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 - %s", pp->mpp->alias, 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(COUNT+PATHS, cli_count_paths);
 787         set_handler_callback(QUIT, cli_quit);
 788
 789         umask(077);
 790         uxsock_listen(&uxsock_trigger, ap);
 791
 792         return NULL;
 793 }
 794
 795 static int
 796 exit_daemon (int status)
 797 {
 798         if (status != 0)
 799                 fprintf(stderr, "bad exit status. see daemon.log\n");
 800
 801         condlog(3, "unlink pidfile");
 802         unlink(DEFAULT_PIDFILE);
 803
 804         pthread_mutex_lock(&exit_mutex);
 805         pthread_cond_signal(&exit_cond);
 806         pthread_mutex_unlock(&exit_mutex);
 807
 808         return status;
 809 }
 810
 811 static void
 812 fail_path (struct path * pp, int del_active)
 813 {
 814         if (!pp->mpp)
 815                 return;
 816
 817         condlog(2, "checker failed path %s in map %s",
 818                  pp->dev_t, pp->mpp->alias);
 819
 820         dm_fail_path(pp->mpp->alias, pp->dev_t);
 821         if (del_active)
 822                 update_queue_mode_del_path(pp->mpp);
 823 }
 824
 825 /*
 826  * caller must have locked the path list before calling that function
 827  */
 828 static void
 829 reinstate_path (struct path * pp, int add_active)
 830 {
 831         if (!pp->mpp)
 832                 return;
 833
 834         if (dm_reinstate_path(pp->mpp->alias, pp->dev_t))
 835                 condlog(0, "%s: reinstate failed", pp->dev_t);
 836         else {
 837                 condlog(2, "%s: reinstated", pp->dev_t);
 838                 if (add_active)
 839                         update_queue_mode_add_path(pp->mpp);
 840         }
 841 }
 842
 843 static void
 844 enable_group(struct path * pp)
 845 {
 846         struct pathgroup * pgp;
 847
 848         /*
 849          * if path is added through uev_add_path, pgindex can be unset.
 850          * next update_strings() will set it, upon map reload event.
 851          *
 852          * we can safely return here, because upon map reload, all
 853          * PG will be enabled.
 854          */
 855         if (!pp->mpp->pg || !pp->pgindex)
 856                 return;
 857
 858         pgp = VECTOR_SLOT(pp->mpp->pg, pp->pgindex - 1);
 859
 860         if (pgp->status == PGSTATE_DISABLED) {
 861                 condlog(2, "%s: enable group #%i", pp->mpp->alias, pp->pgindex);
 862                 dm_enablegroup(pp->mpp->alias, pp->pgindex);
 863         }
 864 }
 865
 866 static void
 867 mpvec_garbage_collector (struct vectors * vecs)
 868 {
 869         struct multipath * mpp;
 870         unsigned int i;
 871
 872         if (!vecs->mpvec)
 873                 return;
 874
 875         vector_foreach_slot (vecs->mpvec, mpp, i) {
 876                 if (mpp && mpp->alias && !dm_map_present(mpp->alias)) {
 877                         condlog(2, "%s: remove dead map", mpp->alias);
 878                         remove_map_and_stop_waiter(mpp, vecs, 1);
 879                         i--;
 880                 }
 881         }
 882 }
 883
 884 static void
 885 defered_failback_tick (vector mpvec)
 886 {
 887         struct multipath * mpp;
 888         unsigned int i;
 889
 890         vector_foreach_slot (mpvec, mpp, i) {
 891                 /*
 892                  * defered failback getting sooner
 893                  */
 894                 if (mpp->pgfailback > 0 && mpp->failback_tick > 0) {
 895                         mpp->failback_tick--;
 896
 897                         if (!mpp->failback_tick && need_switch_pathgroup(mpp, 1))
 898                                 switch_pathgroup(mpp);
 899                 }
 900         }
 901 }
 902
 903 static void
 904 retry_count_tick(vector mpvec)
 905 {
 906         struct multipath *mpp;
 907         unsigned int i;
 908
 909         vector_foreach_slot (mpvec, mpp, i) {
 910                 if (mpp->retry_tick) {
 911                         mpp->stat_total_queueing_time++;
 912                         condlog(4, "%s: Retrying.. No active path", mpp->alias);
 913                         if(--mpp->retry_tick == 0) {
 914                                 dm_queue_if_no_path(mpp->alias, 0);
 915                                 condlog(2, "%s: Disable queueing", mpp->alias);
 916                         }
 917                 }
 918         }
 919 }
 920
 921 void
 922 check_path (struct vectors * vecs, struct path * pp)
 923 {
 924         int newstate;
 925
 926         if (!pp->mpp)
 927                 return;
 928
 929         if (pp->tick && --pp->tick)
 930                 return; /* don't check this path yet */
 931
 932         /*
 933          * provision a next check soonest,
 934          * in case we exit abnormaly from here
 935          */
 936         pp->tick = conf->checkint;
 937
 938         newstate = get_state(pp, 1);
 939
 940         if (newstate == PATH_WILD || newstate == PATH_UNCHECKED) {
 941                 condlog(2, "%s: unusable path", pp->dev);
 942                 pathinfo(pp, conf->hwtable, 0);
 943                 return;
 944         }
 945         /*
 946          * Async IO in flight. Keep the previous path state
 947          * and reschedule as soon as possible
 948          */
 949         if (newstate == PATH_PENDING) {
 950                 pp->tick = 1;
 951                 return;
 952         }
 953         if (newstate != pp->state) {
 954                 int oldstate = pp->state;
 955                 pp->state = newstate;
 956                 LOG_MSG(1, checker_message(&pp->checker));
 957
 958                 /*
 959                  * upon state change, reset the checkint
 960                  * to the shortest delay
 961                  */
 962                 pp->checkint = conf->checkint;
 963
 964                 if (newstate == PATH_DOWN || newstate == PATH_SHAKY ||
 965                     update_multipath_strings(pp->mpp, vecs->pathvec)) {
 966                         /*
 967                          * proactively fail path in the DM
 968                          */
 969                         if (oldstate == PATH_UP ||
 970                             oldstate == PATH_GHOST)
 971                                 fail_path(pp, 1);
 972                         else
 973                                 fail_path(pp, 0);
 974
 975                         /*
 976                          * cancel scheduled failback
 977                          */
 978                         pp->mpp->failback_tick = 0;
 979
 980                         pp->mpp->stat_path_failures++;
 981                         return;
 982                 }
 983
 984                 /*
 985                  * reinstate this path
 986                  */
 987                 if (oldstate != PATH_UP &&
 988                     oldstate != PATH_GHOST)
 989                         reinstate_path(pp, 1);
 990                 else
 991                         reinstate_path(pp, 0);
 992
 993                 /*
 994                  * schedule [defered] failback
 995                  */
 996                 if (pp->mpp->pgfailback > 0)
 997                         pp->mpp->failback_tick =
 998                                 pp->mpp->pgfailback + 1;
 999                 else if (pp->mpp->pgfailback == -FAILBACK_IMMEDIATE &&
1000                     need_switch_pathgroup(pp->mpp, 1))
1001                         switch_pathgroup(pp->mpp);
1002
1003                 /*
1004                  * if at least one path is up in a group, and
1005                  * the group is disabled, re-enable it
1006                  */
1007                 if (newstate == PATH_UP)
1008                         enable_group(pp);
1009         }
1010         else if (newstate == PATH_UP || newstate == PATH_GHOST) {
1011                 LOG_MSG(4, checker_message(&pp->checker));
1012                 /*
1013                  * double the next check delay.
1014                  * max at conf->max_checkint
1015                  */
1016                 if (pp->checkint < (conf->max_checkint / 2))
1017                         pp->checkint = 2 * pp->checkint;
1018                 else
1019                         pp->checkint = conf->max_checkint;
1020
1021                 pp->tick = pp->checkint;
1022                 condlog(4, "%s: delay next check %is",
1023                                 pp->dev_t, pp->tick);
1024         }
1025         else if (newstate == PATH_DOWN)
1026                 LOG_MSG(2, checker_message(&pp->checker));
1027
1028         pp->state = newstate;
1029
1030         /*
1031          * path prio refreshing
1032          */
1033         condlog(4, "path prio refresh");
1034         pathinfo(pp, conf->hwtable, DI_PRIO);
1035
1036         /*
1037          * pathgroup failback policy
1038          */
1039         if (need_switch_pathgroup(pp->mpp, 0)) {
1040                 if (pp->mpp->pgfailback > 0 &&
1041                     pp->mpp->failback_tick <= 0)
1042                         pp->mpp->failback_tick =
1043                                 pp->mpp->pgfailback + 1;
1044                 else if (pp->mpp->pgfailback ==
1045                                 -FAILBACK_IMMEDIATE)
1046                         switch_pathgroup(pp->mpp);
1047         }
1048 }
1049
1050 static void *
1051 checkerloop (void *ap)
1052 {
1053         struct vectors *vecs;
1054         struct path *pp;
1055         int count = 0;
1056         unsigned int i;
1057         sigset_t old;
1058
1059         mlockall(MCL_CURRENT | MCL_FUTURE);
1060         vecs = (struct vectors *)ap;
1061         condlog(2, "path checkers start up");
1062
1063         /*
1064          * init the path check interval
1065          */
1066         vector_foreach_slot (vecs->pathvec, pp, i) {
1067                 pp->checkint = conf->checkint;
1068         }
1069
1070         while (1) {
1071                 block_signal(SIGHUP, &old);
1072                 pthread_cleanup_push(cleanup_lock, &vecs->lock);
1073                 lock(vecs->lock);
1074                 condlog(4, "tick");
1075
1076                 if (vecs->pathvec) {
1077                         vector_foreach_slot (vecs->pathvec, pp, i) {
1078                                 check_path(vecs, pp);
1079                         }
1080                 }
1081                 if (vecs->mpvec) {
1082                         defered_failback_tick(vecs->mpvec);
1083                         retry_count_tick(vecs->mpvec);
1084                 }
1085                 if (count)
1086                         count--;
1087                 else {
1088                         condlog(4, "map garbage collection");
1089                         mpvec_garbage_collector(vecs);
1090                         count = MAPGCINT;
1091                 }
1092
1093                 lock_cleanup_pop(vecs->lock);
1094                 pthread_sigmask(SIG_SETMASK, &old, NULL);
1095                 sleep(1);
1096         }
1097         return NULL;
1098 }
1099
1100 int
1101 configure (struct vectors * vecs, int start_waiters)
1102 {
1103         struct multipath * mpp;
1104         struct path * pp;
1105         vector mpvec;
1106         int i;
1107
1108         if (!vecs->pathvec && !(vecs->pathvec = vector_alloc()))
1109                 return 1;
1110
1111         if (!vecs->mpvec && !(vecs->mpvec = vector_alloc()))
1112                 return 1;
1113
1114         if (!(mpvec = vector_alloc()))
1115                 return 1;
1116
1117         /*
1118          * probe for current path (from sysfs) and map (from dm) sets
1119          */
1120         path_discovery(vecs->pathvec, conf, DI_ALL);
1121
1122         vector_foreach_slot (vecs->pathvec, pp, i){
1123                 if (filter_path(conf, pp) > 0){
1124                         vector_del_slot(vecs->pathvec, i);
1125                         free_path(pp);
1126                         i--;
1127                 }
1128                 else
1129                         pp->checkint = conf->checkint;
1130         }
1131         if (map_discovery(vecs))
1132                 return 1;
1133
1134         /*
1135          * create new set of maps & push changed ones into dm
1136          */
1137         if (coalesce_paths(vecs, mpvec, NULL, 0))
1138                 return 1;
1139
1140         /*
1141          * may need to remove some maps which are no longer relevant
1142          * e.g., due to blacklist changes in conf file
1143          */
1144         if (coalesce_maps(vecs, mpvec))
1145                 return 1;
1146
1147         dm_lib_release();
1148
1149         sync_maps_state(mpvec);
1150
1151         /*
1152          * purge dm of old maps
1153          */
1154         remove_maps(vecs);
1155
1156         /*
1157          * save new set of maps formed by considering current path state
1158          */
1159         vector_free(vecs->mpvec);
1160         vecs->mpvec = mpvec;
1161
1162         /*
1163          * start dm event waiter threads for these new maps
1164          */
1165         vector_foreach_slot(vecs->mpvec, mpp, i) {
1166                 if (setup_multipath(vecs, mpp))
1167                         return 1;
1168                 if (start_waiters)
1169                         if (start_waiter_thread(mpp, vecs))
1170                                 return 1;
1171         }
1172         return 0;
1173 }
1174
1175 int
1176 reconfigure (struct vectors * vecs)
1177 {
1178         struct config * old = conf;
1179
1180         /*
1181          * free old map and path vectors ... they use old conf state
1182          */
1183         if (VECTOR_SIZE(vecs->mpvec))
1184                 remove_maps_and_stop_waiters(vecs);
1185
1186         if (VECTOR_SIZE(vecs->pathvec))
1187                 free_pathvec(vecs->pathvec, FREE_PATHS);
1188
1189         vecs->pathvec = NULL;
1190         conf = NULL;
1191
1192         if (load_config(DEFAULT_CONFIGFILE))
1193                 return 1;
1194
1195         conf->verbosity = old->verbosity;
1196
1197         if (!conf->checkint) {
1198                 conf->checkint = DEFAULT_CHECKINT;
1199                 conf->max_checkint = MAX_CHECKINT(conf->checkint);
1200         }
1201         conf->daemon = 1;
1202         configure(vecs, 1);
1203         free_config(old);
1204         return 0;
1205 }
1206
1207 static struct vectors *
1208 init_vecs (void)
1209 {
1210         struct vectors * vecs;
1211
1212         vecs = (struct vectors *)MALLOC(sizeof(struct vectors));
1213
1214         if (!vecs)
1215                 return NULL;
1216
1217         vecs->lock.mutex =
1218                 (pthread_mutex_t *)MALLOC(sizeof(pthread_mutex_t));
1219
1220         if (!vecs->lock.mutex)
1221                 goto out;
1222
1223         pthread_mutex_init(vecs->lock.mutex, NULL);
1224         vecs->lock.depth = 0;
1225
1226         return vecs;
1227
1228 out:
1229         FREE(vecs);
1230         condlog(0, "failed to init paths");
1231         return NULL;
1232 }
1233
1234 static void *
1235 signal_set(int signo, void (*func) (int))
1236 {
1237         int r;
1238         struct sigaction sig;
1239         struct sigaction osig;
1240
1241         sig.sa_handler = func;
1242         sigemptyset(&sig.sa_mask);
1243         sig.sa_flags = 0;
1244
1245         r = sigaction(signo, &sig, &osig);
1246
1247         if (r < 0)
1248                 return (SIG_ERR);
1249         else
1250                 return (osig.sa_handler);
1251 }
1252
1253 static void
1254 sighup (int sig)
1255 {
1256         condlog(2, "reconfigure (SIGHUP)");
1257
1258         lock(gvecs->lock);
1259         reconfigure(gvecs);
1260         unlock(gvecs->lock);
1261
1262 #ifdef _DEBUG_
1263         dbg_free_final(NULL);
1264 #endif
1265 }
1266
1267 static void
1268 sigend (int sig)
1269 {
1270         exit_daemon(0);
1271 }
1272
1273 static void
1274 sigusr1 (int sig)
1275 {
1276         condlog(3, "SIGUSR1 received");
1277 }
1278
1279 static void
1280 signal_init(void)
1281 {
1282         signal_set(SIGHUP, sighup);
1283         signal_set(SIGUSR1, sigusr1);
1284         signal_set(SIGINT, sigend);
1285         signal_set(SIGTERM, sigend);
1286         signal(SIGPIPE, SIG_IGN);
1287 }
1288
1289 static void
1290 setscheduler (void)
1291 {
1292         int res;
1293         static struct sched_param sched_param = {
1294                 .sched_priority = 99
1295         };
1296
1297         res = sched_setscheduler (0, SCHED_RR, &sched_param);
1298
1299         if (res == -1)
1300                 condlog(LOG_WARNING, "Could not set SCHED_RR at priority 99");
1301         return;
1302 }
1303
1304 static void
1305 set_oom_adj (int val)
1306 {
1307         FILE *fp;
1308
1309         fp = fopen("/proc/self/oom_adj", "w");
1310
1311         if (!fp)
1312                 return;
1313
1314         fprintf(fp, "%i", val);
1315         fclose(fp);
1316 }
1317
1318 void
1319 setup_thread_attr(pthread_attr_t *attr, size_t stacksize, int detached)
1320 {
1321         if (pthread_attr_init(attr)) {
1322                 fprintf(stderr, "can't initialize thread attr: %s\n",
1323                         strerror(errno));
1324                 exit(1);
1325         }
1326         if (stacksize < PTHREAD_STACK_MIN)
1327                 stacksize = PTHREAD_STACK_MIN;
1328
1329         if (pthread_attr_setstacksize(attr, stacksize)) {
1330                 fprintf(stderr, "can't set thread stack size to %lu: %s\n",
1331                         (unsigned long)stacksize, strerror(errno));
1332                 exit(1);
1333         }
1334         if (detached && pthread_attr_setdetachstate(attr,
1335                                                     PTHREAD_CREATE_DETACHED)) {
1336                 fprintf(stderr, "can't set thread to detached: %s\n",
1337                         strerror(errno));
1338                 exit(1);
1339         }
1340 }
1341
1342 static int
1343 child (void * param)
1344 {
1345         pthread_t check_thr, uevent_thr, uxlsnr_thr;
1346         pthread_attr_t log_attr, misc_attr;
1347         struct vectors * vecs;
1348         struct multipath * mpp;
1349         int i;
1350
1351         mlockall(MCL_CURRENT | MCL_FUTURE);
1352
1353         setup_thread_attr(&misc_attr, 64 * 1024, 1);
1354         setup_thread_attr(&waiter_attr, 32 * 1024, 1);
1355
1356         if (logsink) {
1357                 setup_thread_attr(&log_attr, 64 * 1024, 0);
1358                 log_thread_start(&log_attr);
1359                 pthread_attr_destroy(&log_attr);
1360         }
1361
1362         condlog(2, "--------start up--------");
1363         condlog(2, "read " DEFAULT_CONFIGFILE);
1364
1365         if (load_config(DEFAULT_CONFIGFILE))
1366                 exit(1);
1367
1368         if (init_checkers()) {
1369                 condlog(0, "failed to initialize checkers");
1370                 exit(1);
1371         }
1372         if (init_prio()) {
1373                 condlog(0, "failed to initialize prioritizers");
1374                 exit(1);
1375         }
1376
1377         setlogmask(LOG_UPTO(conf->verbosity + 3));
1378
1379         /*
1380          * fill the voids left in the config file
1381          */
1382         if (!conf->checkint) {
1383                 conf->checkint = DEFAULT_CHECKINT;
1384                 conf->max_checkint = MAX_CHECKINT(conf->checkint);
1385         }
1386
1387         if (conf->max_fds) {
1388                 struct rlimit fd_limit;
1389
1390                 fd_limit.rlim_cur = conf->max_fds;
1391                 fd_limit.rlim_max = conf->max_fds;
1392                 if (setrlimit(RLIMIT_NOFILE, &fd_limit) < 0)
1393                         condlog(0, "can't set open fds limit to %d : %s\n",
1394                                 conf->max_fds, strerror(errno));
1395         }
1396
1397         if (pidfile_create(DEFAULT_PIDFILE, getpid())) {
1398                 if (logsink)
1399                         log_thread_stop();
1400
1401                 exit(1);
1402         }
1403         signal_init();
1404         setscheduler();
1405         set_oom_adj(-16);
1406         vecs = gvecs = init_vecs();
1407
1408         if (!vecs)
1409                 exit(1);
1410
1411         if (sysfs_init(conf->sysfs_dir, FILE_NAME_SIZE)) {
1412                 condlog(0, "can not find sysfs mount point");
1413                 exit(1);
1414         }
1415         conf->daemon = 1;
1416         dm_udev_set_sync_support(0);
1417         /*
1418          * fetch and configure both paths and multipaths
1419          */
1420         if (configure(vecs, 1)) {
1421                 condlog(0, "failure during configuration");
1422                 exit(1);
1423         }
1424         /*
1425          * start threads
1426          */
1427         pthread_create(&check_thr, &misc_attr, checkerloop, vecs);
1428         pthread_create(&uevent_thr, &misc_attr, ueventloop, vecs);
1429         pthread_create(&uxlsnr_thr, &misc_attr, uxlsnrloop, vecs);
1430         pthread_attr_destroy(&misc_attr);
1431
1432         pthread_mutex_lock(&exit_mutex);
1433         pthread_cond_wait(&exit_cond, &exit_mutex);
1434
1435         /*
1436          * exit path
1437          */
1438         block_signal(SIGHUP, NULL);
1439         lock(vecs->lock);
1440         if (conf->queue_without_daemon == QUE_NO_DAEMON_OFF)
1441                 vector_foreach_slot(vecs->mpvec, mpp, i)
1442                         dm_queue_if_no_path(mpp->alias, 0);
1443         remove_maps_and_stop_waiters(vecs);
1444         free_pathvec(vecs->pathvec, FREE_PATHS);
1445
1446         pthread_cancel(check_thr);
1447         pthread_cancel(uevent_thr);
1448         pthread_cancel(uxlsnr_thr);
1449
1450         sysfs_cleanup();
1451
1452         free_keys(keys);
1453         keys = NULL;
1454         free_handlers(handlers);
1455         handlers = NULL;
1456         free_polls();
1457
1458         unlock(vecs->lock);
1459         /* Now all the waitevent threads will start rushing in. */
1460         while (vecs->lock.depth > 0) {
1461                 sleep (1); /* This is weak. */
1462                 condlog(3,"Have %d wait event checkers threads to de-alloc, waiting..\n", vecs->lock.depth);
1463         }
1464         pthread_mutex_destroy(vecs->lock.mutex);
1465         FREE(vecs->lock.mutex);
1466         vecs->lock.depth = 0;
1467         vecs->lock.mutex = NULL;
1468         FREE(vecs);
1469         vecs = NULL;
1470
1471         condlog(2, "--------shut down-------");
1472
1473         if (logsink)
1474                 log_thread_stop();
1475
1476         dm_lib_release();
1477         dm_lib_exit();
1478
1479         cleanup_prio();
1480         cleanup_checkers();
1481         /*
1482          * Freeing config must be done after condlog() and dm_lib_exit(),
1483          * because logging functions like dlog() and dm_write_log()
1484          * reference the config.
1485          */
1486         free_config(conf);
1487         conf = NULL;
1488
1489 #ifdef _DEBUG_
1490         dbg_free_final(NULL);
1491 #endif
1492
1493         exit(0);
1494 }
1495
1496 static int
1497 daemonize(void)
1498 {
1499         int pid;
1500         int in_fd, out_fd;
1501
1502         if( (pid = fork()) < 0){
1503                 fprintf(stderr, "Failed first fork : %s\n", strerror(errno));
1504                 return -1;
1505         }
1506         else if (pid != 0)
1507                 return pid;
1508
1509         setsid();
1510
1511         if ( (pid = fork()) < 0)
1512                 fprintf(stderr, "Failed second fork : %s\n", strerror(errno));
1513         else if (pid != 0)
1514                 _exit(0);
1515
1516         in_fd = open("/dev/null", O_RDONLY);
1517         if (in_fd < 0){
1518                 fprintf(stderr, "cannot open /dev/null for input : %s\n",
1519                         strerror(errno));
1520                 _exit(0);
1521         }
1522         out_fd = open("/dev/console", O_WRONLY);
1523         if (out_fd < 0){
1524                 fprintf(stderr, "cannot open /dev/console for output : %s\n",
1525                         strerror(errno));
1526                 _exit(0);
1527         }
1528
1529         close(STDIN_FILENO);
1530         dup(in_fd);
1531         close(STDOUT_FILENO);
1532         dup(out_fd);
1533         close(STDERR_FILENO);
1534         dup(out_fd);
1535
1536         close(in_fd);
1537         close(out_fd);
1538         if (chdir("/") < 0)
1539                 fprintf(stderr, "cannot chdir to '/', continuing\n");
1540
1541         return 0;
1542 }
1543
1544 int
1545 main (int argc, char *argv[])
1546 {
1547         extern char *optarg;
1548         extern int optind;
1549         int arg;
1550         int err;
1551
1552         logsink = 1;
1553         dm_init();
1554
1555         if (getuid() != 0) {
1556                 fprintf(stderr, "need to be root\n");
1557                 exit(1);
1558         }
1559
1560         /* make sure we don't lock any path */
1561         chdir("/");
1562         umask(umask(077) | 022);
1563
1564         conf = alloc_config();
1565
1566         if (!conf)
1567                 exit(1);
1568
1569         while ((arg = getopt(argc, argv, ":dv:k::")) != EOF ) {
1570         switch(arg) {
1571                 case 'd':
1572                         logsink = 0;
1573                         //debug=1; /* ### comment me out ### */
1574                         break;
1575                 case 'v':
1576                         if (sizeof(optarg) > sizeof(char *) ||
1577                             !isdigit(optarg[0]))
1578                                 exit(1);
1579
1580                         conf->verbosity = atoi(optarg);
1581                         break;
1582                 case 'k':
1583                         uxclnt(optarg);
1584                         exit(0);
1585                 default:
1586                         ;
1587                 }
1588         }
1589         if (optind < argc) {
1590                 char cmd[CMDSIZE];
1591                 char * s = cmd;
1592                 char * c = s;
1593
1594                 while (optind < argc) {
1595                         if (strchr(argv[optind], ' '))
1596                                 c += snprintf(c, s + CMDSIZE - c, "\"%s\" ", argv[optind]);
1597                         else
1598                                 c += snprintf(c, s + CMDSIZE - c, "%s ", argv[optind]);
1599                         optind++;
1600                 }
1601                 c += snprintf(c, s + CMDSIZE - c, "\n");
1602                 uxclnt(s);
1603                 exit(0);
1604         }
1605
1606         if (!logsink)
1607                 err = 0;
1608         else
1609                 err = daemonize();
1610
1611         if (err < 0)
1612                 /* error */
1613                 exit(1);
1614         else if (err > 0)
1615                 /* parent dies */
1616                 exit(0);
1617         else
1618                 /* child lives */
1619                 return (child(NULL));
1620 }
1621