src/core/plugin.c

   1 /*
   2  * SysDB - src/core/plugin.c
   3  * Copyright (C) 2012 Sebastian 'tokkee' Harl <sh@tokkee.org>
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in the
  13  *    documentation and/or other materials provided with the distribution.
  14  *
  15  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  16  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  17  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  18  * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR
  19  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  20  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  21  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
  22  * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
  23  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
  24  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
  25  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  26  */
  27
  28 #include "sysdb.h"
  29 #include "core/plugin.h"
  30 #include "core/error.h"
  31 #include "core/time.h"
  32 #include "utils/llist.h"
  33
  34 #include <assert.h>
  35
  36 #include <errno.h>
  37
  38 #include <stdarg.h>
  39 #include <stdio.h>
  40 #include <string.h>
  41 #include <strings.h>
  42 #include <unistd.h>
  43
  44 #include <ltdl.h>
  45
  46 #include <pthread.h>
  47
  48 /*
  49  * private data types
  50  */
  51
  52 struct sdb_plugin_info {
  53         char *name;
  54
  55         char *description;
  56         char *copyright;
  57         char *license;
  58
  59         int   version;
  60         int   plugin_version;
  61 };
  62 #define SDB_PLUGIN_INFO_INIT { "no name set", "no description set", \
  63         /* copyright */ "", /* license */ "", \
  64         /* version */ -1, /* plugin_version */ -1 }
  65
  66 typedef struct {
  67         sdb_object_t super;
  68         void *cb_callback;
  69         sdb_object_t *cb_user_data;
  70         sdb_plugin_ctx_t cb_ctx;
  71 } sdb_plugin_cb_t;
  72 #define SDB_PLUGIN_CB_INIT { SDB_OBJECT_INIT, \
  73         /* callback = */ NULL, /* user_data = */ NULL, \
  74         SDB_PLUGIN_CTX_INIT }
  75
  76 typedef struct {
  77         sdb_plugin_cb_t super;
  78 #define ccb_callback super.cb_callback
  79 #define ccb_user_data super.cb_user_data
  80 #define ccb_ctx super.cb_ctx
  81         sdb_time_t ccb_interval;
  82         sdb_time_t ccb_next_update;
  83 } sdb_plugin_collector_cb_t;
  84
  85 #define SDB_PLUGIN_CB(obj) ((sdb_plugin_cb_t *)(obj))
  86 #define SDB_PLUGIN_CCB(obj) ((sdb_plugin_collector_cb_t *)(obj))
  87
  88 /*
  89  * private variables
  90  */
  91
  92 static sdb_plugin_ctx_t  plugin_default_ctx = SDB_PLUGIN_CTX_INIT;
  93
  94 static pthread_key_t    plugin_ctx_key;
  95 static _Bool            plugin_ctx_key_initialized = 0;
  96
  97 static sdb_llist_t      *config_list = NULL;
  98 static sdb_llist_t      *init_list = NULL;
  99 static sdb_llist_t      *collector_list = NULL;
 100 static sdb_llist_t      *shutdown_list = NULL;
 101 static sdb_llist_t      *log_list = NULL;
 102
 103 /*
 104  * private helper functions
 105  */
 106
 107 static void
 108 sdb_plugin_ctx_destructor(void *ctx)
 109 {
 110         if (! ctx)
 111                 return;
 112         free(ctx);
 113 } /* sdb_plugin_ctx_destructor */
 114
 115 static void
 116 sdb_plugin_ctx_init(void)
 117 {
 118         if (plugin_ctx_key_initialized)
 119                 return;
 120
 121         pthread_key_create(&plugin_ctx_key, sdb_plugin_ctx_destructor);
 122         plugin_ctx_key_initialized = 1;
 123 } /* sdb_plugin_ctx_init */
 124
 125 static sdb_plugin_ctx_t *
 126 sdb_plugin_ctx_create(void)
 127 {
 128         sdb_plugin_ctx_t *ctx;
 129
 130         ctx = malloc(sizeof(*ctx));
 131         if (! ctx)
 132                 return NULL;
 133
 134         *ctx = plugin_default_ctx;
 135
 136         if (! plugin_ctx_key_initialized)
 137                 sdb_plugin_ctx_init();
 138         pthread_setspecific(plugin_ctx_key, ctx);
 139         return ctx;
 140 } /* sdb_plugin_ctx_create */
 141
 142 static int
 143 sdb_plugin_cmp_next_update(const sdb_object_t *a, const sdb_object_t *b)
 144 {
 145         const sdb_plugin_collector_cb_t *ccb1
 146                 = (const sdb_plugin_collector_cb_t *)a;
 147         const sdb_plugin_collector_cb_t *ccb2
 148                 = (const sdb_plugin_collector_cb_t *)b;
 149
 150         assert(ccb1 && ccb2);
 151
 152         return (ccb1->ccb_next_update > ccb2->ccb_next_update)
 153                 ? 1 : (ccb1->ccb_next_update < ccb2->ccb_next_update)
 154                 ? -1 : 0;
 155 } /* sdb_plugin_cmp_next_update */
 156
 157 /*
 158  * private types
 159  */
 160
 161 static int
 162 sdb_plugin_cb_init(sdb_object_t *obj, va_list ap)
 163 {
 164         sdb_llist_t **list = va_arg(ap, sdb_llist_t **);
 165         const char   *type = va_arg(ap, const char *);
 166         void     *callback = va_arg(ap, void *);
 167         sdb_object_t   *ud = va_arg(ap, sdb_object_t *);
 168
 169         assert(list);
 170         assert(type);
 171         assert(obj);
 172
 173         if (sdb_llist_search_by_name(*list, obj->name)) {
 174                 sdb_log(SDB_LOG_WARNING, "plugin: %s callback '%s' "
 175                                 "has already been registered. Ignoring newly "
 176                                 "registered version.", type, obj->name);
 177                 return -1;
 178         }
 179
 180         SDB_PLUGIN_CB(obj)->cb_callback = callback;
 181         SDB_PLUGIN_CB(obj)->cb_ctx      = sdb_plugin_get_ctx();
 182
 183         sdb_object_ref(ud);
 184         SDB_PLUGIN_CB(obj)->cb_user_data = ud;
 185         return 0;
 186 } /* sdb_plugin_cb_init */
 187
 188 static void
 189 sdb_plugin_cb_destroy(sdb_object_t *obj)
 190 {
 191         assert(obj);
 192         sdb_object_deref(SDB_PLUGIN_CB(obj)->cb_user_data);
 193 } /* sdb_plugin_cb_destroy */
 194
 195 static sdb_type_t sdb_plugin_cb_type = {
 196         sizeof(sdb_plugin_cb_t),
 197
 198         sdb_plugin_cb_init,
 199         sdb_plugin_cb_destroy,
 200         /* clone = */ NULL
 201 };
 202
 203 static sdb_type_t sdb_plugin_collector_cb_type = {
 204         sizeof(sdb_plugin_collector_cb_t),
 205
 206         sdb_plugin_cb_init,
 207         sdb_plugin_cb_destroy,
 208         /* clone = */ NULL
 209 };
 210
 211 static int
 212 sdb_plugin_add_callback(sdb_llist_t **list, const char *type,
 213                 const char *name, void *callback, sdb_object_t *user_data)
 214 {
 215         sdb_object_t *obj;
 216
 217         if ((! name) || (! callback))
 218                 return -1;
 219
 220         assert(list);
 221
 222         if (! *list)
 223                 *list = sdb_llist_create();
 224         if (! *list)
 225                 return -1;
 226
 227         obj = sdb_object_create(name, sdb_plugin_cb_type,
 228                         list, type, callback, user_data);
 229         if (! obj)
 230                 return -1;
 231
 232         if (sdb_llist_append(*list, obj)) {
 233                 sdb_object_deref(obj);
 234                 return -1;
 235         }
 236
 237         /* pass control to the list */
 238         sdb_object_deref(obj);
 239
 240         sdb_log(SDB_LOG_INFO, "plugin: Registered %s callback '%s'.",
 241                         type, name);
 242         return 0;
 243 } /* sdb_plugin_add_callback */
 244
 245 /*
 246  * public API
 247  */
 248
 249 int
 250 sdb_plugin_load(const char *name)
 251 {
 252         char  real_name[strlen(name) > 0 ? strlen(name) : 1];
 253         const char *name_ptr;
 254         char *tmp;
 255
 256         char filename[1024];
 257
 258         lt_dlhandle lh;
 259
 260         int (*mod_init)(sdb_plugin_info_t *);
 261         sdb_plugin_info_t plugin_info = SDB_PLUGIN_INFO_INIT;
 262
 263         int status;
 264
 265         if ((! name) || (! *name))
 266                 return -1;
 267
 268         real_name[0] = '\0';
 269         name_ptr = name;
 270
 271         while ((tmp = strstr(name_ptr, "::"))) {
 272                 strncat(real_name, name_ptr, (size_t)(tmp - name_ptr));
 273                 strcat(real_name, "/");
 274                 name_ptr = tmp + strlen("::");
 275         }
 276         strcat(real_name, name_ptr);
 277
 278         snprintf(filename, sizeof(filename), "%s/%s.so",
 279                         PKGLIBDIR, real_name);
 280         filename[sizeof(filename) - 1] = '\0';
 281
 282         if (access(filename, R_OK)) {
 283                 char errbuf[1024];
 284                 sdb_log(SDB_LOG_ERR, "plugin: Failed to load plugin '%s' (%s): %s",
 285                                 name, filename, sdb_strerror(errno, errbuf, sizeof(errbuf)));
 286                 return -1;
 287         }
 288
 289         lt_dlinit();
 290         lt_dlerror();
 291
 292         lh = lt_dlopen(filename);
 293         if (! lh) {
 294                 sdb_log(SDB_LOG_ERR, "plugin: Failed to load plugin '%s': %s"
 295                                 "The most common cause for this problem are missing "
 296                                 "dependencies.\n", name, lt_dlerror());
 297                 return -1;
 298         }
 299
 300         mod_init = (int (*)(sdb_plugin_info_t *))lt_dlsym(lh, "sdb_module_init");
 301         if (! mod_init) {
 302                 sdb_log(SDB_LOG_ERR, "plugin: Failed to load plugin '%s': "
 303                                 "could not find symbol 'sdb_module_init'", name);
 304                 return -1;
 305         }
 306
 307         status = mod_init(&plugin_info);
 308         if (status) {
 309                 sdb_log(SDB_LOG_ERR, "plugin: Failed to initialize "
 310                                 "plugin '%s'", name);
 311                 return -1;
 312         }
 313
 314         /* compare minor version */
 315         if ((plugin_info.version < 0)
 316                         || ((int)(plugin_info.version / 100) != (int)(SDB_VERSION / 100)))
 317                 sdb_log(SDB_LOG_WARNING, "plugin: WARNING: version of "
 318                                 "plugin '%s' (%i.%i.%i) does not match our version "
 319                                 "(%i.%i.%i); this might cause problems",
 320                                 name, SDB_VERSION_DECODE(plugin_info.version),
 321                                 SDB_VERSION_DECODE(SDB_VERSION));
 322
 323         sdb_log(SDB_LOG_INFO, "plugin: Successfully loaded "
 324                         "plugin '%s' v%i (%s)\n\t%s",
 325                         plugin_info.name, plugin_info.plugin_version,
 326                         plugin_info.description, plugin_info.copyright);
 327         return 0;
 328 } /* sdb_plugin_load */
 329
 330 int
 331 sdb_plugin_set_info(sdb_plugin_info_t *info, int type, ...)
 332 {
 333         va_list ap;
 334
 335         if (! info)
 336                 return -1;
 337
 338         va_start(ap, type);
 339
 340         switch (type) {
 341                 case SDB_PLUGIN_INFO_NAME:
 342                         {
 343                                 char *name = va_arg(ap, char *);
 344                                 info->name = name;
 345                         }
 346                         break;
 347                 case SDB_PLUGIN_INFO_DESC:
 348                         {
 349                                 char *desc = va_arg(ap, char *);
 350                                 info->description = desc;
 351                         }
 352                         break;
 353                 case SDB_PLUGIN_INFO_COPYRIGHT:
 354                         {
 355                                 char *copyright = va_arg(ap, char *);
 356                                 info->copyright = copyright;
 357                         }
 358                         break;
 359                 case SDB_PLUGIN_INFO_LICENSE:
 360                         {
 361                                 char *license = va_arg(ap, char *);
 362                                 info->license = license;
 363                         }
 364                         break;
 365                 case SDB_PLUGIN_INFO_VERSION:
 366                         {
 367                                 int version = va_arg(ap, int);
 368                                 info->version = version;
 369                         }
 370                         break;
 371                 case SDB_PLUGIN_INFO_PLUGIN_VERSION:
 372                         {
 373                                 int version = va_arg(ap, int);
 374                                 info->plugin_version = version;
 375                         }
 376                         break;
 377                 default:
 378                         va_end(ap);
 379                         return -1;
 380         }
 381
 382         va_end(ap);
 383         return 0;
 384 } /* sdb_plugin_set_info */
 385
 386 int
 387 sdb_plugin_register_config(const char *name, sdb_plugin_config_cb callback)
 388 {
 389         return sdb_plugin_add_callback(&config_list, "init", name,
 390                         callback, NULL);
 391 } /* sdb_plugin_register_config */
 392
 393 int
 394 sdb_plugin_register_init(const char *name, sdb_plugin_init_cb callback,
 395                 sdb_object_t *user_data)
 396 {
 397         return sdb_plugin_add_callback(&init_list, "init", name,
 398                         callback, user_data);
 399 } /* sdb_plugin_register_init */
 400
 401 int
 402 sdb_plugin_register_shutdown(const char *name, sdb_plugin_shutdown_cb callback,
 403                 sdb_object_t *user_data)
 404 {
 405         return sdb_plugin_add_callback(&shutdown_list, "shutdown", name,
 406                         callback, user_data);
 407 } /* sdb_plugin_register_shutdown */
 408
 409 int
 410 sdb_plugin_register_log(const char *name, sdb_plugin_log_cb callback,
 411                 sdb_object_t *user_data)
 412 {
 413         return sdb_plugin_add_callback(&log_list, "log", name, callback,
 414                         user_data);
 415 } /* sdb_plugin_register_log */
 416
 417 int
 418 sdb_plugin_register_collector(const char *name, sdb_plugin_collector_cb callback,
 419                 const sdb_time_t *interval, sdb_object_t *user_data)
 420 {
 421         sdb_object_t *obj;
 422
 423         if ((! name) || (! callback))
 424                 return -1;
 425
 426         if (! collector_list)
 427                 collector_list = sdb_llist_create();
 428         if (! collector_list)
 429                 return -1;
 430
 431         obj = sdb_object_create(name, sdb_plugin_collector_cb_type,
 432                         &collector_list, "collector", callback, user_data);
 433         if (! obj)
 434                 return -1;
 435
 436         if (interval)
 437                 SDB_PLUGIN_CCB(obj)->ccb_interval = *interval;
 438         else {
 439                 sdb_time_t tmp = sdb_plugin_get_ctx().interval;
 440
 441                 if (tmp > 0)
 442                         SDB_PLUGIN_CCB(obj)->ccb_interval = tmp;
 443                 else
 444                         SDB_PLUGIN_CCB(obj)->ccb_interval = 0;
 445         }
 446
 447         if (! (SDB_PLUGIN_CCB(obj)->ccb_next_update = sdb_gettime())) {
 448                 char errbuf[1024];
 449                 sdb_log(SDB_LOG_ERR, "plugin: Failed to determine current "
 450                                 "time: %s", sdb_strerror(errno, errbuf, sizeof(errbuf)));
 451                 sdb_object_deref(obj);
 452                 return -1;
 453         }
 454
 455         if (sdb_llist_insert_sorted(collector_list, obj,
 456                                 sdb_plugin_cmp_next_update)) {
 457                 sdb_object_deref(obj);
 458                 return -1;
 459         }
 460
 461         /* pass control to the list */
 462         sdb_object_deref(obj);
 463
 464         sdb_log(SDB_LOG_INFO, "plugin: Registered collector callback '%s' "
 465                         "(interval = %.3fs).", name,
 466                         SDB_TIME_TO_DOUBLE(SDB_PLUGIN_CCB(obj)->ccb_interval));
 467         return 0;
 468 } /* sdb_plugin_register_collector */
 469
 470 sdb_plugin_ctx_t
 471 sdb_plugin_get_ctx(void)
 472 {
 473         sdb_plugin_ctx_t *ctx;
 474
 475         if (! plugin_ctx_key_initialized)
 476                 sdb_plugin_ctx_init();
 477         ctx = pthread_getspecific(plugin_ctx_key);
 478
 479         if (! ctx)
 480                 ctx = sdb_plugin_ctx_create();
 481         if (! ctx)
 482                 return plugin_default_ctx;
 483         return *ctx;
 484 } /* sdb_plugin_get_ctx */
 485
 486 sdb_plugin_ctx_t
 487 sdb_plugin_set_ctx(sdb_plugin_ctx_t ctx)
 488 {
 489         sdb_plugin_ctx_t *tmp;
 490         sdb_plugin_ctx_t old;
 491
 492         if (! plugin_ctx_key_initialized)
 493                 sdb_plugin_ctx_init();
 494         tmp = pthread_getspecific(plugin_ctx_key);
 495
 496         if (! tmp)
 497                 tmp = sdb_plugin_ctx_create();
 498         if (! tmp)
 499                 return plugin_default_ctx;
 500
 501         old = *tmp;
 502         *tmp = ctx;
 503         return old;
 504 } /* sdb_plugin_set_ctx */
 505
 506 int
 507 sdb_plugin_configure(const char *name, oconfig_item_t *ci)
 508 {
 509         sdb_plugin_cb_t *plugin;
 510         sdb_plugin_config_cb callback;
 511
 512         sdb_plugin_ctx_t old_ctx;
 513
 514         int status;
 515
 516         if ((! name) || (! ci))
 517                 return -1;
 518
 519         plugin = SDB_PLUGIN_CB(sdb_llist_search_by_name(config_list, name));
 520         if (! plugin) {
 521                 /* XXX: check if any such plugin has been loaded */
 522                 sdb_log(SDB_LOG_ERR, "plugin: Plugin '%s' did not register "
 523                                 "a config callback.", name);
 524                 errno = ENOENT;
 525                 return -1;
 526         }
 527
 528         old_ctx = sdb_plugin_set_ctx(plugin->cb_ctx);
 529         callback = plugin->cb_callback;
 530         status = callback(ci);
 531         sdb_plugin_set_ctx(old_ctx);
 532         return status;
 533 } /* sdb_plugin_configure */
 534
 535 int
 536 sdb_plugin_init_all(void)
 537 {
 538         sdb_llist_iter_t *iter;
 539
 540         iter = sdb_llist_get_iter(init_list);
 541         while (sdb_llist_iter_has_next(iter)) {
 542                 sdb_plugin_init_cb callback;
 543                 sdb_plugin_ctx_t old_ctx;
 544
 545                 sdb_object_t *obj = sdb_llist_iter_get_next(iter);
 546                 assert(obj);
 547
 548                 callback = SDB_PLUGIN_CB(obj)->cb_callback;
 549
 550                 old_ctx = sdb_plugin_set_ctx(SDB_PLUGIN_CB(obj)->cb_ctx);
 551                 if (callback(SDB_PLUGIN_CB(obj)->cb_user_data)) {
 552                         /* XXX: unload plugin */
 553                 }
 554                 sdb_plugin_set_ctx(old_ctx);
 555         }
 556         sdb_llist_iter_destroy(iter);
 557         return 0;
 558 } /* sdb_plugin_init_all */
 559
 560 int
 561 sdb_plugin_collector_loop(sdb_plugin_loop_t *loop)
 562 {
 563         if (! collector_list) {
 564                 sdb_log(SDB_LOG_WARNING, "plugin: No collectors registered. "
 565                                 "Quiting main loop.");
 566                 return -1;
 567         }
 568
 569         if (! loop)
 570                 return -1;
 571
 572         while (loop->do_loop) {
 573                 sdb_plugin_collector_cb callback;
 574                 sdb_plugin_ctx_t old_ctx;
 575
 576                 sdb_time_t interval, now;
 577
 578                 sdb_object_t *obj = sdb_llist_shift(collector_list);
 579                 if (! obj)
 580                         return -1;
 581
 582                 callback = SDB_PLUGIN_CCB(obj)->ccb_callback;
 583
 584                 if (! (now = sdb_gettime())) {
 585                         char errbuf[1024];
 586                         sdb_log(SDB_LOG_ERR, "plugin: Failed to determine current "
 587                                         "time: %s", sdb_strerror(errno, errbuf, sizeof(errbuf)));
 588                         now = SDB_PLUGIN_CCB(obj)->ccb_next_update;
 589                 }
 590
 591                 if (now < SDB_PLUGIN_CCB(obj)->ccb_next_update) {
 592                         interval = SDB_PLUGIN_CCB(obj)->ccb_next_update - now;
 593
 594                         errno = 0;
 595                         while (loop->do_loop && sdb_sleep(interval, &interval)) {
 596                                 if (errno != EINTR) {
 597                                         char errbuf[1024];
 598                                         sdb_log(SDB_LOG_ERR, "plugin: Failed to sleep: %s",
 599                                                         sdb_strerror(errno, errbuf, sizeof(errbuf)));
 600                                         return -1;
 601                                 }
 602                                 errno = 0;
 603                         }
 604
 605                         if (! loop->do_loop)
 606                                 return 0;
 607                 }
 608
 609                 old_ctx = sdb_plugin_set_ctx(SDB_PLUGIN_CCB(obj)->ccb_ctx);
 610                 if (callback(SDB_PLUGIN_CCB(obj)->ccb_user_data)) {
 611                         /* XXX */
 612                 }
 613                 sdb_plugin_set_ctx(old_ctx);
 614
 615                 interval = SDB_PLUGIN_CCB(obj)->ccb_interval;
 616                 if (! interval)
 617                         interval = loop->default_interval;
 618                 if (! interval) {
 619                         sdb_log(SDB_LOG_WARNING, "plugin: No interval configured "
 620                                         "for plugin '%s'; skipping any further "
 621                                         "iterations.", obj->name);
 622                         sdb_object_deref(obj);
 623                         continue;
 624                 }
 625
 626                 SDB_PLUGIN_CCB(obj)->ccb_next_update += interval;
 627
 628                 if (! (now = sdb_gettime())) {
 629                         char errbuf[1024];
 630                         sdb_log(SDB_LOG_ERR, "plugin: Failed to determine current "
 631                                         "time: %s", sdb_strerror(errno, errbuf, sizeof(errbuf)));
 632                         now = SDB_PLUGIN_CCB(obj)->ccb_next_update;
 633                 }
 634
 635                 if (now > SDB_PLUGIN_CCB(obj)->ccb_next_update) {
 636                         sdb_log(SDB_LOG_WARNING, "plugin: Plugin '%s' took too "
 637                                         "long; skipping iterations to keep up.",
 638                                         obj->name);
 639                         SDB_PLUGIN_CCB(obj)->ccb_next_update = now;
 640                 }
 641
 642                 if (sdb_llist_insert_sorted(collector_list, obj,
 643                                         sdb_plugin_cmp_next_update)) {
 644                         sdb_log(SDB_LOG_ERR, "plugin: Failed to re-insert "
 645                                         "plugin '%s' into collector list. Unable to further "
 646                                         "use the plugin.",
 647                                         obj->name);
 648                         sdb_object_deref(obj);
 649                         return -1;
 650                 }
 651
 652                 /* pass control back to the list */
 653                 sdb_object_deref(obj);
 654         }
 655         return 0;
 656 } /* sdb_plugin_read_loop */
 657
 658 int
 659 sdb_plugin_log(int prio, const char *msg)
 660 {
 661         sdb_llist_iter_t *iter;
 662         int ret = -1;
 663
 664         if (! log_list)
 665                 return fprintf(stderr, "[%s] %s\n", SDB_LOG_PRIO_TO_STRING(prio), msg);
 666
 667         iter = sdb_llist_get_iter(log_list);
 668         while (sdb_llist_iter_has_next(iter)) {
 669                 sdb_plugin_log_cb callback;
 670                 int tmp;
 671
 672                 sdb_object_t *obj = sdb_llist_iter_get_next(iter);
 673                 assert(obj);
 674
 675                 callback = SDB_PLUGIN_CB(obj)->cb_callback;
 676                 tmp = callback(prio, msg, SDB_PLUGIN_CB(obj)->cb_user_data);
 677                 if (tmp > ret)
 678                         ret = tmp;
 679         }
 680         sdb_llist_iter_destroy(iter);
 681         return ret;
 682 } /* sdb_plugin_log */
 683
 684 /* vim: set tw=78 sw=4 ts=4 noexpandtab : */
 685