tools/usb/ffs-test.c

   1 /*
   2  * ffs-test.c -- user mode filesystem api for usb composite function
   3  *
   4  * Copyright (C) 2010 Samsung Electronics
   5  *                    Author: Michal Nazarewicz <mina86@mina86.com>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  20  */
  21
  22 /* $(CROSS_COMPILE)cc -Wall -Wextra -g -o ffs-test ffs-test.c -lpthread */
  23
  24
  25 #define _DEFAULT_SOURCE /* for endian.h */
  26
  27 #include <endian.h>
  28 #include <errno.h>
  29 #include <fcntl.h>
  30 #include <pthread.h>
  31 #include <stdarg.h>
  32 #include <stdbool.h>
  33 #include <stdio.h>
  34 #include <stdlib.h>
  35 #include <string.h>
  36 #include <sys/ioctl.h>
  37 #include <sys/stat.h>
  38 #include <sys/types.h>
  39 #include <unistd.h>
  40 #include <tools/le_byteshift.h>
  41
  42 #include "../../include/uapi/linux/usb/functionfs.h"
  43
  44
  45 /******************** Little Endian Handling ********************************/
  46
  47 /*
  48  * cpu_to_le16/32 are used when initializing structures, a context where a
  49  * function call is not allowed. To solve this, we code cpu_to_le16/32 in a way
  50  * that allows them to be used when initializing structures.
  51  */
  52
  53 #if __BYTE_ORDER == __LITTLE_ENDIAN
  54 #define cpu_to_le16(x)  (x)
  55 #define cpu_to_le32(x)  (x)
  56 #else
  57 #define cpu_to_le16(x)  ((((x) >> 8) & 0xffu) | (((x) & 0xffu) << 8))
  58 #define cpu_to_le32(x)  \
  59         ((((x) & 0xff000000u) >> 24) | (((x) & 0x00ff0000u) >>  8) | \
  60         (((x) & 0x0000ff00u) <<  8) | (((x) & 0x000000ffu) << 24))
  61 #endif
  62
  63 #define le32_to_cpu(x)  le32toh(x)
  64 #define le16_to_cpu(x)  le16toh(x)
  65
  66 /******************** Messages and Errors ***********************************/
  67
  68 static const char argv0[] = "ffs-test";
  69
  70 static unsigned verbosity = 7;
  71
  72 static void _msg(unsigned level, const char *fmt, ...)
  73 {
  74         if (level < 2)
  75                 level = 2;
  76         else if (level > 7)
  77                 level = 7;
  78
  79         if (level <= verbosity) {
  80                 static const char levels[8][6] = {
  81                         [2] = "crit:",
  82                         [3] = "err: ",
  83                         [4] = "warn:",
  84                         [5] = "note:",
  85                         [6] = "info:",
  86                         [7] = "dbg: "
  87                 };
  88
  89                 int _errno = errno;
  90                 va_list ap;
  91
  92                 fprintf(stderr, "%s: %s ", argv0, levels[level]);
  93                 va_start(ap, fmt);
  94                 vfprintf(stderr, fmt, ap);
  95                 va_end(ap);
  96
  97                 if (fmt[strlen(fmt) - 1] != '\n') {
  98                         char buffer[128];
  99                         strerror_r(_errno, buffer, sizeof buffer);
 100                         fprintf(stderr, ": (-%d) %s\n", _errno, buffer);
 101                 }
 102
 103                 fflush(stderr);
 104         }
 105 }
 106
 107 #define die(...)  (_msg(2, __VA_ARGS__), exit(1))
 108 #define err(...)   _msg(3, __VA_ARGS__)
 109 #define warn(...)  _msg(4, __VA_ARGS__)
 110 #define note(...)  _msg(5, __VA_ARGS__)
 111 #define info(...)  _msg(6, __VA_ARGS__)
 112 #define debug(...) _msg(7, __VA_ARGS__)
 113
 114 #define die_on(cond, ...) do { \
 115         if (cond) \
 116                 die(__VA_ARGS__); \
 117         } while (0)
 118
 119
 120 /******************** Descriptors and Strings *******************************/
 121
 122 static const struct {
 123         struct usb_functionfs_descs_head_v2 header;
 124         __le32 fs_count;
 125         __le32 hs_count;
 126         __le32 ss_count;
 127         struct {
 128                 struct usb_interface_descriptor intf;
 129                 struct usb_endpoint_descriptor_no_audio sink;
 130                 struct usb_endpoint_descriptor_no_audio source;
 131         } __attribute__((packed)) fs_descs, hs_descs;
 132         struct {
 133                 struct usb_interface_descriptor intf;
 134                 struct usb_endpoint_descriptor_no_audio sink;
 135                 struct usb_ss_ep_comp_descriptor sink_comp;
 136                 struct usb_endpoint_descriptor_no_audio source;
 137                 struct usb_ss_ep_comp_descriptor source_comp;
 138         } ss_descs;
 139 } __attribute__((packed)) descriptors = {
 140         .header = {
 141                 .magic = cpu_to_le32(FUNCTIONFS_DESCRIPTORS_MAGIC_V2),
 142                 .flags = cpu_to_le32(FUNCTIONFS_HAS_FS_DESC |
 143                                      FUNCTIONFS_HAS_HS_DESC |
 144                                      FUNCTIONFS_HAS_SS_DESC),
 145                 .length = cpu_to_le32(sizeof descriptors),
 146         },
 147         .fs_count = cpu_to_le32(3),
 148         .fs_descs = {
 149                 .intf = {
 150                         .bLength = sizeof descriptors.fs_descs.intf,
 151                         .bDescriptorType = USB_DT_INTERFACE,
 152                         .bNumEndpoints = 2,
 153                         .bInterfaceClass = USB_CLASS_VENDOR_SPEC,
 154                         .iInterface = 1,
 155                 },
 156                 .sink = {
 157                         .bLength = sizeof descriptors.fs_descs.sink,
 158                         .bDescriptorType = USB_DT_ENDPOINT,
 159                         .bEndpointAddress = 1 | USB_DIR_IN,
 160                         .bmAttributes = USB_ENDPOINT_XFER_BULK,
 161                         /* .wMaxPacketSize = autoconfiguration (kernel) */
 162                 },
 163                 .source = {
 164                         .bLength = sizeof descriptors.fs_descs.source,
 165                         .bDescriptorType = USB_DT_ENDPOINT,
 166                         .bEndpointAddress = 2 | USB_DIR_OUT,
 167                         .bmAttributes = USB_ENDPOINT_XFER_BULK,
 168                         /* .wMaxPacketSize = autoconfiguration (kernel) */
 169                 },
 170         },
 171         .hs_count = cpu_to_le32(3),
 172         .hs_descs = {
 173                 .intf = {
 174                         .bLength = sizeof descriptors.fs_descs.intf,
 175                         .bDescriptorType = USB_DT_INTERFACE,
 176                         .bNumEndpoints = 2,
 177                         .bInterfaceClass = USB_CLASS_VENDOR_SPEC,
 178                         .iInterface = 1,
 179                 },
 180                 .sink = {
 181                         .bLength = sizeof descriptors.hs_descs.sink,
 182                         .bDescriptorType = USB_DT_ENDPOINT,
 183                         .bEndpointAddress = 1 | USB_DIR_IN,
 184                         .bmAttributes = USB_ENDPOINT_XFER_BULK,
 185                         .wMaxPacketSize = cpu_to_le16(512),
 186                 },
 187                 .source = {
 188                         .bLength = sizeof descriptors.hs_descs.source,
 189                         .bDescriptorType = USB_DT_ENDPOINT,
 190                         .bEndpointAddress = 2 | USB_DIR_OUT,
 191                         .bmAttributes = USB_ENDPOINT_XFER_BULK,
 192                         .wMaxPacketSize = cpu_to_le16(512),
 193                         .bInterval = 1, /* NAK every 1 uframe */
 194                 },
 195         },
 196         .ss_count = cpu_to_le32(5),
 197         .ss_descs = {
 198                 .intf = {
 199                         .bLength = sizeof descriptors.fs_descs.intf,
 200                         .bDescriptorType = USB_DT_INTERFACE,
 201                         .bNumEndpoints = 2,
 202                         .bInterfaceClass = USB_CLASS_VENDOR_SPEC,
 203                         .iInterface = 1,
 204                 },
 205                 .sink = {
 206                         .bLength = sizeof descriptors.hs_descs.sink,
 207                         .bDescriptorType = USB_DT_ENDPOINT,
 208                         .bEndpointAddress = 1 | USB_DIR_IN,
 209                         .bmAttributes = USB_ENDPOINT_XFER_BULK,
 210                         .wMaxPacketSize = cpu_to_le16(1024),
 211                 },
 212                 .sink_comp = {
 213                         .bLength = USB_DT_SS_EP_COMP_SIZE,
 214                         .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
 215                         .bMaxBurst = 0,
 216                         .bmAttributes = 0,
 217                         .wBytesPerInterval = 0,
 218                 },
 219                 .source = {
 220                         .bLength = sizeof descriptors.hs_descs.source,
 221                         .bDescriptorType = USB_DT_ENDPOINT,
 222                         .bEndpointAddress = 2 | USB_DIR_OUT,
 223                         .bmAttributes = USB_ENDPOINT_XFER_BULK,
 224                         .wMaxPacketSize = cpu_to_le16(1024),
 225                         .bInterval = 1, /* NAK every 1 uframe */
 226                 },
 227                 .source_comp = {
 228                         .bLength = USB_DT_SS_EP_COMP_SIZE,
 229                         .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
 230                         .bMaxBurst = 0,
 231                         .bmAttributes = 0,
 232                         .wBytesPerInterval = 0,
 233                 },
 234         },
 235 };
 236
 237 static size_t descs_to_legacy(void **legacy, const void *descriptors_v2)
 238 {
 239         const unsigned char *descs_end, *descs_start;
 240         __u32 length, fs_count = 0, hs_count = 0, count;
 241
 242         /* Read v2 header */
 243         {
 244                 const struct {
 245                         const struct usb_functionfs_descs_head_v2 header;
 246                         const __le32 counts[];
 247                 } __attribute__((packed)) *const in = descriptors_v2;
 248                 const __le32 *counts = in->counts;
 249                 __u32 flags;
 250
 251                 if (le32_to_cpu(in->header.magic) !=
 252                     FUNCTIONFS_DESCRIPTORS_MAGIC_V2)
 253                         return 0;
 254                 length = le32_to_cpu(in->header.length);
 255                 if (length <= sizeof in->header)
 256                         return 0;
 257                 length -= sizeof in->header;
 258                 flags = le32_to_cpu(in->header.flags);
 259                 if (flags & ~(FUNCTIONFS_HAS_FS_DESC | FUNCTIONFS_HAS_HS_DESC |
 260                               FUNCTIONFS_HAS_SS_DESC))
 261                         return 0;
 262
 263 #define GET_NEXT_COUNT_IF_FLAG(ret, flg) do {           \
 264                         if (!(flags & (flg)))           \
 265                                 break;                  \
 266                         if (length < 4)                 \
 267                                 return 0;               \
 268                         ret = le32_to_cpu(*counts);     \
 269                         length -= 4;                    \
 270                         ++counts;                       \
 271                 } while (0)
 272
 273                 GET_NEXT_COUNT_IF_FLAG(fs_count, FUNCTIONFS_HAS_FS_DESC);
 274                 GET_NEXT_COUNT_IF_FLAG(hs_count, FUNCTIONFS_HAS_HS_DESC);
 275                 GET_NEXT_COUNT_IF_FLAG(count, FUNCTIONFS_HAS_SS_DESC);
 276
 277                 count = fs_count + hs_count;
 278                 if (!count)
 279                         return 0;
 280                 descs_start = (const void *)counts;
 281
 282 #undef GET_NEXT_COUNT_IF_FLAG
 283         }
 284
 285         /*
 286          * Find the end of FS and HS USB descriptors.  SS descriptors
 287          * are ignored since legacy format does not support them.
 288          */
 289         descs_end = descs_start;
 290         do {
 291                 if (length < *descs_end)
 292                         return 0;
 293                 length -= *descs_end;
 294                 descs_end += *descs_end;
 295         } while (--count);
 296
 297         /* Allocate legacy descriptors and copy the data. */
 298         {
 299 #pragma GCC diagnostic push
 300 #pragma GCC diagnostic ignored "-Wdeprecated-declarations"
 301                 struct {
 302                         struct usb_functionfs_descs_head header;
 303                         __u8 descriptors[];
 304                 } __attribute__((packed)) *out;
 305 #pragma GCC diagnostic pop
 306
 307                 length = sizeof out->header + (descs_end - descs_start);
 308                 out = malloc(length);
 309                 out->header.magic = cpu_to_le32(FUNCTIONFS_DESCRIPTORS_MAGIC);
 310                 out->header.length = cpu_to_le32(length);
 311                 out->header.fs_count = cpu_to_le32(fs_count);
 312                 out->header.hs_count = cpu_to_le32(hs_count);
 313                 memcpy(out->descriptors, descs_start, descs_end - descs_start);
 314                 *legacy = out;
 315         }
 316
 317         return length;
 318 }
 319
 320
 321 #define STR_INTERFACE_ "Source/Sink"
 322
 323 static const struct {
 324         struct usb_functionfs_strings_head header;
 325         struct {
 326                 __le16 code;
 327                 const char str1[sizeof STR_INTERFACE_];
 328         } __attribute__((packed)) lang0;
 329 } __attribute__((packed)) strings = {
 330         .header = {
 331                 .magic = cpu_to_le32(FUNCTIONFS_STRINGS_MAGIC),
 332                 .length = cpu_to_le32(sizeof strings),
 333                 .str_count = cpu_to_le32(1),
 334                 .lang_count = cpu_to_le32(1),
 335         },
 336         .lang0 = {
 337                 cpu_to_le16(0x0409), /* en-us */
 338                 STR_INTERFACE_,
 339         },
 340 };
 341
 342 #define STR_INTERFACE strings.lang0.str1
 343
 344
 345 /******************** Files and Threads Handling ****************************/
 346
 347 struct thread;
 348
 349 static ssize_t read_wrap(struct thread *t, void *buf, size_t nbytes);
 350 static ssize_t write_wrap(struct thread *t, const void *buf, size_t nbytes);
 351 static ssize_t ep0_consume(struct thread *t, const void *buf, size_t nbytes);
 352 static ssize_t fill_in_buf(struct thread *t, void *buf, size_t nbytes);
 353 static ssize_t empty_out_buf(struct thread *t, const void *buf, size_t nbytes);
 354
 355
 356 static struct thread {
 357         const char *const filename;
 358         size_t buf_size;
 359
 360         ssize_t (*in)(struct thread *, void *, size_t);
 361         const char *const in_name;
 362
 363         ssize_t (*out)(struct thread *, const void *, size_t);
 364         const char *const out_name;
 365
 366         int fd;
 367         pthread_t id;
 368         void *buf;
 369         ssize_t status;
 370 } threads[] = {
 371         {
 372                 "ep0", 4 * sizeof(struct usb_functionfs_event),
 373                 read_wrap, NULL,
 374                 ep0_consume, "<consume>",
 375                 0, 0, NULL, 0
 376         },
 377         {
 378                 "ep1", 8 * 1024,
 379                 fill_in_buf, "<in>",
 380                 write_wrap, NULL,
 381                 0, 0, NULL, 0
 382         },
 383         {
 384                 "ep2", 8 * 1024,
 385                 read_wrap, NULL,
 386                 empty_out_buf, "<out>",
 387                 0, 0, NULL, 0
 388         },
 389 };
 390
 391
 392 static void init_thread(struct thread *t)
 393 {
 394         t->buf = malloc(t->buf_size);
 395         die_on(!t->buf, "malloc");
 396
 397         t->fd = open(t->filename, O_RDWR);
 398         die_on(t->fd < 0, "%s", t->filename);
 399 }
 400
 401 static void cleanup_thread(void *arg)
 402 {
 403         struct thread *t = arg;
 404         int ret, fd;
 405
 406         fd = t->fd;
 407         if (t->fd < 0)
 408                 return;
 409         t->fd = -1;
 410
 411         /* test the FIFO ioctls (non-ep0 code paths) */
 412         if (t != threads) {
 413                 ret = ioctl(fd, FUNCTIONFS_FIFO_STATUS);
 414                 if (ret < 0) {
 415                         /* ENODEV reported after disconnect */
 416                         if (errno != ENODEV)
 417                                 err("%s: get fifo status", t->filename);
 418                 } else if (ret) {
 419                         warn("%s: unclaimed = %d\n", t->filename, ret);
 420                         if (ioctl(fd, FUNCTIONFS_FIFO_FLUSH) < 0)
 421                                 err("%s: fifo flush", t->filename);
 422                 }
 423         }
 424
 425         if (close(fd) < 0)
 426                 err("%s: close", t->filename);
 427
 428         free(t->buf);
 429         t->buf = NULL;
 430 }
 431
 432 static void *start_thread_helper(void *arg)
 433 {
 434         const char *name, *op, *in_name, *out_name;
 435         struct thread *t = arg;
 436         ssize_t ret;
 437
 438         info("%s: starts\n", t->filename);
 439         in_name = t->in_name ? t->in_name : t->filename;
 440         out_name = t->out_name ? t->out_name : t->filename;
 441
 442         pthread_cleanup_push(cleanup_thread, arg);
 443
 444         for (;;) {
 445                 pthread_testcancel();
 446
 447                 ret = t->in(t, t->buf, t->buf_size);
 448                 if (ret > 0) {
 449                         ret = t->out(t, t->buf, ret);
 450                         name = out_name;
 451                         op = "write";
 452                 } else {
 453                         name = in_name;
 454                         op = "read";
 455                 }
 456
 457                 if (ret > 0) {
 458                         /* nop */
 459                 } else if (!ret) {
 460                         debug("%s: %s: EOF", name, op);
 461                         break;
 462                 } else if (errno == EINTR || errno == EAGAIN) {
 463                         debug("%s: %s", name, op);
 464                 } else {
 465                         warn("%s: %s", name, op);
 466                         break;
 467                 }
 468         }
 469
 470         pthread_cleanup_pop(1);
 471
 472         t->status = ret;
 473         info("%s: ends\n", t->filename);
 474         return NULL;
 475 }
 476
 477 static void start_thread(struct thread *t)
 478 {
 479         debug("%s: starting\n", t->filename);
 480
 481         die_on(pthread_create(&t->id, NULL, start_thread_helper, t) < 0,
 482                "pthread_create(%s)", t->filename);
 483 }
 484
 485 static void join_thread(struct thread *t)
 486 {
 487         int ret = pthread_join(t->id, NULL);
 488
 489         if (ret < 0)
 490                 err("%s: joining thread", t->filename);
 491         else
 492                 debug("%s: joined\n", t->filename);
 493 }
 494
 495
 496 static ssize_t read_wrap(struct thread *t, void *buf, size_t nbytes)
 497 {
 498         return read(t->fd, buf, nbytes);
 499 }
 500
 501 static ssize_t write_wrap(struct thread *t, const void *buf, size_t nbytes)
 502 {
 503         return write(t->fd, buf, nbytes);
 504 }
 505
 506
 507 /******************** Empty/Fill buffer routines ****************************/
 508
 509 /* 0 -- stream of zeros, 1 -- i % 63, 2 -- pipe */
 510 enum pattern { PAT_ZERO, PAT_SEQ, PAT_PIPE };
 511 static enum pattern pattern;
 512
 513 static ssize_t
 514 fill_in_buf(struct thread *ignore, void *buf, size_t nbytes)
 515 {
 516         size_t i;
 517         __u8 *p;
 518
 519         (void)ignore;
 520
 521         switch (pattern) {
 522         case PAT_ZERO:
 523                 memset(buf, 0, nbytes);
 524                 break;
 525
 526         case PAT_SEQ:
 527                 for (p = buf, i = 0; i < nbytes; ++i, ++p)
 528                         *p = i % 63;
 529                 break;
 530
 531         case PAT_PIPE:
 532                 return fread(buf, 1, nbytes, stdin);
 533         }
 534
 535         return nbytes;
 536 }
 537
 538 static ssize_t
 539 empty_out_buf(struct thread *ignore, const void *buf, size_t nbytes)
 540 {
 541         const __u8 *p;
 542         __u8 expected;
 543         ssize_t ret;
 544         size_t len;
 545
 546         (void)ignore;
 547
 548         switch (pattern) {
 549         case PAT_ZERO:
 550                 expected = 0;
 551                 for (p = buf, len = 0; len < nbytes; ++p, ++len)
 552                         if (*p)
 553                                 goto invalid;
 554                 break;
 555
 556         case PAT_SEQ:
 557                 for (p = buf, len = 0; len < nbytes; ++p, ++len)
 558                         if (*p != len % 63) {
 559                                 expected = len % 63;
 560                                 goto invalid;
 561                         }
 562                 break;
 563
 564         case PAT_PIPE:
 565                 ret = fwrite(buf, nbytes, 1, stdout);
 566                 if (ret > 0)
 567                         fflush(stdout);
 568                 break;
 569
 570 invalid:
 571                 err("bad OUT byte %zd, expected %02x got %02x\n",
 572                     len, expected, *p);
 573                 for (p = buf, len = 0; len < nbytes; ++p, ++len) {
 574                         if (0 == (len % 32))
 575                                 fprintf(stderr, "%4zd:", len);
 576                         fprintf(stderr, " %02x", *p);
 577                         if (31 == (len % 32))
 578                                 fprintf(stderr, "\n");
 579                 }
 580                 fflush(stderr);
 581                 errno = EILSEQ;
 582                 return -1;
 583         }
 584
 585         return len;
 586 }
 587
 588
 589 /******************** Endpoints routines ************************************/
 590
 591 static void handle_setup(const struct usb_ctrlrequest *setup)
 592 {
 593         printf("bRequestType = %d\n", setup->bRequestType);
 594         printf("bRequest     = %d\n", setup->bRequest);
 595         printf("wValue       = %d\n", le16_to_cpu(setup->wValue));
 596         printf("wIndex       = %d\n", le16_to_cpu(setup->wIndex));
 597         printf("wLength      = %d\n", le16_to_cpu(setup->wLength));
 598 }
 599
 600 static ssize_t
 601 ep0_consume(struct thread *ignore, const void *buf, size_t nbytes)
 602 {
 603         static const char *const names[] = {
 604                 [FUNCTIONFS_BIND] = "BIND",
 605                 [FUNCTIONFS_UNBIND] = "UNBIND",
 606                 [FUNCTIONFS_ENABLE] = "ENABLE",
 607                 [FUNCTIONFS_DISABLE] = "DISABLE",
 608                 [FUNCTIONFS_SETUP] = "SETUP",
 609                 [FUNCTIONFS_SUSPEND] = "SUSPEND",
 610                 [FUNCTIONFS_RESUME] = "RESUME",
 611         };
 612
 613         const struct usb_functionfs_event *event = buf;
 614         size_t n;
 615
 616         (void)ignore;
 617
 618         for (n = nbytes / sizeof *event; n; --n, ++event)
 619                 switch (event->type) {
 620                 case FUNCTIONFS_BIND:
 621                 case FUNCTIONFS_UNBIND:
 622                 case FUNCTIONFS_ENABLE:
 623                 case FUNCTIONFS_DISABLE:
 624                 case FUNCTIONFS_SETUP:
 625                 case FUNCTIONFS_SUSPEND:
 626                 case FUNCTIONFS_RESUME:
 627                         printf("Event %s\n", names[event->type]);
 628                         if (event->type == FUNCTIONFS_SETUP)
 629                                 handle_setup(&event->u.setup);
 630                         break;
 631
 632                 default:
 633                         printf("Event %03u (unknown)\n", event->type);
 634                 }
 635
 636         return nbytes;
 637 }
 638
 639 static void ep0_init(struct thread *t, bool legacy_descriptors)
 640 {
 641         void *legacy;
 642         ssize_t ret;
 643         size_t len;
 644
 645         if (legacy_descriptors) {
 646                 info("%s: writing descriptors\n", t->filename);
 647                 goto legacy;
 648         }
 649
 650         info("%s: writing descriptors (in v2 format)\n", t->filename);
 651         ret = write(t->fd, &descriptors, sizeof descriptors);
 652
 653         if (ret < 0 && errno == EINVAL) {
 654                 warn("%s: new format rejected, trying legacy\n", t->filename);
 655 legacy:
 656                 len = descs_to_legacy(&legacy, &descriptors);
 657                 if (len) {
 658                         ret = write(t->fd, legacy, len);
 659                         free(legacy);
 660                 }
 661         }
 662         die_on(ret < 0, "%s: write: descriptors", t->filename);
 663
 664         info("%s: writing strings\n", t->filename);
 665         ret = write(t->fd, &strings, sizeof strings);
 666         die_on(ret < 0, "%s: write: strings", t->filename);
 667 }
 668
 669
 670 /******************** Main **************************************************/
 671
 672 int main(int argc, char **argv)
 673 {
 674         bool legacy_descriptors;
 675         unsigned i;
 676
 677         legacy_descriptors = argc > 2 && !strcmp(argv[1], "-l");
 678
 679         init_thread(threads);
 680         ep0_init(threads, legacy_descriptors);
 681
 682         for (i = 1; i < sizeof threads / sizeof *threads; ++i)
 683                 init_thread(threads + i);
 684
 685         for (i = 1; i < sizeof threads / sizeof *threads; ++i)
 686                 start_thread(threads + i);
 687
 688         start_thread_helper(threads);
 689
 690         for (i = 1; i < sizeof threads / sizeof *threads; ++i)
 691                 join_thread(threads + i);
 692
 693         return 0;
 694 }