1102                 return 1;
1103
1104         if (!(mpvec = vector_alloc()))
1105                 return 1;
1106
1107         /*
1108          * probe for current path (from sysfs) and map (from dm) sets
1109          */
1110         path_discovery(vecs->pathvec, conf, DI_ALL);
1111
1112         vector_foreach_slot (vecs->pathvec, pp, i){
1113                 if (filter_path(conf, pp) > 0){
1114                         vector_del_slot(vecs->pathvec, i);
1115                         free_path(pp);
1116                         i--;
1117                 }
1118                 else
1119                         pp->checkint = conf->checkint;
1120         }
1121         if (map_discovery(vecs))
1122                 return 1;
1123
1124         /*
1125          * create new set of maps & push changed ones into dm
1126          */
1127         if (coalesce_paths(vecs, mpvec, NULL, 0))
1128                 return 1;
1129
1130         /*
1131          * may need to remove some maps which are no longer relevant
1132          * e.g., due to blacklist changes in conf file
1133          */
1134         if (coalesce_maps(vecs, mpvec))
1135                 return 1;
1136
1137         dm_lib_release();
1138
1139         sync_maps_state(mpvec);
1140
1141         /*
1142          * purge dm of old maps
1143          */
1144         remove_maps(vecs);
1145
1146         /*
1147          * save new set of maps formed by considering current path state
1148          */
1149         vector_free(vecs->mpvec);
1150         vecs->mpvec = mpvec;
1151
1152         /*
1153          * start dm event waiter threads for these new maps
1154          */
1155         vector_foreach_slot(vecs->mpvec, mpp, i) {
1156                 if (setup_multipath(vecs, mpp))
1157                         return 1;
1158                 if (start_waiters)
1159                         if (start_waiter_thread(mpp, vecs))
1160                                 return 1;
1161         }
1162         return 0;
1163 }
1164
1165 int
1166 reconfigure (struct vectors * vecs)
1167 {
1168         struct config * old = conf;
1169
1170         /*
1171          * free old map and path vectors ... they use old conf state
1172          */
1173         if (VECTOR_SIZE(vecs->mpvec))
1174                 remove_maps_and_stop_waiters(vecs);
1175
1176         if (VECTOR_SIZE(vecs->pathvec))
1177                 free_pathvec(vecs->pathvec, FREE_PATHS);
1178
1179         vecs->pathvec = NULL;
1180         conf = NULL;
1181
1182         if (load_config(DEFAULT_CONFIGFILE))
1183                 return 1;
1184
1185         conf->verbosity = old->verbosity;
1186
1187         if (!conf->checkint) {
1188                 conf->checkint = DEFAULT_CHECKINT;
1189                 conf->max_checkint = MAX_CHECKINT(conf->checkint);
1190         }
1191         configure(vecs, 1);
1192         free_config(old);
1193         return 0;
1194 }
1195
1196 static struct vectors *
1197 init_vecs (void)
1198 {
1199         struct vectors * vecs;
1200
1201         vecs = (struct vectors *)MALLOC(sizeof(struct vectors));
1202
1203         if (!vecs)
1204                 return NULL;
1205
1206         vecs->lock.mutex =
1207                 (pthread_mutex_t *)MALLOC(sizeof(pthread_mutex_t));
1208
1209         if (!vecs->lock.mutex)
1210                 goto out;
1211
1212         pthread_mutex_init(vecs->lock.mutex, NULL);
1213         vecs->lock.depth = 0;
1214
1215         return vecs;
1216
1217 out:
1218         FREE(vecs);
1219         condlog(0, "failed to init paths");
1220         return NULL;
1221 }
1222
1223 static void *
1224 signal_set(int signo, void (*func) (int))
1225 {
1226         int r;
1227         struct sigaction sig;
1228         struct sigaction osig;
1229
1230         sig.sa_handler = func;
1231         sigemptyset(&sig.sa_mask);
1232         sig.sa_flags = 0;
1233
1234         r = sigaction(signo, &sig, &osig);
1235
1236         if (r < 0)
1237                 return (SIG_ERR);
1238         else
1239                 return (osig.sa_handler);
1240 }
1241
1242 static void
1243 sighup (int sig)
1244 {
1245         condlog(2, "reconfigure (SIGHUP)");
1246
1247         lock(gvecs->lock);
1248         reconfigure(gvecs);
1249         unlock(gvecs->lock);
1250
1251 #ifdef _DEBUG_
1252         dbg_free_final(NULL);
1253 #endif
1254 }
1255
1256 static void
1257 sigend (int sig)
1258 {
1259         exit_daemon(0);
1260 }
1261
1262 static void
1263 sigusr1 (int sig)
1264 {
1265         condlog(3, "SIGUSR1 received");
1266 }
1267
1268 static void
1269 signal_init(void)
1270 {
1271         signal_set(SIGHUP, sighup);
1272         signal_set(SIGUSR1, sigusr1);
1273         signal_set(SIGINT, sigend);
1274         signal_set(SIGTERM, sigend);
1275         signal(SIGPIPE, SIG_IGN);
1276 }
1277
1278 static void
1279 setscheduler (void)
1280 {
1281         int res;
1282         static struct sched_param sched_param = {
1283                 .sched_priority = 99
1284         };
1285
1286         res = sched_setscheduler (0, SCHED_RR, &sched_param);
1287
1288         if (res == -1)
1289                 condlog(LOG_WARNING, "Could not set SCHED_RR at priority 99");
1290         return;
1291 }
1292
1293 static void
1294 set_oom_adj (int val)
1295 {
1296         FILE *fp;
1297
1298         fp = fopen("/proc/self/oom_adj", "w");
1299
1300         if (!fp)
1301                 return;
1302
1303         fprintf(fp, "%i", val);
1304         fclose(fp);
1305 }
1306
1307 void
1308 setup_thread_attr(pthread_attr_t *attr, size_t stacksize, int detached)
1309 {
1310         if (pthread_attr_init(attr)) {
1311                 fprintf(stderr, "can't initialize thread attr: %s\n",
1312                         strerror(errno));
1313                 exit(1);
1314         }
1315         if (stacksize < PTHREAD_STACK_MIN)
1316                 stacksize = PTHREAD_STACK_MIN;
1317
1318         if (pthread_attr_setstacksize(attr, stacksize)) {
1319                 fprintf(stderr, "can't set thread stack size to %lu: %s\n",
1320                         (unsigned long)stacksize, strerror(errno));
1321                 exit(1);
1322         }
1323         if (detached && pthread_attr_setdetachstate(attr,
1324                                                     PTHREAD_CREATE_DETACHED)) {
1325                 fprintf(stderr, "can't set thread to detached: %s\n",
1326                         strerror(errno));
1327                 exit(1);
1328         }
1329 }
1330
1331 static int
1332 child (void * param)
1333 {
1334         pthread_t check_thr, uevent_thr, uxlsnr_thr;
1335         pthread_attr_t log_attr, misc_attr;
1336         struct vectors * vecs;
1337
1338         mlockall(MCL_CURRENT | MCL_FUTURE);
1339
1340         setup_thread_attr(&misc_attr, 64 * 1024, 1);
1341         setup_thread_attr(&waiter_attr, 32 * 1024, 1);
1342
1343         if (logsink) {
1344                 setup_thread_attr(&log_attr, 64 * 1024, 0);
1345                 log_thread_start(&log_attr);
1346                 pthread_attr_destroy(&log_attr);
1347         }
1348
1349         condlog(2, "--------start up--------");
1350         condlog(2, "read " DEFAULT_CONFIGFILE);
1351
1352         if (load_config(DEFAULT_CONFIGFILE))
1353                 exit(1);
1354
1355         if (init_checkers()) {
1356                 condlog(0, "failed to initialize checkers");
1357                 exit(1);
1358         }
1359         if (init_prio()) {
1360                 condlog(0, "failed to initialize prioritizers");
1361                 exit(1);
1362         }
1363
1364         setlogmask(LOG_UPTO(conf->verbosity + 3));
1365
1366         /*
1367          * fill the voids left in the config file
1368          */
1369         if (!conf->checkint) {
1370                 conf->checkint = DEFAULT_CHECKINT;
1371                 conf->max_checkint = MAX_CHECKINT(conf->checkint);
1372         }
1373
1374         if (conf->max_fds) {
1375                 struct rlimit fd_limit;
1376
1377                 fd_limit.rlim_cur = conf->max_fds;
1378                 fd_limit.rlim_max = conf->max_fds;
1379                 if (setrlimit(RLIMIT_NOFILE, &fd_limit) < 0)
1380                         condlog(0, "can't set open fds limit to %d : %s\n",
1381                                 conf->max_fds, strerror(errno));
1382         }
1383
1384         if (pidfile_create(DEFAULT_PIDFILE, getpid())) {
1385                 if (logsink)
1386                         log_thread_stop();
1387
1388                 exit(1);
1389         }
1390         signal_init();
1391         setscheduler();
1392         set_oom_adj(-16);
1393         vecs = gvecs = init_vecs();
1394
1395         if (!vecs)
1396                 exit(1);
1397
1398         if (sysfs_init(conf->sysfs_dir, FILE_NAME_SIZE)) {
1399                 condlog(0, "can not find sysfs mount point");
1400                 exit(1);
1401         }
1402         conf->daemon = 1;
1403         /*
1404          * fetch and configure both paths and multipaths
1405          */
1406         if (configure(vecs, 1)) {
1407                 condlog(0, "failure during configuration");
1408                 exit(1);
1409         }
1410         /*
1411          * start threads
1412          */
1413         pthread_create(&check_thr, &misc_attr, checkerloop, vecs);
1414         pthread_create(&uevent_thr, &misc_attr, ueventloop, vecs);
1415         pthread_create(&uxlsnr_thr, &misc_attr, uxlsnrloop, vecs);
1416         pthread_attr_destroy(&misc_attr);
1417
1418         pthread_cond_wait(&exit_cond, &exit_mutex);
1419
1420         /*
1421          * exit path
1422          */
1423         block_signal(SIGHUP, NULL);
1424         lock(vecs->lock);
1425         remove_maps_and_stop_waiters(vecs);
1426         free_pathvec(vecs->pathvec, FREE_PATHS);
1427
1428         pthread_cancel(check_thr);
1429         pthread_cancel(uevent_thr);
1430         pthread_cancel(uxlsnr_thr);
1431
1432         sysfs_cleanup();
1433
1434         free_keys(keys);
1435         keys = NULL;
1436         free_handlers(handlers);
1437         handlers = NULL;
1438         free_polls();
1439
1440         unlock(vecs->lock);
1441         /* Now all the waitevent threads will start rushing in. */
1442         while (vecs->lock.depth > 0) {
1443                 sleep (1); /* This is weak. */
1444                 condlog(3,"Have %d wait event checkers threads to de-alloc, waiting..\n", vecs->lock.depth);
1445         }
1446         pthread_mutex_destroy(vecs->lock.mutex);
1447         FREE(vecs->lock.mutex);
1448         vecs->lock.depth = 0;
1449         vecs->lock.mutex = NULL;
1450         FREE(vecs);
1451         vecs = NULL;
1452
1453         condlog(2, "--------shut down-------");
1454
1455         if (logsink)
1456                 log_thread_stop();
1457
1458         dm_lib_release();
1459         dm_lib_exit();
1460
1461         cleanup_prio();
1462         cleanup_checkers();
1463         /*
1464          * Freeing config must be done after condlog() and dm_lib_exit(),
1465          * because logging functions like dlog() and dm_write_log()
1466          * reference the config.
1467          */
1468         free_config(conf);
1469         conf = NULL;
1470
1471 #ifdef _DEBUG_
1472         dbg_free_final(NULL);
1473 #endif
1474
1475         exit(0);
1476 }
1477
1478 static int
1479 daemonize(void)
1480 {
1481         int pid;
1482         int in_fd, out_fd;
1483
1484         if( (pid = fork()) < 0){
1485                 fprintf(stderr, "Failed first fork : %s\n", strerror(errno));
1486                 return -1;
1487         }
1488         else if (pid != 0)
1489                 return pid;
1490
1491         setsid();
1492
1493         if ( (pid = fork()) < 0)
1494                 fprintf(stderr, "Failed second fork : %s\n", strerror(errno));
1495         else if (pid != 0)
1496                 _exit(0);
1497
1498         in_fd = open("/dev/null", O_RDONLY);
1499         if (in_fd < 0){
1500                 fprintf(stderr, "cannot open /dev/null for input : %s\n",
1501                         strerror(errno));
1502                 _exit(0);
1503         }
1504         out_fd = open("/dev/console", O_WRONLY);
1505         if (out_fd < 0){
1506                 fprintf(stderr, "cannot open /dev/console for output : %s\n",
1507                         strerror(errno));
1508                 _exit(0);
1509         }
1510
1511         close(STDIN_FILENO);
1512         dup(in_fd);
1513         close(STDOUT_FILENO);
1514         dup(out_fd);
1515         close(STDERR_FILENO);
1516         dup(out_fd);
1517
1518         close(in_fd);
1519         close(out_fd);
1520         if (chdir("/") < 0)
1521                 fprintf(stderr, "cannot chdir to '/', continuing\n");
1522
1523         return 0;
1524 }
1525
1526 int
1527 main (int argc, char *argv[])
1528 {
1529         extern char *optarg;
1530         extern int optind;
1531         int arg;
1532         int err;
1533
1534         logsink = 1;
1535         dm_init();
1536
1537         if (getuid() != 0) {
1538                 fprintf(stderr, "need to be root\n");
1539                 exit(1);
1540         }
1541
1542         /* make sure we don't lock any path */
1543         chdir("/");
1544         umask(umask(077) | 022);
1545
1546         conf = alloc_config();
1547
1548         if (!conf)
1549                 exit(1);
1550
1551         while ((arg = getopt(argc, argv, ":dv:k::")) != EOF ) {
1552         switch(arg) {
1553                 case 'd':
1554                         logsink = 0;
1555                         //debug=1; /* ### comment me out ### */
1556                         break;
1557                 case 'v':
1558                         if (sizeof(optarg) > sizeof(char *) ||
1559                             !isdigit(optarg[0]))
1560                                 exit(1);
1561
1562                         conf->verbosity = atoi(optarg);
1563                         break;
1564                 case 'k':
1565                         uxclnt(optarg);
1566                         exit(0);
1567                 default:
1568                         ;
1569                 }
1570         }
1571         if (optind < argc) {
1572                 char cmd[CMDSIZE];
1573                 char * s = cmd;
1574                 char * c = s;
1575
1576                 while (optind < argc) {
1577                         if (strchr(argv[optind], ' '))
1578                                 c += snprintf(c, s + CMDSIZE - c, "\"%s\" ", argv[optind]);
1579                         else
1580                                 c += snprintf(c, s + CMDSIZE - c, "%s ", argv[optind]);
1581                         optind++;
1582                 }
1583                 c += snprintf(c, s + CMDSIZE - c, "\n");
1584                 uxclnt(s);
1585                 exit(0);
1586         }
1587
1588         if (!logsink)
1589                 err = 0;
1590         else
1591                 err = daemonize();
1592
1593         if (err < 0)
1594                 /* error */
1595                 exit(1);
1596         else if (err > 0)
1597                 /* parent dies */
1598                 exit(0);
1599         else
1600                 /* child lives */
1601                 return (child(NULL));
1602 }
1603