lib/lws-plat-unix.c

   1 #include "private-libwebsockets.h"
   2
   3 #include <pwd.h>
   4 #include <grp.h>
   5
   6 #ifdef LWS_WITH_PLUGINS
   7 #include <dlfcn.h>
   8 #endif
   9 #include <dirent.h>
  10
  11
  12 /*
  13  * included from libwebsockets.c for unix builds
  14  */
  15
  16 unsigned long long time_in_microseconds(void)
  17 {
  18         struct timeval tv;
  19         gettimeofday(&tv, NULL);
  20         return ((unsigned long long)tv.tv_sec * 1000000LL) + tv.tv_usec;
  21 }
  22
  23 LWS_VISIBLE int
  24 lws_get_random(struct lws_context *context, void *buf, int len)
  25 {
  26         return read(context->fd_random, (char *)buf, len);
  27 }
  28
  29 LWS_VISIBLE int
  30 lws_send_pipe_choked(struct lws *wsi)
  31 {
  32         struct lws_pollfd fds;
  33
  34         /* treat the fact we got a truncated send pending as if we're choked */
  35         if (wsi->trunc_len)
  36                 return 1;
  37
  38         fds.fd = wsi->desc.sockfd;
  39         fds.events = POLLOUT;
  40         fds.revents = 0;
  41
  42         if (poll(&fds, 1, 0) != 1)
  43                 return 1;
  44
  45         if ((fds.revents & POLLOUT) == 0)
  46                 return 1;
  47
  48         /* okay to send another packet without blocking */
  49
  50         return 0;
  51 }
  52
  53 LWS_VISIBLE int
  54 lws_poll_listen_fd(struct lws_pollfd *fd)
  55 {
  56         return poll(fd, 1, 0);
  57 }
  58
  59 LWS_VISIBLE void
  60 lws_cancel_service_pt(struct lws *wsi)
  61 {
  62         struct lws_context_per_thread *pt = &wsi->context->pt[(int)wsi->tsi];
  63         char buf = 0;
  64
  65         if (write(pt->dummy_pipe_fds[1], &buf, sizeof(buf)) != 1)
  66                 lwsl_err("Cannot write to dummy pipe");
  67 }
  68
  69 LWS_VISIBLE void
  70 lws_cancel_service(struct lws_context *context)
  71 {
  72         struct lws_context_per_thread *pt = &context->pt[0];
  73         char buf = 0, m = context->count_threads;
  74
  75         while (m--) {
  76                 if (write(pt->dummy_pipe_fds[1], &buf, sizeof(buf)) != 1)
  77                         lwsl_err("Cannot write to dummy pipe");
  78                 pt++;
  79         }
  80 }
  81
  82 LWS_VISIBLE void lwsl_emit_syslog(int level, const char *line)
  83 {
  84         int syslog_level = LOG_DEBUG;
  85
  86         switch (level) {
  87         case LLL_ERR:
  88                 syslog_level = LOG_ERR;
  89                 break;
  90         case LLL_WARN:
  91                 syslog_level = LOG_WARNING;
  92                 break;
  93         case LLL_NOTICE:
  94                 syslog_level = LOG_NOTICE;
  95                 break;
  96         case LLL_INFO:
  97                 syslog_level = LOG_INFO;
  98                 break;
  99         }
 100         syslog(syslog_level, "%s", line);
 101 }
 102
 103 LWS_VISIBLE LWS_EXTERN int
 104 _lws_plat_service_tsi(struct lws_context *context, int timeout_ms, int tsi)
 105 {
 106         struct lws_context_per_thread *pt;
 107         int n = -1, m, c;
 108         char buf;
 109
 110         /* stay dead once we are dead */
 111
 112         if (!context || !context->vhost_list)
 113                 return 1;
 114
 115         pt = &context->pt[tsi];
 116
 117         lws_stats_atomic_bump(context, pt, LWSSTATS_C_SERVICE_ENTRY, 1);
 118
 119         if (timeout_ms < 0)
 120                 goto faked_service;
 121
 122         lws_libev_run(context, tsi);
 123         lws_libuv_run(context, tsi);
 124         lws_libevent_run(context, tsi);
 125
 126         if (!context->service_tid_detected) {
 127                 struct lws _lws;
 128
 129                 memset(&_lws, 0, sizeof(_lws));
 130                 _lws.context = context;
 131
 132                 context->service_tid_detected =
 133                         context->vhost_list->protocols[0].callback(
 134                         &_lws, LWS_CALLBACK_GET_THREAD_ID, NULL, NULL, 0);
 135         }
 136         context->service_tid = context->service_tid_detected;
 137
 138         /*
 139          * is there anybody with pending stuff that needs service forcing?
 140          */
 141         if (!lws_service_adjust_timeout(context, 1, tsi)) {
 142                 /* -1 timeout means just do forced service */
 143                 _lws_plat_service_tsi(context, -1, pt->tid);
 144                 /* still somebody left who wants forced service? */
 145                 if (!lws_service_adjust_timeout(context, 1, pt->tid))
 146                         /* yes... come back again quickly */
 147                         timeout_ms = 0;
 148         }
 149
 150         n = poll(pt->fds, pt->fds_count, timeout_ms);
 151
 152 #ifdef LWS_OPENSSL_SUPPORT
 153         if (!pt->rx_draining_ext_list &&
 154             !lws_ssl_anybody_has_buffered_read_tsi(context, tsi) && !n) {
 155 #else
 156         if (!pt->rx_draining_ext_list && !n) /* poll timeout */ {
 157 #endif
 158                 lws_service_fd_tsi(context, NULL, tsi);
 159                 return 0;
 160         }
 161
 162 faked_service:
 163         m = lws_service_flag_pending(context, tsi);
 164         if (m)
 165                 c = -1; /* unknown limit */
 166         else
 167                 if (n < 0) {
 168                         if (LWS_ERRNO != LWS_EINTR)
 169                                 return -1;
 170                         return 0;
 171                 } else
 172                         c = n;
 173
 174         /* any socket with events to service? */
 175         for (n = 0; n < pt->fds_count && c; n++) {
 176                 if (!pt->fds[n].revents)
 177                         continue;
 178
 179                 c--;
 180
 181                 if (pt->fds[n].fd == pt->dummy_pipe_fds[0]) {
 182                         if (read(pt->fds[n].fd, &buf, 1) != 1)
 183                                 lwsl_err("Cannot read from dummy pipe.");
 184                         continue;
 185                 }
 186
 187                 m = lws_service_fd_tsi(context, &pt->fds[n], tsi);
 188                 if (m < 0)
 189                         return -1;
 190                 /* if something closed, retry this slot */
 191                 if (m)
 192                         n--;
 193         }
 194
 195         return 0;
 196 }
 197
 198 LWS_VISIBLE int
 199 lws_plat_check_connection_error(struct lws *wsi)
 200 {
 201         return 0;
 202 }
 203
 204 LWS_VISIBLE int
 205 lws_plat_service(struct lws_context *context, int timeout_ms)
 206 {
 207         return _lws_plat_service_tsi(context, timeout_ms, 0);
 208 }
 209
 210 LWS_VISIBLE int
 211 lws_plat_set_socket_options(struct lws_vhost *vhost, int fd)
 212 {
 213         int optval = 1;
 214         socklen_t optlen = sizeof(optval);
 215
 216 #if defined(__APPLE__) || \
 217     defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || \
 218     defined(__NetBSD__) || \
 219     defined(__OpenBSD__)
 220         struct protoent *tcp_proto;
 221 #endif
 222
 223         if (vhost->ka_time) {
 224                 /* enable keepalive on this socket */
 225                 optval = 1;
 226                 if (setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE,
 227                                (const void *)&optval, optlen) < 0)
 228                         return 1;
 229
 230 #if defined(__APPLE__) || \
 231     defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || \
 232     defined(__NetBSD__) || \
 233         defined(__CYGWIN__) || defined(__OpenBSD__) || defined (__sun)
 234
 235                 /*
 236                  * didn't find a way to set these per-socket, need to
 237                  * tune kernel systemwide values
 238                  */
 239 #else
 240                 /* set the keepalive conditions we want on it too */
 241                 optval = vhost->ka_time;
 242                 if (setsockopt(fd, IPPROTO_TCP, TCP_KEEPIDLE,
 243                                (const void *)&optval, optlen) < 0)
 244                         return 1;
 245
 246                 optval = vhost->ka_interval;
 247                 if (setsockopt(fd, IPPROTO_TCP, TCP_KEEPINTVL,
 248                                (const void *)&optval, optlen) < 0)
 249                         return 1;
 250
 251                 optval = vhost->ka_probes;
 252                 if (setsockopt(fd, IPPROTO_TCP, TCP_KEEPCNT,
 253                                (const void *)&optval, optlen) < 0)
 254                         return 1;
 255 #endif
 256         }
 257
 258         /* Disable Nagle */
 259         optval = 1;
 260 #if defined (__sun)
 261         if (setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, (const void *)&optval, optlen) < 0)
 262                 return 1;
 263 #elif !defined(__APPLE__) && \
 264       !defined(__FreeBSD__) && !defined(__FreeBSD_kernel__) &&        \
 265       !defined(__NetBSD__) && \
 266       !defined(__OpenBSD__)
 267         if (setsockopt(fd, SOL_TCP, TCP_NODELAY, (const void *)&optval, optlen) < 0)
 268                 return 1;
 269 #else
 270         tcp_proto = getprotobyname("TCP");
 271         if (setsockopt(fd, tcp_proto->p_proto, TCP_NODELAY, &optval, optlen) < 0)
 272                 return 1;
 273 #endif
 274
 275         /* We are nonblocking... */
 276         if (fcntl(fd, F_SETFL, O_NONBLOCK) < 0)
 277                 return 1;
 278
 279         return 0;
 280 }
 281
 282 LWS_VISIBLE void
 283 lws_plat_drop_app_privileges(struct lws_context_creation_info *info)
 284 {
 285         if (info->gid != -1)
 286                 if (setgid(info->gid))
 287                         lwsl_warn("setgid: %s\n", strerror(LWS_ERRNO));
 288
 289         if (info->uid != -1) {
 290                 struct passwd *p = getpwuid(info->uid);
 291
 292                 if (p) {
 293                         initgroups(p->pw_name, info->gid);
 294                         if (setuid(info->uid))
 295                                 lwsl_warn("setuid: %s\n", strerror(LWS_ERRNO));
 296                         else
 297                                 lwsl_notice("Set privs to user '%s'\n", p->pw_name);
 298                 } else
 299                         lwsl_warn("getpwuid: unable to find uid %d", info->uid);
 300         }
 301 }
 302
 303 #ifdef LWS_WITH_PLUGINS
 304
 305 #if defined(LWS_USE_LIBUV) && UV_VERSION_MAJOR > 0
 306
 307 /* libuv.c implements these in a cross-platform way */
 308
 309 #else
 310
 311 static int filter(const struct dirent *ent)
 312 {
 313         if (!strcmp(ent->d_name, ".") || !strcmp(ent->d_name, ".."))
 314                 return 0;
 315
 316         return 1;
 317 }
 318
 319 LWS_VISIBLE int
 320 lws_plat_plugins_init(struct lws_context * context, const char * const *d)
 321 {
 322         struct lws_plugin_capability lcaps;
 323         struct lws_plugin *plugin;
 324         lws_plugin_init_func initfunc;
 325         struct dirent **namelist;
 326         int n, i, m, ret = 0;
 327         char path[256];
 328         void *l;
 329
 330         lwsl_notice("  Plugins:\n");
 331
 332         while (d && *d) {
 333                 n = scandir(*d, &namelist, filter, alphasort);
 334                 if (n < 0) {
 335                         lwsl_err("Scandir on %s failed\n", *d);
 336                         return 1;
 337                 }
 338
 339                 for (i = 0; i < n; i++) {
 340                         if (strlen(namelist[i]->d_name) < 7)
 341                                 goto inval;
 342
 343                         lwsl_notice("   %s\n", namelist[i]->d_name);
 344
 345                         lws_snprintf(path, sizeof(path) - 1, "%s/%s", *d,
 346                                  namelist[i]->d_name);
 347                         l = dlopen(path, RTLD_NOW);
 348                         if (!l) {
 349                                 lwsl_err("Error loading DSO: %s\n", dlerror());
 350                                 while (i++ < n)
 351                                         free(namelist[i]);
 352                                 goto bail;
 353                         }
 354                         /* we could open it, can we get his init function? */
 355                         m = lws_snprintf(path, sizeof(path) - 1, "init_%s",
 356                                      namelist[i]->d_name + 3 /* snip lib... */);
 357                         path[m - 3] = '\0'; /* snip the .so */
 358                         initfunc = dlsym(l, path);
 359                         if (!initfunc) {
 360                                 lwsl_err("Failed to get init on %s: %s",
 361                                                 namelist[i]->d_name, dlerror());
 362                                 dlclose(l);
 363                         }
 364                         lcaps.api_magic = LWS_PLUGIN_API_MAGIC;
 365                         m = initfunc(context, &lcaps);
 366                         if (m) {
 367                                 lwsl_err("Initializing %s failed %d\n",
 368                                         namelist[i]->d_name, m);
 369                                 dlclose(l);
 370                                 goto skip;
 371                         }
 372
 373                         plugin = lws_malloc(sizeof(*plugin));
 374                         if (!plugin) {
 375                                 lwsl_err("OOM\n");
 376                                 goto bail;
 377                         }
 378                         plugin->list = context->plugin_list;
 379                         context->plugin_list = plugin;
 380                         strncpy(plugin->name, namelist[i]->d_name, sizeof(plugin->name) - 1);
 381                         plugin->name[sizeof(plugin->name) - 1] = '\0';
 382                         plugin->l = l;
 383                         plugin->caps = lcaps;
 384                         context->plugin_protocol_count += lcaps.count_protocols;
 385                         context->plugin_extension_count += lcaps.count_extensions;
 386
 387                         free(namelist[i]);
 388                         continue;
 389
 390         skip:
 391                         dlclose(l);
 392         inval:
 393                         free(namelist[i]);
 394                 }
 395                 free(namelist);
 396                 d++;
 397         }
 398
 399 bail:
 400         free(namelist);
 401
 402         return ret;
 403 }
 404
 405 LWS_VISIBLE int
 406 lws_plat_plugins_destroy(struct lws_context * context)
 407 {
 408         struct lws_plugin *plugin = context->plugin_list, *p;
 409         lws_plugin_destroy_func func;
 410         char path[256];
 411         int m;
 412
 413         if (!plugin)
 414                 return 0;
 415
 416         lwsl_notice("%s\n", __func__);
 417
 418         while (plugin) {
 419                 p = plugin;
 420                 m = lws_snprintf(path, sizeof(path) - 1, "destroy_%s", plugin->name + 3);
 421                 path[m - 3] = '\0';
 422                 func = dlsym(plugin->l, path);
 423                 if (!func) {
 424                         lwsl_err("Failed to get destroy on %s: %s",
 425                                         plugin->name, dlerror());
 426                         goto next;
 427                 }
 428                 m = func(context);
 429                 if (m)
 430                         lwsl_err("Initializing %s failed %d\n",
 431                                 plugin->name, m);
 432 next:
 433                 dlclose(p->l);
 434                 plugin = p->list;
 435                 p->list = NULL;
 436                 free(p);
 437         }
 438
 439         context->plugin_list = NULL;
 440
 441         return 0;
 442 }
 443
 444 #endif
 445 #endif
 446
 447
 448 #if 0
 449 static void
 450 sigabrt_handler(int x)
 451 {
 452         printf("%s\n", __func__);
 453         //*(char *)0 = 0;
 454 }
 455 #endif
 456
 457 LWS_VISIBLE int
 458 lws_plat_context_early_init(void)
 459 {
 460 #if !defined(LWS_AVOID_SIGPIPE_IGN)
 461         signal(SIGPIPE, SIG_IGN);
 462 #endif
 463
 464 //      signal(SIGABRT, sigabrt_handler);
 465
 466         return 0;
 467 }
 468
 469 LWS_VISIBLE void
 470 lws_plat_context_early_destroy(struct lws_context *context)
 471 {
 472 }
 473
 474 LWS_VISIBLE void
 475 lws_plat_context_late_destroy(struct lws_context *context)
 476 {
 477         struct lws_context_per_thread *pt = &context->pt[0];
 478         int m = context->count_threads;
 479
 480 #ifdef LWS_WITH_PLUGINS
 481         if (context->plugin_list)
 482                 lws_plat_plugins_destroy(context);
 483 #endif
 484
 485         if (context->lws_lookup)
 486                 lws_free(context->lws_lookup);
 487
 488         while (m--) {
 489                 if (pt->dummy_pipe_fds[0])
 490                         close(pt->dummy_pipe_fds[0]);
 491                 if (pt->dummy_pipe_fds[1])
 492                         close(pt->dummy_pipe_fds[1]);
 493                 pt++;
 494         }
 495         if (!context->fd_random)
 496                 lwsl_err("ZERO RANDOM FD\n");
 497         if (context->fd_random != LWS_INVALID_FILE)
 498                 close(context->fd_random);
 499 }
 500
 501 /* cast a struct sockaddr_in6 * into addr for ipv6 */
 502
 503 LWS_VISIBLE int
 504 lws_interface_to_sa(int ipv6, const char *ifname, struct sockaddr_in *addr,
 505                     size_t addrlen)
 506 {
 507         int rc = -1;
 508
 509         struct ifaddrs *ifr;
 510         struct ifaddrs *ifc;
 511 #ifdef LWS_USE_IPV6
 512         struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)addr;
 513 #endif
 514
 515         getifaddrs(&ifr);
 516         for (ifc = ifr; ifc != NULL && rc; ifc = ifc->ifa_next) {
 517                 if (!ifc->ifa_addr)
 518                         continue;
 519
 520                 lwsl_info(" interface %s vs %s\n", ifc->ifa_name, ifname);
 521
 522                 if (strcmp(ifc->ifa_name, ifname))
 523                         continue;
 524
 525                 switch (ifc->ifa_addr->sa_family) {
 526                 case AF_INET:
 527 #ifdef LWS_USE_IPV6
 528                         if (ipv6) {
 529                                 /* map IPv4 to IPv6 */
 530                                 bzero((char *)&addr6->sin6_addr,
 531                                                 sizeof(struct in6_addr));
 532                                 addr6->sin6_addr.s6_addr[10] = 0xff;
 533                                 addr6->sin6_addr.s6_addr[11] = 0xff;
 534                                 memcpy(&addr6->sin6_addr.s6_addr[12],
 535                                         &((struct sockaddr_in *)ifc->ifa_addr)->sin_addr,
 536                                                         sizeof(struct in_addr));
 537                         } else
 538 #endif
 539                                 memcpy(addr,
 540                                         (struct sockaddr_in *)ifc->ifa_addr,
 541                                                     sizeof(struct sockaddr_in));
 542                         break;
 543 #ifdef LWS_USE_IPV6
 544                 case AF_INET6:
 545                         memcpy(&addr6->sin6_addr,
 546                           &((struct sockaddr_in6 *)ifc->ifa_addr)->sin6_addr,
 547                                                        sizeof(struct in6_addr));
 548                         break;
 549 #endif
 550                 default:
 551                         continue;
 552                 }
 553                 rc = 0;
 554         }
 555
 556         freeifaddrs(ifr);
 557
 558         if (rc == -1) {
 559                 /* check if bind to IP address */
 560 #ifdef LWS_USE_IPV6
 561                 if (inet_pton(AF_INET6, ifname, &addr6->sin6_addr) == 1)
 562                         rc = 0;
 563                 else
 564 #endif
 565                 if (inet_pton(AF_INET, ifname, &addr->sin_addr) == 1)
 566                         rc = 0;
 567         }
 568
 569         return rc;
 570 }
 571
 572 LWS_VISIBLE void
 573 lws_plat_insert_socket_into_fds(struct lws_context *context, struct lws *wsi)
 574 {
 575         struct lws_context_per_thread *pt = &context->pt[(int)wsi->tsi];
 576
 577         lws_libev_io(wsi, LWS_EV_START | LWS_EV_READ);
 578         lws_libuv_io(wsi, LWS_EV_START | LWS_EV_READ);
 579         lws_libevent_io(wsi, LWS_EV_START | LWS_EV_READ);
 580
 581         pt->fds[pt->fds_count++].revents = 0;
 582 }
 583
 584 LWS_VISIBLE void
 585 lws_plat_delete_socket_from_fds(struct lws_context *context,
 586                                                 struct lws *wsi, int m)
 587 {
 588         struct lws_context_per_thread *pt = &context->pt[(int)wsi->tsi];
 589
 590         lws_libev_io(wsi, LWS_EV_STOP | LWS_EV_READ | LWS_EV_WRITE);
 591         lws_libuv_io(wsi, LWS_EV_STOP | LWS_EV_READ | LWS_EV_WRITE);
 592         lws_libevent_io(wsi, LWS_EV_STOP | LWS_EV_READ | LWS_EV_WRITE);
 593
 594         pt->fds_count--;
 595 }
 596
 597 LWS_VISIBLE void
 598 lws_plat_service_periodic(struct lws_context *context)
 599 {
 600         /* if our parent went down, don't linger around */
 601         if (context->started_with_parent &&
 602             kill(context->started_with_parent, 0) < 0)
 603                 kill(getpid(), SIGTERM);
 604 }
 605
 606 LWS_VISIBLE int
 607 lws_plat_change_pollfd(struct lws_context *context,
 608                       struct lws *wsi, struct lws_pollfd *pfd)
 609 {
 610         return 0;
 611 }
 612
 613 LWS_VISIBLE const char *
 614 lws_plat_inet_ntop(int af, const void *src, char *dst, int cnt)
 615 {
 616         return inet_ntop(af, src, dst, cnt);
 617 }
 618
 619 LWS_VISIBLE lws_fop_fd_t
 620 _lws_plat_file_open(const struct lws_plat_file_ops *fops, const char *filename,
 621                     const char *vpath, lws_fop_flags_t *flags)
 622 {
 623         struct stat stat_buf;
 624         int ret = open(filename, (*flags) & LWS_FOP_FLAGS_MASK, 0664);
 625         lws_fop_fd_t fop_fd;
 626
 627         if (ret < 0)
 628                 return NULL;
 629
 630         if (fstat(ret, &stat_buf) < 0)
 631                 goto bail;
 632
 633         fop_fd = malloc(sizeof(*fop_fd));
 634         if (!fop_fd)
 635                 goto bail;
 636
 637         fop_fd->fops = fops;
 638         fop_fd->flags = *flags;
 639         fop_fd->fd = ret;
 640         fop_fd->filesystem_priv = NULL; /* we don't use it */
 641         fop_fd->len = stat_buf.st_size;
 642         fop_fd->pos = 0;
 643
 644         return fop_fd;
 645
 646 bail:
 647         close(ret);
 648         return NULL;
 649 }
 650
 651 LWS_VISIBLE int
 652 _lws_plat_file_close(lws_fop_fd_t *fop_fd)
 653 {
 654         int fd = (*fop_fd)->fd;
 655
 656         free(*fop_fd);
 657         *fop_fd = NULL;
 658
 659         return close(fd);
 660 }
 661
 662 LWS_VISIBLE lws_fileofs_t
 663 _lws_plat_file_seek_cur(lws_fop_fd_t fop_fd, lws_fileofs_t offset)
 664 {
 665         lws_fileofs_t r;
 666
 667         if (offset > 0 && offset > fop_fd->len - fop_fd->pos)
 668                 offset = fop_fd->len - fop_fd->pos;
 669
 670         if ((lws_fileofs_t)fop_fd->pos + offset < 0)
 671                 offset = -fop_fd->pos;
 672
 673         r = lseek(fop_fd->fd, offset, SEEK_CUR);
 674
 675         if (r >= 0)
 676                 fop_fd->pos = r;
 677         else
 678                 lwsl_err("error seeking from cur %ld, offset %ld\n",
 679                         (long)fop_fd->pos, (long)offset);
 680
 681         return r;
 682 }
 683
 684 LWS_VISIBLE int
 685 _lws_plat_file_read(lws_fop_fd_t fop_fd, lws_filepos_t *amount,
 686                     uint8_t *buf, lws_filepos_t len)
 687 {
 688         long n;
 689
 690         n = read((int)fop_fd->fd, buf, len);
 691         if (n == -1) {
 692                 *amount = 0;
 693                 return -1;
 694         }
 695         fop_fd->pos += n;
 696         lwsl_debug("%s: read %ld of req %ld, pos %ld, len %ld\n", __func__, n,
 697                   (long)len, (long)fop_fd->pos, (long)fop_fd->len);
 698         *amount = n;
 699
 700         return 0;
 701 }
 702
 703 LWS_VISIBLE int
 704 _lws_plat_file_write(lws_fop_fd_t fop_fd, lws_filepos_t *amount,
 705                      uint8_t *buf, lws_filepos_t len)
 706 {
 707         long n;
 708
 709         n = write((int)fop_fd->fd, buf, len);
 710         if (n == -1) {
 711                 *amount = 0;
 712                 return -1;
 713         }
 714
 715         fop_fd->pos += n;
 716         *amount = n;
 717
 718         return 0;
 719 }
 720
 721
 722 LWS_VISIBLE int
 723 lws_plat_init(struct lws_context *context,
 724               struct lws_context_creation_info *info)
 725 {
 726         struct lws_context_per_thread *pt = &context->pt[0];
 727         int n = context->count_threads, fd;
 728
 729         /* master context has the global fd lookup array */
 730         context->lws_lookup = lws_zalloc(sizeof(struct lws *) *
 731                                          context->max_fds);
 732         if (context->lws_lookup == NULL) {
 733                 lwsl_err("OOM on lws_lookup array for %d connections\n",
 734                          context->max_fds);
 735                 return 1;
 736         }
 737
 738         lwsl_notice(" mem: platform fd map: %5lu bytes\n",
 739                     (unsigned long)(sizeof(struct lws *) * context->max_fds));
 740         fd = open(SYSTEM_RANDOM_FILEPATH, O_RDONLY);
 741
 742         context->fd_random = fd;
 743         if (context->fd_random < 0) {
 744                 lwsl_err("Unable to open random device %s %d\n",
 745                          SYSTEM_RANDOM_FILEPATH, context->fd_random);
 746                 return 1;
 747         }
 748
 749         if (!lws_libev_init_fd_table(context) &&
 750             !lws_libuv_init_fd_table(context) &&
 751             !lws_libevent_init_fd_table(context)) {
 752                 /* otherwise libev handled it instead */
 753
 754                 while (n--) {
 755                         if (pipe(pt->dummy_pipe_fds)) {
 756                                 lwsl_err("Unable to create pipe\n");
 757                                 return 1;
 758                         }
 759
 760                         /* use the read end of pipe as first item */
 761                         pt->fds[0].fd = pt->dummy_pipe_fds[0];
 762                         pt->fds[0].events = LWS_POLLIN;
 763                         pt->fds[0].revents = 0;
 764                         pt->fds_count = 1;
 765                         pt++;
 766                 }
 767         }
 768
 769 #ifdef LWS_WITH_PLUGINS
 770         if (info->plugin_dirs)
 771                 lws_plat_plugins_init(context, info->plugin_dirs);
 772 #endif
 773
 774         return 0;
 775 }