socket.c

   1 /*-*- Mode: C; c-basic-offset: 8 -*-*/
   2
   3 #include <sys/types.h>
   4 #include <sys/stat.h>
   5 #include <unistd.h>
   6 #include <errno.h>
   7 #include <fcntl.h>
   8 #include <sys/poll.h>
   9 #include <signal.h>
  10
  11 #include "name.h"
  12 #include "socket.h"
  13 #include "log.h"
  14
  15 static const NameActiveState state_table[_SOCKET_STATE_MAX] = {
  16         [SOCKET_DEAD] = NAME_INACTIVE,
  17         [SOCKET_START_PRE] = NAME_ACTIVATING,
  18         [SOCKET_START_POST] = NAME_ACTIVATING,
  19         [SOCKET_LISTENING] = NAME_ACTIVE,
  20         [SOCKET_RUNNING] = NAME_ACTIVE,
  21         [SOCKET_STOP_PRE] = NAME_DEACTIVATING,
  22         [SOCKET_STOP_PRE_SIGTERM] = NAME_DEACTIVATING,
  23         [SOCKET_STOP_PRE_SIGKILL] = NAME_DEACTIVATING,
  24         [SOCKET_STOP_POST] = NAME_DEACTIVATING,
  25         [SOCKET_STOP_POST_SIGTERM] = NAME_DEACTIVATING,
  26         [SOCKET_STOP_POST_SIGKILL] = NAME_DEACTIVATING,
  27         [SOCKET_MAINTAINANCE] = NAME_INACTIVE,
  28 };
  29
  30 static void socket_done(Name *n) {
  31         Socket *s = SOCKET(n);
  32         SocketPort *p;
  33
  34         assert(s);
  35
  36         while ((p = s->ports)) {
  37                 LIST_REMOVE(SocketPort, port, s->ports, p);
  38
  39                 if (p->fd >= 0)
  40                         close_nointr(p->fd);
  41                 free(p->path);
  42                 free(p);
  43         }
  44
  45         exec_context_done(&s->exec_context);
  46         exec_command_free_array(s->exec_command, _SOCKET_EXEC_MAX);
  47         s->control_command = NULL;
  48
  49         if (s->control_pid > 0) {
  50                 name_unwatch_pid(n, s->control_pid);
  51                 s->control_pid = 0;
  52         }
  53
  54         s->service = NULL;
  55
  56         name_unwatch_timer(n, &s->timer_id);
  57 }
  58
  59 static int socket_init(Name *n) {
  60         Socket *s = SOCKET(n);
  61         char *t;
  62         int r;
  63
  64         /* First, reset everything to the defaults, in case this is a
  65          * reload */
  66
  67         s->state = 0;
  68         s->timer_id = -1;
  69         s->bind_ipv6_only = false;
  70         s->backlog = SOMAXCONN;
  71         s->timeout_usec = DEFAULT_TIMEOUT_USEC;
  72         exec_context_init(&s->exec_context);
  73
  74         if ((r = name_load_fragment_and_dropin(n)) < 0)
  75                 goto fail;
  76
  77         if (!(t = name_change_suffix(name_id(n), ".service"))) {
  78                 r = -ENOMEM;
  79                 goto fail;
  80         }
  81
  82         r = manager_load_name(n->meta.manager, t, (Name**) &s->service);
  83         free(t);
  84
  85         if (r < 0)
  86                 goto fail;
  87
  88         if ((r = name_add_dependency(n, NAME_BEFORE, NAME(s->service))) < 0)
  89                 goto fail;
  90
  91         return 0;
  92
  93 fail:
  94         socket_done(n);
  95         return r;
  96 }
  97
  98 static const char* listen_lookup(int type) {
  99
 100         if (type == SOCK_STREAM)
 101                 return "ListenStream";
 102         else if (type == SOCK_DGRAM)
 103                 return "ListenDatagram";
 104         else if (type == SOCK_SEQPACKET)
 105                 return "ListenSequentialPacket";
 106
 107         assert_not_reached("Unknown socket type");
 108         return NULL;
 109 }
 110
 111 static void socket_dump(Name *n, FILE *f, const char *prefix) {
 112
 113         static const char* const state_table[_SOCKET_STATE_MAX] = {
 114                 [SOCKET_DEAD] = "dead",
 115                 [SOCKET_START_PRE] = "start-pre",
 116                 [SOCKET_START_POST] = "start-post",
 117                 [SOCKET_LISTENING] = "listening",
 118                 [SOCKET_RUNNING] = "running",
 119                 [SOCKET_STOP_PRE] = "stop-pre",
 120                 [SOCKET_STOP_PRE_SIGTERM] = "stop-pre-sigterm",
 121                 [SOCKET_STOP_PRE_SIGKILL] = "stop-pre-sigkill",
 122                 [SOCKET_STOP_POST] = "stop-post",
 123                 [SOCKET_STOP_POST_SIGTERM] = "stop-post-sigterm",
 124                 [SOCKET_STOP_POST_SIGKILL] = "stop-post-sigkill",
 125                 [SOCKET_MAINTAINANCE] = "maintainance"
 126         };
 127
 128         static const char* const command_table[_SOCKET_EXEC_MAX] = {
 129                 [SOCKET_EXEC_START_PRE] = "StartPre",
 130                 [SOCKET_EXEC_START_POST] = "StartPost",
 131                 [SOCKET_EXEC_STOP_PRE] = "StopPre",
 132                 [SOCKET_EXEC_STOP_POST] = "StopPost"
 133         };
 134
 135         SocketExecCommand c;
 136         Socket *s = SOCKET(n);
 137         SocketPort *p;
 138
 139         assert(s);
 140
 141         fprintf(f,
 142                 "%sSocket State: %s\n"
 143                 "%sBindIPv6Only: %s\n"
 144                 "%sBacklog: %u\n",
 145                 prefix, state_table[s->state],
 146                 prefix, yes_no(s->bind_ipv6_only),
 147                 prefix, s->backlog);
 148
 149         LIST_FOREACH(port, p, s->ports) {
 150
 151                 if (p->type == SOCKET_SOCKET) {
 152                         const char *t;
 153                         int r;
 154                         char *k;
 155
 156                         if ((r = socket_address_print(&p->address, &k)) < 0)
 157                                 t = strerror(-r);
 158                         else
 159                                 t = k;
 160
 161                         fprintf(f, "%s%s: %s\n", prefix, listen_lookup(p->address.type), k);
 162                         free(k);
 163                 } else
 164                         fprintf(f, "%sListenFIFO: %s\n", prefix, p->path);
 165         }
 166
 167         exec_context_dump(&s->exec_context, f, prefix);
 168
 169         for (c = 0; c < _SOCKET_EXEC_MAX; c++) {
 170                 ExecCommand *i;
 171
 172                 LIST_FOREACH(command, i, s->exec_command[c])
 173                         fprintf(f, "%s%s: %s\n", prefix, command_table[c], i->path);
 174         }
 175 }
 176
 177 static void socket_close_fds(Socket *s) {
 178         SocketPort *p;
 179
 180         assert(s);
 181
 182         LIST_FOREACH(port, p, s->ports) {
 183                 if (p->fd < 0)
 184                         continue;
 185
 186                 name_unwatch_fd(NAME(s), p->fd);
 187                 assert_se(close_nointr(p->fd) >= 0);
 188
 189                 p->fd = -1;
 190         }
 191 }
 192
 193 static int socket_open_fds(Socket *s) {
 194         SocketPort *p;
 195         int r;
 196
 197         assert(s);
 198
 199         LIST_FOREACH(port, p, s->ports) {
 200
 201                 if (p->fd >= 0)
 202                         continue;
 203
 204                 if (p->type == SOCKET_SOCKET) {
 205
 206                         if ((r = socket_address_listen(&p->address, s->backlog, s->bind_ipv6_only, &p->fd)) < 0)
 207                                 goto rollback;
 208
 209                 } else {
 210                         struct stat st;
 211                         assert(p->type == SOCKET_FIFO);
 212
 213                         if (mkfifo(p->path, 0666 & ~s->exec_context.umask) < 0 && errno != EEXIST) {
 214                                 r = -errno;
 215                                 goto rollback;
 216                         }
 217
 218                         if ((p->fd = open(p->path, O_RDWR|O_CLOEXEC|O_NOCTTY|O_NONBLOCK|O_NOFOLLOW)) < 0) {
 219                                 r = -errno;
 220                                 goto rollback;
 221                         }
 222
 223                         if (fstat(p->fd, &st) < 0) {
 224                                 r = -errno;
 225                                 goto rollback;
 226                         }
 227
 228                         /* FIXME verify user, access mode */
 229
 230                         if (!S_ISFIFO(st.st_mode)) {
 231                                 r = -EEXIST;
 232                                 goto rollback;
 233                         }
 234                 }
 235         }
 236
 237         return 0;
 238
 239 rollback:
 240         socket_close_fds(s);
 241         return r;
 242 }
 243
 244 static void socket_unwatch_fds(Socket *s) {
 245         SocketPort *p;
 246
 247         assert(s);
 248
 249         LIST_FOREACH(port, p, s->ports) {
 250                 if (p->fd < 0)
 251                         continue;
 252
 253                 name_unwatch_fd(NAME(s), p->fd);
 254         }
 255 }
 256
 257 static int socket_watch_fds(Socket *s) {
 258         SocketPort *p;
 259         int r;
 260
 261         assert(s);
 262
 263         LIST_FOREACH(port, p, s->ports) {
 264                 if (p->fd < 0)
 265                         continue;
 266
 267                 if ((r = name_watch_fd(NAME(s), p->fd, POLLIN)) < 0)
 268                         goto fail;
 269         }
 270
 271         return 0;
 272
 273 fail:
 274         socket_unwatch_fds(s);
 275         return r;
 276 }
 277
 278 static void socket_set_state(Socket *s, SocketState state) {
 279         SocketState old_state;
 280         assert(s);
 281
 282         old_state = s->state;
 283         s->state = state;
 284
 285         if (state != SOCKET_START_PRE &&
 286             state != SOCKET_START_POST &&
 287             state != SOCKET_STOP_PRE &&
 288             state != SOCKET_STOP_PRE_SIGTERM &&
 289             state != SOCKET_STOP_PRE_SIGKILL &&
 290             state != SOCKET_STOP_POST &&
 291             state != SOCKET_STOP_POST_SIGTERM &&
 292             state != SOCKET_STOP_POST_SIGKILL)
 293                 name_unwatch_timer(NAME(s), &s->timer_id);
 294
 295         if (state != SOCKET_START_PRE &&
 296             state != SOCKET_START_POST &&
 297             state != SOCKET_STOP_PRE &&
 298             state != SOCKET_STOP_PRE_SIGTERM &&
 299             state != SOCKET_STOP_PRE_SIGKILL &&
 300             state != SOCKET_STOP_POST &&
 301             state != SOCKET_STOP_POST_SIGTERM &&
 302             state != SOCKET_STOP_POST_SIGKILL)
 303                 if (s->control_pid >= 0) {
 304                         name_unwatch_pid(NAME(s), s->control_pid);
 305                         s->control_pid = 0;
 306                 }
 307
 308         if (state != SOCKET_START_PRE &&
 309             state != SOCKET_START_POST &&
 310             state != SOCKET_STOP_PRE &&
 311             state != SOCKET_STOP_POST)
 312                 s->control_command = NULL;
 313
 314         if (state != SOCKET_START_POST &&
 315             state != SOCKET_LISTENING &&
 316             state != SOCKET_RUNNING &&
 317             state != SOCKET_STOP_PRE &&
 318             state != SOCKET_STOP_PRE_SIGTERM &&
 319             state != SOCKET_STOP_PRE_SIGKILL)
 320                 socket_close_fds(s);
 321
 322         if (state != SOCKET_LISTENING)
 323                 socket_unwatch_fds(s);
 324
 325         name_notify(NAME(s), state_table[old_state], state_table[s->state]);
 326 }
 327
 328 static int socket_spawn(Socket *s, ExecCommand *c, bool timeout, pid_t *_pid) {
 329         pid_t pid;
 330         int r;
 331
 332         assert(s);
 333         assert(c);
 334         assert(_pid);
 335
 336         if (timeout) {
 337                 if ((r = name_watch_timer(NAME(s), s->timeout_usec, &s->timer_id)) < 0)
 338                         goto fail;
 339         } else
 340                 name_unwatch_timer(NAME(s), &s->timer_id);
 341
 342         if ((r = exec_spawn(c, &s->exec_context, NULL, 0, &pid)) < 0)
 343                 goto fail;
 344
 345         if ((r = name_watch_pid(NAME(s), pid)) < 0)
 346                 /* FIXME: we need to do something here */
 347                 goto fail;
 348
 349         *_pid = pid;
 350
 351         return 0;
 352
 353 fail:
 354         if (timeout)
 355                 name_unwatch_timer(NAME(s), &s->timer_id);
 356
 357         return r;
 358 }
 359
 360 static void socket_enter_dead(Socket *s, bool success) {
 361         assert(s);
 362
 363         if (!success)
 364                 s->failure = true;
 365
 366         socket_set_state(s, s->failure ? SOCKET_MAINTAINANCE : SOCKET_DEAD);
 367 }
 368
 369 static void socket_enter_stop_post(Socket *s, bool success) {
 370         int r;
 371         assert(s);
 372
 373         if (!success)
 374                 s->failure = true;
 375
 376         if ((s->control_command = s->exec_command[SOCKET_EXEC_STOP_POST])) {
 377
 378                 if ((r = socket_spawn(s, s->control_command, true, &s->control_pid)) < 0)
 379                         goto fail;
 380
 381                 socket_set_state(s, SOCKET_STOP_POST);
 382         } else
 383                 socket_enter_dead(s, true);
 384
 385         return;
 386
 387 fail:
 388         log_warning("%s failed to run stop-post executable: %s", name_id(NAME(s)), strerror(-r));
 389         socket_enter_dead(s, false);
 390 }
 391
 392 static void socket_enter_signal(Socket *s, SocketState state, bool success) {
 393         int r;
 394
 395         assert(s);
 396
 397         if (!success)
 398                 s->failure = true;
 399
 400         if (s->control_pid > 0) {
 401                 int sig;
 402
 403                 sig = (state == SOCKET_STOP_PRE_SIGTERM || state == SOCKET_STOP_POST_SIGTERM) ? SIGTERM : SIGKILL;
 404
 405                 if (kill(s->control_pid, sig) < 0 && errno != ESRCH) {
 406                         r = -errno;
 407                         goto fail;
 408                 }
 409
 410                 socket_set_state(s, state);
 411         } else
 412                 socket_enter_dead(s, true);
 413
 414         return;
 415
 416 fail:
 417         log_warning("%s failed to kill processes: %s", name_id(NAME(s)), strerror(-r));
 418
 419         if (state == SOCKET_STOP_PRE_SIGTERM || state == SOCKET_STOP_PRE_SIGKILL)
 420                 socket_enter_stop_post(s, false);
 421         else
 422                 socket_enter_dead(s, false);
 423 }
 424
 425 static void socket_enter_stop_pre(Socket *s, bool success) {
 426         int r;
 427         assert(s);
 428
 429         if (!success)
 430                 s->failure = true;
 431
 432         if ((s->control_command = s->exec_command[SOCKET_EXEC_STOP_PRE])) {
 433
 434                 if ((r = socket_spawn(s, s->control_command, true, &s->control_pid)) < 0)
 435                         goto fail;
 436
 437                 socket_set_state(s, SOCKET_STOP_PRE);
 438         } else
 439                 socket_enter_stop_post(s, true);
 440
 441         return;
 442
 443 fail:
 444         log_warning("%s failed to run stop-pre executable: %s", name_id(NAME(s)), strerror(-r));
 445         socket_enter_stop_post(s, false);
 446 }
 447
 448 static void socket_enter_start_post(Socket *s) {
 449         int r;
 450         assert(s);
 451
 452         if ((r = socket_open_fds(s)) < 0 ||
 453             (r = socket_watch_fds(s)) < 0) {
 454                 log_warning("%s failed to listen on sockets: %s", name_id(NAME(s)), strerror(-r));
 455                 goto fail;
 456         }
 457
 458         if ((s->control_command = s->exec_command[SOCKET_EXEC_START_POST])) {
 459
 460                 if ((r = socket_spawn(s, s->control_command, true, &s->control_pid)) < 0) {
 461                         log_warning("%s failed to run start-post executable: %s", name_id(NAME(s)), strerror(-r));
 462                         goto fail;
 463                 }
 464
 465                 socket_set_state(s, SOCKET_START_POST);
 466         } else
 467                 socket_set_state(s, SOCKET_LISTENING);
 468
 469         return;
 470
 471 fail:
 472         socket_enter_stop_pre(s, false);
 473 }
 474
 475 static void socket_enter_start_pre(Socket *s) {
 476         int r;
 477         assert(s);
 478
 479         if ((s->control_command = s->exec_command[SOCKET_EXEC_START_PRE])) {
 480
 481                 if ((r = socket_spawn(s, s->control_command, true, &s->control_pid)) < 0)
 482                         goto fail;
 483
 484                 socket_set_state(s, SOCKET_START_PRE);
 485         } else
 486                 socket_enter_start_post(s);
 487
 488         return;
 489
 490 fail:
 491         log_warning("%s failed to run start-pre exectuable: %s", name_id(NAME(s)), strerror(-r));
 492         socket_enter_dead(s, false);
 493 }
 494
 495 static void socket_enter_running(Socket *s) {
 496         int r;
 497
 498         assert(s);
 499
 500         if ((r = manager_add_job(NAME(s)->meta.manager, JOB_START, NAME(s->service), JOB_REPLACE, true, NULL)) < 0)
 501                 goto fail;
 502
 503         socket_set_state(s, SOCKET_RUNNING);
 504         return;
 505
 506 fail:
 507         log_warning("%s failed to queue socket startup job: %s", name_id(NAME(s)), strerror(-r));
 508         socket_enter_dead(s, false);
 509 }
 510
 511 static void socket_run_next(Socket *s, bool success) {
 512         int r;
 513
 514         assert(s);
 515         assert(s->control_command);
 516         assert(s->control_command->command_next);
 517
 518         if (!success)
 519                 s->failure = true;
 520
 521         s->control_command = s->control_command->command_next;
 522
 523         if ((r = socket_spawn(s, s->control_command, true, &s->control_pid)) < 0)
 524                 goto fail;
 525
 526         return;
 527
 528 fail:
 529         if (s->state == SOCKET_STOP_PRE)
 530                 socket_enter_stop_post(s, false);
 531         else if (s->state == SOCKET_STOP_POST)
 532                 socket_enter_dead(s, false);
 533         else
 534                 socket_enter_stop_pre(s, false);
 535 }
 536
 537 static int socket_start(Name *n) {
 538         Socket *s = SOCKET(n);
 539
 540         assert(s);
 541
 542         /* We cannot fulfill this request right now, try again later
 543          * please! */
 544         if (s->state == SOCKET_STOP_PRE ||
 545             s->state == SOCKET_STOP_PRE_SIGKILL ||
 546             s->state == SOCKET_STOP_PRE_SIGTERM ||
 547             s->state == SOCKET_STOP_POST ||
 548             s->state == SOCKET_STOP_POST_SIGTERM ||
 549             s->state == SOCKET_STOP_POST_SIGKILL)
 550                 return -EAGAIN;
 551
 552         if (s->state == SOCKET_START_PRE ||
 553             s->state == SOCKET_START_POST)
 554                 return 0;
 555
 556         /* Cannot run this without the service being around */
 557         if (s->service->meta.load_state != NAME_LOADED)
 558                 return -ENOENT;
 559
 560         assert(s->state == SOCKET_DEAD || s->state == SOCKET_MAINTAINANCE);
 561
 562         s->failure = false;
 563         socket_enter_start_pre(s);
 564         return 0;
 565 }
 566
 567 static int socket_stop(Name *n) {
 568         Socket *s = SOCKET(n);
 569
 570         assert(s);
 571
 572         /* We cannot fulfill this request right now, try again later
 573          * please! */
 574         if (s->state == SOCKET_START_PRE ||
 575             s->state == SOCKET_START_POST)
 576                 return -EAGAIN;
 577
 578         assert(s->state == SOCKET_LISTENING || s->state == SOCKET_RUNNING);
 579
 580         socket_enter_stop_pre(s, true);
 581         return 0;
 582 }
 583
 584 static NameActiveState socket_active_state(Name *n) {
 585         assert(n);
 586
 587         return state_table[SOCKET(n)->state];
 588 }
 589
 590 static void socket_fd_event(Name *n, int fd, uint32_t events) {
 591         Socket *s = SOCKET(n);
 592
 593         assert(s);
 594
 595         log_info("Incoming traffic on %s", name_id(n));
 596
 597         if (events != POLLIN)
 598                 socket_enter_stop_pre(s, false);
 599
 600         socket_enter_running(s);
 601 }
 602
 603 static void socket_sigchld_event(Name *n, pid_t pid, int code, int status) {
 604         Socket *s = SOCKET(n);
 605         bool success;
 606
 607         assert(s);
 608         assert(pid >= 0);
 609
 610         success = code == CLD_EXITED || status == 0;
 611         s->failure = s->failure || !success;
 612
 613         assert(s->control_pid == pid);
 614         assert(s->control_command);
 615
 616         exec_status_fill(&s->control_command->exec_status, pid, code, status);
 617         s->control_pid = 0;
 618
 619         log_debug("%s: control process exited, code=%s status=%i", name_id(n), sigchld_code(code), status);
 620
 621         if (s->control_command->command_next &&
 622             (success || (s->state == SOCKET_EXEC_STOP_PRE || s->state == SOCKET_EXEC_STOP_POST)))
 623                 socket_run_next(s, success);
 624         else {
 625                 /* No further commands for this step, so let's figure
 626                  * out what to do next */
 627
 628                 switch (s->state) {
 629
 630                 case SOCKET_START_PRE:
 631                         if (success)
 632                                 socket_enter_start_pre(s);
 633                         else
 634                                 socket_enter_stop_pre(s, false);
 635                         break;
 636
 637                 case SOCKET_START_POST:
 638                         if (success)
 639                                 socket_set_state(s, SOCKET_LISTENING);
 640                         else
 641                                 socket_enter_stop_pre(s, false);
 642                         break;
 643
 644                 case SOCKET_STOP_PRE:
 645                 case SOCKET_STOP_PRE_SIGTERM:
 646                 case SOCKET_STOP_PRE_SIGKILL:
 647                         socket_enter_stop_post(s, success);
 648                         break;
 649
 650                 case SOCKET_STOP_POST:
 651                 case SOCKET_STOP_POST_SIGTERM:
 652                 case SOCKET_STOP_POST_SIGKILL:
 653                         socket_enter_dead(s, success);
 654                         break;
 655
 656                 default:
 657                         assert_not_reached("Uh, control process died at wrong time.");
 658                 }
 659         }
 660 }
 661
 662 static void socket_timer_event(Name *n, int id, uint64_t elapsed) {
 663         Socket *s = SOCKET(n);
 664
 665         assert(s);
 666         assert(elapsed == 1);
 667
 668         assert(s->timer_id == id);
 669
 670         switch (s->state) {
 671
 672         case SOCKET_START_PRE:
 673         case SOCKET_START_POST:
 674                 log_warning("%s operation timed out. Stopping.", name_id(n));
 675                 socket_enter_stop_pre(s, false);
 676                 break;
 677
 678         case SOCKET_STOP_PRE:
 679                 log_warning("%s stopping timed out. Terminating.", name_id(n));
 680                 socket_enter_signal(s, SOCKET_STOP_PRE_SIGTERM, false);
 681                 break;
 682
 683         case SOCKET_STOP_PRE_SIGTERM:
 684                 log_warning("%s stopping timed out. Killing.", name_id(n));
 685                 socket_enter_signal(s, SOCKET_STOP_PRE_SIGKILL, false);
 686                 break;
 687
 688         case SOCKET_STOP_PRE_SIGKILL:
 689                 log_warning("%s still around after SIGKILL. Ignoring.", name_id(n));
 690                 socket_enter_stop_post(s, false);
 691                 break;
 692
 693         case SOCKET_STOP_POST:
 694                 log_warning("%s stopping timed out (2). Terminating.", name_id(n));
 695                 socket_enter_signal(s, SOCKET_STOP_POST_SIGTERM, false);
 696                 break;
 697
 698         case SOCKET_STOP_POST_SIGTERM:
 699                 log_warning("%s stopping timed out (2). Killing.", name_id(n));
 700                 socket_enter_signal(s, SOCKET_STOP_POST_SIGKILL, false);
 701                 break;
 702
 703         case SOCKET_STOP_POST_SIGKILL:
 704                 log_warning("%s still around after SIGKILL (2). Entering maintainance mode.", name_id(n));
 705                 socket_enter_dead(s, false);
 706                 break;
 707
 708         default:
 709                 assert_not_reached("Timeout at wrong time.");
 710         }
 711 }
 712
 713 int socket_collect_fds(Socket *s, int **fds, unsigned *n_fds) {
 714         int *rfds;
 715         unsigned rn_fds, k;
 716         SocketPort *p;
 717
 718         assert(s);
 719         assert(fds);
 720         assert(n_fds);
 721
 722         /* Called from the service code for requesting our fds */
 723
 724         rn_fds = 0;
 725         LIST_FOREACH(port, p, s->ports)
 726                 if (p->fd >= 0)
 727                         rn_fds++;
 728
 729         if (!(rfds = new(int, rn_fds)) < 0)
 730                 return -ENOMEM;
 731
 732         k = 0;
 733         LIST_FOREACH(port, p, s->ports)
 734                 if (p->fd >= 0)
 735                         rfds[k++] = p->fd;
 736
 737         assert(k == rn_fds);
 738
 739         *fds = rfds;
 740         *n_fds = rn_fds;
 741
 742         return 0;
 743 }
 744
 745 const NameVTable socket_vtable = {
 746         .suffix = ".socket",
 747
 748         .init = socket_init,
 749         .done = socket_done,
 750
 751         .dump = socket_dump,
 752
 753         .start = socket_start,
 754         .stop = socket_stop,
 755
 756         .active_state = socket_active_state,
 757
 758         .fd_event = socket_fd_event,
 759         .sigchld_event = socket_sigchld_event,
 760         .timer_event = socket_timer_event
 761 };