src/journal/journald-stream.c

   1 /***
   2   This file is part of systemd.
   3
   4   Copyright 2011 Lennart Poettering
   5
   6   systemd is free software; you can redistribute it and/or modify it
   7   under the terms of the GNU Lesser General Public License as published by
   8   the Free Software Foundation; either version 2.1 of the License, or
   9   (at your option) any later version.
  10
  11   systemd is distributed in the hope that it will be useful, but
  12   WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  14   Lesser General Public License for more details.
  15
  16   You should have received a copy of the GNU Lesser General Public License
  17   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  18 ***/
  19
  20 #include <stddef.h>
  21 #include <unistd.h>
  22
  23 #ifdef HAVE_SELINUX
  24 #include <selinux/selinux.h>
  25 #endif
  26
  27 #include "sd-daemon.h"
  28 #include "sd-event.h"
  29
  30 #include "alloc-util.h"
  31 #include "dirent-util.h"
  32 #include "escape.h"
  33 #include "fd-util.h"
  34 #include "fileio.h"
  35 #include "io-util.h"
  36 #include "journald-console.h"
  37 #include "journald-kmsg.h"
  38 #include "journald-server.h"
  39 #include "journald-stream.h"
  40 #include "journald-syslog.h"
  41 #include "journald-wall.h"
  42 #include "mkdir.h"
  43 #include "parse-util.h"
  44 #include "selinux-util.h"
  45 #include "socket-util.h"
  46 #include "stdio-util.h"
  47 #include "string-util.h"
  48 #include "syslog-util.h"
  49
  50 #define STDOUT_STREAMS_MAX 4096
  51
  52 typedef enum StdoutStreamState {
  53         STDOUT_STREAM_IDENTIFIER,
  54         STDOUT_STREAM_UNIT_ID,
  55         STDOUT_STREAM_PRIORITY,
  56         STDOUT_STREAM_LEVEL_PREFIX,
  57         STDOUT_STREAM_FORWARD_TO_SYSLOG,
  58         STDOUT_STREAM_FORWARD_TO_KMSG,
  59         STDOUT_STREAM_FORWARD_TO_CONSOLE,
  60         STDOUT_STREAM_RUNNING
  61 } StdoutStreamState;
  62
  63 struct StdoutStream {
  64         Server *server;
  65         StdoutStreamState state;
  66
  67         int fd;
  68
  69         struct ucred ucred;
  70         char *label;
  71         char *identifier;
  72         char *unit_id;
  73         int priority;
  74         bool level_prefix:1;
  75         bool forward_to_syslog:1;
  76         bool forward_to_kmsg:1;
  77         bool forward_to_console:1;
  78
  79         bool fdstore:1;
  80         bool in_notify_queue:1;
  81
  82         char buffer[LINE_MAX+1];
  83         size_t length;
  84
  85         sd_event_source *event_source;
  86
  87         char *state_file;
  88
  89         LIST_FIELDS(StdoutStream, stdout_stream);
  90         LIST_FIELDS(StdoutStream, stdout_stream_notify_queue);
  91 };
  92
  93 void stdout_stream_free(StdoutStream *s) {
  94         if (!s)
  95                 return;
  96
  97         if (s->server) {
  98                 assert(s->server->n_stdout_streams > 0);
  99                 s->server->n_stdout_streams--;
 100                 LIST_REMOVE(stdout_stream, s->server->stdout_streams, s);
 101
 102                 if (s->in_notify_queue)
 103                         LIST_REMOVE(stdout_stream_notify_queue, s->server->stdout_streams_notify_queue, s);
 104         }
 105
 106         if (s->event_source) {
 107                 sd_event_source_set_enabled(s->event_source, SD_EVENT_OFF);
 108                 s->event_source = sd_event_source_unref(s->event_source);
 109         }
 110
 111         safe_close(s->fd);
 112         free(s->label);
 113         free(s->identifier);
 114         free(s->unit_id);
 115         free(s->state_file);
 116
 117         free(s);
 118 }
 119
 120 DEFINE_TRIVIAL_CLEANUP_FUNC(StdoutStream*, stdout_stream_free);
 121
 122 static void stdout_stream_destroy(StdoutStream *s) {
 123         if (!s)
 124                 return;
 125
 126         if (s->state_file)
 127                 (void) unlink(s->state_file);
 128
 129         stdout_stream_free(s);
 130 }
 131
 132 static int stdout_stream_save(StdoutStream *s) {
 133         _cleanup_free_ char *temp_path = NULL;
 134         _cleanup_fclose_ FILE *f = NULL;
 135         int r;
 136
 137         assert(s);
 138
 139         if (s->state != STDOUT_STREAM_RUNNING)
 140                 return 0;
 141
 142         if (!s->state_file) {
 143                 struct stat st;
 144
 145                 r = fstat(s->fd, &st);
 146                 if (r < 0)
 147                         return log_warning_errno(errno, "Failed to stat connected stream: %m");
 148
 149                 /* We use device and inode numbers as identifier for the stream */
 150                 if (asprintf(&s->state_file, "/run/systemd/journal/streams/%lu:%lu", (unsigned long) st.st_dev, (unsigned long) st.st_ino) < 0)
 151                         return log_oom();
 152         }
 153
 154         mkdir_p("/run/systemd/journal/streams", 0755);
 155
 156         r = fopen_temporary(s->state_file, &f, &temp_path);
 157         if (r < 0)
 158                 goto fail;
 159
 160         fprintf(f,
 161                 "# This is private data. Do not parse\n"
 162                 "PRIORITY=%i\n"
 163                 "LEVEL_PREFIX=%i\n"
 164                 "FORWARD_TO_SYSLOG=%i\n"
 165                 "FORWARD_TO_KMSG=%i\n"
 166                 "FORWARD_TO_CONSOLE=%i\n",
 167                 s->priority,
 168                 s->level_prefix,
 169                 s->forward_to_syslog,
 170                 s->forward_to_kmsg,
 171                 s->forward_to_console);
 172
 173         if (!isempty(s->identifier)) {
 174                 _cleanup_free_ char *escaped;
 175
 176                 escaped = cescape(s->identifier);
 177                 if (!escaped) {
 178                         r = -ENOMEM;
 179                         goto fail;
 180                 }
 181
 182                 fprintf(f, "IDENTIFIER=%s\n", escaped);
 183         }
 184
 185         if (!isempty(s->unit_id)) {
 186                 _cleanup_free_ char *escaped;
 187
 188                 escaped = cescape(s->unit_id);
 189                 if (!escaped) {
 190                         r = -ENOMEM;
 191                         goto fail;
 192                 }
 193
 194                 fprintf(f, "UNIT=%s\n", escaped);
 195         }
 196
 197         r = fflush_and_check(f);
 198         if (r < 0)
 199                 goto fail;
 200
 201         if (rename(temp_path, s->state_file) < 0) {
 202                 r = -errno;
 203                 goto fail;
 204         }
 205
 206         if (!s->fdstore && !s->in_notify_queue) {
 207                 LIST_PREPEND(stdout_stream_notify_queue, s->server->stdout_streams_notify_queue, s);
 208                 s->in_notify_queue = true;
 209
 210                 if (s->server->notify_event_source) {
 211                         r = sd_event_source_set_enabled(s->server->notify_event_source, SD_EVENT_ON);
 212                         if (r < 0)
 213                                 log_warning_errno(r, "Failed to enable notify event source: %m");
 214                 }
 215         }
 216
 217         return 0;
 218
 219 fail:
 220         (void) unlink(s->state_file);
 221
 222         if (temp_path)
 223                 (void) unlink(temp_path);
 224
 225         return log_error_errno(r, "Failed to save stream data %s: %m", s->state_file);
 226 }
 227
 228 static int stdout_stream_log(StdoutStream *s, const char *p) {
 229         struct iovec iovec[N_IOVEC_META_FIELDS + 5];
 230         int priority;
 231         char syslog_priority[] = "PRIORITY=\0";
 232         char syslog_facility[sizeof("SYSLOG_FACILITY=")-1 + DECIMAL_STR_MAX(int) + 1];
 233         _cleanup_free_ char *message = NULL, *syslog_identifier = NULL;
 234         unsigned n = 0;
 235         size_t label_len;
 236
 237         assert(s);
 238         assert(p);
 239
 240         priority = s->priority;
 241
 242         if (s->level_prefix)
 243                 syslog_parse_priority(&p, &priority, false);
 244
 245         if (isempty(p))
 246                 return 0;
 247
 248         if (s->forward_to_syslog || s->server->forward_to_syslog)
 249                 server_forward_syslog(s->server, syslog_fixup_facility(priority), s->identifier, p, &s->ucred, NULL);
 250
 251         if (s->forward_to_kmsg || s->server->forward_to_kmsg)
 252                 server_forward_kmsg(s->server, priority, s->identifier, p, &s->ucred);
 253
 254         if (s->forward_to_console || s->server->forward_to_console)
 255                 server_forward_console(s->server, priority, s->identifier, p, &s->ucred);
 256
 257         if (s->server->forward_to_wall)
 258                 server_forward_wall(s->server, priority, s->identifier, p, &s->ucred);
 259
 260         IOVEC_SET_STRING(iovec[n++], "_TRANSPORT=stdout");
 261
 262         syslog_priority[strlen("PRIORITY=")] = '0' + LOG_PRI(priority);
 263         IOVEC_SET_STRING(iovec[n++], syslog_priority);
 264
 265         if (priority & LOG_FACMASK) {
 266                 xsprintf(syslog_facility, "SYSLOG_FACILITY=%i", LOG_FAC(priority));
 267                 IOVEC_SET_STRING(iovec[n++], syslog_facility);
 268         }
 269
 270         if (s->identifier) {
 271                 syslog_identifier = strappend("SYSLOG_IDENTIFIER=", s->identifier);
 272                 if (syslog_identifier)
 273                         IOVEC_SET_STRING(iovec[n++], syslog_identifier);
 274         }
 275
 276         message = strappend("MESSAGE=", p);
 277         if (message)
 278                 IOVEC_SET_STRING(iovec[n++], message);
 279
 280         label_len = s->label ? strlen(s->label) : 0;
 281         server_dispatch_message(s->server, iovec, n, ELEMENTSOF(iovec), &s->ucred, NULL, s->label, label_len, s->unit_id, priority, 0);
 282         return 0;
 283 }
 284
 285 static int stdout_stream_line(StdoutStream *s, char *p) {
 286         int r;
 287         char *orig;
 288
 289         assert(s);
 290         assert(p);
 291
 292         orig = p;
 293         p = strstrip(p);
 294
 295         switch (s->state) {
 296
 297         case STDOUT_STREAM_IDENTIFIER:
 298                 if (isempty(p))
 299                         s->identifier = NULL;
 300                 else  {
 301                         s->identifier = strdup(p);
 302                         if (!s->identifier)
 303                                 return log_oom();
 304                 }
 305
 306                 s->state = STDOUT_STREAM_UNIT_ID;
 307                 return 0;
 308
 309         case STDOUT_STREAM_UNIT_ID:
 310                 if (s->ucred.uid == 0) {
 311                         if (isempty(p))
 312                                 s->unit_id = NULL;
 313                         else  {
 314                                 s->unit_id = strdup(p);
 315                                 if (!s->unit_id)
 316                                         return log_oom();
 317                         }
 318                 }
 319
 320                 s->state = STDOUT_STREAM_PRIORITY;
 321                 return 0;
 322
 323         case STDOUT_STREAM_PRIORITY:
 324                 r = safe_atoi(p, &s->priority);
 325                 if (r < 0 || s->priority < 0 || s->priority > 999) {
 326                         log_warning("Failed to parse log priority line.");
 327                         return -EINVAL;
 328                 }
 329
 330                 s->state = STDOUT_STREAM_LEVEL_PREFIX;
 331                 return 0;
 332
 333         case STDOUT_STREAM_LEVEL_PREFIX:
 334                 r = parse_boolean(p);
 335                 if (r < 0) {
 336                         log_warning("Failed to parse level prefix line.");
 337                         return -EINVAL;
 338                 }
 339
 340                 s->level_prefix = !!r;
 341                 s->state = STDOUT_STREAM_FORWARD_TO_SYSLOG;
 342                 return 0;
 343
 344         case STDOUT_STREAM_FORWARD_TO_SYSLOG:
 345                 r = parse_boolean(p);
 346                 if (r < 0) {
 347                         log_warning("Failed to parse forward to syslog line.");
 348                         return -EINVAL;
 349                 }
 350
 351                 s->forward_to_syslog = !!r;
 352                 s->state = STDOUT_STREAM_FORWARD_TO_KMSG;
 353                 return 0;
 354
 355         case STDOUT_STREAM_FORWARD_TO_KMSG:
 356                 r = parse_boolean(p);
 357                 if (r < 0) {
 358                         log_warning("Failed to parse copy to kmsg line.");
 359                         return -EINVAL;
 360                 }
 361
 362                 s->forward_to_kmsg = !!r;
 363                 s->state = STDOUT_STREAM_FORWARD_TO_CONSOLE;
 364                 return 0;
 365
 366         case STDOUT_STREAM_FORWARD_TO_CONSOLE:
 367                 r = parse_boolean(p);
 368                 if (r < 0) {
 369                         log_warning("Failed to parse copy to console line.");
 370                         return -EINVAL;
 371                 }
 372
 373                 s->forward_to_console = !!r;
 374                 s->state = STDOUT_STREAM_RUNNING;
 375
 376                 /* Try to save the stream, so that journald can be restarted and we can recover */
 377                 (void) stdout_stream_save(s);
 378                 return 0;
 379
 380         case STDOUT_STREAM_RUNNING:
 381                 return stdout_stream_log(s, orig);
 382         }
 383
 384         assert_not_reached("Unknown stream state");
 385 }
 386
 387 static int stdout_stream_scan(StdoutStream *s, bool force_flush) {
 388         char *p;
 389         size_t remaining;
 390         int r;
 391
 392         assert(s);
 393
 394         p = s->buffer;
 395         remaining = s->length;
 396
 397         /* XXX: This function does nothing if (s->length == 0) */
 398
 399         for (;;) {
 400                 char *end;
 401                 size_t skip;
 402
 403                 end = memchr(p, '\n', remaining);
 404                 if (end)
 405                         skip = end - p + 1;
 406                 else if (remaining >= sizeof(s->buffer) - 1) {
 407                         end = p + sizeof(s->buffer) - 1;
 408                         skip = remaining;
 409                 } else
 410                         break;
 411
 412                 *end = 0;
 413
 414                 r = stdout_stream_line(s, p);
 415                 if (r < 0)
 416                         return r;
 417
 418                 remaining -= skip;
 419                 p += skip;
 420         }
 421
 422         if (force_flush && remaining > 0) {
 423                 p[remaining] = 0;
 424                 r = stdout_stream_line(s, p);
 425                 if (r < 0)
 426                         return r;
 427
 428                 p += remaining;
 429                 remaining = 0;
 430         }
 431
 432         if (p > s->buffer) {
 433                 memmove(s->buffer, p, remaining);
 434                 s->length = remaining;
 435         }
 436
 437         return 0;
 438 }
 439
 440 static int stdout_stream_process(sd_event_source *es, int fd, uint32_t revents, void *userdata) {
 441         StdoutStream *s = userdata;
 442         ssize_t l;
 443         int r;
 444
 445         assert(s);
 446
 447         if ((revents|EPOLLIN|EPOLLHUP) != (EPOLLIN|EPOLLHUP)) {
 448                 log_error("Got invalid event from epoll for stdout stream: %"PRIx32, revents);
 449                 goto terminate;
 450         }
 451
 452         l = read(s->fd, s->buffer+s->length, sizeof(s->buffer)-1-s->length);
 453         if (l < 0) {
 454
 455                 if (errno == EAGAIN)
 456                         return 0;
 457
 458                 log_warning_errno(errno, "Failed to read from stream: %m");
 459                 goto terminate;
 460         }
 461
 462         if (l == 0) {
 463                 stdout_stream_scan(s, true);
 464                 goto terminate;
 465         }
 466
 467         s->length += l;
 468         r = stdout_stream_scan(s, false);
 469         if (r < 0)
 470                 goto terminate;
 471
 472         return 1;
 473
 474 terminate:
 475         stdout_stream_destroy(s);
 476         return 0;
 477 }
 478
 479 static int stdout_stream_install(Server *s, int fd, StdoutStream **ret) {
 480         _cleanup_(stdout_stream_freep) StdoutStream *stream = NULL;
 481         int r;
 482
 483         assert(s);
 484         assert(fd >= 0);
 485
 486         stream = new0(StdoutStream, 1);
 487         if (!stream)
 488                 return log_oom();
 489
 490         stream->fd = -1;
 491         stream->priority = LOG_INFO;
 492
 493         r = getpeercred(fd, &stream->ucred);
 494         if (r < 0)
 495                 return log_error_errno(r, "Failed to determine peer credentials: %m");
 496
 497         if (mac_selinux_use()) {
 498                 r = getpeersec(fd, &stream->label);
 499                 if (r < 0 && r != -EOPNOTSUPP)
 500                         (void) log_warning_errno(r, "Failed to determine peer security context: %m");
 501         }
 502
 503         (void) shutdown(fd, SHUT_WR);
 504
 505         r = sd_event_add_io(s->event, &stream->event_source, fd, EPOLLIN, stdout_stream_process, stream);
 506         if (r < 0)
 507                 return log_error_errno(r, "Failed to add stream to event loop: %m");
 508
 509         r = sd_event_source_set_priority(stream->event_source, SD_EVENT_PRIORITY_NORMAL+5);
 510         if (r < 0)
 511                 return log_error_errno(r, "Failed to adjust stdout event source priority: %m");
 512
 513         stream->fd = fd;
 514
 515         stream->server = s;
 516         LIST_PREPEND(stdout_stream, s->stdout_streams, stream);
 517         s->n_stdout_streams++;
 518
 519         if (ret)
 520                 *ret = stream;
 521
 522         stream = NULL;
 523
 524         return 0;
 525 }
 526
 527 static int stdout_stream_new(sd_event_source *es, int listen_fd, uint32_t revents, void *userdata) {
 528         _cleanup_close_ int fd = -1;
 529         Server *s = userdata;
 530         int r;
 531
 532         assert(s);
 533
 534         if (revents != EPOLLIN) {
 535                 log_error("Got invalid event from epoll for stdout server fd: %"PRIx32, revents);
 536                 return -EIO;
 537         }
 538
 539         fd = accept4(s->stdout_fd, NULL, NULL, SOCK_NONBLOCK|SOCK_CLOEXEC);
 540         if (fd < 0) {
 541                 if (errno == EAGAIN)
 542                         return 0;
 543
 544                 return log_error_errno(errno, "Failed to accept stdout connection: %m");
 545         }
 546
 547         if (s->n_stdout_streams >= STDOUT_STREAMS_MAX) {
 548                 log_warning("Too many stdout streams, refusing connection.");
 549                 return 0;
 550         }
 551
 552         r = stdout_stream_install(s, fd, NULL);
 553         if (r < 0)
 554                 return r;
 555
 556         fd = -1;
 557         return 0;
 558 }
 559
 560 static int stdout_stream_load(StdoutStream *stream, const char *fname) {
 561         _cleanup_free_ char
 562                 *priority = NULL,
 563                 *level_prefix = NULL,
 564                 *forward_to_syslog = NULL,
 565                 *forward_to_kmsg = NULL,
 566                 *forward_to_console = NULL;
 567         int r;
 568
 569         assert(stream);
 570         assert(fname);
 571
 572         if (!stream->state_file) {
 573                 stream->state_file = strappend("/run/systemd/journal/streams/", fname);
 574                 if (!stream->state_file)
 575                         return log_oom();
 576         }
 577
 578         r = parse_env_file(stream->state_file, NEWLINE,
 579                            "PRIORITY", &priority,
 580                            "LEVEL_PREFIX", &level_prefix,
 581                            "FORWARD_TO_SYSLOG", &forward_to_syslog,
 582                            "FORWARD_TO_KMSG", &forward_to_kmsg,
 583                            "FORWARD_TO_CONSOLE", &forward_to_console,
 584                            "IDENTIFIER", &stream->identifier,
 585                            "UNIT", &stream->unit_id,
 586                            NULL);
 587         if (r < 0)
 588                 return log_error_errno(r, "Failed to read: %s", stream->state_file);
 589
 590         if (priority) {
 591                 int p;
 592
 593                 p = log_level_from_string(priority);
 594                 if (p >= 0)
 595                         stream->priority = p;
 596         }
 597
 598         if (level_prefix) {
 599                 r = parse_boolean(level_prefix);
 600                 if (r >= 0)
 601                         stream->level_prefix = r;
 602         }
 603
 604         if (forward_to_syslog) {
 605                 r = parse_boolean(forward_to_syslog);
 606                 if (r >= 0)
 607                         stream->forward_to_syslog = r;
 608         }
 609
 610         if (forward_to_kmsg) {
 611                 r = parse_boolean(forward_to_kmsg);
 612                 if (r >= 0)
 613                         stream->forward_to_kmsg = r;
 614         }
 615
 616         if (forward_to_console) {
 617                 r = parse_boolean(forward_to_console);
 618                 if (r >= 0)
 619                         stream->forward_to_console = r;
 620         }
 621
 622         return 0;
 623 }
 624
 625 static int stdout_stream_restore(Server *s, const char *fname, int fd) {
 626         StdoutStream *stream;
 627         int r;
 628
 629         assert(s);
 630         assert(fname);
 631         assert(fd >= 0);
 632
 633         if (s->n_stdout_streams >= STDOUT_STREAMS_MAX) {
 634                 log_warning("Too many stdout streams, refusing restoring of stream.");
 635                 return -ENOBUFS;
 636         }
 637
 638         r = stdout_stream_install(s, fd, &stream);
 639         if (r < 0)
 640                 return r;
 641
 642         stream->state = STDOUT_STREAM_RUNNING;
 643         stream->fdstore = true;
 644
 645         /* Ignore all parsing errors */
 646         (void) stdout_stream_load(stream, fname);
 647
 648         return 0;
 649 }
 650
 651 int server_restore_streams(Server *s, FDSet *fds) {
 652         _cleanup_closedir_ DIR *d = NULL;
 653         struct dirent *de;
 654         int r;
 655
 656         d = opendir("/run/systemd/journal/streams");
 657         if (!d) {
 658                 if (errno == ENOENT)
 659                         return 0;
 660
 661                 return log_warning_errno(errno, "Failed to enumerate /run/systemd/journal/streams: %m");
 662         }
 663
 664         FOREACH_DIRENT(de, d, goto fail) {
 665                 unsigned long st_dev, st_ino;
 666                 bool found = false;
 667                 Iterator i;
 668                 int fd;
 669
 670                 if (sscanf(de->d_name, "%lu:%lu", &st_dev, &st_ino) != 2)
 671                         continue;
 672
 673                 FDSET_FOREACH(fd, fds, i) {
 674                         struct stat st;
 675
 676                         if (fstat(fd, &st) < 0)
 677                                 return log_error_errno(errno, "Failed to stat %s: %m", de->d_name);
 678
 679                         if (S_ISSOCK(st.st_mode) && st.st_dev == st_dev && st.st_ino == st_ino) {
 680                                 found = true;
 681                                 break;
 682                         }
 683                 }
 684
 685                 if (!found) {
 686                         /* No file descriptor? Then let's delete the state file */
 687                         log_debug("Cannot restore stream file %s", de->d_name);
 688                         unlinkat(dirfd(d), de->d_name, 0);
 689                         continue;
 690                 }
 691
 692                 fdset_remove(fds, fd);
 693
 694                 r = stdout_stream_restore(s, de->d_name, fd);
 695                 if (r < 0)
 696                         safe_close(fd);
 697         }
 698
 699         return 0;
 700
 701 fail:
 702         return log_error_errno(errno, "Failed to read streams directory: %m");
 703 }
 704
 705 int server_open_stdout_socket(Server *s) {
 706         static const union sockaddr_union sa = {
 707                 .un.sun_family = AF_UNIX,
 708                 .un.sun_path = "/run/systemd/journal/stdout",
 709         };
 710         int r;
 711
 712         assert(s);
 713
 714         if (s->stdout_fd < 0) {
 715                 s->stdout_fd = socket(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0);
 716                 if (s->stdout_fd < 0)
 717                         return log_error_errno(errno, "socket() failed: %m");
 718
 719                 (void) unlink(sa.un.sun_path);
 720
 721                 r = bind(s->stdout_fd, &sa.sa, SOCKADDR_UN_LEN(sa.un));
 722                 if (r < 0)
 723                         return log_error_errno(errno, "bind(%s) failed: %m", sa.un.sun_path);
 724
 725                 (void) chmod(sa.un.sun_path, 0666);
 726
 727                 if (listen(s->stdout_fd, SOMAXCONN) < 0)
 728                         return log_error_errno(errno, "listen(%s) failed: %m", sa.un.sun_path);
 729         } else
 730                 fd_nonblock(s->stdout_fd, 1);
 731
 732         r = sd_event_add_io(s->event, &s->stdout_event_source, s->stdout_fd, EPOLLIN, stdout_stream_new, s);
 733         if (r < 0)
 734                 return log_error_errno(r, "Failed to add stdout server fd to event source: %m");
 735
 736         r = sd_event_source_set_priority(s->stdout_event_source, SD_EVENT_PRIORITY_NORMAL+5);
 737         if (r < 0)
 738                 return log_error_errno(r, "Failed to adjust priority of stdout server event source: %m");
 739
 740         return 0;
 741 }
 742
 743 void stdout_stream_send_notify(StdoutStream *s) {
 744         struct iovec iovec = {
 745                 .iov_base = (char*) "FDSTORE=1",
 746                 .iov_len = strlen("FDSTORE=1"),
 747         };
 748         struct msghdr msghdr = {
 749                 .msg_iov = &iovec,
 750                 .msg_iovlen = 1,
 751         };
 752         struct cmsghdr *cmsg;
 753         ssize_t l;
 754
 755         assert(s);
 756         assert(!s->fdstore);
 757         assert(s->in_notify_queue);
 758         assert(s->server);
 759         assert(s->server->notify_fd >= 0);
 760
 761         /* Store the connection fd in PID 1, so that we get it passed
 762          * in again on next start */
 763
 764         msghdr.msg_controllen = CMSG_SPACE(sizeof(int));
 765         msghdr.msg_control = alloca0(msghdr.msg_controllen);
 766
 767         cmsg = CMSG_FIRSTHDR(&msghdr);
 768         cmsg->cmsg_level = SOL_SOCKET;
 769         cmsg->cmsg_type = SCM_RIGHTS;
 770         cmsg->cmsg_len = CMSG_LEN(sizeof(int));
 771
 772         memcpy(CMSG_DATA(cmsg), &s->fd, sizeof(int));
 773
 774         l = sendmsg(s->server->notify_fd, &msghdr, MSG_DONTWAIT|MSG_NOSIGNAL);
 775         if (l < 0) {
 776                 if (errno == EAGAIN)
 777                         return;
 778
 779                 log_error_errno(errno, "Failed to send stream file descriptor to service manager: %m");
 780         } else {
 781                 log_debug("Successfully sent stream file descriptor to service manager.");
 782                 s->fdstore = 1;
 783         }
 784
 785         LIST_REMOVE(stdout_stream_notify_queue, s->server->stdout_streams_notify_queue, s);
 786         s->in_notify_queue = false;
 787
 788 }