git.sesse.net Git - cubemap/blob - main.cpp

   1 #include <assert.h>
   2 #include <errno.h>
   3 #include <getopt.h>
   4 #include <limits.h>
   5 #include <signal.h>
   6 #include <stddef.h>
   7 #include <stdio.h>
   8 #include <stdlib.h>
   9 #include <string.h>
  10 #include <sys/time.h>
  11 #include <sys/wait.h>
  12 #include <systemd/sd-daemon.h>
  13 #include <unistd.h>
  14 #include <algorithm>
  15 #include <map>
  16 #include <set>
  17 #include <string>
  18 #include <utility>
  19 #include <vector>
  20
  21 #include "tlse.h"
  22
  23 #include "acceptor.h"
  24 #include "accesslog.h"
  25 #include "config.h"
  26 #include "input.h"
  27 #include "input_stats.h"
  28 #include "log.h"
  29 #include "sa_compare.h"
  30 #include "serverpool.h"
  31 #include "state.pb.h"
  32 #include "stats.h"
  33 #include "stream.h"
  34 #include "util.h"
  35 #include "version.h"
  36
  37 using namespace std;
  38
  39 AccessLogThread *access_log = NULL;
  40 ServerPool *servers = NULL;
  41 volatile bool hupped = false;
  42 volatile bool stopped = false;
  43
  44 typedef pair<string, Input::Encoding> InputKey;
  45
  46 namespace {
  47
  48 struct OrderByConnectionTime {
  49         bool operator() (const ClientProto &a, const ClientProto &b) const {
  50                 if (a.connect_time_sec() != b.connect_time_sec())
  51                         return a.connect_time_sec() < b.connect_time_sec();
  52                 return a.connect_time_nsec() < b.connect_time_nsec();
  53         }
  54 };
  55
  56 // An arbitrary ordering.
  57 struct AcceptorConfigCompare {
  58         bool operator() (const AcceptorConfig &a, const AcceptorConfig &b) const {
  59                 int cmp = a.certificate_chain.compare(b.certificate_chain);
  60                 if (cmp != 0) {
  61                         return cmp < 0;
  62                 }
  63
  64                 cmp = a.private_key.compare(b.private_key);
  65                 if (cmp != 0) {
  66                         return cmp < 0;
  67                 }
  68
  69                 return Sockaddr6Compare()(a.addr, b.addr);
  70         }
  71 };
  72
  73 }  // namespace
  74
  75 struct InputWithRefcount {
  76         Input *input;
  77         int refcount;
  78 };
  79
  80 void hup(int signum)
  81 {
  82         hupped = true;
  83         if (signum == SIGINT) {
  84                 stopped = true;
  85         }
  86 }
  87
  88 void do_nothing(int signum)
  89 {
  90 }
  91
  92 CubemapStateProto collect_state(const timespec &serialize_start,
  93                                 const vector<Acceptor *> acceptors,
  94                                 const multimap<InputKey, InputWithRefcount> inputs,
  95                                 ServerPool *servers)
  96 {
  97         CubemapStateProto state = servers->serialize();  // Fills streams() and clients().
  98         state.set_serialize_start_sec(serialize_start.tv_sec);
  99         state.set_serialize_start_usec(serialize_start.tv_nsec / 1000);
 100
 101         for (size_t i = 0; i < acceptors.size(); ++i) {
 102                 state.add_acceptors()->MergeFrom(acceptors[i]->serialize());
 103         }
 104
 105         for (multimap<InputKey, InputWithRefcount>::const_iterator input_it = inputs.begin();
 106              input_it != inputs.end();
 107              ++input_it) {
 108                 state.add_inputs()->MergeFrom(input_it->second.input->serialize());
 109         }
 110
 111         return state;
 112 }
 113
 114 // Find all port statements in the configuration file, and create acceptors for them.
 115 vector<Acceptor *> create_acceptors(
 116         const Config &config,
 117         map<AcceptorConfig, Acceptor *, AcceptorConfigCompare> *deserialized_acceptors)
 118 {
 119         vector<Acceptor *> acceptors;
 120         for (unsigned i = 0; i < config.acceptors.size(); ++i) {
 121                 const AcceptorConfig &acceptor_config = config.acceptors[i];
 122                 Acceptor *acceptor = NULL;
 123                 map<AcceptorConfig, Acceptor *, AcceptorConfigCompare>::iterator deserialized_acceptor_it =
 124                         deserialized_acceptors->find(acceptor_config);
 125                 if (deserialized_acceptor_it != deserialized_acceptors->end()) {
 126                         acceptor = deserialized_acceptor_it->second;
 127                         deserialized_acceptors->erase(deserialized_acceptor_it);
 128                 } else {
 129                         int server_sock = create_server_socket(acceptor_config.addr, TCP_SOCKET);
 130                         acceptor = new Acceptor(server_sock, acceptor_config.addr,
 131                                                 acceptor_config.certificate_chain,
 132                                                 acceptor_config.private_key);
 133                 }
 134                 acceptor->run();
 135                 acceptors.push_back(acceptor);
 136         }
 137
 138         // Close all acceptors that are no longer in the configuration file.
 139         for (map<AcceptorConfig, Acceptor *, AcceptorConfigCompare>::iterator
 140                  acceptor_it = deserialized_acceptors->begin();
 141              acceptor_it != deserialized_acceptors->end();
 142              ++acceptor_it) {
 143                 acceptor_it->second->close_socket();
 144                 delete acceptor_it->second;
 145         }
 146
 147         return acceptors;
 148 }
 149
 150 void create_config_input(const string &src, Input::Encoding encoding, multimap<InputKey, InputWithRefcount> *inputs)
 151 {
 152         if (src.empty()) {
 153                 return;
 154         }
 155         InputKey key(src, encoding);
 156         if (inputs->count(key) != 0) {
 157                 return;
 158         }
 159
 160         InputWithRefcount iwr;
 161         iwr.input = create_input(src, encoding);
 162         if (iwr.input == NULL) {
 163                 log(ERROR, "did not understand URL '%s' or source encoding was invalid, clients will not get any data.",
 164                         src.c_str());
 165                 return;
 166         }
 167         iwr.refcount = 0;
 168         inputs->insert(make_pair(key, iwr));
 169 }
 170
 171 // Find all streams in the configuration file, and create inputs for them.
 172 void create_config_inputs(const Config &config, multimap<InputKey, InputWithRefcount> *inputs)
 173 {
 174         for (unsigned i = 0; i < config.streams.size(); ++i) {
 175                 const StreamConfig &stream_config = config.streams[i];
 176                 if (stream_config.src != "delete") {
 177                         create_config_input(stream_config.src, Input::Encoding(stream_config.src_encoding), inputs);
 178                 }
 179         }
 180         for (unsigned i = 0; i < config.udpstreams.size(); ++i) {
 181                 const UDPStreamConfig &udpstream_config = config.udpstreams[i];
 182                 create_config_input(udpstream_config.src, Input::INPUT_ENCODING_RAW, inputs);
 183         }
 184 }
 185
 186 void create_streams(const Config &config,
 187                     const set<string> &deserialized_urls,
 188                     multimap<InputKey, InputWithRefcount> *inputs)
 189 {
 190         // HTTP streams.
 191         set<string> expecting_urls = deserialized_urls;
 192         for (unsigned i = 0; i < config.streams.size(); ++i) {
 193                 const StreamConfig &stream_config = config.streams[i];
 194                 int stream_index;
 195
 196                 expecting_urls.erase(stream_config.url);
 197
 198                 // Special-case deleted streams; they were never deserialized in the first place,
 199                 // so just ignore them.
 200                 if (stream_config.src == "delete") {
 201                         continue;
 202                 }
 203
 204                 if (deserialized_urls.count(stream_config.url) == 0) {
 205                         stream_index = servers->add_stream(stream_config.url,
 206                                                            stream_config.backlog_size,
 207                                                            stream_config.prebuffering_bytes,
 208                                                            Stream::Encoding(stream_config.encoding),
 209                                                            Stream::Encoding(stream_config.src_encoding));
 210                 } else {
 211                         stream_index = servers->lookup_stream_by_url(stream_config.url);
 212                         assert(stream_index != -1);
 213                         servers->set_backlog_size(stream_index, stream_config.backlog_size);
 214                         servers->set_prebuffering_bytes(stream_index, stream_config.prebuffering_bytes);
 215                         servers->set_encoding(stream_index,
 216                                               Stream::Encoding(stream_config.encoding));
 217                         servers->set_src_encoding(stream_index,
 218                                                   Stream::Encoding(stream_config.src_encoding));
 219                 }
 220
 221                 servers->set_pacing_rate(stream_index, stream_config.pacing_rate);
 222
 223                 string src = stream_config.src;
 224                 Input::Encoding src_encoding = Input::Encoding(stream_config.src_encoding);
 225                 if (!src.empty()) {
 226                         multimap<InputKey, InputWithRefcount>::iterator input_it = inputs->find(make_pair(src, src_encoding));
 227                         if (input_it != inputs->end()) {
 228                                 input_it->second.input->add_destination(stream_index);
 229                                 ++input_it->second.refcount;
 230                         }
 231                 }
 232         }
 233
 234         // Warn about any streams servers we've lost.
 235         for (set<string>::const_iterator stream_it = expecting_urls.begin();
 236              stream_it != expecting_urls.end();
 237              ++stream_it) {
 238                 string url = *stream_it;
 239                 log(WARNING, "stream '%s' disappeared from the configuration file. "
 240                              "It will not be deleted, but clients will not get any new inputs. "
 241                              "If you really meant to delete it, set src=delete and reload.",
 242                              url.c_str());
 243         }
 244
 245         // UDP streams.
 246         for (unsigned i = 0; i < config.udpstreams.size(); ++i) {
 247                 const UDPStreamConfig &udpstream_config = config.udpstreams[i];
 248                 int stream_index = servers->add_udpstream(
 249                         udpstream_config.dst,
 250                         udpstream_config.pacing_rate,
 251                         udpstream_config.ttl,
 252                         udpstream_config.multicast_iface_index);
 253
 254                 string src = udpstream_config.src;
 255                 if (!src.empty()) {
 256                         multimap<InputKey, InputWithRefcount>::iterator input_it = inputs->find(make_pair(src, Input::INPUT_ENCODING_RAW));
 257                         assert(input_it != inputs->end());
 258                         input_it->second.input->add_destination(stream_index);
 259                         ++input_it->second.refcount;
 260                 }
 261         }
 262
 263         // HTTP gen204 endpoints.
 264         for (unsigned i = 0; i < config.pings.size(); ++i) {
 265                 const Gen204Config &ping_config = config.pings[i];
 266                 servers->add_gen204(ping_config.url, ping_config.allow_origin);
 267         }
 268 }
 269
 270 void open_logs(const vector<LogConfig> &log_destinations)
 271 {
 272         for (size_t i = 0; i < log_destinations.size(); ++i) {
 273                 if (log_destinations[i].type == LogConfig::LOG_TYPE_FILE) {
 274                         add_log_destination_file(log_destinations[i].filename);
 275                 } else if (log_destinations[i].type == LogConfig::LOG_TYPE_CONSOLE) {
 276                         add_log_destination_console();
 277                 } else if (log_destinations[i].type == LogConfig::LOG_TYPE_SYSLOG) {
 278                         add_log_destination_syslog();
 279                 } else {
 280                         assert(false);
 281                 }
 282         }
 283         start_logging();
 284 }
 285
 286 bool dry_run_config(const string &argv0, const string &config_filename)
 287 {
 288         char *argv0_copy = strdup(argv0.c_str());
 289         char *config_filename_copy = strdup(config_filename.c_str());
 290
 291         pid_t pid = fork();
 292         switch (pid) {
 293         case -1:
 294                 log_perror("fork()");
 295                 free(argv0_copy);
 296                 free(config_filename_copy);
 297                 return false;
 298         case 0:
 299                 // Child.
 300                 execlp(argv0_copy, argv0_copy, "--test-config", config_filename_copy, NULL);
 301                 log_perror(argv0_copy);
 302                 _exit(1);
 303         default:
 304                 // Parent.
 305                 break;
 306         }
 307
 308         free(argv0_copy);
 309         free(config_filename_copy);
 310
 311         int status;
 312         pid_t err;
 313         do {
 314                 err = waitpid(pid, &status, 0);
 315         } while (err == -1 && errno == EINTR);
 316
 317         if (err == -1) {
 318                 log_perror("waitpid()");
 319                 return false;
 320         }
 321
 322         return (WIFEXITED(status) && WEXITSTATUS(status) == 0);
 323 }
 324
 325 void find_deleted_streams(const Config &config, set<string> *deleted_urls)
 326 {
 327         for (unsigned i = 0; i < config.streams.size(); ++i) {
 328                 const StreamConfig &stream_config = config.streams[i];
 329                 if (stream_config.src == "delete") {
 330                         log(INFO, "Deleting stream '%s'.", stream_config.url.c_str());
 331                         deleted_urls->insert(stream_config.url);
 332                 }
 333         }
 334 }
 335
 336 int main(int argc, char **argv)
 337 {
 338         signal(SIGHUP, hup);
 339         signal(SIGINT, hup);
 340         signal(SIGUSR1, do_nothing);  // Used in internal signalling.
 341         signal(SIGPIPE, SIG_IGN);
 342
 343         tls_init();
 344
 345         // Parse options.
 346         int state_fd = -1;
 347         bool test_config = false;
 348         for ( ;; ) {
 349                 static const option long_options[] = {
 350                         { "state", required_argument, 0, 's' },
 351                         { "test-config", no_argument, 0, 't' },
 352                         { 0, 0, 0, 0 }
 353                 };
 354                 int option_index = 0;
 355                 int c = getopt_long(argc, argv, "s:t", long_options, &option_index);
 356
 357                 if (c == -1) {
 358                         break;
 359                 }
 360                 switch (c) {
 361                 case 's':
 362                         state_fd = atoi(optarg);
 363                         break;
 364                 case 't':
 365                         test_config = true;
 366                         break;
 367                 default:
 368                         fprintf(stderr, "Unknown option '%s'\n", argv[option_index]);
 369                         exit(1);
 370                 }
 371         }
 372
 373         string config_filename = "cubemap.config";
 374         if (optind < argc) {
 375                 config_filename = argv[optind++];
 376         }
 377
 378         // Canonicalize argv[0] and config_filename.
 379         char argv0_canon[PATH_MAX];
 380         char config_filename_canon[PATH_MAX];
 381
 382         if (realpath("/proc/self/exe", argv0_canon) == NULL) {
 383                 log_perror(argv[0]);
 384                 exit(1);
 385         }
 386         if (realpath(config_filename.c_str(), config_filename_canon) == NULL) {
 387                 log_perror(config_filename.c_str());
 388                 exit(1);
 389         }
 390
 391         // Now parse the configuration file.
 392         Config config;
 393         if (!parse_config(config_filename_canon, &config)) {
 394                 exit(1);
 395         }
 396         if (test_config) {
 397                 exit(0);
 398         }
 399
 400         // Ideally we'd like to daemonize only when we've started up all threads etc.,
 401         // but daemon() forks, which is not good in multithreaded software, so we'll
 402         // have to do it here.
 403         if (config.daemonize) {
 404                 if (daemon(0, 0) == -1) {
 405                         log_perror("daemon");
 406                         exit(1);
 407                 }
 408         }
 409
 410 start:
 411         // Open logs as soon as possible.
 412         open_logs(config.log_destinations);
 413
 414         log(INFO, "Cubemap " SERVER_VERSION " starting.");
 415         if (config.access_log_file.empty()) {
 416                 // Create a dummy logger.
 417                 access_log = new AccessLogThread();
 418         } else {
 419                 access_log = new AccessLogThread(config.access_log_file);
 420         }
 421         access_log->run();
 422
 423         servers = new ServerPool(config.num_servers);
 424
 425         // Find all the streams that are to be deleted.
 426         set<string> deleted_urls;
 427         find_deleted_streams(config, &deleted_urls);
 428
 429         CubemapStateProto loaded_state;
 430         timespec serialize_start;
 431         set<string> deserialized_urls;
 432         map<AcceptorConfig, Acceptor *, AcceptorConfigCompare> deserialized_acceptors;
 433         multimap<InputKey, InputWithRefcount> inputs;  // multimap due to older versions without deduplication.
 434         if (state_fd != -1) {
 435                 log(INFO, "Deserializing state from previous process...");
 436                 string serialized;
 437                 if (!read_tempfile_and_close(state_fd, &serialized)) {
 438                         exit(1);
 439                 }
 440                 if (!loaded_state.ParseFromString(serialized)) {
 441                         log(ERROR, "Failed deserialization of state.");
 442                         exit(1);
 443                 }
 444
 445                 serialize_start.tv_sec = loaded_state.serialize_start_sec();
 446                 serialize_start.tv_nsec = loaded_state.serialize_start_usec() * 1000ull;
 447
 448                 // Deserialize the streams.
 449                 map<string, string> stream_headers_for_url;  // See below.
 450                 for (int i = 0; i < loaded_state.streams_size(); ++i) {
 451                         const StreamProto &stream = loaded_state.streams(i);
 452
 453                         if (deleted_urls.count(stream.url()) != 0) {
 454                                 // Delete the stream backlogs.
 455                                 for (int j = 0; j < stream.data_fds_size(); ++j) {
 456                                         safe_close(stream.data_fds(j));
 457                                 }
 458                         } else {
 459                                 vector<int> data_fds;
 460                                 for (int j = 0; j < stream.data_fds_size(); ++j) {
 461                                         data_fds.push_back(stream.data_fds(j));
 462                                 }
 463
 464                                 servers->add_stream_from_serialized(stream, data_fds);
 465                                 deserialized_urls.insert(stream.url());
 466
 467                                 stream_headers_for_url.insert(make_pair(stream.url(), stream.stream_header()));
 468                         }
 469                 }
 470
 471                 // Deserialize the inputs. Note that we don't actually add them to any stream yet.
 472                 for (int i = 0; i < loaded_state.inputs_size(); ++i) {
 473                         InputProto serialized_input = loaded_state.inputs(i);
 474
 475                         InputWithRefcount iwr;
 476                         iwr.input = create_input(serialized_input);
 477                         iwr.refcount = 0;
 478
 479                         Input::Encoding src_encoding = serialized_input.is_metacube_encoded() ?
 480                                 Input::INPUT_ENCODING_METACUBE :
 481                                 Input::INPUT_ENCODING_RAW;
 482                         InputKey key(serialized_input.url(), src_encoding);
 483                         inputs.insert(make_pair(key, iwr));
 484                 }
 485
 486                 // Deserialize the acceptors.
 487                 for (int i = 0; i < loaded_state.acceptors_size(); ++i) {
 488                         AcceptorConfig config;
 489                         config.addr = extract_address_from_acceptor_proto(loaded_state.acceptors(i));
 490                         config.certificate_chain = loaded_state.acceptors(i).certificate_chain();
 491                         config.private_key = loaded_state.acceptors(i).private_key();
 492                         deserialized_acceptors.insert(make_pair(
 493                                 config,
 494                                 new Acceptor(loaded_state.acceptors(i))));
 495                 }
 496
 497                 log(INFO, "Deserialization done.");
 498         }
 499
 500         // Add any new inputs coming from the config.
 501         create_config_inputs(config, &inputs);
 502
 503         // Find all streams in the configuration file, create them, and connect to the inputs.
 504         create_streams(config, deserialized_urls, &inputs);
 505         vector<Acceptor *> acceptors = create_acceptors(config, &deserialized_acceptors);
 506
 507         // Make all the servers create TLS contexts for every TLS keypair we have.
 508         for (Acceptor *acceptor : acceptors) {
 509                 if (acceptor->is_tls()) {
 510                         servers->create_tls_context_for_acceptor(acceptor);
 511                 }
 512         }
 513
 514         // Put back the existing clients. It doesn't matter which server we
 515         // allocate them to, so just do round-robin. However, we need to sort them
 516         // by connection time first, since add_client_serialized() expects that.
 517         sort(loaded_state.mutable_clients()->begin(),
 518              loaded_state.mutable_clients()->end(),
 519              OrderByConnectionTime());
 520         for (int i = 0; i < loaded_state.clients_size(); ++i) {
 521                 if (deleted_urls.count(loaded_state.clients(i).url()) != 0) {
 522                         safe_close(loaded_state.clients(i).sock());
 523                 } else {
 524                         servers->add_client_from_serialized(loaded_state.clients(i));
 525                 }
 526         }
 527
 528         servers->run();
 529
 530         // Now delete all inputs that are longer in use, and start the others.
 531         for (multimap<InputKey, InputWithRefcount>::iterator input_it = inputs.begin();
 532              input_it != inputs.end(); ) {
 533                 if (input_it->second.refcount == 0) {
 534                         if (input_it->first.second == Input::INPUT_ENCODING_RAW) {
 535                                 log(WARNING, "Raw input '%s' no longer in use, closing.",
 536                                     input_it->first.first.c_str());
 537                         } else {
 538                                 assert(input_it->first.second == Input::INPUT_ENCODING_METACUBE);
 539                                 log(WARNING, "Metacube input '%s' no longer in use, closing.",
 540                                     input_it->first.first.c_str());
 541                         }
 542                         input_it->second.input->close_socket();
 543                         delete input_it->second.input;
 544                         inputs.erase(input_it++);
 545                 } else {
 546                         input_it->second.input->run();
 547                         ++input_it;
 548                 }
 549         }
 550
 551         // Start writing statistics.
 552         StatsThread *stats_thread = NULL;
 553         if (!config.stats_file.empty()) {
 554                 stats_thread = new StatsThread(config.stats_file, config.stats_interval);
 555                 stats_thread->run();
 556         }
 557
 558         InputStatsThread *input_stats_thread = NULL;
 559         if (!config.input_stats_file.empty()) {
 560                 vector<Input*> inputs_no_refcount;
 561                 for (multimap<InputKey, InputWithRefcount>::iterator input_it = inputs.begin();
 562                      input_it != inputs.end(); ++input_it) {
 563                         inputs_no_refcount.push_back(input_it->second.input);
 564                 }
 565
 566                 input_stats_thread = new InputStatsThread(config.input_stats_file, config.input_stats_interval, inputs_no_refcount);
 567                 input_stats_thread->run();
 568         }
 569
 570         timespec server_start;
 571         int err = clock_gettime(CLOCK_MONOTONIC, &server_start);
 572         assert(err != -1);
 573         if (state_fd != -1) {
 574                 // Measure time from we started deserializing (below) to now, when basically everything
 575                 // is up and running. This is, in other words, a conservative estimate of how long our
 576                 // “glitch” period was, not counting of course reconnects if the configuration changed.
 577                 double glitch_time = server_start.tv_sec - serialize_start.tv_sec +
 578                         1e-9 * (server_start.tv_nsec - serialize_start.tv_nsec);
 579                 log(INFO, "Re-exec happened in approx. %.0f ms.", glitch_time * 1000.0);
 580         }
 581
 582         sd_notify(0, "READY=1");
 583
 584         while (!hupped) {
 585                 usleep(100000);
 586         }
 587
 588         if (stopped) {
 589                 sd_notify(0, "STOPPING=1");
 590         } else {
 591                 sd_notify(0, "RELOADING=1");
 592         }
 593
 594         // OK, we've been HUPed. Time to shut down everything, serialize, and re-exec.
 595         err = clock_gettime(CLOCK_MONOTONIC, &serialize_start);
 596         assert(err != -1);
 597
 598         if (input_stats_thread != NULL) {
 599                 input_stats_thread->stop();
 600                 delete input_stats_thread;
 601         }
 602         if (stats_thread != NULL) {
 603                 stats_thread->stop();
 604                 delete stats_thread;
 605         }
 606         for (size_t i = 0; i < acceptors.size(); ++i) {
 607                 acceptors[i]->stop();
 608         }
 609         for (multimap<InputKey, InputWithRefcount>::iterator input_it = inputs.begin();
 610              input_it != inputs.end();
 611              ++input_it) {
 612                 input_it->second.input->stop();
 613         }
 614         servers->stop();
 615
 616         CubemapStateProto state;
 617         if (stopped) {
 618                 log(INFO, "Shutting down.");
 619         } else {
 620                 log(INFO, "Serializing state and re-execing...");
 621                 state = collect_state(
 622                         serialize_start, acceptors, inputs, servers);
 623                 string serialized;
 624                 state.SerializeToString(&serialized);
 625                 state_fd = make_tempfile(serialized);
 626                 if (state_fd == -1) {
 627                         exit(1);
 628                 }
 629         }
 630         delete servers;
 631
 632         access_log->stop();
 633         delete access_log;
 634         shut_down_logging();
 635
 636         if (stopped) {
 637                 exit(0);
 638         }
 639
 640         // OK, so the signal was SIGHUP. Check that the new config is okay, then exec the new binary.
 641         if (!dry_run_config(argv0_canon, config_filename_canon)) {
 642                 open_logs(config.log_destinations);
 643                 log(ERROR, "%s --test-config failed. Restarting old version instead of new.", argv[0]);
 644                 hupped = false;
 645                 shut_down_logging();
 646                 goto start;
 647         }
 648
 649         char buf[16];
 650         sprintf(buf, "%d", state_fd);
 651
 652         for ( ;; ) {
 653                 execlp(argv0_canon, argv0_canon, config_filename_canon, "--state", buf, NULL);
 654                 open_logs(config.log_destinations);
 655                 log_perror("execlp");
 656                 log(ERROR, "re-exec of %s failed. Waiting 0.2 seconds and trying again...", argv0_canon);
 657                 shut_down_logging();
 658                 usleep(200000);
 659         }
 660 }