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 #if defined(LWS_HAVE_SYS_CAPABILITY_H) && defined(LWS_HAVE_LIBCAP)
 283 static void
 284 _lws_plat_apply_caps(int mode, cap_value_t *cv, int count)
 285 {
 286         cap_t caps = cap_get_proc();
 287
 288         if (!count)
 289                 return;
 290
 291         cap_set_flag(caps, mode, count, cv, CAP_SET);
 292         cap_set_proc(caps);
 293         prctl(PR_SET_KEEPCAPS, 1, 0, 0, 0);
 294         cap_free(caps);
 295 }
 296 #endif
 297
 298 LWS_VISIBLE void
 299 lws_plat_drop_app_privileges(struct lws_context_creation_info *info)
 300 {
 301 #if defined(LWS_HAVE_SYS_CAPABILITY_H) && defined(LWS_HAVE_LIBCAP)
 302         int n;
 303 #endif
 304
 305         if (info->gid != -1)
 306                 if (setgid(info->gid))
 307                         lwsl_warn("setgid: %s\n", strerror(LWS_ERRNO));
 308
 309         if (info->uid != -1) {
 310                 struct passwd *p = getpwuid(info->uid);
 311
 312                 if (p) {
 313
 314 #if defined(LWS_HAVE_SYS_CAPABILITY_H) && defined(LWS_HAVE_LIBCAP)
 315                         _lws_plat_apply_caps(CAP_PERMITTED, info->caps, info->count_caps);
 316 #endif
 317
 318                         initgroups(p->pw_name, info->gid);
 319                         if (setuid(info->uid))
 320                                 lwsl_warn("setuid: %s\n", strerror(LWS_ERRNO));
 321                         else
 322                                 lwsl_notice("Set privs to user '%s'\n", p->pw_name);
 323
 324 #if defined(LWS_HAVE_SYS_CAPABILITY_H) && defined(LWS_HAVE_LIBCAP)
 325                         _lws_plat_apply_caps(CAP_EFFECTIVE, info->caps, info->count_caps);
 326
 327                         if (info->count_caps)
 328                                 for (n = 0; n < info->count_caps; n++)
 329                                         lwsl_notice("   RETAINING CAPABILITY %d\n", (int)info->caps[n]);
 330 #endif
 331
 332                 } else
 333                         lwsl_warn("getpwuid: unable to find uid %d", info->uid);
 334         }
 335 }
 336
 337 #ifdef LWS_WITH_PLUGINS
 338
 339 #if defined(LWS_USE_LIBUV) && UV_VERSION_MAJOR > 0
 340
 341 /* libuv.c implements these in a cross-platform way */
 342
 343 #else
 344
 345 static int filter(const struct dirent *ent)
 346 {
 347         if (!strcmp(ent->d_name, ".") || !strcmp(ent->d_name, ".."))
 348                 return 0;
 349
 350         return 1;
 351 }
 352
 353 LWS_VISIBLE int
 354 lws_plat_plugins_init(struct lws_context * context, const char * const *d)
 355 {
 356         struct lws_plugin_capability lcaps;
 357         struct lws_plugin *plugin;
 358         lws_plugin_init_func initfunc;
 359         struct dirent **namelist;
 360         int n, i, m, ret = 0;
 361         char path[256];
 362         void *l;
 363
 364         lwsl_notice("  Plugins:\n");
 365
 366         while (d && *d) {
 367                 n = scandir(*d, &namelist, filter, alphasort);
 368                 if (n < 0) {
 369                         lwsl_err("Scandir on %s failed\n", *d);
 370                         return 1;
 371                 }
 372
 373                 for (i = 0; i < n; i++) {
 374                         if (strlen(namelist[i]->d_name) < 7)
 375                                 goto inval;
 376
 377                         lwsl_notice("   %s\n", namelist[i]->d_name);
 378
 379                         lws_snprintf(path, sizeof(path) - 1, "%s/%s", *d,
 380                                  namelist[i]->d_name);
 381                         l = dlopen(path, RTLD_NOW);
 382                         if (!l) {
 383                                 lwsl_err("Error loading DSO: %s\n", dlerror());
 384                                 while (i++ < n)
 385                                         free(namelist[i]);
 386                                 goto bail;
 387                         }
 388                         /* we could open it, can we get his init function? */
 389                         m = lws_snprintf(path, sizeof(path) - 1, "init_%s",
 390                                      namelist[i]->d_name + 3 /* snip lib... */);
 391                         path[m - 3] = '\0'; /* snip the .so */
 392                         initfunc = dlsym(l, path);
 393                         if (!initfunc) {
 394                                 lwsl_err("Failed to get init on %s: %s",
 395                                                 namelist[i]->d_name, dlerror());
 396                                 dlclose(l);
 397                         }
 398                         lcaps.api_magic = LWS_PLUGIN_API_MAGIC;
 399                         m = initfunc(context, &lcaps);
 400                         if (m) {
 401                                 lwsl_err("Initializing %s failed %d\n",
 402                                         namelist[i]->d_name, m);
 403                                 dlclose(l);
 404                                 goto skip;
 405                         }
 406
 407                         plugin = lws_malloc(sizeof(*plugin));
 408                         if (!plugin) {
 409                                 lwsl_err("OOM\n");
 410                                 goto bail;
 411                         }
 412                         plugin->list = context->plugin_list;
 413                         context->plugin_list = plugin;
 414                         strncpy(plugin->name, namelist[i]->d_name, sizeof(plugin->name) - 1);
 415                         plugin->name[sizeof(plugin->name) - 1] = '\0';
 416                         plugin->l = l;
 417                         plugin->caps = lcaps;
 418                         context->plugin_protocol_count += lcaps.count_protocols;
 419                         context->plugin_extension_count += lcaps.count_extensions;
 420
 421                         free(namelist[i]);
 422                         continue;
 423
 424         skip:
 425                         dlclose(l);
 426         inval:
 427                         free(namelist[i]);
 428                 }
 429                 free(namelist);
 430                 d++;
 431         }
 432
 433 bail:
 434         free(namelist);
 435
 436         return ret;
 437 }
 438
 439 LWS_VISIBLE int
 440 lws_plat_plugins_destroy(struct lws_context * context)
 441 {
 442         struct lws_plugin *plugin = context->plugin_list, *p;
 443         lws_plugin_destroy_func func;
 444         char path[256];
 445         int m;
 446
 447         if (!plugin)
 448                 return 0;
 449
 450         lwsl_notice("%s\n", __func__);
 451
 452         while (plugin) {
 453                 p = plugin;
 454                 m = lws_snprintf(path, sizeof(path) - 1, "destroy_%s", plugin->name + 3);
 455                 path[m - 3] = '\0';
 456                 func = dlsym(plugin->l, path);
 457                 if (!func) {
 458                         lwsl_err("Failed to get destroy on %s: %s",
 459                                         plugin->name, dlerror());
 460                         goto next;
 461                 }
 462                 m = func(context);
 463                 if (m)
 464                         lwsl_err("Initializing %s failed %d\n",
 465                                 plugin->name, m);
 466 next:
 467                 dlclose(p->l);
 468                 plugin = p->list;
 469                 p->list = NULL;
 470                 free(p);
 471         }
 472
 473         context->plugin_list = NULL;
 474
 475         return 0;
 476 }
 477
 478 #endif
 479 #endif
 480
 481
 482 #if 0
 483 static void
 484 sigabrt_handler(int x)
 485 {
 486         printf("%s\n", __func__);
 487         //*(char *)0 = 0;
 488 }
 489 #endif
 490
 491 LWS_VISIBLE int
 492 lws_plat_context_early_init(void)
 493 {
 494 #if !defined(LWS_AVOID_SIGPIPE_IGN)
 495         signal(SIGPIPE, SIG_IGN);
 496 #endif
 497
 498 //      signal(SIGABRT, sigabrt_handler);
 499
 500         return 0;
 501 }
 502
 503 LWS_VISIBLE void
 504 lws_plat_context_early_destroy(struct lws_context *context)
 505 {
 506 }
 507
 508 LWS_VISIBLE void
 509 lws_plat_context_late_destroy(struct lws_context *context)
 510 {
 511         struct lws_context_per_thread *pt = &context->pt[0];
 512         int m = context->count_threads;
 513
 514 #ifdef LWS_WITH_PLUGINS
 515         if (context->plugin_list)
 516                 lws_plat_plugins_destroy(context);
 517 #endif
 518
 519         if (context->lws_lookup)
 520                 lws_free(context->lws_lookup);
 521
 522         while (m--) {
 523                 if (pt->dummy_pipe_fds[0])
 524                         close(pt->dummy_pipe_fds[0]);
 525                 if (pt->dummy_pipe_fds[1])
 526                         close(pt->dummy_pipe_fds[1]);
 527                 pt++;
 528         }
 529         if (!context->fd_random)
 530                 lwsl_err("ZERO RANDOM FD\n");
 531         if (context->fd_random != LWS_INVALID_FILE)
 532                 close(context->fd_random);
 533 }
 534
 535 /* cast a struct sockaddr_in6 * into addr for ipv6 */
 536
 537 LWS_VISIBLE int
 538 lws_interface_to_sa(int ipv6, const char *ifname, struct sockaddr_in *addr,
 539                     size_t addrlen)
 540 {
 541         int rc = -1;
 542
 543         struct ifaddrs *ifr;
 544         struct ifaddrs *ifc;
 545 #ifdef LWS_USE_IPV6
 546         struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)addr;
 547 #endif
 548
 549         getifaddrs(&ifr);
 550         for (ifc = ifr; ifc != NULL && rc; ifc = ifc->ifa_next) {
 551                 if (!ifc->ifa_addr)
 552                         continue;
 553
 554                 lwsl_info(" interface %s vs %s\n", ifc->ifa_name, ifname);
 555
 556                 if (strcmp(ifc->ifa_name, ifname))
 557                         continue;
 558
 559                 switch (ifc->ifa_addr->sa_family) {
 560                 case AF_INET:
 561 #ifdef LWS_USE_IPV6
 562                         if (ipv6) {
 563                                 /* map IPv4 to IPv6 */
 564                                 bzero((char *)&addr6->sin6_addr,
 565                                                 sizeof(struct in6_addr));
 566                                 addr6->sin6_addr.s6_addr[10] = 0xff;
 567                                 addr6->sin6_addr.s6_addr[11] = 0xff;
 568                                 memcpy(&addr6->sin6_addr.s6_addr[12],
 569                                         &((struct sockaddr_in *)ifc->ifa_addr)->sin_addr,
 570                                                         sizeof(struct in_addr));
 571                         } else
 572 #endif
 573                                 memcpy(addr,
 574                                         (struct sockaddr_in *)ifc->ifa_addr,
 575                                                     sizeof(struct sockaddr_in));
 576                         break;
 577 #ifdef LWS_USE_IPV6
 578                 case AF_INET6:
 579                         memcpy(&addr6->sin6_addr,
 580                           &((struct sockaddr_in6 *)ifc->ifa_addr)->sin6_addr,
 581                                                        sizeof(struct in6_addr));
 582                         break;
 583 #endif
 584                 default:
 585                         continue;
 586                 }
 587                 rc = 0;
 588         }
 589
 590         freeifaddrs(ifr);
 591
 592         if (rc == -1) {
 593                 /* check if bind to IP address */
 594 #ifdef LWS_USE_IPV6
 595                 if (inet_pton(AF_INET6, ifname, &addr6->sin6_addr) == 1)
 596                         rc = 0;
 597                 else
 598 #endif
 599                 if (inet_pton(AF_INET, ifname, &addr->sin_addr) == 1)
 600                         rc = 0;
 601         }
 602
 603         return rc;
 604 }
 605
 606 LWS_VISIBLE void
 607 lws_plat_insert_socket_into_fds(struct lws_context *context, struct lws *wsi)
 608 {
 609         struct lws_context_per_thread *pt = &context->pt[(int)wsi->tsi];
 610
 611         lws_libev_io(wsi, LWS_EV_START | LWS_EV_READ);
 612         lws_libuv_io(wsi, LWS_EV_START | LWS_EV_READ);
 613         lws_libevent_io(wsi, LWS_EV_START | LWS_EV_READ);
 614
 615         pt->fds[pt->fds_count++].revents = 0;
 616 }
 617
 618 LWS_VISIBLE void
 619 lws_plat_delete_socket_from_fds(struct lws_context *context,
 620                                                 struct lws *wsi, int m)
 621 {
 622         struct lws_context_per_thread *pt = &context->pt[(int)wsi->tsi];
 623
 624         lws_libev_io(wsi, LWS_EV_STOP | LWS_EV_READ | LWS_EV_WRITE);
 625         lws_libuv_io(wsi, LWS_EV_STOP | LWS_EV_READ | LWS_EV_WRITE);
 626         lws_libevent_io(wsi, LWS_EV_STOP | LWS_EV_READ | LWS_EV_WRITE);
 627
 628         pt->fds_count--;
 629 }
 630
 631 LWS_VISIBLE void
 632 lws_plat_service_periodic(struct lws_context *context)
 633 {
 634         /* if our parent went down, don't linger around */
 635         if (context->started_with_parent &&
 636             kill(context->started_with_parent, 0) < 0)
 637                 kill(getpid(), SIGTERM);
 638 }
 639
 640 LWS_VISIBLE int
 641 lws_plat_change_pollfd(struct lws_context *context,
 642                       struct lws *wsi, struct lws_pollfd *pfd)
 643 {
 644         return 0;
 645 }
 646
 647 LWS_VISIBLE const char *
 648 lws_plat_inet_ntop(int af, const void *src, char *dst, int cnt)
 649 {
 650         return inet_ntop(af, src, dst, cnt);
 651 }
 652
 653 LWS_VISIBLE int
 654 lws_plat_inet_pton(int af, const char *src, void *dst)
 655 {
 656         return inet_pton(af, src, dst);
 657 }
 658
 659 LWS_VISIBLE lws_fop_fd_t
 660 _lws_plat_file_open(const struct lws_plat_file_ops *fops, const char *filename,
 661                     const char *vpath, lws_fop_flags_t *flags)
 662 {
 663         struct stat stat_buf;
 664         int ret = open(filename, (*flags) & LWS_FOP_FLAGS_MASK, 0664);
 665         lws_fop_fd_t fop_fd;
 666
 667         if (ret < 0)
 668                 return NULL;
 669
 670         if (fstat(ret, &stat_buf) < 0)
 671                 goto bail;
 672
 673         fop_fd = malloc(sizeof(*fop_fd));
 674         if (!fop_fd)
 675                 goto bail;
 676
 677         fop_fd->fops = fops;
 678         fop_fd->flags = *flags;
 679         fop_fd->fd = ret;
 680         fop_fd->filesystem_priv = NULL; /* we don't use it */
 681         fop_fd->len = stat_buf.st_size;
 682         fop_fd->pos = 0;
 683
 684         return fop_fd;
 685
 686 bail:
 687         close(ret);
 688         return NULL;
 689 }
 690
 691 LWS_VISIBLE int
 692 _lws_plat_file_close(lws_fop_fd_t *fop_fd)
 693 {
 694         int fd = (*fop_fd)->fd;
 695
 696         free(*fop_fd);
 697         *fop_fd = NULL;
 698
 699         return close(fd);
 700 }
 701
 702 LWS_VISIBLE lws_fileofs_t
 703 _lws_plat_file_seek_cur(lws_fop_fd_t fop_fd, lws_fileofs_t offset)
 704 {
 705         lws_fileofs_t r;
 706
 707         if (offset > 0 && offset > fop_fd->len - fop_fd->pos)
 708                 offset = fop_fd->len - fop_fd->pos;
 709
 710         if ((lws_fileofs_t)fop_fd->pos + offset < 0)
 711                 offset = -fop_fd->pos;
 712
 713         r = lseek(fop_fd->fd, offset, SEEK_CUR);
 714
 715         if (r >= 0)
 716                 fop_fd->pos = r;
 717         else
 718                 lwsl_err("error seeking from cur %ld, offset %ld\n",
 719                         (long)fop_fd->pos, (long)offset);
 720
 721         return r;
 722 }
 723
 724 LWS_VISIBLE int
 725 _lws_plat_file_read(lws_fop_fd_t fop_fd, lws_filepos_t *amount,
 726                     uint8_t *buf, lws_filepos_t len)
 727 {
 728         long n;
 729
 730         n = read((int)fop_fd->fd, buf, len);
 731         if (n == -1) {
 732                 *amount = 0;
 733                 return -1;
 734         }
 735         fop_fd->pos += n;
 736         lwsl_debug("%s: read %ld of req %ld, pos %ld, len %ld\n", __func__, n,
 737                   (long)len, (long)fop_fd->pos, (long)fop_fd->len);
 738         *amount = n;
 739
 740         return 0;
 741 }
 742
 743 LWS_VISIBLE int
 744 _lws_plat_file_write(lws_fop_fd_t fop_fd, lws_filepos_t *amount,
 745                      uint8_t *buf, lws_filepos_t len)
 746 {
 747         long n;
 748
 749         n = write((int)fop_fd->fd, buf, len);
 750         if (n == -1) {
 751                 *amount = 0;
 752                 return -1;
 753         }
 754
 755         fop_fd->pos += n;
 756         *amount = n;
 757
 758         return 0;
 759 }
 760
 761
 762 LWS_VISIBLE int
 763 lws_plat_init(struct lws_context *context,
 764               struct lws_context_creation_info *info)
 765 {
 766         struct lws_context_per_thread *pt = &context->pt[0];
 767         int n = context->count_threads, fd;
 768
 769         /* master context has the global fd lookup array */
 770         context->lws_lookup = lws_zalloc(sizeof(struct lws *) *
 771                                          context->max_fds);
 772         if (context->lws_lookup == NULL) {
 773                 lwsl_err("OOM on lws_lookup array for %d connections\n",
 774                          context->max_fds);
 775                 return 1;
 776         }
 777
 778         lwsl_notice(" mem: platform fd map: %5lu bytes\n",
 779                     (unsigned long)(sizeof(struct lws *) * context->max_fds));
 780         fd = open(SYSTEM_RANDOM_FILEPATH, O_RDONLY);
 781
 782         context->fd_random = fd;
 783         if (context->fd_random < 0) {
 784                 lwsl_err("Unable to open random device %s %d\n",
 785                          SYSTEM_RANDOM_FILEPATH, context->fd_random);
 786                 return 1;
 787         }
 788
 789         if (!lws_libev_init_fd_table(context) &&
 790             !lws_libuv_init_fd_table(context) &&
 791             !lws_libevent_init_fd_table(context)) {
 792                 /* otherwise libev handled it instead */
 793
 794                 while (n--) {
 795                         if (pipe(pt->dummy_pipe_fds)) {
 796                                 lwsl_err("Unable to create pipe\n");
 797                                 return 1;
 798                         }
 799
 800                         /* use the read end of pipe as first item */
 801                         pt->fds[0].fd = pt->dummy_pipe_fds[0];
 802                         pt->fds[0].events = LWS_POLLIN;
 803                         pt->fds[0].revents = 0;
 804                         pt->fds_count = 1;
 805                         pt++;
 806                 }
 807         }
 808
 809 #ifdef LWS_WITH_PLUGINS
 810         if (info->plugin_dirs)
 811                 lws_plat_plugins_init(context, info->plugin_dirs);
 812 #endif
 813
 814         return 0;
 815 }