socket.c

   1 /*-*- Mode: C; c-basic-offset: 8 -*-*/
   2
   3 /***
   4   This file is part of systemd.
   5
   6   Copyright 2010 Lennart Poettering
   7
   8   systemd is free software; you can redistribute it and/or modify it
   9   under the terms of the GNU General Public License as published by
  10   the Free Software Foundation; either version 2 of the License, or
  11   (at your option) any later version.
  12
  13   systemd is distributed in the hope that it will be useful, but
  14   WITHOUT ANY WARRANTY; without even the implied warranty of
  15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  16   General Public License for more details.
  17
  18   You should have received a copy of the GNU General Public License
  19   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  20 ***/
  21
  22 #include <sys/types.h>
  23 #include <sys/stat.h>
  24 #include <unistd.h>
  25 #include <errno.h>
  26 #include <fcntl.h>
  27 #include <sys/epoll.h>
  28 #include <signal.h>
  29
  30 #include "unit.h"
  31 #include "socket.h"
  32 #include "log.h"
  33 #include "load-dropin.h"
  34 #include "load-fragment.h"
  35
  36 static const UnitActiveState state_translation_table[_SOCKET_STATE_MAX] = {
  37         [SOCKET_DEAD] = UNIT_INACTIVE,
  38         [SOCKET_START_PRE] = UNIT_ACTIVATING,
  39         [SOCKET_START_POST] = UNIT_ACTIVATING,
  40         [SOCKET_LISTENING] = UNIT_ACTIVE,
  41         [SOCKET_RUNNING] = UNIT_ACTIVE,
  42         [SOCKET_STOP_PRE] = UNIT_DEACTIVATING,
  43         [SOCKET_STOP_PRE_SIGTERM] = UNIT_DEACTIVATING,
  44         [SOCKET_STOP_PRE_SIGKILL] = UNIT_DEACTIVATING,
  45         [SOCKET_STOP_POST] = UNIT_DEACTIVATING,
  46         [SOCKET_STOP_POST_SIGTERM] = UNIT_DEACTIVATING,
  47         [SOCKET_STOP_POST_SIGKILL] = UNIT_DEACTIVATING,
  48         [SOCKET_MAINTAINANCE] = UNIT_INACTIVE,
  49 };
  50
  51 static const char* const state_string_table[_SOCKET_STATE_MAX] = {
  52         [SOCKET_DEAD] = "dead",
  53         [SOCKET_START_PRE] = "start-pre",
  54         [SOCKET_START_POST] = "start-post",
  55         [SOCKET_LISTENING] = "listening",
  56         [SOCKET_RUNNING] = "running",
  57         [SOCKET_STOP_PRE] = "stop-pre",
  58         [SOCKET_STOP_PRE_SIGTERM] = "stop-pre-sigterm",
  59         [SOCKET_STOP_PRE_SIGKILL] = "stop-pre-sigkill",
  60         [SOCKET_STOP_POST] = "stop-post",
  61         [SOCKET_STOP_POST_SIGTERM] = "stop-post-sigterm",
  62         [SOCKET_STOP_POST_SIGKILL] = "stop-post-sigkill",
  63         [SOCKET_MAINTAINANCE] = "maintainance"
  64 };
  65
  66 static void socket_done(Unit *u) {
  67         Socket *s = SOCKET(u);
  68         SocketPort *p;
  69
  70         assert(s);
  71
  72         while ((p = s->ports)) {
  73                 LIST_REMOVE(SocketPort, port, s->ports, p);
  74
  75                 if (p->fd >= 0)
  76                         close_nointr(p->fd);
  77                 free(p->path);
  78                 free(p);
  79         }
  80
  81         exec_context_done(&s->exec_context);
  82         exec_command_free_array(s->exec_command, _SOCKET_EXEC_COMMAND_MAX);
  83         s->control_command = NULL;
  84
  85         if (s->control_pid > 0) {
  86                 unit_unwatch_pid(u, s->control_pid);
  87                 s->control_pid = 0;
  88         }
  89
  90         s->service = NULL;
  91
  92         free(s->bind_to_device);
  93         s->bind_to_device = NULL;
  94
  95         unit_unwatch_timer(u, &s->timer_watch);
  96 }
  97
  98 static void socket_init(Unit *u) {
  99         Socket *s = SOCKET(u);
 100
 101         assert(u);
 102         assert(u->meta.load_state == UNIT_STUB);
 103
 104         s->state = 0;
 105         s->timer_watch.type = WATCH_INVALID;
 106         s->bind_ipv6_only = false;
 107         s->backlog = SOMAXCONN;
 108         s->timeout_usec = DEFAULT_TIMEOUT_USEC;
 109         s->directory_mode = 0755;
 110         s->socket_mode = 0666;
 111         s->kill_mode = 0;
 112         s->failure = false;
 113         s->control_pid = 0;
 114         s->service = NULL;
 115         exec_context_init(&s->exec_context);
 116 }
 117
 118 static int socket_load(Unit *u) {
 119         Socket *s = SOCKET(u);
 120         int r;
 121
 122         assert(u);
 123         assert(u->meta.load_state == UNIT_STUB);
 124
 125         if ((r = unit_load_fragment_and_dropin(u)) < 0)
 126                 return r;
 127
 128         /* This is a new unit? Then let's add in some extras */
 129         if (u->meta.load_state == UNIT_LOADED) {
 130
 131                 if ((r = unit_load_related_unit(u, ".service", (Unit**) &s->service)))
 132                         return r;
 133
 134                 if ((r = unit_add_dependency(u, UNIT_BEFORE, UNIT(s->service))) < 0)
 135                         return r;
 136
 137                 if ((r = unit_add_exec_dependencies(u, &s->exec_context)) < 0)
 138                         return r;
 139
 140                 if ((r = unit_add_default_cgroup(u)) < 0)
 141                         return r;
 142         }
 143
 144         return 0;
 145 }
 146
 147 static const char* listen_lookup(int type) {
 148
 149         if (type == SOCK_STREAM)
 150                 return "ListenStream";
 151         else if (type == SOCK_DGRAM)
 152                 return "ListenDatagram";
 153         else if (type == SOCK_SEQPACKET)
 154                 return "ListenSequentialPacket";
 155
 156         assert_not_reached("Unknown socket type");
 157         return NULL;
 158 }
 159
 160 static void socket_dump(Unit *u, FILE *f, const char *prefix) {
 161
 162         static const char* const command_table[_SOCKET_EXEC_COMMAND_MAX] = {
 163                 [SOCKET_EXEC_START_PRE] = "StartPre",
 164                 [SOCKET_EXEC_START_POST] = "StartPost",
 165                 [SOCKET_EXEC_STOP_PRE] = "StopPre",
 166                 [SOCKET_EXEC_STOP_POST] = "StopPost"
 167         };
 168
 169         SocketExecCommand c;
 170         Socket *s = SOCKET(u);
 171         SocketPort *p;
 172         const char *prefix2;
 173         char *p2;
 174
 175         assert(s);
 176         assert(f);
 177
 178         p2 = strappend(prefix, "\t");
 179         prefix2 = p2 ? p2 : prefix;
 180
 181         fprintf(f,
 182                 "%sSocket State: %s\n"
 183                 "%sBindIPv6Only: %s\n"
 184                 "%sBacklog: %u\n"
 185                 "%sKillMode: %s\n"
 186                 "%sSocketMode: %04o\n"
 187                 "%sDirectoryMode: %04o\n",
 188                 prefix, state_string_table[s->state],
 189                 prefix, yes_no(s->bind_ipv6_only),
 190                 prefix, s->backlog,
 191                 prefix, kill_mode_to_string(s->kill_mode),
 192                 prefix, s->socket_mode,
 193                 prefix, s->directory_mode);
 194
 195         if (s->control_pid > 0)
 196                 fprintf(f,
 197                         "%sControl PID: %llu\n",
 198                         prefix, (unsigned long long) s->control_pid);
 199
 200         if (s->bind_to_device)
 201                 fprintf(f,
 202                         "%sBindToDevice: %s\n",
 203                         prefix, s->bind_to_device);
 204
 205         LIST_FOREACH(port, p, s->ports) {
 206
 207                 if (p->type == SOCKET_SOCKET) {
 208                         const char *t;
 209                         int r;
 210                         char *k;
 211
 212                         if ((r = socket_address_print(&p->address, &k)) < 0)
 213                                 t = strerror(-r);
 214                         else
 215                                 t = k;
 216
 217                         fprintf(f, "%s%s: %s\n", prefix, listen_lookup(p->address.type), k);
 218                         free(k);
 219                 } else
 220                         fprintf(f, "%sListenFIFO: %s\n", prefix, p->path);
 221         }
 222
 223         exec_context_dump(&s->exec_context, f, prefix);
 224
 225         for (c = 0; c < _SOCKET_EXEC_COMMAND_MAX; c++) {
 226                 if (!s->exec_command[c])
 227                         continue;
 228
 229                 fprintf(f, "%s→ %s:\n",
 230                         prefix, command_table[c]);
 231
 232                 exec_command_dump_list(s->exec_command[c], f, prefix2);
 233         }
 234
 235         free(p2);
 236 }
 237
 238 static void socket_close_fds(Socket *s) {
 239         SocketPort *p;
 240
 241         assert(s);
 242
 243         LIST_FOREACH(port, p, s->ports) {
 244                 if (p->fd < 0)
 245                         continue;
 246
 247                 unit_unwatch_fd(UNIT(s), &p->fd_watch);
 248                 assert_se(close_nointr(p->fd) >= 0);
 249
 250                 p->fd = -1;
 251         }
 252 }
 253
 254 static int socket_open_fds(Socket *s) {
 255         SocketPort *p;
 256         int r;
 257
 258         assert(s);
 259
 260         LIST_FOREACH(port, p, s->ports) {
 261
 262                 if (p->fd >= 0)
 263                         continue;
 264
 265                 if (p->type == SOCKET_SOCKET) {
 266
 267                         if ((r = socket_address_listen(
 268                                              &p->address,
 269                                              s->backlog,
 270                                              s->bind_ipv6_only,
 271                                              s->bind_to_device,
 272                                              s->directory_mode,
 273                                              s->socket_mode,
 274                                              &p->fd)) < 0)
 275                                 goto rollback;
 276
 277                 } else {
 278                         struct stat st;
 279                         assert(p->type == SOCKET_FIFO);
 280
 281                         mkdir_parents(p->path, s->directory_mode);
 282
 283                         if (mkfifo(p->path, s->socket_mode) < 0 && errno != EEXIST) {
 284                                 r = -errno;
 285                                 goto rollback;
 286                         }
 287
 288                         if ((p->fd = open(p->path, O_RDWR|O_CLOEXEC|O_NOCTTY|O_NONBLOCK|O_NOFOLLOW)) < 0) {
 289                                 r = -errno;
 290                                 goto rollback;
 291                         }
 292
 293                         if (fstat(p->fd, &st) < 0) {
 294                                 r = -errno;
 295                                 goto rollback;
 296                         }
 297
 298                         /* FIXME verify user, access mode */
 299
 300                         if (!S_ISFIFO(st.st_mode)) {
 301                                 r = -EEXIST;
 302                                 goto rollback;
 303                         }
 304                 }
 305         }
 306
 307         return 0;
 308
 309 rollback:
 310         socket_close_fds(s);
 311         return r;
 312 }
 313
 314 static void socket_unwatch_fds(Socket *s) {
 315         SocketPort *p;
 316
 317         assert(s);
 318
 319         LIST_FOREACH(port, p, s->ports) {
 320                 if (p->fd < 0)
 321                         continue;
 322
 323                 unit_unwatch_fd(UNIT(s), &p->fd_watch);
 324         }
 325 }
 326
 327 static int socket_watch_fds(Socket *s) {
 328         SocketPort *p;
 329         int r;
 330
 331         assert(s);
 332
 333         LIST_FOREACH(port, p, s->ports) {
 334                 if (p->fd < 0)
 335                         continue;
 336
 337                 if ((r = unit_watch_fd(UNIT(s), p->fd, EPOLLIN, &p->fd_watch)) < 0)
 338                         goto fail;
 339         }
 340
 341         return 0;
 342
 343 fail:
 344         socket_unwatch_fds(s);
 345         return r;
 346 }
 347
 348 static void socket_set_state(Socket *s, SocketState state) {
 349         SocketState old_state;
 350         assert(s);
 351
 352         old_state = s->state;
 353         s->state = state;
 354
 355         if (state != SOCKET_START_PRE &&
 356             state != SOCKET_START_POST &&
 357             state != SOCKET_STOP_PRE &&
 358             state != SOCKET_STOP_PRE_SIGTERM &&
 359             state != SOCKET_STOP_PRE_SIGKILL &&
 360             state != SOCKET_STOP_POST &&
 361             state != SOCKET_STOP_POST_SIGTERM &&
 362             state != SOCKET_STOP_POST_SIGKILL) {
 363                 unit_unwatch_timer(UNIT(s), &s->timer_watch);
 364
 365                 if (s->control_pid > 0) {
 366                         unit_unwatch_pid(UNIT(s), s->control_pid);
 367                         s->control_pid = 0;
 368                 }
 369
 370                 s->control_command = NULL;
 371         }
 372
 373         if (state != SOCKET_START_POST &&
 374             state != SOCKET_LISTENING &&
 375             state != SOCKET_RUNNING &&
 376             state != SOCKET_STOP_PRE &&
 377             state != SOCKET_STOP_PRE_SIGTERM &&
 378             state != SOCKET_STOP_PRE_SIGKILL)
 379                 socket_close_fds(s);
 380
 381         if (state != SOCKET_LISTENING)
 382                 socket_unwatch_fds(s);
 383
 384         if (state != old_state)
 385                 log_debug("%s changed %s → %s", unit_id(UNIT(s)), state_string_table[old_state], state_string_table[state]);
 386
 387         unit_notify(UNIT(s), state_translation_table[old_state], state_translation_table[state]);
 388 }
 389
 390 static int socket_spawn(Socket *s, ExecCommand *c, pid_t *_pid) {
 391         pid_t pid;
 392         int r;
 393
 394         assert(s);
 395         assert(c);
 396         assert(_pid);
 397
 398         if ((r = unit_watch_timer(UNIT(s), s->timeout_usec, &s->timer_watch)) < 0)
 399                 goto fail;
 400
 401         if ((r = exec_spawn(c,
 402                             &s->exec_context,
 403                             NULL, 0,
 404                             true,
 405                             true,
 406                             UNIT(s)->meta.cgroup_bondings,
 407                             &pid)) < 0)
 408                 goto fail;
 409
 410         if ((r = unit_watch_pid(UNIT(s), pid)) < 0)
 411                 /* FIXME: we need to do something here */
 412                 goto fail;
 413
 414         *_pid = pid;
 415
 416         return 0;
 417
 418 fail:
 419         unit_unwatch_timer(UNIT(s), &s->timer_watch);
 420
 421         return r;
 422 }
 423
 424 static void socket_enter_dead(Socket *s, bool success) {
 425         assert(s);
 426
 427         if (!success)
 428                 s->failure = true;
 429
 430         socket_set_state(s, s->failure ? SOCKET_MAINTAINANCE : SOCKET_DEAD);
 431 }
 432
 433 static void socket_enter_stop_post(Socket *s, bool success) {
 434         int r;
 435         assert(s);
 436
 437         if (!success)
 438                 s->failure = true;
 439
 440         if ((s->control_command = s->exec_command[SOCKET_EXEC_STOP_POST]))
 441                 if ((r = socket_spawn(s, s->control_command, &s->control_pid)) < 0)
 442                         goto fail;
 443
 444         socket_set_state(s, SOCKET_STOP_POST);
 445
 446         if (!s->control_command)
 447                 socket_enter_dead(s, true);
 448
 449         return;
 450
 451 fail:
 452         log_warning("%s failed to run stop-post executable: %s", unit_id(UNIT(s)), strerror(-r));
 453         socket_enter_dead(s, false);
 454 }
 455
 456 static void socket_enter_signal(Socket *s, SocketState state, bool success) {
 457         int r;
 458
 459         assert(s);
 460
 461         if (!success)
 462                 s->failure = true;
 463
 464         if (s->control_pid > 0) {
 465                 int sig;
 466                 bool sent = false;
 467
 468                 sig = (state == SOCKET_STOP_PRE_SIGTERM || state == SOCKET_STOP_POST_SIGTERM) ? SIGTERM : SIGKILL;
 469
 470                 if (s->kill_mode == KILL_CONTROL_GROUP) {
 471
 472                         if ((r = cgroup_bonding_kill_list(UNIT(s)->meta.cgroup_bondings, sig)) < 0) {
 473                                 if (r != -EAGAIN && r != -ESRCH)
 474                                         goto fail;
 475                         } else
 476                                 sent = true;
 477                 }
 478
 479                 if (!sent)
 480                         if (kill(s->kill_mode == KILL_PROCESS ? s->control_pid : -s->control_pid, sig) < 0 && errno != ESRCH) {
 481                                 r = -errno;
 482                                 goto fail;
 483                         }
 484         }
 485
 486         socket_set_state(s, state);
 487
 488         if (s->control_pid <= 0)
 489                 socket_enter_dead(s, true);
 490
 491         return;
 492
 493 fail:
 494         log_warning("%s failed to kill processes: %s", unit_id(UNIT(s)), strerror(-r));
 495
 496         if (state == SOCKET_STOP_PRE_SIGTERM || state == SOCKET_STOP_PRE_SIGKILL)
 497                 socket_enter_stop_post(s, false);
 498         else
 499                 socket_enter_dead(s, false);
 500 }
 501
 502 static void socket_enter_stop_pre(Socket *s, bool success) {
 503         int r;
 504         assert(s);
 505
 506         if (!success)
 507                 s->failure = true;
 508
 509         if ((s->control_command = s->exec_command[SOCKET_EXEC_STOP_PRE]))
 510                 if ((r = socket_spawn(s, s->control_command, &s->control_pid)) < 0)
 511                         goto fail;
 512
 513         socket_set_state(s, SOCKET_STOP_PRE);
 514
 515         if (!s->control_command)
 516                 socket_enter_stop_post(s, true);
 517
 518         return;
 519
 520 fail:
 521         log_warning("%s failed to run stop-pre executable: %s", unit_id(UNIT(s)), strerror(-r));
 522         socket_enter_stop_post(s, false);
 523 }
 524
 525 static void socket_enter_listening(Socket *s) {
 526         int r;
 527         assert(s);
 528
 529         if ((r = socket_watch_fds(s)) < 0) {
 530                 log_warning("%s failed to watch sockets: %s", unit_id(UNIT(s)), strerror(-r));
 531                 goto fail;
 532         }
 533
 534         socket_set_state(s, SOCKET_LISTENING);
 535         return;
 536
 537 fail:
 538         socket_enter_stop_pre(s, false);
 539 }
 540
 541 static void socket_enter_start_post(Socket *s) {
 542         int r;
 543         assert(s);
 544
 545         if ((r = socket_open_fds(s)) < 0) {
 546                 log_warning("%s failed to listen on sockets: %s", unit_id(UNIT(s)), strerror(-r));
 547                 goto fail;
 548         }
 549
 550         if ((s->control_command = s->exec_command[SOCKET_EXEC_START_POST]))
 551                 if ((r = socket_spawn(s, s->control_command, &s->control_pid)) < 0) {
 552                         log_warning("%s failed to run start-post executable: %s", unit_id(UNIT(s)), strerror(-r));
 553                         goto fail;
 554                 }
 555
 556         socket_set_state(s, SOCKET_START_POST);
 557
 558         if (!s->control_command)
 559                 socket_enter_listening(s);
 560
 561         return;
 562
 563 fail:
 564         socket_enter_stop_pre(s, false);
 565 }
 566
 567 static void socket_enter_start_pre(Socket *s) {
 568         int r;
 569         assert(s);
 570
 571         if ((s->control_command = s->exec_command[SOCKET_EXEC_START_PRE]))
 572                 if ((r = socket_spawn(s, s->control_command, &s->control_pid)) < 0)
 573                         goto fail;
 574
 575         socket_set_state(s, SOCKET_START_PRE);
 576
 577         if (!s->control_command)
 578                 socket_enter_start_post(s);
 579
 580         return;
 581
 582 fail:
 583         log_warning("%s failed to run start-pre exectuable: %s", unit_id(UNIT(s)), strerror(-r));
 584         socket_enter_dead(s, false);
 585 }
 586
 587 static void socket_enter_running(Socket *s) {
 588         int r;
 589
 590         assert(s);
 591
 592         if ((r = manager_add_job(UNIT(s)->meta.manager, JOB_START, UNIT(s->service), JOB_REPLACE, true, NULL)) < 0)
 593                 goto fail;
 594
 595         socket_set_state(s, SOCKET_RUNNING);
 596         return;
 597
 598 fail:
 599         log_warning("%s failed to queue socket startup job: %s", unit_id(UNIT(s)), strerror(-r));
 600         socket_enter_dead(s, false);
 601 }
 602
 603 static void socket_run_next(Socket *s, bool success) {
 604         int r;
 605
 606         assert(s);
 607         assert(s->control_command);
 608         assert(s->control_command->command_next);
 609
 610         if (!success)
 611                 s->failure = true;
 612
 613         s->control_command = s->control_command->command_next;
 614
 615         if ((r = socket_spawn(s, s->control_command, &s->control_pid)) < 0)
 616                 goto fail;
 617
 618         return;
 619
 620 fail:
 621         if (s->state == SOCKET_STOP_PRE)
 622                 socket_enter_stop_post(s, false);
 623         else if (s->state == SOCKET_STOP_POST)
 624                 socket_enter_dead(s, false);
 625         else
 626                 socket_enter_stop_pre(s, false);
 627 }
 628
 629 static int socket_start(Unit *u) {
 630         Socket *s = SOCKET(u);
 631
 632         assert(s);
 633
 634         /* We cannot fulfill this request right now, try again later
 635          * please! */
 636         if (s->state == SOCKET_STOP_PRE ||
 637             s->state == SOCKET_STOP_PRE_SIGKILL ||
 638             s->state == SOCKET_STOP_PRE_SIGTERM ||
 639             s->state == SOCKET_STOP_POST ||
 640             s->state == SOCKET_STOP_POST_SIGTERM ||
 641             s->state == SOCKET_STOP_POST_SIGKILL)
 642                 return -EAGAIN;
 643
 644         if (s->state == SOCKET_START_PRE ||
 645             s->state == SOCKET_START_POST)
 646                 return 0;
 647
 648         /* Cannot run this without the service being around */
 649         if (s->service->meta.load_state != UNIT_LOADED)
 650                 return -ENOENT;
 651
 652         /* If the service is alredy actvie we cannot start the
 653          * socket */
 654         if (s->service->state != SERVICE_DEAD &&
 655             s->service->state != SERVICE_MAINTAINANCE &&
 656             s->service->state != SERVICE_AUTO_RESTART)
 657                 return -EBUSY;
 658
 659         assert(s->state == SOCKET_DEAD || s->state == SOCKET_MAINTAINANCE);
 660
 661         s->failure = false;
 662         socket_enter_start_pre(s);
 663         return 0;
 664 }
 665
 666 static int socket_stop(Unit *u) {
 667         Socket *s = SOCKET(u);
 668
 669         assert(s);
 670
 671         /* We cannot fulfill this request right now, try again later
 672          * please! */
 673         if (s->state == SOCKET_START_PRE ||
 674             s->state == SOCKET_START_POST)
 675                 return -EAGAIN;
 676
 677         /* Already on it */
 678         if (s->state == SOCKET_STOP_PRE ||
 679             s->state == SOCKET_STOP_PRE_SIGTERM ||
 680             s->state == SOCKET_STOP_PRE_SIGKILL ||
 681             s->state == SOCKET_STOP_POST ||
 682             s->state == SOCKET_STOP_POST_SIGTERM ||
 683             s->state == SOCKET_STOP_POST_SIGTERM)
 684                 return 0;
 685
 686         assert(s->state == SOCKET_LISTENING || s->state == SOCKET_RUNNING);
 687
 688         socket_enter_stop_pre(s, true);
 689         return 0;
 690 }
 691
 692 static UnitActiveState socket_active_state(Unit *u) {
 693         assert(u);
 694
 695         return state_translation_table[SOCKET(u)->state];
 696 }
 697
 698 static void socket_fd_event(Unit *u, int fd, uint32_t events, Watch *w) {
 699         Socket *s = SOCKET(u);
 700
 701         assert(s);
 702
 703         log_debug("Incoming traffic on %s", unit_id(u));
 704
 705         if (events != EPOLLIN)
 706                 socket_enter_stop_pre(s, false);
 707
 708         socket_enter_running(s);
 709 }
 710
 711 static void socket_sigchld_event(Unit *u, pid_t pid, int code, int status) {
 712         Socket *s = SOCKET(u);
 713         bool success;
 714
 715         assert(s);
 716         assert(pid >= 0);
 717
 718         success = code == CLD_EXITED && status == 0;
 719         s->failure = s->failure || !success;
 720
 721         assert(s->control_pid == pid);
 722         assert(s->control_command);
 723
 724         exec_status_fill(&s->control_command->exec_status, pid, code, status);
 725         s->control_pid = 0;
 726
 727         log_debug("%s control process exited, code=%s status=%i", unit_id(u), sigchld_code_to_string(code), status);
 728
 729         if (s->control_command->command_next &&
 730             (success || (s->state == SOCKET_STOP_PRE || s->state == SOCKET_STOP_POST))) {
 731                 log_debug("%s running next command for the state %s", unit_id(u), state_string_table[s->state]);
 732                 socket_run_next(s, success);
 733         } else {
 734                 /* No further commands for this step, so let's figure
 735                  * out what to do next */
 736
 737                 log_debug("%s got final SIGCHLD for state %s", unit_id(u), state_string_table[s->state]);
 738
 739                 switch (s->state) {
 740
 741                 case SOCKET_START_PRE:
 742                         if (success)
 743                                 socket_enter_start_post(s);
 744                         else
 745                                 socket_enter_stop_pre(s, false);
 746                         break;
 747
 748                 case SOCKET_START_POST:
 749                         if (success)
 750                                 socket_enter_listening(s);
 751                         else
 752                                 socket_enter_stop_pre(s, false);
 753                         break;
 754
 755                 case SOCKET_STOP_PRE:
 756                 case SOCKET_STOP_PRE_SIGTERM:
 757                 case SOCKET_STOP_PRE_SIGKILL:
 758                         socket_enter_stop_post(s, success);
 759                         break;
 760
 761                 case SOCKET_STOP_POST:
 762                 case SOCKET_STOP_POST_SIGTERM:
 763                 case SOCKET_STOP_POST_SIGKILL:
 764                         socket_enter_dead(s, success);
 765                         break;
 766
 767                 default:
 768                         assert_not_reached("Uh, control process died at wrong time.");
 769                 }
 770         }
 771 }
 772
 773 static void socket_timer_event(Unit *u, uint64_t elapsed, Watch *w) {
 774         Socket *s = SOCKET(u);
 775
 776         assert(s);
 777         assert(elapsed == 1);
 778         assert(w == &s->timer_watch);
 779
 780         switch (s->state) {
 781
 782         case SOCKET_START_PRE:
 783         case SOCKET_START_POST:
 784                 log_warning("%s starting timed out. Stopping.", unit_id(u));
 785                 socket_enter_stop_pre(s, false);
 786                 break;
 787
 788         case SOCKET_STOP_PRE:
 789                 log_warning("%s stopping timed out. Terminating.", unit_id(u));
 790                 socket_enter_signal(s, SOCKET_STOP_PRE_SIGTERM, false);
 791                 break;
 792
 793         case SOCKET_STOP_PRE_SIGTERM:
 794                 log_warning("%s stopping timed out. Killing.", unit_id(u));
 795                 socket_enter_signal(s, SOCKET_STOP_PRE_SIGKILL, false);
 796                 break;
 797
 798         case SOCKET_STOP_PRE_SIGKILL:
 799                 log_warning("%s still around after SIGKILL. Ignoring.", unit_id(u));
 800                 socket_enter_stop_post(s, false);
 801                 break;
 802
 803         case SOCKET_STOP_POST:
 804                 log_warning("%s stopping timed out (2). Terminating.", unit_id(u));
 805                 socket_enter_signal(s, SOCKET_STOP_POST_SIGTERM, false);
 806                 break;
 807
 808         case SOCKET_STOP_POST_SIGTERM:
 809                 log_warning("%s stopping timed out (2). Killing.", unit_id(u));
 810                 socket_enter_signal(s, SOCKET_STOP_POST_SIGKILL, false);
 811                 break;
 812
 813         case SOCKET_STOP_POST_SIGKILL:
 814                 log_warning("%s still around after SIGKILL (2). Entering maintainance mode.", unit_id(u));
 815                 socket_enter_dead(s, false);
 816                 break;
 817
 818         default:
 819                 assert_not_reached("Timeout at wrong time.");
 820         }
 821 }
 822
 823 int socket_collect_fds(Socket *s, int **fds, unsigned *n_fds) {
 824         int *rfds;
 825         unsigned rn_fds, k;
 826         SocketPort *p;
 827
 828         assert(s);
 829         assert(fds);
 830         assert(n_fds);
 831
 832         /* Called from the service code for requesting our fds */
 833
 834         rn_fds = 0;
 835         LIST_FOREACH(port, p, s->ports)
 836                 if (p->fd >= 0)
 837                         rn_fds++;
 838
 839         if (!(rfds = new(int, rn_fds)) < 0)
 840                 return -ENOMEM;
 841
 842         k = 0;
 843         LIST_FOREACH(port, p, s->ports)
 844                 if (p->fd >= 0)
 845                         rfds[k++] = p->fd;
 846
 847         assert(k == rn_fds);
 848
 849         *fds = rfds;
 850         *n_fds = rn_fds;
 851
 852         return 0;
 853 }
 854
 855 void socket_notify_service_dead(Socket *s) {
 856         assert(s);
 857
 858         /* The service is dead. Dang. */
 859
 860         if (s->state == SOCKET_RUNNING) {
 861                 log_debug("%s got notified about service death.", unit_id(UNIT(s)));
 862                 socket_enter_listening(s);
 863         }
 864 }
 865
 866 const UnitVTable socket_vtable = {
 867         .suffix = ".socket",
 868
 869         .init = socket_init,
 870         .load = socket_load,
 871         .done = socket_done,
 872
 873         .dump = socket_dump,
 874
 875         .start = socket_start,
 876         .stop = socket_stop,
 877
 878         .active_state = socket_active_state,
 879
 880         .fd_event = socket_fd_event,
 881         .sigchld_event = socket_sigchld_event,
 882         .timer_event = socket_timer_event
 883 };