1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742
|
/*
* Linux USB support
*
* Copyright (c) 2000-2003 Johannes Erdfelt <johannes@erdfelt.com>
*
* This library is covered by the LGPL, read LICENSE for details.
*/
#include <stdlib.h> /* getenv, etc */
#include <unistd.h>
#include <string.h>
#include <stdio.h>
#include <fcntl.h>
#include <errno.h>
#include <sys/time.h>
#include <dirent.h>
#include "linux.h"
#include "usbi.h"
static char usb_path[PATH_MAX + 1] = "";
static int device_open(struct usb_device *dev)
{
char filename[PATH_MAX + 1];
int fd;
snprintf(filename, sizeof(filename) - 1, "%s/%s/%s",
usb_path, dev->bus->dirname, dev->filename);
fd = open(filename, O_RDWR);
if (fd < 0) {
fd = open(filename, O_RDONLY);
if (fd < 0)
USB_ERROR_STR(-errno, "failed to open %s: %s",
filename, strerror(errno));
}
return fd;
}
int usb_os_open(usb_dev_handle *dev)
{
dev->fd = device_open(dev->device);
return 0;
}
int usb_os_close(usb_dev_handle *dev)
{
if (dev->fd < 0)
return 0;
if (close(dev->fd) == -1)
/* Failing trying to close a file really isn't an error, so return 0 */
USB_ERROR_STR(0, "tried to close device fd %d: %s", dev->fd,
strerror(errno));
return 0;
}
int usb_set_configuration(usb_dev_handle *dev, int configuration)
{
int ret;
ret = ioctl(dev->fd, IOCTL_USB_SETCONFIG, &configuration);
if (ret < 0)
USB_ERROR_STR(-errno, "could not set config %d: %s", configuration,
strerror(errno));
dev->config = configuration;
return 0;
}
int usb_claim_interface(usb_dev_handle *dev, int interface)
{
int ret;
ret = ioctl(dev->fd, IOCTL_USB_CLAIMINTF, &interface);
if (ret < 0) {
if (errno == EBUSY && usb_debug > 0)
fprintf(stderr, "Check that you have permissions to write to %s/%s and, if you don't, that you set up hotplug (http://linux-hotplug.sourceforge.net/) correctly.\n", dev->bus->dirname, dev->device->filename);
USB_ERROR_STR(-errno, "could not claim interface %d: %s", interface,
strerror(errno));
}
dev->interface = interface;
return 0;
}
int usb_release_interface(usb_dev_handle *dev, int interface)
{
int ret;
ret = ioctl(dev->fd, IOCTL_USB_RELEASEINTF, &interface);
if (ret < 0)
USB_ERROR_STR(-errno, "could not release intf %d: %s", interface,
strerror(errno));
dev->interface = -1;
return 0;
}
int usb_set_altinterface(usb_dev_handle *dev, int alternate)
{
int ret;
struct usb_setinterface setintf;
if (dev->interface < 0)
USB_ERROR(-EINVAL);
setintf.interface = dev->interface;
setintf.altsetting = alternate;
ret = ioctl(dev->fd, IOCTL_USB_SETINTF, &setintf);
if (ret < 0)
USB_ERROR_STR(-errno, "could not set alt intf %d/%d: %s",
dev->interface, alternate, strerror(errno));
dev->altsetting = alternate;
return 0;
}
/*
* Linux usbfs has a limit of one page size for synchronous bulk read/write.
* 4096 is the most portable maximum we can do for now.
* Linux usbfs has a limit of 16KB for the URB interface. We use this now
* to get better performance for USB 2.0 devices.
*/
#define MAX_READ_WRITE (16 * 1024)
int usb_control_msg(usb_dev_handle *dev, int requesttype, int request,
int value, int index, char *bytes, int size, int timeout)
{
struct usb_ctrltransfer ctrl;
int ret;
ctrl.bRequestType = requesttype;
ctrl.bRequest = request;
ctrl.wValue = value;
ctrl.wIndex = index;
ctrl.wLength = size;
ctrl.data = bytes;
ctrl.timeout = timeout;
ret = ioctl(dev->fd, IOCTL_USB_CONTROL, &ctrl);
if (ret < 0)
USB_ERROR_STR(-errno, "error sending control message: %s", strerror(errno));
return ret;
}
#define URB_USERCONTEXT_COOKIE ((void *)0x1)
/* Reading and writing are the same except for the endpoint */
static int usb_urb_transfer(usb_dev_handle *dev, int ep, int urbtype,
char *bytes, int size, int timeout)
{
struct usb_urb urb;
int bytesdone = 0, requested;
struct timeval tv, tv_ref, tv_now;
struct usb_urb *context;
int ret, waiting;
/*
* HACK: The use of urb.usercontext is a hack to get threaded applications
* sort of working again. Threaded support is still not recommended, but
* this should allow applications to work in the common cases. Basically,
* if we get the completion for an URB we're not waiting for, then we update
* the usercontext pointer to 1 for the other threads URB and it will see
* the change after it wakes up from the the timeout. Ugly, but it works.
*/
/*
* Get actual time, and add the timeout value. The result is the absolute
* time where we have to quit waiting for an message.
*/
gettimeofday(&tv_ref, NULL);
tv_ref.tv_sec = tv_ref.tv_sec + timeout / 1000;
tv_ref.tv_usec = tv_ref.tv_usec + (timeout % 1000) * 1000;
if (tv_ref.tv_usec > 1000000) {
tv_ref.tv_usec -= 1000000;
tv_ref.tv_sec++;
}
waiting = 1;
do {
fd_set writefds;
requested = size - bytesdone;
if (requested > MAX_READ_WRITE)
requested = MAX_READ_WRITE;
urb.type = urbtype;
urb.endpoint = ep;
urb.flags = 0;
urb.buffer = bytes + bytesdone;
urb.buffer_length = requested;
urb.signr = 0;
urb.actual_length = 0;
urb.number_of_packets = 0; /* don't do isochronous yet */
urb.usercontext = NULL;
ret = ioctl(dev->fd, IOCTL_USB_SUBMITURB, &urb);
if (ret < 0) {
USB_ERROR_STR(-errno, "error submitting URB: %s", strerror(errno));
return ret;
}
restart:
context = NULL;
while (!urb.usercontext && ((ret = ioctl(dev->fd, IOCTL_USB_REAPURBNDELAY, &context)) == -1) && waiting) {
if (ret == -1)
{
if (errno == ENODEV)
{
return -ENODEV;
}
}
tv.tv_sec = 0;
tv.tv_usec = 1000; // 1 msec
FD_ZERO(&writefds);
FD_SET(dev->fd, &writefds);
select(dev->fd + 1, NULL, &writefds, NULL, &tv); //sub second wait
if (timeout) {
/* compare with actual time, as the select timeout is not that precise */
gettimeofday(&tv_now, NULL);
if ((tv_now.tv_sec > tv_ref.tv_sec) ||
((tv_now.tv_sec == tv_ref.tv_sec) && (tv_now.tv_usec >= tv_ref.tv_usec)))
waiting = 0;
}
}
if (context && context != &urb) {
context->usercontext = URB_USERCONTEXT_COOKIE;
/* We need to restart since we got a successful URB, but not ours */
waiting = 1;
goto restart;
}
/*
* If there was an error, that wasn't EAGAIN (no completion), then
* something happened during the reaping and we should return that
* error now
*/
if (ret < 0 && !urb.usercontext && errno != EAGAIN)
USB_ERROR_STR(-errno, "error reaping URB: %s", strerror(errno));
bytesdone += urb.actual_length;
} while ((ret == 0 || urb.usercontext) && bytesdone < size && urb.actual_length == requested && waiting);
/* If the URB didn't complete in success or error, then let's unlink it */
if ((ret < 0 && !urb.usercontext) || (!waiting && bytesdone < size)) {
int rc;
if (!waiting)
rc = -ETIMEDOUT;
else
rc = urb.status;
ret = ioctl(dev->fd, IOCTL_USB_DISCARDURB, &urb);
if (ret < 0 && errno != EINVAL && usb_debug >= 1)
fprintf(stderr, "error discarding URB: %s", strerror(errno));
/*
* When the URB is unlinked, it gets moved to the completed list and
* then we need to reap it or else the next time we call this function,
* we'll get the previous completion and exit early
*/
ioctl(dev->fd, IOCTL_USB_REAPURB, &context);
return rc;
}
return bytesdone;
}
int usb_bulk_write(usb_dev_handle *dev, int ep, const char *bytes, int size,
int timeout)
{
/* Ensure the endpoint address is correct */
return usb_urb_transfer(dev, ep, USB_URB_TYPE_BULK, (char *)bytes, size,
timeout);
}
int usb_bulk_read(usb_dev_handle *dev, int ep, char *bytes, int size,
int timeout)
{
/* Ensure the endpoint address is correct */
ep |= USB_ENDPOINT_IN;
return usb_urb_transfer(dev, ep, USB_URB_TYPE_BULK, bytes, size,
timeout);
}
/*
* FIXME: Packetize large buffers here. 2.4 HCDs (atleast, haven't checked
* 2.5 HCDs yet) don't handle multi-packet Interrupt transfers. So we need
* to lookup the endpoint packet size and packetize appropriately here.
*/
int usb_interrupt_write(usb_dev_handle *dev, int ep, const char *bytes, int size,
int timeout)
{
/* Ensure the endpoint address is correct */
return usb_urb_transfer(dev, ep, USB_URB_TYPE_INTERRUPT, (char *)bytes, size,
timeout);
}
int usb_interrupt_read(usb_dev_handle *dev, int ep, char *bytes, int size,
int timeout)
{
/* Ensure the endpoint address is correct */
ep |= USB_ENDPOINT_IN;
return usb_urb_transfer(dev, ep, USB_URB_TYPE_INTERRUPT, bytes, size,
timeout);
}
int usb_os_find_busses(struct usb_bus **busses)
{
struct usb_bus *fbus = NULL;
DIR *dir;
struct dirent *entry;
dir = opendir(usb_path);
if (!dir)
USB_ERROR_STR(-errno, "couldn't opendir(%s): %s", usb_path,
strerror(errno));
while ((entry = readdir(dir)) != NULL) {
struct usb_bus *bus;
/* Skip anything starting with a . */
if (entry->d_name[0] == '.')
continue;
if (!strchr("0123456789", entry->d_name[strlen(entry->d_name) - 1])) {
if (usb_debug >= 2)
fprintf(stderr, "usb_os_find_busses: Skipping non bus directory %s\n",
entry->d_name);
continue;
}
bus = malloc(sizeof(*bus));
if (!bus)
USB_ERROR(-ENOMEM);
memset((void *)bus, 0, sizeof(*bus));
strncpy(bus->dirname, entry->d_name, sizeof(bus->dirname) - 1);
bus->dirname[sizeof(bus->dirname) - 1] = 0;
bus->location = atoi(bus->dirname);
LIST_ADD(fbus, bus);
if (usb_debug >= 2)
fprintf(stderr, "usb_os_find_busses: Found %s\n", bus->dirname);
}
closedir(dir);
*busses = fbus;
return 0;
}
int usb_os_find_devices(struct usb_bus *bus, struct usb_device **devices)
{
struct usb_device *fdev = NULL;
DIR *dir;
struct dirent *entry;
char dirpath[PATH_MAX + 1];
snprintf(dirpath, PATH_MAX, "%s/%s", usb_path, bus->dirname);
dir = opendir(dirpath);
if (!dir)
USB_ERROR_STR(-errno, "couldn't opendir(%s): %s", dirpath,
strerror(errno));
while ((entry = readdir(dir)) != NULL) {
unsigned char device_desc[DEVICE_DESC_LENGTH];
char filename[PATH_MAX + 1];
struct usb_device *dev;
struct usb_connectinfo connectinfo;
int i, fd, ret;
/* Skip anything starting with a . */
if (entry->d_name[0] == '.')
continue;
dev = malloc(sizeof(*dev));
if (!dev)
USB_ERROR(-ENOMEM);
memset((void *)dev, 0, sizeof(*dev));
dev->bus = bus;
strncpy(dev->filename, entry->d_name, sizeof(dev->filename) - 1);
dev->filename[sizeof(dev->filename) - 1] = 0;
snprintf(filename, sizeof(filename) - 1, "%s/%s", dirpath, entry->d_name);
fd = open(filename, O_RDWR);
if (fd < 0) {
fd = open(filename, O_RDONLY);
if (fd < 0) {
if (usb_debug >= 2)
fprintf(stderr, "usb_os_find_devices: Couldn't open %s\n",
filename);
free(dev);
continue;
}
}
/* Get the device number */
ret = ioctl(fd, IOCTL_USB_CONNECTINFO, &connectinfo);
if (ret < 0) {
if (usb_debug)
fprintf(stderr, "usb_os_find_devices: couldn't get connect info\n");
} else
dev->devnum = connectinfo.devnum;
ret = read(fd, (void *)device_desc, DEVICE_DESC_LENGTH);
if (ret < 0) {
if (usb_debug)
fprintf(stderr, "usb_os_find_devices: Couldn't read descriptor\n");
free(dev);
goto err;
}
/*
* Linux kernel converts the words in this descriptor to CPU endian, so
* we use the undocumented W character for usb_parse_descriptor() that
* doesn't convert endianess when parsing the descriptor
*/
usb_parse_descriptor(device_desc, "bbWbbbbWWWbbbb", &dev->descriptor);
LIST_ADD(fdev, dev);
if (usb_debug >= 2)
fprintf(stderr, "usb_os_find_devices: Found %s on %s\n",
dev->filename, bus->dirname);
/* Now try to fetch the rest of the descriptors */
if (dev->descriptor.bNumConfigurations > USB_MAXCONFIG)
/* Silent since we'll try again later */
goto err;
if (dev->descriptor.bNumConfigurations < 1)
/* Silent since we'll try again later */
goto err;
dev->config = (struct usb_config_descriptor *)malloc(dev->descriptor.bNumConfigurations * sizeof(struct usb_config_descriptor));
if (!dev->config)
/* Silent since we'll try again later */
goto err;
memset(dev->config, 0, dev->descriptor.bNumConfigurations *
sizeof(struct usb_config_descriptor));
for (i = 0; i < dev->descriptor.bNumConfigurations; i++) {
unsigned char buffer[8], *bigbuffer;
struct usb_config_descriptor config;
/* Get the first 8 bytes so we can figure out what the total length is */
ret = read(fd, (void *)buffer, 8);
if (ret < 8) {
if (usb_debug >= 1) {
if (ret < 0)
fprintf(stderr, "Unable to get descriptor (%d)\n", ret);
else
fprintf(stderr, "Config descriptor too short (expected %d, got %d)\n", 8, ret);
}
goto err;
}
usb_parse_descriptor(buffer, "bbw", &config);
bigbuffer = malloc(config.wTotalLength);
if (!bigbuffer) {
if (usb_debug >= 1)
fprintf(stderr, "Unable to allocate memory for descriptors\n");
goto err;
}
/* Read the rest of the config descriptor */
memcpy(bigbuffer, buffer, 8);
ret = read(fd, (void *)(bigbuffer + 8), config.wTotalLength - 8);
if (ret < config.wTotalLength - 8) {
if (usb_debug >= 1) {
if (ret < 0)
fprintf(stderr, "Unable to get descriptor (%d)\n", ret);
else
fprintf(stderr, "Config descriptor too short (expected %d, got %d)\n", config.wTotalLength, ret);
}
free(bigbuffer);
goto err;
}
ret = usb_parse_configuration(&dev->config[i], bigbuffer);
if (usb_debug >= 2) {
if (ret > 0)
fprintf(stderr, "Descriptor data still left\n");
else if (ret < 0)
fprintf(stderr, "Unable to parse descriptors\n");
}
free(bigbuffer);
}
err:
close(fd);
}
closedir(dir);
*devices = fdev;
return 0;
}
int usb_os_determine_children(struct usb_bus *bus)
{
struct usb_device *dev, *devices[256];
struct usb_ioctl command;
int ret, i, i1;
/* Create a list of devices first */
memset(devices, 0, sizeof(devices));
for (dev = bus->devices; dev; dev = dev->next)
if (dev->devnum)
devices[dev->devnum] = dev;
/* Now fetch the children for each device */
for (dev = bus->devices; dev; dev = dev->next) {
struct usb_hub_portinfo portinfo;
int fd;
fd = device_open(dev);
if (fd < 0)
continue;
/* Query the hub driver for the children of this device */
if (dev->config && dev->config->interface && dev->config->interface->altsetting)
command.ifno = dev->config->interface->altsetting->bInterfaceNumber;
else
command.ifno = 0;
command.ioctl_code = IOCTL_USB_HUB_PORTINFO;
command.data = &portinfo;
ret = ioctl(fd, IOCTL_USB_IOCTL, &command);
if (ret < 0) {
/* errno == ENOSYS means the device probably wasn't a hub */
if (errno != ENOSYS && usb_debug > 1)
fprintf(stderr, "error obtaining child information: %s\n",
strerror(errno));
close(fd);
continue;
}
dev->num_children = 0;
for (i = 0; i < portinfo.numports; i++)
if (portinfo.port[i])
dev->num_children++;
/* Free any old children first */
free(dev->children);
dev->children = malloc(sizeof(struct usb_device *) * dev->num_children);
if (!dev->children) {
if (usb_debug > 1)
fprintf(stderr, "error allocating %zu bytes memory for dev->children\n",
sizeof(struct usb_device *) * dev->num_children);
dev->num_children = 0;
close(fd);
continue;
}
for (i = 0, i1 = 0; i < portinfo.numports; i++) {
if (!portinfo.port[i])
continue;
dev->children[i1++] = devices[portinfo.port[i]];
devices[portinfo.port[i]] = NULL;
}
close(fd);
}
/*
* There should be one device left in the devices list and that should be
* the root device
*/
for (i = 0; i < sizeof(devices) / sizeof(devices[0]); i++) {
if (devices[i])
bus->root_dev = devices[i];
}
return 0;
}
static int check_usb_vfs(const char *dirname)
{
DIR *dir;
struct dirent *entry;
int found = 0;
dir = opendir(dirname);
if (!dir)
return 0;
while ((entry = readdir(dir)) != NULL) {
/* Skip anything starting with a . */
if (entry->d_name[0] == '.')
continue;
/* We assume if we find any files that it must be the right place */
found = 1;
break;
}
closedir(dir);
return found;
}
void usb_os_init(void)
{
/* Find the path to the virtual filesystem */
if (getenv("USB_DEVFS_PATH")) {
if (check_usb_vfs(getenv("USB_DEVFS_PATH"))) {
strncpy(usb_path, getenv("USB_DEVFS_PATH"), sizeof(usb_path) - 1);
usb_path[sizeof(usb_path) - 1] = 0;
} else if (usb_debug)
fprintf(stderr, "usb_os_init: couldn't find USB VFS in USB_DEVFS_PATH\n");
}
if (!usb_path[0]) {
if (check_usb_vfs("/dev/bus/usb")) {
strncpy(usb_path, "/dev/bus/usb", sizeof(usb_path) - 1);
usb_path[sizeof(usb_path) - 1] = 0;
} else if (check_usb_vfs("/proc/bus/usb")) {
strncpy(usb_path, "/proc/bus/usb", sizeof(usb_path) - 1);
usb_path[sizeof(usb_path) - 1] = 0;
} else
usb_path[0] = 0; /* No path, no USB support */
}
if (usb_debug) {
if (usb_path[0])
fprintf(stderr, "usb_os_init: Found USB VFS at %s\n", usb_path);
else
fprintf(stderr, "usb_os_init: No USB VFS found, is it mounted?\n");
}
}
int usb_resetep(usb_dev_handle *dev, unsigned int ep)
{
int ret;
ret = ioctl(dev->fd, IOCTL_USB_RESETEP, &ep);
if (ret)
USB_ERROR_STR(-errno, "could not reset ep %d: %s", ep,
strerror(errno));
return 0;
}
int usb_clear_halt(usb_dev_handle *dev, unsigned int ep)
{
int ret;
ret = ioctl(dev->fd, IOCTL_USB_CLEAR_HALT, &ep);
if (ret)
USB_ERROR_STR(-errno, "could not clear/halt ep %d: %s", ep,
strerror(errno));
return 0;
}
int usb_reset(usb_dev_handle *dev)
{
int ret;
ret = ioctl(dev->fd, IOCTL_USB_RESET, NULL);
if (ret)
USB_ERROR_STR(-errno, "could not reset: %s", strerror(errno));
return 0;
}
int usb_get_driver_np(usb_dev_handle *dev, int interface, char *name,
unsigned int namelen)
{
struct usb_getdriver getdrv;
int ret;
getdrv.interface = interface;
ret = ioctl(dev->fd, IOCTL_USB_GETDRIVER, &getdrv);
if (ret)
USB_ERROR_STR(-errno, "could not get bound driver: %s", strerror(errno));
strncpy(name, getdrv.driver, namelen - 1);
name[namelen - 1] = 0;
return 0;
}
int usb_detach_kernel_driver_np(usb_dev_handle *dev, int interface)
{
struct usb_ioctl command;
int ret;
command.ifno = interface;
command.ioctl_code = IOCTL_USB_DISCONNECT;
command.data = NULL;
ret = ioctl(dev->fd, IOCTL_USB_IOCTL, &command);
if (ret)
USB_ERROR_STR(-errno, "could not detach kernel driver from interface %d: %s",
interface, strerror(errno));
return 0;
}
|