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                 if ((!pp->size) || (mpp->size != pp->size)) {
 402                         if (!pp->size)
 403                                 condlog(0, "%s: failed to add new path %s, "
 404                                         "device size is 0",
 405                                         devname, pp->dev);
 406                         else
 407                                 condlog(0, "%s: failed to add new path %s, "
 408                                         "device size mismatch",
 409                                         devname, pp->dev);
 410                         int i = find_slot(vecs->pathvec, (void *)pp);
 411                         if (i != -1)
 412                                 vector_del_slot(vecs->pathvec, i);
 413                         free_path(pp);
 414                         return 1;
 415                 }
 416
 417                 condlog(4,"%s: adopting all paths for path %s",
 418                         mpp->alias, pp->dev);
 419                 if (adopt_paths(vecs->pathvec, mpp))
 420                         return 1; /* leave path added to pathvec */
 421
 422                 verify_paths(mpp, vecs, NULL);
 423                 mpp->flush_on_last_del = FLUSH_UNDEF;
 424                 mpp->action = ACT_RELOAD;
 425         }
 426         else {
 427                 if (!pp->size) {
 428                         condlog(0, "%s: failed to create new map,"
 429                                 " %s device size is 0 ", devname, pp->dev);
 430                         int i = find_slot(vecs->pathvec, (void *)pp);
 431                         if (i != -1)
 432                                 vector_del_slot(vecs->pathvec, i);
 433                         free_path(pp);
 434                         return 1;
 435                 }
 436
 437                 condlog(4,"%s: creating new map", pp->dev);
 438                 if ((mpp = add_map_with_path(vecs, pp, 1)))
 439                         mpp->action = ACT_CREATE;
 440                 else
 441                         return 1; /* leave path added to pathvec */
 442         }
 443
 444         /*
 445          * push the map to the device-mapper
 446          */
 447         if (setup_map(mpp)) {
 448                 condlog(0, "%s: failed to setup map for addition of new "
 449                         "path %s", mpp->alias, devname);
 450                 goto out;
 451         }
 452         /*
 453          * reload the map for the multipath mapped device
 454          */
 455         if (domap(mpp) <= 0) {
 456                 condlog(0, "%s: failed in domap for addition of new "
 457                         "path %s", mpp->alias, devname);
 458                 /*
 459                  * deal with asynchronous uevents :((
 460                  */
 461                 if (mpp->action == ACT_RELOAD) {
 462                         condlog(0, "%s: uev_add_path sleep", mpp->alias);
 463                         sleep(1);
 464                         update_mpp_paths(mpp, vecs->pathvec);
 465                         goto rescan;
 466                 }
 467                 else
 468                         goto out;
 469         }
 470         dm_lib_release();
 471
 472         /*
 473          * update our state from kernel regardless of create or reload
 474          */
 475         if (setup_multipath(vecs, mpp))
 476                 goto out;
 477
 478         sync_map_state(mpp);
 479
 480         if (mpp->action == ACT_CREATE &&
 481             start_waiter_thread(mpp, vecs))
 482                         goto out;
 483
 484         condlog(2, "%s path added to devmap %s", devname, mpp->alias);
 485         return 0;
 486
 487 out:
 488         remove_map(mpp, vecs, 1);
 489         return 1;
 490 }
 491
 492 static int
 493 uev_remove_path (struct sysfs_device * dev, struct vectors * vecs)
 494 {
 495         int retval;
 496
 497         condlog(2, "%s: remove path (uevent)", dev->kernel);
 498         retval = ev_remove_path(dev->kernel, vecs);
 499         if (!retval)
 500                 sysfs_device_put(dev);
 501
 502         return retval;
 503 }
 504
 505 int
 506 ev_remove_path (char * devname, struct vectors * vecs)
 507 {
 508         struct multipath * mpp;
 509         struct path * pp;
 510         int i, retval = 0;
 511
 512         pp = find_path_by_dev(vecs->pathvec, devname);
 513
 514         if (!pp) {
 515                 /* Not an error; path might have been purged earlier */
 516                 condlog(0, "%s: path already removed", devname);
 517                 return 0;
 518         }
 519
 520         /*
 521          * avoid referring to the map of an orphaned path
 522          */
 523         if ((mpp = pp->mpp)) {
 524                 /*
 525                  * transform the mp->pg vector of vectors of paths
 526                  * into a mp->params string to feed the device-mapper
 527                  */
 528                 if (update_mpp_paths(mpp, vecs->pathvec)) {
 529                         condlog(0, "%s: failed to update paths",
 530                                 mpp->alias);
 531                         goto fail;
 532                 }
 533                 if ((i = find_slot(mpp->paths, (void *)pp)) != -1)
 534                         vector_del_slot(mpp->paths, i);
 535
 536                 /*
 537                  * remove the map IFF removing the last path
 538                  */
 539                 if (VECTOR_SIZE(mpp->paths) == 0) {
 540                         char alias[WWID_SIZE];
 541
 542                         /*
 543                          * flush_map will fail if the device is open
 544                          */
 545                         strncpy(alias, mpp->alias, WWID_SIZE);
 546                         if (mpp->flush_on_last_del == FLUSH_ENABLED) {
 547                                 condlog(2, "%s Last path deleted, disabling queueing", mpp->alias);
 548                                 mpp->retry_tick = 0;
 549                                 mpp->no_path_retry = NO_PATH_RETRY_FAIL;
 550                                 mpp->flush_on_last_del = FLUSH_IN_PROGRESS;
 551                                 dm_queue_if_no_path(mpp->alias, 0);
 552                         }
 553                         if (!flush_map(mpp, vecs)) {
 554                                 condlog(2, "%s: removed map after"
 555                                         " removing all paths",
 556                                         alias);
 557                                 retval = 0;
 558                                 goto out;
 559                         }
 560                         /*
 561                          * Not an error, continue
 562                          */
 563                 }
 564
 565                 if (setup_map(mpp)) {
 566                         condlog(0, "%s: failed to setup map for"
 567                                 " removal of path %s", mpp->alias,
 568                                 devname);
 569                         goto fail;
 570                 }
 571                 /*
 572                  * reload the map
 573                  */
 574                 mpp->action = ACT_RELOAD;
 575                 if (domap(mpp) <= 0) {
 576                         condlog(0, "%s: failed in domap for "
 577                                 "removal of path %s",
 578                                 mpp->alias, devname);
 579                         retval = 1;
 580                 } else {
 581                         /*
 582                          * update our state from kernel
 583                          */
 584                         if (setup_multipath(vecs, mpp)) {
 585                                 goto fail;
 586                         }
 587                         sync_map_state(mpp);
 588
 589                         condlog(2, "%s: path removed from map %s",
 590                                 devname, mpp->alias);
 591                 }
 592         }
 593
 594 out:
 595         if ((i = find_slot(vecs->pathvec, (void *)pp)) != -1)
 596                 vector_del_slot(vecs->pathvec, i);
 597
 598         free_path(pp);
 599
 600         return retval;
 601
 602 fail:
 603         remove_map_and_stop_waiter(mpp, vecs, 1);
 604         return 1;
 605 }
 606
 607 static int
 608 map_discovery (struct vectors * vecs)
 609 {
 610         struct multipath * mpp;
 611         unsigned int i;
 612
 613         if (dm_get_maps(vecs->mpvec))
 614                 return 1;
 615
 616         vector_foreach_slot (vecs->mpvec, mpp, i)
 617                 if (setup_multipath(vecs, mpp))
 618                         return 1;
 619
 620         return 0;
 621 }
 622
 623 int
 624 uxsock_trigger (char * str, char ** reply, int * len, void * trigger_data)
 625 {
 626         struct vectors * vecs;
 627         int r;
 628
 629         *reply = NULL;
 630         *len = 0;
 631         vecs = (struct vectors *)trigger_data;
 632
 633         pthread_cleanup_push(cleanup_lock, &vecs->lock);
 634         lock(vecs->lock);
 635
 636         r = parse_cmd(str, reply, len, vecs);
 637
 638         if (r > 0) {
 639                 *reply = STRDUP("fail\n");
 640                 *len = strlen(*reply) + 1;
 641                 r = 1;
 642         }
 643         else if (!r && *len == 0) {
 644                 *reply = STRDUP("ok\n");
 645                 *len = strlen(*reply) + 1;
 646                 r = 0;
 647         }
 648         /* else if (r < 0) leave *reply alone */
 649
 650         lock_cleanup_pop(vecs->lock);
 651         return r;
 652 }
 653
 654 static int
 655 uev_discard(char * devpath)
 656 {
 657         char *tmp;
 658         char a[11], b[11];
 659
 660         /*
 661          * keep only block devices, discard partitions
 662          */
 663         tmp = strstr(devpath, "/block/");
 664         if (tmp == NULL){
 665                 condlog(4, "no /block/ in '%s'", devpath);
 666                 return 1;
 667         }
 668         if (sscanf(tmp, "/block/%10s", a) != 1 ||
 669             sscanf(tmp, "/block/%10[^/]/%10s", a, b) == 2) {
 670                 condlog(4, "discard event on %s", devpath);
 671                 return 1;
 672         }
 673         return 0;
 674 }
 675
 676 int
 677 uev_trigger (struct uevent * uev, void * trigger_data)
 678 {
 679         int r = 0;
 680         struct sysfs_device *sysdev;
 681         struct vectors * vecs;
 682
 683         vecs = (struct vectors *)trigger_data;
 684
 685         if (uev_discard(uev->devpath))
 686                 return 0;
 687
 688         sysdev = sysfs_device_get(uev->devpath);
 689         if(!sysdev)
 690                 return 0;
 691
 692         lock(vecs->lock);
 693
 694         /*
 695          * device map event
 696          * Add events are ignored here as the tables
 697          * are not fully initialised then.
 698          */
 699         if (!strncmp(sysdev->kernel, "dm-", 3)) {
 700                 if (!strncmp(uev->action, "change", 6)) {
 701                         r = uev_add_map(sysdev, vecs);
 702                         goto out;
 703                 }
 704                 if (!strncmp(uev->action, "remove", 6)) {
 705                         r = uev_remove_map(sysdev, vecs);
 706                         goto out;
 707                 }
 708                 if (!strncmp(uev->action, "umount", 6)) {
 709                         r = uev_umount_map(sysdev, vecs);
 710                         goto out;
 711                 }
 712                 goto out;
 713         }
 714
 715         /*
 716          * path add/remove event
 717          */
 718         if (filter_devnode(conf->blist_devnode, conf->elist_devnode,
 719                            sysdev->kernel) > 0)
 720                 goto out;
 721
 722         if (!strncmp(uev->action, "add", 3)) {
 723                 r = uev_add_path(sysdev, vecs);
 724                 goto out;
 725         }
 726         if (!strncmp(uev->action, "remove", 6)) {
 727                 r = uev_remove_path(sysdev, vecs);
 728                 goto out;
 729         }
 730
 731 out:
 732         unlock(vecs->lock);
 733         return r;
 734 }
 735
 736 static void *
 737 ueventloop (void * ap)
 738 {
 739         block_signal(SIGUSR1, NULL);
 740         block_signal(SIGHUP, NULL);
 741
 742         if (uevent_listen(&uev_trigger, ap))
 743                 fprintf(stderr, "error starting uevent listener");
 744
 745         return NULL;
 746 }
 747
 748 static void *
 749 uxlsnrloop (void * ap)
 750 {
 751         block_signal(SIGUSR1, NULL);
 752         block_signal(SIGHUP, NULL);
 753
 754         if (cli_init())
 755                 return NULL;
 756
 757         set_handler_callback(LIST+PATHS, cli_list_paths);
 758         set_handler_callback(LIST+PATHS+FMT, cli_list_paths_fmt);
 759         set_handler_callback(LIST+MAPS, cli_list_maps);
 760         set_handler_callback(LIST+STATUS, cli_list_status);
 761         set_handler_callback(LIST+MAPS+STATUS, cli_list_maps_status);
 762         set_handler_callback(LIST+MAPS+STATS, cli_list_maps_stats);
 763         set_handler_callback(LIST+MAPS+FMT, cli_list_maps_fmt);
 764         set_handler_callback(LIST+MAPS+TOPOLOGY, cli_list_maps_topology);
 765         set_handler_callback(LIST+TOPOLOGY, cli_list_maps_topology);
 766         set_handler_callback(LIST+MAP+TOPOLOGY, cli_list_map_topology);
 767         set_handler_callback(LIST+CONFIG, cli_list_config);
 768         set_handler_callback(LIST+BLACKLIST, cli_list_blacklist);
 769         set_handler_callback(LIST+DEVICES, cli_list_devices);
 770         set_handler_callback(LIST+WILDCARDS, cli_list_wildcards);
 771         set_handler_callback(ADD+PATH, cli_add_path);
 772         set_handler_callback(DEL+PATH, cli_del_path);
 773         set_handler_callback(ADD+MAP, cli_add_map);
 774         set_handler_callback(DEL+MAP, cli_del_map);
 775         set_handler_callback(SWITCH+MAP+GROUP, cli_switch_group);
 776         set_handler_callback(RECONFIGURE, cli_reconfigure);
 777         set_handler_callback(SUSPEND+MAP, cli_suspend);
 778         set_handler_callback(RESUME+MAP, cli_resume);
 779         set_handler_callback(RESIZE+MAP, cli_resize);
 780         set_handler_callback(REINSTATE+PATH, cli_reinstate);
 781         set_handler_callback(FAIL+PATH, cli_fail);
 782         set_handler_callback(DISABLEQ+MAP, cli_disable_queueing);
 783         set_handler_callback(RESTOREQ+MAP, cli_restore_queueing);
 784         set_handler_callback(DISABLEQ+MAPS, cli_disable_all_queueing);
 785         set_handler_callback(RESTOREQ+MAPS, cli_restore_all_queueing);
 786         set_handler_callback(QUIT, cli_quit);
 787
 788         umask(077);
 789         uxsock_listen(&uxsock_trigger, ap);
 790
 791         return NULL;
 792 }
 793
 794 static int
 795 exit_daemon (int status)
 796 {
 797         if (status != 0)
 798                 fprintf(stderr, "bad exit status. see daemon.log\n");
 799
 800         condlog(3, "unlink pidfile");
 801         unlink(DEFAULT_PIDFILE);
 802
 803         pthread_mutex_lock(&exit_mutex);
 804         pthread_cond_signal(&exit_cond);
 805         pthread_mutex_unlock(&exit_mutex);
 806
 807         return status;
 808 }
 809
 810 static void
 811 fail_path (struct path * pp, int del_active)
 812 {
 813         if (!pp->mpp)
 814                 return;
 815
 816         condlog(2, "checker failed path %s in map %s",
 817                  pp->dev_t, pp->mpp->alias);
 818
 819         dm_fail_path(pp->mpp->alias, pp->dev_t);
 820         if (del_active)
 821                 update_queue_mode_del_path(pp->mpp);
 822 }
 823
 824 /*
 825  * caller must have locked the path list before calling that function
 826  */
 827 static void
 828 reinstate_path (struct path * pp, int add_active)
 829 {
 830         if (!pp->mpp)
 831                 return;
 832
 833         if (dm_reinstate_path(pp->mpp->alias, pp->dev_t))
 834                 condlog(0, "%s: reinstate failed", pp->dev_t);
 835         else {
 836                 condlog(2, "%s: reinstated", pp->dev_t);
 837                 if (add_active)
 838                         update_queue_mode_add_path(pp->mpp);
 839         }
 840 }
 841
 842 static void
 843 enable_group(struct path * pp)
 844 {
 845         struct pathgroup * pgp;
 846
 847         /*
 848          * if path is added through uev_add_path, pgindex can be unset.
 849          * next update_strings() will set it, upon map reload event.
 850          *
 851          * we can safely return here, because upon map reload, all
 852          * PG will be enabled.
 853          */
 854         if (!pp->mpp->pg || !pp->pgindex)
 855                 return;
 856
 857         pgp = VECTOR_SLOT(pp->mpp->pg, pp->pgindex - 1);
 858
 859         if (pgp->status == PGSTATE_DISABLED) {
 860                 condlog(2, "%s: enable group #%i", pp->mpp->alias, pp->pgindex);
 861                 dm_enablegroup(pp->mpp->alias, pp->pgindex);
 862         }
 863 }
 864
 865 static void
 866 mpvec_garbage_collector (struct vectors * vecs)
 867 {
 868         struct multipath * mpp;
 869         unsigned int i;
 870
 871         if (!vecs->mpvec)
 872                 return;
 873
 874         vector_foreach_slot (vecs->mpvec, mpp, i) {
 875                 if (mpp && mpp->alias && !dm_map_present(mpp->alias)) {
 876                         condlog(2, "%s: remove dead map", mpp->alias);
 877                         remove_map_and_stop_waiter(mpp, vecs, 1);
 878                         i--;
 879                 }
 880         }
 881 }
 882
 883 static void
 884 defered_failback_tick (vector mpvec)
 885 {
 886         struct multipath * mpp;
 887         unsigned int i;
 888
 889         vector_foreach_slot (mpvec, mpp, i) {
 890                 /*
 891                  * defered failback getting sooner
 892                  */
 893                 if (mpp->pgfailback > 0 && mpp->failback_tick > 0) {
 894                         mpp->failback_tick--;
 895
 896                         if (!mpp->failback_tick && need_switch_pathgroup(mpp, 1))
 897                                 switch_pathgroup(mpp);
 898                 }
 899         }
 900 }
 901
 902 static void
 903 retry_count_tick(vector mpvec)
 904 {
 905         struct multipath *mpp;
 906         unsigned int i;
 907
 908         vector_foreach_slot (mpvec, mpp, i) {
 909                 if (mpp->retry_tick) {
 910                         mpp->stat_total_queueing_time++;
 911                         condlog(4, "%s: Retrying.. No active path", mpp->alias);
 912                         if(--mpp->retry_tick == 0) {
 913                                 dm_queue_if_no_path(mpp->alias, 0);
 914                                 condlog(2, "%s: Disable queueing", mpp->alias);
 915                         }
 916                 }
 917         }
 918 }
 919
 920 void
 921 check_path (struct vectors * vecs, struct path * pp)
 922 {
 923         int newstate;
 924
 925         if (!pp->mpp)
 926                 return;
 927
 928         if (pp->tick && --pp->tick)
 929                 return; /* don't check this path yet */
 930
 931         /*
 932          * provision a next check soonest,
 933          * in case we exit abnormaly from here
 934          */
 935         pp->tick = conf->checkint;
 936
 937         if (!checker_selected(&pp->checker)) {
 938                 pathinfo(pp, conf->hwtable, DI_SYSFS);
 939                 select_checker(pp);
 940         }
 941         if (!checker_selected(&pp->checker)) {
 942                 condlog(0, "%s: checker is not set", pp->dev);
 943                 return;
 944         }
 945         /*
 946          * Set checker in async mode.
 947          * Honored only by checker implementing the said mode.
 948          */
 949         checker_set_async(&pp->checker);
 950
 951         newstate = path_offline(pp);
 952         if (newstate == PATH_UP)
 953                 newstate = checker_check(&pp->checker);
 954
 955         if (newstate < 0) {
 956                 condlog(2, "%s: unusable path", pp->dev);
 957                 pathinfo(pp, conf->hwtable, 0);
 958                 return;
 959         }
 960         /*
 961          * Async IO in flight. Keep the previous path state
 962          * and reschedule as soon as possible
 963          */
 964         if (newstate == PATH_PENDING) {
 965                 pp->tick = 1;
 966                 return;
 967         }
 968         if (newstate != pp->state) {
 969                 int oldstate = pp->state;
 970                 pp->state = newstate;
 971                 LOG_MSG(1, checker_message(&pp->checker));
 972
 973                 /*
 974                  * upon state change, reset the checkint
 975                  * to the shortest delay
 976                  */
 977                 pp->checkint = conf->checkint;
 978
 979                 if (newstate == PATH_DOWN || newstate == PATH_SHAKY ||
 980                     update_multipath_strings(pp->mpp, vecs->pathvec)) {
 981                         /*
 982                          * proactively fail path in the DM
 983                          */
 984                         if (oldstate == PATH_UP ||
 985                             oldstate == PATH_GHOST)
 986                                 fail_path(pp, 1);
 987                         else
 988                                 fail_path(pp, 0);
 989
 990                         /*
 991                          * cancel scheduled failback
 992                          */
 993                         pp->mpp->failback_tick = 0;
 994
 995                         pp->mpp->stat_path_failures++;
 996                         return;
 997                 }
 998
 999                 /*
1000                  * reinstate this path
1001                  */
1002                 if (oldstate != PATH_UP &&
1003                     oldstate != PATH_GHOST)
1004                         reinstate_path(pp, 1);
1005                 else
1006                         reinstate_path(pp, 0);
1007
1008                 /*
1009                  * schedule [defered] failback
1010                  */
1011                 if (pp->mpp->pgfailback > 0)
1012                         pp->mpp->failback_tick =
1013                                 pp->mpp->pgfailback + 1;
1014                 else if (pp->mpp->pgfailback == -FAILBACK_IMMEDIATE &&
1015                     need_switch_pathgroup(pp->mpp, 1))
1016                         switch_pathgroup(pp->mpp);
1017
1018                 /*
1019                  * if at least one path is up in a group, and
1020                  * the group is disabled, re-enable it
1021                  */
1022                 if (newstate == PATH_UP)
1023                         enable_group(pp);
1024         }
1025         else if (newstate == PATH_UP || newstate == PATH_GHOST) {
1026                 LOG_MSG(4, checker_message(&pp->checker));
1027                 /*
1028                  * double the next check delay.
1029                  * max at conf->max_checkint
1030                  */
1031                 if (pp->checkint < (conf->max_checkint / 2))
1032                         pp->checkint = 2 * pp->checkint;
1033                 else
1034                         pp->checkint = conf->max_checkint;
1035
1036                 pp->tick = pp->checkint;
1037                 condlog(4, "%s: delay next check %is",
1038                                 pp->dev_t, pp->tick);
1039         }
1040         else if (newstate == PATH_DOWN)
1041                 LOG_MSG(2, checker_message(&pp->checker));
1042
1043         pp->state = newstate;
1044
1045         /*
1046          * path prio refreshing
1047          */
1048         condlog(4, "path prio refresh");
1049         pathinfo(pp, conf->hwtable, DI_PRIO);
1050
1051         /*
1052          * pathgroup failback policy
1053          */
1054         if (need_switch_pathgroup(pp->mpp, 0)) {
1055                 if (pp->mpp->pgfailback > 0 &&
1056                     pp->mpp->failback_tick <= 0)
1057                         pp->mpp->failback_tick =
1058                                 pp->mpp->pgfailback + 1;
1059                 else if (pp->mpp->pgfailback ==
1060                                 -FAILBACK_IMMEDIATE)
1061                         switch_pathgroup(pp->mpp);
1062         }
1063 }
1064
1065 static void *
1066 checkerloop (void *ap)
1067 {
1068         struct vectors *vecs;
1069         struct path *pp;
1070         int count = 0;
1071         unsigned int i;
1072         sigset_t old;
1073
1074         mlockall(MCL_CURRENT | MCL_FUTURE);
1075         vecs = (struct vectors *)ap;
1076         condlog(2, "path checkers start up");
1077
1078         /*
1079          * init the path check interval
1080          */
1081         vector_foreach_slot (vecs->pathvec, pp, i) {
1082                 pp->checkint = conf->checkint;
1083         }
1084
1085         while (1) {
1086                 block_signal(SIGHUP, &old);
1087                 pthread_cleanup_push(cleanup_lock, &vecs->lock);
1088                 lock(vecs->lock);
1089                 condlog(4, "tick");
1090
1091                 if (vecs->pathvec) {
1092                         vector_foreach_slot (vecs->pathvec, pp, i) {
1093                                 check_path(vecs, pp);
1094                         }
1095                 }
1096                 if (vecs->mpvec) {
1097                         defered_failback_tick(vecs->mpvec);
1098                         retry_count_tick(vecs->mpvec);
1099                 }
1100                 if (count)
1101                         count--;
1102                 else {
1103                         condlog(4, "map garbage collection");
1104                         mpvec_garbage_collector(vecs);
1105                         count = MAPGCINT;
1106                 }
1107
1108                 lock_cleanup_pop(vecs->lock);
1109                 pthread_sigmask(SIG_SETMASK, &old, NULL);
1110                 sleep(1);
1111         }
1112         return NULL;
1113 }
1114
1115 int
1116 configure (struct vectors * vecs, int start_waiters)
1117 {
1118         struct multipath * mpp;
1119         struct path * pp;
1120         vector mpvec;
1121         int i;
1122
1123         if (!vecs->pathvec && !(vecs->pathvec = vector_alloc()))
1124                 return 1;
1125
1126         if (!vecs->mpvec && !(vecs->mpvec = vector_alloc()))
1127                 return 1;
1128
1129         if (!(mpvec = vector_alloc()))
1130                 return 1;
1131
1132         /*
1133          * probe for current path (from sysfs) and map (from dm) sets
1134          */
1135         path_discovery(vecs->pathvec, conf, DI_ALL);
1136
1137         vector_foreach_slot (vecs->pathvec, pp, i){
1138                 if (filter_path(conf, pp) > 0){
1139                         vector_del_slot(vecs->pathvec, i);
1140                         free_path(pp);
1141                         i--;
1142                 }
1143                 else
1144                         pp->checkint = conf->checkint;
1145         }
1146         if (map_discovery(vecs))
1147                 return 1;
1148
1149         /*
1150          * create new set of maps & push changed ones into dm
1151          */
1152         if (coalesce_paths(vecs, mpvec, NULL, 0))
1153                 return 1;
1154
1155         /*
1156          * may need to remove some maps which are no longer relevant
1157          * e.g., due to blacklist changes in conf file
1158          */
1159         if (coalesce_maps(vecs, mpvec))
1160                 return 1;
1161
1162         dm_lib_release();
1163
1164         sync_maps_state(mpvec);
1165
1166         /*
1167          * purge dm of old maps
1168          */
1169         remove_maps(vecs);
1170
1171         /*
1172          * save new set of maps formed by considering current path state
1173          */
1174         vector_free(vecs->mpvec);
1175         vecs->mpvec = mpvec;
1176
1177         /*
1178          * start dm event waiter threads for these new maps
1179          */
1180         vector_foreach_slot(vecs->mpvec, mpp, i) {
1181                 if (setup_multipath(vecs, mpp))
1182                         return 1;
1183                 if (start_waiters)
1184                         if (start_waiter_thread(mpp, vecs))
1185                                 return 1;
1186         }
1187         return 0;
1188 }
1189
1190 int
1191 reconfigure (struct vectors * vecs)
1192 {
1193         struct config * old = conf;
1194
1195         /*
1196          * free old map and path vectors ... they use old conf state
1197          */
1198         if (VECTOR_SIZE(vecs->mpvec))
1199                 remove_maps_and_stop_waiters(vecs);
1200
1201         if (VECTOR_SIZE(vecs->pathvec))
1202                 free_pathvec(vecs->pathvec, FREE_PATHS);
1203
1204         vecs->pathvec = NULL;
1205         conf = NULL;
1206
1207         if (load_config(DEFAULT_CONFIGFILE))
1208                 return 1;
1209
1210         conf->verbosity = old->verbosity;
1211
1212         if (!conf->checkint) {
1213                 conf->checkint = DEFAULT_CHECKINT;
1214                 conf->max_checkint = MAX_CHECKINT(conf->checkint);
1215         }
1216         configure(vecs, 1);
1217         free_config(old);
1218         return 0;
1219 }
1220
1221 static struct vectors *
1222 init_vecs (void)
1223 {
1224         struct vectors * vecs;
1225
1226         vecs = (struct vectors *)MALLOC(sizeof(struct vectors));
1227
1228         if (!vecs)
1229                 return NULL;
1230
1231         vecs->lock.mutex =
1232                 (pthread_mutex_t *)MALLOC(sizeof(pthread_mutex_t));
1233
1234         if (!vecs->lock.mutex)
1235                 goto out;
1236
1237         pthread_mutex_init(vecs->lock.mutex, NULL);
1238         vecs->lock.depth = 0;
1239
1240         return vecs;
1241
1242 out:
1243         FREE(vecs);
1244         condlog(0, "failed to init paths");
1245         return NULL;
1246 }
1247
1248 static void *
1249 signal_set(int signo, void (*func) (int))
1250 {
1251         int r;
1252         struct sigaction sig;
1253         struct sigaction osig;
1254
1255         sig.sa_handler = func;
1256         sigemptyset(&sig.sa_mask);
1257         sig.sa_flags = 0;
1258
1259         r = sigaction(signo, &sig, &osig);
1260
1261         if (r < 0)
1262                 return (SIG_ERR);
1263         else
1264                 return (osig.sa_handler);
1265 }
1266
1267 static void
1268 sighup (int sig)
1269 {
1270         condlog(2, "reconfigure (SIGHUP)");
1271
1272         lock(gvecs->lock);
1273         reconfigure(gvecs);
1274         unlock(gvecs->lock);
1275
1276 #ifdef _DEBUG_
1277         dbg_free_final(NULL);
1278 #endif
1279 }
1280
1281 static void
1282 sigend (int sig)
1283 {
1284         exit_daemon(0);
1285 }
1286
1287 static void
1288 sigusr1 (int sig)
1289 {
1290         condlog(3, "SIGUSR1 received");
1291 }
1292
1293 static void
1294 signal_init(void)
1295 {
1296         signal_set(SIGHUP, sighup);
1297         signal_set(SIGUSR1, sigusr1);
1298         signal_set(SIGINT, sigend);
1299         signal_set(SIGTERM, sigend);
1300         signal(SIGPIPE, SIG_IGN);
1301 }
1302
1303 static void
1304 setscheduler (void)
1305 {
1306         int res;
1307         static struct sched_param sched_param = {
1308                 .sched_priority = 99
1309         };
1310
1311         res = sched_setscheduler (0, SCHED_RR, &sched_param);
1312
1313         if (res == -1)
1314                 condlog(LOG_WARNING, "Could not set SCHED_RR at priority 99");
1315         return;
1316 }
1317
1318 static void
1319 set_oom_adj (int val)
1320 {
1321         FILE *fp;
1322
1323         fp = fopen("/proc/self/oom_adj", "w");
1324
1325         if (!fp)
1326                 return;
1327
1328         fprintf(fp, "%i", val);
1329         fclose(fp);
1330 }
1331
1332 void
1333 setup_thread_attr(pthread_attr_t *attr, size_t stacksize, int detached)
1334 {
1335         if (pthread_attr_init(attr)) {
1336                 fprintf(stderr, "can't initialize thread attr: %s\n",
1337                         strerror(errno));
1338                 exit(1);
1339         }
1340         if (stacksize < PTHREAD_STACK_MIN)
1341                 stacksize = PTHREAD_STACK_MIN;
1342
1343         if (pthread_attr_setstacksize(attr, stacksize)) {
1344                 fprintf(stderr, "can't set thread stack size to %lu: %s\n",
1345                         (unsigned long)stacksize, strerror(errno));
1346                 exit(1);
1347         }
1348         if (detached && pthread_attr_setdetachstate(attr,
1349                                                     PTHREAD_CREATE_DETACHED)) {
1350                 fprintf(stderr, "can't set thread to detached: %s\n",
1351                         strerror(errno));
1352                 exit(1);
1353         }
1354 }
1355
1356 static int
1357 child (void * param)
1358 {
1359         pthread_t check_thr, uevent_thr, uxlsnr_thr;
1360         pthread_attr_t log_attr, misc_attr;
1361         struct vectors * vecs;
1362
1363         mlockall(MCL_CURRENT | MCL_FUTURE);
1364
1365         setup_thread_attr(&misc_attr, 64 * 1024, 1);
1366         setup_thread_attr(&waiter_attr, 32 * 1024, 1);
1367
1368         if (logsink) {
1369                 setup_thread_attr(&log_attr, 64 * 1024, 0);
1370                 log_thread_start(&log_attr);
1371                 pthread_attr_destroy(&log_attr);
1372         }
1373
1374         condlog(2, "--------start up--------");
1375         condlog(2, "read " DEFAULT_CONFIGFILE);
1376
1377         if (load_config(DEFAULT_CONFIGFILE))
1378                 exit(1);
1379
1380         if (init_checkers()) {
1381                 condlog(0, "failed to initialize checkers");
1382                 exit(1);
1383         }
1384         if (init_prio()) {
1385                 condlog(0, "failed to initialize prioritizers");
1386                 exit(1);
1387         }
1388
1389         setlogmask(LOG_UPTO(conf->verbosity + 3));
1390
1391         /*
1392          * fill the voids left in the config file
1393          */
1394         if (!conf->checkint) {
1395                 conf->checkint = DEFAULT_CHECKINT;
1396                 conf->max_checkint = MAX_CHECKINT(conf->checkint);
1397         }
1398
1399         if (conf->max_fds) {
1400                 struct rlimit fd_limit;
1401
1402                 fd_limit.rlim_cur = conf->max_fds;
1403                 fd_limit.rlim_max = conf->max_fds;
1404                 if (setrlimit(RLIMIT_NOFILE, &fd_limit) < 0)
1405                         condlog(0, "can't set open fds limit to %d : %s\n",
1406                                 conf->max_fds, strerror(errno));
1407         }
1408
1409         if (pidfile_create(DEFAULT_PIDFILE, getpid())) {
1410                 if (logsink)
1411                         log_thread_stop();
1412
1413                 exit(1);
1414         }
1415         signal_init();
1416         setscheduler();
1417         set_oom_adj(-16);
1418         vecs = gvecs = init_vecs();
1419
1420         if (!vecs)
1421                 exit(1);
1422
1423         if (sysfs_init(conf->sysfs_dir, FILE_NAME_SIZE)) {
1424                 condlog(0, "can not find sysfs mount point");
1425                 exit(1);
1426         }
1427         conf->daemon = 1;
1428         /*
1429          * fetch and configure both paths and multipaths
1430          */
1431         if (configure(vecs, 1)) {
1432                 condlog(0, "failure during configuration");
1433                 exit(1);
1434         }
1435         /*
1436          * start threads
1437          */
1438         pthread_create(&check_thr, &misc_attr, checkerloop, vecs);
1439         pthread_create(&uevent_thr, &misc_attr, ueventloop, vecs);
1440         pthread_create(&uxlsnr_thr, &misc_attr, uxlsnrloop, vecs);
1441         pthread_attr_destroy(&misc_attr);
1442
1443         pthread_mutex_lock(&exit_mutex);
1444         pthread_cond_wait(&exit_cond, &exit_mutex);
1445
1446         /*
1447          * exit path
1448          */
1449         block_signal(SIGHUP, NULL);
1450         lock(vecs->lock);
1451         remove_maps_and_stop_waiters(vecs);
1452         free_pathvec(vecs->pathvec, FREE_PATHS);
1453
1454         pthread_cancel(check_thr);
1455         pthread_cancel(uevent_thr);
1456         pthread_cancel(uxlsnr_thr);
1457
1458         sysfs_cleanup();
1459
1460         free_keys(keys);
1461         keys = NULL;
1462         free_handlers(handlers);
1463         handlers = NULL;
1464         free_polls();
1465
1466         unlock(vecs->lock);
1467         /* Now all the waitevent threads will start rushing in. */
1468         while (vecs->lock.depth > 0) {
1469                 sleep (1); /* This is weak. */
1470                 condlog(3,"Have %d wait event checkers threads to de-alloc, waiting..\n", vecs->lock.depth);
1471         }
1472         pthread_mutex_destroy(vecs->lock.mutex);
1473         FREE(vecs->lock.mutex);
1474         vecs->lock.depth = 0;
1475         vecs->lock.mutex = NULL;
1476         FREE(vecs);
1477         vecs = NULL;
1478
1479         condlog(2, "--------shut down-------");
1480
1481         if (logsink)
1482                 log_thread_stop();
1483
1484         dm_lib_release();
1485         dm_lib_exit();
1486
1487         cleanup_prio();
1488         cleanup_checkers();
1489         /*
1490          * Freeing config must be done after condlog() and dm_lib_exit(),
1491          * because logging functions like dlog() and dm_write_log()
1492          * reference the config.
1493          */
1494         free_config(conf);
1495         conf = NULL;
1496
1497 #ifdef _DEBUG_
1498         dbg_free_final(NULL);
1499 #endif
1500
1501         exit(0);
1502 }
1503
1504 static int
1505 daemonize(void)
1506 {
1507         int pid;
1508         int in_fd, out_fd;
1509
1510         if( (pid = fork()) < 0){
1511                 fprintf(stderr, "Failed first fork : %s\n", strerror(errno));
1512                 return -1;
1513         }
1514         else if (pid != 0)
1515                 return pid;
1516
1517         setsid();
1518
1519         if ( (pid = fork()) < 0)
1520                 fprintf(stderr, "Failed second fork : %s\n", strerror(errno));
1521         else if (pid != 0)
1522                 _exit(0);
1523
1524         in_fd = open("/dev/null", O_RDONLY);
1525         if (in_fd < 0){
1526                 fprintf(stderr, "cannot open /dev/null for input : %s\n",
1527                         strerror(errno));
1528                 _exit(0);
1529         }
1530         out_fd = open("/dev/console", O_WRONLY);
1531         if (out_fd < 0){
1532                 fprintf(stderr, "cannot open /dev/console for output : %s\n",
1533                         strerror(errno));
1534                 _exit(0);
1535         }
1536
1537         close(STDIN_FILENO);
1538         dup(in_fd);
1539         close(STDOUT_FILENO);
1540         dup(out_fd);
1541         close(STDERR_FILENO);
1542         dup(out_fd);
1543
1544         close(in_fd);
1545         close(out_fd);
1546         if (chdir("/") < 0)
1547                 fprintf(stderr, "cannot chdir to '/', continuing\n");
1548
1549         return 0;
1550 }
1551
1552 int
1553 main (int argc, char *argv[])
1554 {
1555         extern char *optarg;
1556         extern int optind;
1557         int arg;
1558         int err;
1559
1560         logsink = 1;
1561         dm_init();
1562
1563         if (getuid() != 0) {
1564                 fprintf(stderr, "need to be root\n");
1565                 exit(1);
1566         }
1567
1568         /* make sure we don't lock any path */
1569         chdir("/");
1570         umask(umask(077) | 022);
1571
1572         conf = alloc_config();
1573
1574         if (!conf)
1575                 exit(1);
1576
1577         while ((arg = getopt(argc, argv, ":dv:k::")) != EOF ) {
1578         switch(arg) {
1579                 case 'd':
1580                         logsink = 0;
1581                         //debug=1; /* ### comment me out ### */
1582                         break;
1583                 case 'v':
1584                         if (sizeof(optarg) > sizeof(char *) ||
1585                             !isdigit(optarg[0]))
1586                                 exit(1);
1587
1588                         conf->verbosity = atoi(optarg);
1589                         break;
1590                 case 'k':
1591                         uxclnt(optarg);
1592                         exit(0);
1593                 default:
1594                         ;
1595                 }
1596         }
1597         if (optind < argc) {
1598                 char cmd[CMDSIZE];
1599                 char * s = cmd;
1600                 char * c = s;
1601
1602                 while (optind < argc) {
1603                         if (strchr(argv[optind], ' '))
1604                                 c += snprintf(c, s + CMDSIZE - c, "\"%s\" ", argv[optind]);
1605                         else
1606                                 c += snprintf(c, s + CMDSIZE - c, "%s ", argv[optind]);
1607                         optind++;
1608                 }
1609                 c += snprintf(c, s + CMDSIZE - c, "\n");
1610                 uxclnt(s);
1611                 exit(0);
1612         }
1613
1614         if (!logsink)
1615                 err = 0;
1616         else
1617                 err = daemonize();
1618
1619         if (err < 0)
1620                 /* error */
1621                 exit(1);
1622         else if (err > 0)
1623                 /* parent dies */
1624                 exit(0);
1625         else
1626                 /* child lives */
1627                 return (child(NULL));
1628 }
1629