third_party/libusb/src/libusb/os/openbsd

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This source file includes following definitions.
obsd_get_device_list
obsd_open
obsd_close
obsd_get_device_descriptor
obsd_get_active_config_descriptor
obsd_get_config_descriptor
obsd_get_configuration
obsd_set_configuration
obsd_claim_interface
obsd_release_interface
obsd_set_interface_altsetting
obsd_clear_halt
obsd_reset_device
obsd_destroy_device
obsd_submit_transfer
obsd_cancel_transfer
obsd_clear_transfer_priv
obsd_handle_events
obsd_clock_gettime
_errno_to_libusb
_cache_active_config_descriptor
_sync_control_transfer
_access_endpoint
_sync_gen_transfer
_bus_open
/*
 * Copyright © 2011-2013 Martin Pieuchot <mpi@openbsd.org>
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

#include <sys/time.h>
#include <sys/types.h>

#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include <dev/usb/usb.h>

#include "libusb.h"
#include "libusbi.h"

struct device_priv {
        char *devname;                          /* name of the ugen(4) node */
        int fd;                                 /* device file descriptor */

        unsigned char *cdesc;                   /* active config descriptor */
        usb_device_descriptor_t ddesc;          /* usb device descriptor */
};

struct handle_priv {
        int pipe[2];                            /* for event notification */
        int endpoints[USB_MAX_ENDPOINTS];
};

/*
 * Backend functions
 */
static int obsd_get_device_list(struct libusb_context *,
    struct discovered_devs **);
static int obsd_open(struct libusb_device_handle *);
static void obsd_close(struct libusb_device_handle *);

static int obsd_get_device_descriptor(struct libusb_device *, unsigned char *,
    int *);
static int obsd_get_active_config_descriptor(struct libusb_device *,
    unsigned char *, size_t, int *);
static int obsd_get_config_descriptor(struct libusb_device *, uint8_t,
    unsigned char *, size_t, int *);

static int obsd_get_configuration(struct libusb_device_handle *, int *);
static int obsd_set_configuration(struct libusb_device_handle *, int);

static int obsd_claim_interface(struct libusb_device_handle *, int);
static int obsd_release_interface(struct libusb_device_handle *, int);

static int obsd_set_interface_altsetting(struct libusb_device_handle *, int,
    int);
static int obsd_clear_halt(struct libusb_device_handle *, unsigned char);
static int obsd_reset_device(struct libusb_device_handle *);
static void obsd_destroy_device(struct libusb_device *);

static int obsd_submit_transfer(struct usbi_transfer *);
static int obsd_cancel_transfer(struct usbi_transfer *);
static void obsd_clear_transfer_priv(struct usbi_transfer *);
static int obsd_handle_events(struct libusb_context *ctx, struct pollfd *,
    nfds_t, int);
static int obsd_clock_gettime(int, struct timespec *);

/*
 * Private functions
 */
static int _errno_to_libusb(int);
static int _cache_active_config_descriptor(struct libusb_device *);
static int _sync_control_transfer(struct usbi_transfer *);
static int _sync_gen_transfer(struct usbi_transfer *);
static int _access_endpoint(struct libusb_transfer *);

static int _bus_open(int);


const struct usbi_os_backend openbsd_backend = {
        "Synchronous OpenBSD backend",
        0,
        NULL,                           /* init() */
        NULL,                           /* exit() */
        obsd_get_device_list,
        NULL,                           /* hotplug_poll */
        obsd_open,
        obsd_close,

        obsd_get_device_descriptor,
        obsd_get_active_config_descriptor,
        obsd_get_config_descriptor,
        NULL,                           /* get_config_descriptor_by_value() */

        obsd_get_configuration,
        obsd_set_configuration,

        obsd_claim_interface,
        obsd_release_interface,

        obsd_set_interface_altsetting,
        obsd_clear_halt,
        obsd_reset_device,

        NULL,                           /* kernel_driver_active() */
        NULL,                           /* detach_kernel_driver() */
        NULL,                           /* attach_kernel_driver() */

        obsd_destroy_device,

        obsd_submit_transfer,
        obsd_cancel_transfer,
        obsd_clear_transfer_priv,

        obsd_handle_events,

        obsd_clock_gettime,
        sizeof(struct device_priv),
        sizeof(struct handle_priv),
        0,                              /* transfer_priv_size */
        0,                              /* add_iso_packet_size */
};

#define DEVPATH "/dev/"
#define USBDEV  DEVPATH "usb"

int
obsd_get_device_list(struct libusb_context * ctx,
        struct discovered_devs **discdevs)
{
        struct discovered_devs *ddd;
        struct libusb_device *dev;
        struct device_priv *dpriv;
        struct usb_device_info di;
        struct usb_device_ddesc dd;
        unsigned long session_id;
        char devices[USB_MAX_DEVICES];
        char busnode[16];
        char *udevname;
        int fd, addr, i, j;

        usbi_dbg("");

        for (i = 0; i < 8; i++) {
                snprintf(busnode, sizeof(busnode), USBDEV "%d", i);

                if ((fd = open(busnode, O_RDWR)) < 0) {
                        if (errno != ENOENT && errno != ENXIO)
                                usbi_err(ctx, "could not open %s", busnode);
                        continue;
                }

                bzero(devices, sizeof(devices));
                for (addr = 1; addr < USB_MAX_DEVICES; addr++) {
                        if (devices[addr])
                                continue;

                        di.udi_addr = addr;
                        if (ioctl(fd, USB_DEVICEINFO, &di) < 0)
                                continue;

                        /*
                         * XXX If ugen(4) is attached to the USB device
                         * it will be used.
                         */
                        udevname = NULL;
                        for (j = 0; j < USB_MAX_DEVNAMES; j++)
                                if (!strncmp("ugen", di.udi_devnames[j], 4)) {
                                        udevname = strdup(di.udi_devnames[j]);
                                        break;
                                }

                        session_id = (di.udi_bus << 8 | di.udi_addr);
                        dev = usbi_get_device_by_session_id(ctx, session_id);

                        if (dev == NULL) {
                                dev = usbi_alloc_device(ctx, session_id);
                                if (dev == NULL) {
                                        close(fd);
                                        return (LIBUSB_ERROR_NO_MEM);
                                }

                                dev->bus_number = di.udi_bus;
                                dev->device_address = di.udi_addr;
                                dev->speed = di.udi_speed;

                                dpriv = (struct device_priv *)dev->os_priv;
                                dpriv->fd = -1;
                                dpriv->cdesc = NULL;
                                dpriv->devname = udevname;

                                dd.udd_bus = di.udi_bus;
                                dd.udd_addr = di.udi_addr;
                                if (ioctl(fd, USB_DEVICE_GET_DDESC, &dd) < 0) {
                                        libusb_unref_device(dev);
                                        continue;
                                }
                                dpriv->ddesc = dd.udd_desc;

                                if (_cache_active_config_descriptor(dev)) {
                                        libusb_unref_device(dev);
                                        continue;
                                }

                                if (usbi_sanitize_device(dev))
                                        libusb_unref_device(dev);
                        }

                        ddd = discovered_devs_append(*discdevs, dev);
                        if (ddd == NULL) {
                                close(fd);
                                return (LIBUSB_ERROR_NO_MEM);
                        }

                        *discdevs = ddd;
                        devices[addr] = 1;
                }

                close(fd);
        }

        return (LIBUSB_SUCCESS);
}

int
obsd_open(struct libusb_device_handle *handle)
{
        struct handle_priv *hpriv = (struct handle_priv *)handle->os_priv;
        struct device_priv *dpriv = (struct device_priv *)handle->dev->os_priv;
        char devnode[16];

        if (dpriv->devname) {
                /*
                 * Only open ugen(4) attached devices read-write, all
                 * read-only operations are done through the bus node.
                 */
                snprintf(devnode, sizeof(devnode), DEVPATH "%s.00",
                    dpriv->devname);
                dpriv->fd = open(devnode, O_RDWR);
                if (dpriv->fd < 0)
                        return _errno_to_libusb(errno);

                usbi_dbg("open %s: fd %d", devnode, dpriv->fd);
        }

        if (pipe(hpriv->pipe) < 0)
                return _errno_to_libusb(errno);

        return usbi_add_pollfd(HANDLE_CTX(handle), hpriv->pipe[0], POLLIN);
}

void
obsd_close(struct libusb_device_handle *handle)
{
        struct handle_priv *hpriv = (struct handle_priv *)handle->os_priv;
        struct device_priv *dpriv = (struct device_priv *)handle->dev->os_priv;

        if (dpriv->devname) {
                usbi_dbg("close: fd %d", dpriv->fd);

                close(dpriv->fd);
                dpriv->fd = -1;
        }

        usbi_remove_pollfd(HANDLE_CTX(handle), hpriv->pipe[0]);

        close(hpriv->pipe[0]);
        close(hpriv->pipe[1]);
}

int
obsd_get_device_descriptor(struct libusb_device *dev, unsigned char *buf,
    int *host_endian)
{
        struct device_priv *dpriv = (struct device_priv *)dev->os_priv;

        usbi_dbg("");

        memcpy(buf, &dpriv->ddesc, DEVICE_DESC_LENGTH);

        *host_endian = 0;

        return (LIBUSB_SUCCESS);
}

int
obsd_get_active_config_descriptor(struct libusb_device *dev,
    unsigned char *buf, size_t len, int *host_endian)
{
        struct device_priv *dpriv = (struct device_priv *)dev->os_priv;
        usb_config_descriptor_t *ucd = (usb_config_descriptor_t *)dpriv->cdesc;

        len = MIN(len, UGETW(ucd->wTotalLength));

        usbi_dbg("len %d", len);

        memcpy(buf, dpriv->cdesc, len);

        *host_endian = 0;

        return (len);
}

int
obsd_get_config_descriptor(struct libusb_device *dev, uint8_t idx,
    unsigned char *buf, size_t len, int *host_endian)
{
        struct usb_device_fdesc udf;
        int fd, err;

        if ((fd = _bus_open(dev->bus_number)) < 0)
                return _errno_to_libusb(errno);

        udf.udf_bus = dev->bus_number;
        udf.udf_addr = dev->device_address;
        udf.udf_config_index = idx;
        udf.udf_size = len;
        udf.udf_data = buf;

        usbi_dbg("index %d, len %d", udf.udf_config_index, len);

        if (ioctl(fd, USB_DEVICE_GET_FDESC, &udf) < 0) {
                err = errno;
                close(fd);
                return _errno_to_libusb(err);
        }
        close(fd);

        *host_endian = 0;

        return (len);
}

int
obsd_get_configuration(struct libusb_device_handle *handle, int *config)
{
        struct device_priv *dpriv = (struct device_priv *)handle->dev->os_priv;
        usb_config_descriptor_t *ucd = (usb_config_descriptor_t *)dpriv->cdesc;

        *config = ucd->bConfigurationValue;

        usbi_dbg("bConfigurationValue %d", *config);

        return (LIBUSB_SUCCESS);
}

int
obsd_set_configuration(struct libusb_device_handle *handle, int config)
{
        struct device_priv *dpriv = (struct device_priv *)handle->dev->os_priv;

        if (dpriv->devname == NULL)
                return (LIBUSB_ERROR_NOT_SUPPORTED);

        usbi_dbg("bConfigurationValue %d", config);

        if (ioctl(dpriv->fd, USB_SET_CONFIG, &config) < 0)
                return _errno_to_libusb(errno);

        return _cache_active_config_descriptor(handle->dev);
}

int
obsd_claim_interface(struct libusb_device_handle *handle, int iface)
{
        struct handle_priv *hpriv = (struct handle_priv *)handle->os_priv;
        int i;

        for (i = 0; i < USB_MAX_ENDPOINTS; i++)
                hpriv->endpoints[i] = -1;

        return (LIBUSB_SUCCESS);
}

int
obsd_release_interface(struct libusb_device_handle *handle, int iface)
{
        struct handle_priv *hpriv = (struct handle_priv *)handle->os_priv;
        int i;

        for (i = 0; i < USB_MAX_ENDPOINTS; i++)
                if (hpriv->endpoints[i] >= 0)
                        close(hpriv->endpoints[i]);

        return (LIBUSB_SUCCESS);
}

int
obsd_set_interface_altsetting(struct libusb_device_handle *handle, int iface,
    int altsetting)
{
        struct device_priv *dpriv = (struct device_priv *)handle->dev->os_priv;
        struct usb_alt_interface intf;

        if (dpriv->devname == NULL)
                return (LIBUSB_ERROR_NOT_SUPPORTED);

        usbi_dbg("iface %d, setting %d", iface, altsetting);

        memset(&intf, 0, sizeof(intf));

        intf.uai_interface_index = iface;
        intf.uai_alt_no = altsetting;

        if (ioctl(dpriv->fd, USB_SET_ALTINTERFACE, &intf) < 0)
                return _errno_to_libusb(errno);

        return (LIBUSB_SUCCESS);
}

int
obsd_clear_halt(struct libusb_device_handle *handle, unsigned char endpoint)
{
        struct usb_ctl_request req;
        int fd, err;

        if ((fd = _bus_open(handle->dev->bus_number)) < 0)
                return _errno_to_libusb(errno);

        usbi_dbg("");

        req.ucr_addr = handle->dev->device_address;
        req.ucr_request.bmRequestType = UT_WRITE_ENDPOINT;
        req.ucr_request.bRequest = UR_CLEAR_FEATURE;
        USETW(req.ucr_request.wValue, UF_ENDPOINT_HALT);
        USETW(req.ucr_request.wIndex, endpoint);
        USETW(req.ucr_request.wLength, 0);

        if (ioctl(fd, USB_REQUEST, &req) < 0) {
                err = errno;
                close(fd);
                return _errno_to_libusb(err);
        }
        close(fd);

        return (LIBUSB_SUCCESS);
}

int
obsd_reset_device(struct libusb_device_handle *handle)
{
        usbi_dbg("");

        return (LIBUSB_ERROR_NOT_SUPPORTED);
}

void
obsd_destroy_device(struct libusb_device *dev)
{
        struct device_priv *dpriv = (struct device_priv *)dev->os_priv;

        usbi_dbg("");

        free(dpriv->cdesc);
        free(dpriv->devname);
}

int
obsd_submit_transfer(struct usbi_transfer *itransfer)
{
        struct libusb_transfer *transfer;
        struct handle_priv *hpriv;
        int err = 0;

        usbi_dbg("");

        transfer = USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
        hpriv = (struct handle_priv *)transfer->dev_handle->os_priv;

        switch (transfer->type) {
        case LIBUSB_TRANSFER_TYPE_CONTROL:
                err = _sync_control_transfer(itransfer);
                break;
        case LIBUSB_TRANSFER_TYPE_ISOCHRONOUS:
                if (IS_XFEROUT(transfer)) {
                        /* Isochronous write is not supported */
                        err = LIBUSB_ERROR_NOT_SUPPORTED;
                        break;
                }
                err = _sync_gen_transfer(itransfer);
                break;
        case LIBUSB_TRANSFER_TYPE_BULK:
        case LIBUSB_TRANSFER_TYPE_INTERRUPT:
                if (IS_XFEROUT(transfer) &&
                    transfer->flags & LIBUSB_TRANSFER_ADD_ZERO_PACKET) {
                        err = LIBUSB_ERROR_NOT_SUPPORTED;
                        break;
                }
                err = _sync_gen_transfer(itransfer);
                break;
        }

        if (err)
                return (err);

        if (write(hpriv->pipe[1], &itransfer, sizeof(itransfer)) < 0)
                return _errno_to_libusb(errno);

        return (LIBUSB_SUCCESS);
}

int
obsd_cancel_transfer(struct usbi_transfer *itransfer)
{
        usbi_dbg("");

        return (LIBUSB_ERROR_NOT_SUPPORTED);
}

void
obsd_clear_transfer_priv(struct usbi_transfer *itransfer)
{
        usbi_dbg("");

        /* Nothing to do */
}

int
obsd_handle_events(struct libusb_context *ctx, struct pollfd *fds, nfds_t nfds,
    int num_ready)
{
        struct libusb_device_handle *handle;
        struct handle_priv *hpriv = NULL;
        struct usbi_transfer *itransfer;
        struct pollfd *pollfd;
        int i, err = 0;

        usbi_dbg("");

        pthread_mutex_lock(&ctx->open_devs_lock);
        for (i = 0; i < nfds && num_ready > 0; i++) {
                pollfd = &fds[i];

                if (!pollfd->revents)
                        continue;

                hpriv = NULL;
                num_ready--;
                list_for_each_entry(handle, &ctx->open_devs, list,
                    struct libusb_device_handle) {
                        hpriv = (struct handle_priv *)handle->os_priv;

                        if (hpriv->pipe[0] == pollfd->fd)
                                break;

                        hpriv = NULL;
                }

                if (NULL == hpriv) {
                        usbi_dbg("fd %d is not an event pipe!", pollfd->fd);
                        err = ENOENT;
                        break;
                }

                if (pollfd->revents & POLLERR) {
                        usbi_remove_pollfd(HANDLE_CTX(handle), hpriv->pipe[0]);
                        usbi_handle_disconnect(handle);
                        continue;
                }

                if (read(hpriv->pipe[0], &itransfer, sizeof(itransfer)) < 0) {
                        err = errno;
                        break;
                }

                if ((err = usbi_handle_transfer_completion(itransfer,
                    LIBUSB_TRANSFER_COMPLETED)))
                        break;
        }
        pthread_mutex_unlock(&ctx->open_devs_lock);

        if (err)
                return _errno_to_libusb(err);

        return (LIBUSB_SUCCESS);
}

int
obsd_clock_gettime(int clkid, struct timespec *tp)
{
        usbi_dbg("clock %d", clkid);

        if (clkid == USBI_CLOCK_REALTIME)
                return clock_gettime(CLOCK_REALTIME, tp);

        if (clkid == USBI_CLOCK_MONOTONIC)
                return clock_gettime(CLOCK_MONOTONIC, tp);

        return (LIBUSB_ERROR_INVALID_PARAM);
}

int
_errno_to_libusb(int err)
{
        usbi_dbg("error: %s (%d)", strerror(err), err);

        switch (err) {
        case EIO:
                return (LIBUSB_ERROR_IO);
        case EACCES:
                return (LIBUSB_ERROR_ACCESS);
        case ENOENT:
                return (LIBUSB_ERROR_NO_DEVICE);
        case ENOMEM:
                return (LIBUSB_ERROR_NO_MEM);
        case ETIMEDOUT:
                return (LIBUSB_ERROR_TIMEOUT);
        }

        return (LIBUSB_ERROR_OTHER);
}

int
_cache_active_config_descriptor(struct libusb_device *dev)
{
        struct device_priv *dpriv = (struct device_priv *)dev->os_priv;
        struct usb_device_cdesc udc;
        struct usb_device_fdesc udf;
        unsigned char* buf;
        int fd, len, err;

        if ((fd = _bus_open(dev->bus_number)) < 0)
                return _errno_to_libusb(errno);

        usbi_dbg("fd %d, addr %d", fd, dev->device_address);

        udc.udc_bus = dev->bus_number;
        udc.udc_addr = dev->device_address;
        udc.udc_config_index = USB_CURRENT_CONFIG_INDEX;
        if (ioctl(fd, USB_DEVICE_GET_CDESC, &udc) < 0) {
                err = errno;
                close(fd);
                return _errno_to_libusb(errno);
        }

        usbi_dbg("active bLength %d", udc.udc_desc.bLength);

        len = UGETW(udc.udc_desc.wTotalLength);
        buf = malloc(len);
        if (buf == NULL)
                return (LIBUSB_ERROR_NO_MEM);

        udf.udf_bus = dev->bus_number;
        udf.udf_addr = dev->device_address;
        udf.udf_config_index = udc.udc_config_index;
        udf.udf_size = len;
        udf.udf_data = buf;

        usbi_dbg("index %d, len %d", udf.udf_config_index, len);

        if (ioctl(fd, USB_DEVICE_GET_FDESC, &udf) < 0) {
                err = errno;
                close(fd);
                free(buf);
                return _errno_to_libusb(err);
        }
        close(fd);

        if (dpriv->cdesc)
                free(dpriv->cdesc);
        dpriv->cdesc = buf;

        return (LIBUSB_SUCCESS);
}

int
_sync_control_transfer(struct usbi_transfer *itransfer)
{
        struct libusb_transfer *transfer;
        struct libusb_control_setup *setup;
        struct device_priv *dpriv;
        struct usb_ctl_request req;

        transfer = USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
        dpriv = (struct device_priv *)transfer->dev_handle->dev->os_priv;
        setup = (struct libusb_control_setup *)transfer->buffer;

        usbi_dbg("type %x request %x value %x index %d length %d timeout %d",
            setup->bmRequestType, setup->bRequest,
            libusb_le16_to_cpu(setup->wValue),
            libusb_le16_to_cpu(setup->wIndex),
            libusb_le16_to_cpu(setup->wLength), transfer->timeout);

        req.ucr_addr = transfer->dev_handle->dev->device_address;
        req.ucr_request.bmRequestType = setup->bmRequestType;
        req.ucr_request.bRequest = setup->bRequest;
        /* Don't use USETW, libusbx already deals with the endianness */
        (*(uint16_t *)req.ucr_request.wValue) = setup->wValue;
        (*(uint16_t *)req.ucr_request.wIndex) = setup->wIndex;
        (*(uint16_t *)req.ucr_request.wLength) = setup->wLength;
        req.ucr_data = transfer->buffer + LIBUSB_CONTROL_SETUP_SIZE;

        if ((transfer->flags & LIBUSB_TRANSFER_SHORT_NOT_OK) == 0)
                req.ucr_flags = USBD_SHORT_XFER_OK;

        if (dpriv->devname == NULL) {
                /*
                 * XXX If the device is not attached to ugen(4) it is
                 * XXX still possible to submit a control transfer but
                 * XXX with the default timeout only.
                 */
                int fd, err;

                if ((fd = _bus_open(transfer->dev_handle->dev->bus_number)) < 0)
                        return _errno_to_libusb(errno);

                if ((ioctl(fd, USB_REQUEST, &req)) < 0) {
                        err = errno;
                        close(fd);
                        return _errno_to_libusb(err);
                }
                close(fd);
        } else {
                if ((ioctl(dpriv->fd, USB_SET_TIMEOUT, &transfer->timeout)) < 0)
                        return _errno_to_libusb(errno);

                if ((ioctl(dpriv->fd, USB_DO_REQUEST, &req)) < 0)
                        return _errno_to_libusb(errno);
        }

        itransfer->transferred = req.ucr_actlen;

        usbi_dbg("transferred %d", itransfer->transferred);

        return (0);
}

int
_access_endpoint(struct libusb_transfer *transfer)
{
        struct handle_priv *hpriv;
        struct device_priv *dpriv;
        char devnode[16];
        int fd, endpt;
        mode_t mode;

        hpriv = (struct handle_priv *)transfer->dev_handle->os_priv;
        dpriv = (struct device_priv *)transfer->dev_handle->dev->os_priv;

        endpt = UE_GET_ADDR(transfer->endpoint);
        mode = IS_XFERIN(transfer) ? O_RDONLY : O_WRONLY;

        usbi_dbg("endpoint %d mode %d", endpt, mode);

        if (hpriv->endpoints[endpt] < 0) {
                /* Pick the right endpoint node */
                snprintf(devnode, sizeof(devnode), DEVPATH "%s.%02d",
                    dpriv->devname, endpt);

                /* We may need to read/write to the same endpoint later. */
                if (((fd = open(devnode, O_RDWR)) < 0) && (errno == ENXIO))
                        if ((fd = open(devnode, mode)) < 0)
                                return (-1);

                hpriv->endpoints[endpt] = fd;
        }

        return (hpriv->endpoints[endpt]);
}

int
_sync_gen_transfer(struct usbi_transfer *itransfer)
{
        struct libusb_transfer *transfer;
        struct device_priv *dpriv;
        int fd, nr = 1;

        transfer = USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
        dpriv = (struct device_priv *)transfer->dev_handle->dev->os_priv;

        if (dpriv->devname == NULL)
                return (LIBUSB_ERROR_NOT_SUPPORTED);

        /*
         * Bulk, Interrupt or Isochronous transfer depends on the
         * endpoint and thus the node to open.
         */
        if ((fd = _access_endpoint(transfer)) < 0)
                return _errno_to_libusb(errno);

        if ((ioctl(fd, USB_SET_TIMEOUT, &transfer->timeout)) < 0)
                return _errno_to_libusb(errno);

        if (IS_XFERIN(transfer)) {
                if ((transfer->flags & LIBUSB_TRANSFER_SHORT_NOT_OK) == 0)
                        if ((ioctl(fd, USB_SET_SHORT_XFER, &nr)) < 0)
                                return _errno_to_libusb(errno);

                nr = read(fd, transfer->buffer, transfer->length);
        } else {
                nr = write(fd, transfer->buffer, transfer->length);
        }

        if (nr < 0)
                return _errno_to_libusb(errno);

        itransfer->transferred = nr;

        return (0);
}

int
_bus_open(int number)
{
        char busnode[16];

        snprintf(busnode, sizeof(busnode), USBDEV "%d", number);

        return open(busnode, O_RDWR);
}
/* [<][>][^][v][top][bottom][index][help] */
root/third_party/libusb/src/libusb/os/openbsd_usb.c

DEFINITIONS
