1 files changed, 0 insertions, 1545 deletions

diff --git a/libusb-1.0/libusb/os/darwin_usb.c b/libusb-1.0/libusb/os/darwin_usb.c
deleted file mode 100644
index 646c938..0000000
--- a/libusb-1.0/libusb/os/darwin_usb.c
+++ /dev/null
@@ -1,1545 +0,0 @@
-/*
- * darwin backend for libusb 1.0
- * Copyright (C) 2008-2010 Nathan Hjelm <hjelmn@users.sourceforge.net>
- *
- * 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 <config.h>
-#include <ctype.h>
-#include <dirent.h>
-#include <errno.h>
-#include <fcntl.h>
-#include <pthread.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <sys/ioctl.h>
-#include <sys/stat.h>
-#include <sys/types.h>
-#include <unistd.h>
-
-#include <mach/clock.h>
-#include <mach/clock_types.h>
-#include <mach/mach_host.h>
-
-#include <mach/mach_port.h>
-#include <IOKit/IOCFBundle.h>
-#include <IOKit/usb/IOUSBLib.h>
-#include <IOKit/IOCFPlugIn.h>
-
-#include "darwin_usb.h"
-
-static mach_port_t  libusb_darwin_mp = 0; /* master port */
-static CFRunLoopRef libusb_darwin_acfl = NULL; /* async cf loop */
-static int initCount = 0;
-
-/* async event thread */
-static pthread_t libusb_darwin_at;
-
-static int darwin_get_config_descriptor(struct libusb_device *dev, uint8_t config_index, unsigned char *buffer, size_t len, int *host_endian);
-static int darwin_claim_interface(struct libusb_device_handle *dev_handle, int iface);
-static int darwin_release_interface(struct libusb_device_handle *dev_handle, int iface);
-static int darwin_reset_device(struct libusb_device_handle *dev_handle);
-static void darwin_async_io_callback (void *refcon, IOReturn result, void *arg0);
-
-static const char *darwin_error_str (int result) {
-  switch (result) {
-  case kIOReturnSuccess:
-    return "no error";
-  case kIOReturnNotOpen:
-    return "device not opened for exclusive access";
-  case kIOReturnNoDevice:
-    return "no connection to an IOService";
-  case kIOUSBNoAsyncPortErr:
-    return "no async port has been opened for interface";
-  case kIOReturnExclusiveAccess:
-    return "another process has device opened for exclusive access";
-  case kIOUSBPipeStalled:
-    return "pipe is stalled";
-  case kIOReturnError:
-    return "could not establish a connection to the Darwin kernel";
-  case kIOUSBTransactionTimeout:
-    return "transaction timed out";
-  case kIOReturnBadArgument:
-    return "invalid argument";
-  case kIOReturnAborted:
-    return "transaction aborted";
-  case kIOReturnNotResponding:
-    return "device not responding";
-  case kIOReturnOverrun:
-    return "data overrun";
-  case kIOReturnCannotWire:
-    return "physical memory can not be wired down";
-  default:
-    return "unknown error";
-  }
-}
-
-static int darwin_to_libusb (int result) {
-  switch (result) {
-  case kIOReturnUnderrun:
-  case kIOReturnSuccess:
-    return LIBUSB_SUCCESS;
-  case kIOReturnNotOpen:
-  case kIOReturnNoDevice:
-    return LIBUSB_ERROR_NO_DEVICE;
-  case kIOReturnExclusiveAccess:
-    return LIBUSB_ERROR_ACCESS;
-  case kIOUSBPipeStalled:
-    return LIBUSB_ERROR_PIPE;
-  case kIOReturnBadArgument:
-    return LIBUSB_ERROR_INVALID_PARAM;
-  case kIOUSBTransactionTimeout:
-    return LIBUSB_ERROR_TIMEOUT;
-  case kIOReturnNotResponding:
-  case kIOReturnAborted:
-  case kIOReturnError:
-  case kIOUSBNoAsyncPortErr:
-  default:
-    return LIBUSB_ERROR_OTHER;
-  }
-}
-
-
-static int ep_to_pipeRef(struct libusb_device_handle *dev_handle, uint8_t ep, uint8_t *pipep, uint8_t *ifcp) {
-  struct darwin_device_handle_priv *priv = (struct darwin_device_handle_priv *)dev_handle->os_priv;
-
-  /* current interface */
-  struct __darwin_interface *cInterface;
-
-  int8_t i, iface;
-
-  usbi_info (HANDLE_CTX(dev_handle), "converting ep address 0x%02x to pipeRef and interface", ep);
-
-  for (iface = 0 ; iface < USB_MAXINTERFACES ; iface++) {
-    cInterface = &priv->interfaces[iface];
-
-    if (dev_handle->claimed_interfaces & (1 << iface)) {
-      for (i = 0 ; i < cInterface->num_endpoints ; i++) {
-	if (cInterface->endpoint_addrs[i] == ep) {
-	  *pipep = i + 1;
-	  *ifcp = iface;
-	  usbi_info (HANDLE_CTX(dev_handle), "pipe %d on interface %d matches", *pipep, *ifcp);
-	  return 0;
-	}
-      }
-    }
-  }
-
-  /* No pipe found with the correct endpoint address */
-  usbi_warn (HANDLE_CTX(dev_handle), "no pipeRef found with endpoint address 0x%02x.", ep);
-
-  return -1;
-}
-
-static int usb_setup_device_iterator (io_iterator_t *deviceIterator) {
-  return IOServiceGetMatchingServices(libusb_darwin_mp, IOServiceMatching(kIOUSBDeviceClassName), deviceIterator);
-}
-
-static usb_device_t **usb_get_next_device (io_iterator_t deviceIterator, UInt32 *locationp) {
-  io_cf_plugin_ref_t *plugInInterface = NULL;
-  usb_device_t **device;
-  io_service_t usbDevice;
-  long result;
-  SInt32 score;
-
-  if (!IOIteratorIsValid (deviceIterator))
-    return NULL;
-
-
-  while ((usbDevice = IOIteratorNext(deviceIterator))) {
-    result = IOCreatePlugInInterfaceForService(usbDevice, kIOUSBDeviceUserClientTypeID,
-					       kIOCFPlugInInterfaceID, &plugInInterface,
-					       &score);
-    if (kIOReturnSuccess == result && plugInInterface)
-      break;
-
-    usbi_dbg ("libusb/darwin.c usb_get_next_device: could not set up plugin for service: %s\n", darwin_error_str (result));
-  }
-
-  if (!usbDevice)
-    return NULL;
-
-  (void)IOObjectRelease(usbDevice);
-  (void)(*plugInInterface)->QueryInterface(plugInInterface, CFUUIDGetUUIDBytes(DeviceInterfaceID),
-					   (LPVOID)&device);
-
-  (*plugInInterface)->Stop(plugInInterface);
-  IODestroyPlugInInterface (plugInInterface);
-
-  /* get the location from the device */
-  if (locationp)
-    (*(device))->GetLocationID(device, locationp);
-
-  return device;
-}
-
-static kern_return_t darwin_get_device (uint32_t dev_location, usb_device_t ***darwin_device) {
-  kern_return_t kresult;
-  UInt32        location;
-  io_iterator_t deviceIterator;
-
-  kresult = usb_setup_device_iterator (&deviceIterator);
-  if (kresult)
-    return kresult;
-
-  /* This port of libusb uses locations to keep track of devices. */
-  while ((*darwin_device = usb_get_next_device (deviceIterator, &location)) != NULL) {
-    if (location == dev_location)
-      break;
-
-    (**darwin_device)->Release(*darwin_device);
-  }
-
-  IOObjectRelease (deviceIterator);
-
-  if (!(*darwin_device))
-    return kIOReturnNoDevice;
-
-  return kIOReturnSuccess;
-}
-
-
-
-static void darwin_devices_detached (void *ptr, io_iterator_t rem_devices) {
-  struct libusb_context *ctx = (struct libusb_context *)ptr;
-  struct libusb_device_handle *handle;
-  struct darwin_device_priv *dpriv;
-  struct darwin_device_handle_priv *priv;
-
-  io_service_t device;
-  long location;
-  CFTypeRef locationCF;
-  UInt32 message;
-
-  usbi_info (ctx, "a device has been detached");
-
-  while ((device = IOIteratorNext (rem_devices)) != 0) {
-    /* get the location from the i/o registry */
-    locationCF = IORegistryEntryCreateCFProperty (device, CFSTR(kUSBDevicePropertyLocationID), kCFAllocatorDefault, 0);
-
-    CFNumberGetValue(locationCF, kCFNumberLongType, &location);
-    CFRelease (locationCF);
-    IOObjectRelease (device);
-
-    usbi_mutex_lock(&ctx->open_devs_lock);
-    list_for_each_entry(handle, &ctx->open_devs, list, struct libusb_device_handle) {
-      dpriv = (struct darwin_device_priv *)handle->dev->os_priv;
-
-      /* the device may have been opened several times. write to each handle's event descriptor */
-      if (dpriv->location == location  && handle->os_priv) {
-	priv  = (struct darwin_device_handle_priv *)handle->os_priv;
-
-	message = MESSAGE_DEVICE_GONE;
-	write (priv->fds[1], &message, sizeof (message));
-      }
-    }
-
-    usbi_mutex_unlock(&ctx->open_devs_lock);
-  }
-}
-
-static void darwin_clear_iterator (io_iterator_t iter) {
-  io_service_t device;
-
-  while ((device = IOIteratorNext (iter)) != 0)
-    IOObjectRelease (device);
-}
-
-static void *event_thread_main (void *arg0) {
-  IOReturn kresult;
-  struct libusb_context *ctx = (struct libusb_context *)arg0;
-
-  /* hotplug (device removal) source */
-  CFRunLoopSourceRef     libusb_notification_cfsource;
-  io_notification_port_t libusb_notification_port;
-  io_iterator_t          libusb_rem_device_iterator;
-
-  usbi_info (ctx, "creating hotplug event source");
-
-  CFRetain (CFRunLoopGetCurrent ());
-
-  /* add the notification port to the run loop */
-  libusb_notification_port     = IONotificationPortCreate (libusb_darwin_mp);
-  libusb_notification_cfsource = IONotificationPortGetRunLoopSource (libusb_notification_port);
-  CFRunLoopAddSource(CFRunLoopGetCurrent (), libusb_notification_cfsource, kCFRunLoopDefaultMode);
-
-  /* create notifications for removed devices */
-  kresult = IOServiceAddMatchingNotification (libusb_notification_port, kIOTerminatedNotification,
-					      IOServiceMatching(kIOUSBDeviceClassName),
-					      (IOServiceMatchingCallback)darwin_devices_detached,
-					      (void *)ctx, &libusb_rem_device_iterator);
-
-  if (kresult != kIOReturnSuccess) {
-    usbi_err (ctx, "could not add hotplug event source: %s", darwin_error_str (kresult));
-
-    pthread_exit ((void *)kresult);
-  }
-
-  /* arm notifiers */
-  darwin_clear_iterator (libusb_rem_device_iterator);
-
-  /* let the main thread know about the async runloop */
-  libusb_darwin_acfl = CFRunLoopGetCurrent ();
-
-  usbi_info (ctx, "thread ready to receive events");
-
-  /* run the runloop */
-  CFRunLoopRun();
-
-  usbi_info (ctx, "thread exiting");
-
-  /* delete notification port */
-  CFRunLoopSourceInvalidate (libusb_notification_cfsource);
-  IONotificationPortDestroy (libusb_notification_port);
-
-  CFRelease (CFRunLoopGetCurrent ());
-
-  libusb_darwin_acfl = NULL;
-
-  pthread_exit (0);
-}
-
-static int darwin_init(struct libusb_context *ctx) {
-  IOReturn kresult;
-
-  if (!(initCount++)) {
-    /* Create the master port for talking to IOKit */
-    if (!libusb_darwin_mp) {
-      kresult = IOMasterPort (MACH_PORT_NULL, &libusb_darwin_mp);
-
-      if (kresult != kIOReturnSuccess || !libusb_darwin_mp)
-	return darwin_to_libusb (kresult);
-    }
-
-    pthread_create (&libusb_darwin_at, NULL, event_thread_main, (void *)ctx);
-
-    while (!libusb_darwin_acfl)
-      usleep (10);
-  }
-
-  return 0;
-}
-
-static void darwin_exit (void) {
-  if (!(--initCount)) {
-    void *ret;
-
-    /* stop the async runloop */
-    CFRunLoopStop (libusb_darwin_acfl);
-    pthread_join (libusb_darwin_at, &ret);
-
-    if (libusb_darwin_mp)
-      mach_port_deallocate(mach_task_self(), libusb_darwin_mp);
-
-    libusb_darwin_mp = 0;
-  }
-}
-
-static int darwin_get_device_descriptor(struct libusb_device *dev, unsigned char *buffer, int *host_endian) {
-  struct darwin_device_priv *priv = (struct darwin_device_priv *)dev->os_priv;
-
-  /* return cached copy */
-  memmove (buffer, &(priv->dev_descriptor), DEVICE_DESC_LENGTH);
-
-  *host_endian = 0;
-
-  return 0;
-}
-
-static int get_configuration_index (struct libusb_device *dev, int config_value) {
-  struct darwin_device_priv *priv = (struct darwin_device_priv *)dev->os_priv;
-  UInt8 i, numConfig;
-  IOUSBConfigurationDescriptorPtr desc;
-  IOReturn kresult;
-
-  /* is there a simpler way to determine the index? */
-  kresult = (*(priv->device))->GetNumberOfConfigurations (priv->device, &numConfig);
-  if (kresult != kIOReturnSuccess)
-    return darwin_to_libusb (kresult);
-
-  for (i = 0 ; i < numConfig ; i++) {
-    (*(priv->device))->GetConfigurationDescriptorPtr (priv->device, i, &desc);
-
-    if (desc->bConfigurationValue == config_value)
-      return i;
-  }
-
-  /* configuration not found */
-  return LIBUSB_ERROR_OTHER;
-}
-
-static int darwin_get_active_config_descriptor(struct libusb_device *dev, unsigned char *buffer, size_t len, int *host_endian) {
-  struct darwin_device_priv *priv = (struct darwin_device_priv *)dev->os_priv;
-  int config_index;
-
-  if (0 == priv->active_config)
-    return LIBUSB_ERROR_INVALID_PARAM;
-
-  config_index = get_configuration_index (dev, priv->active_config);
-  if (config_index < 0)
-    return config_index;
-
-  return darwin_get_config_descriptor (dev, config_index, buffer, len, host_endian);
-}
-
-static int darwin_get_config_descriptor(struct libusb_device *dev, uint8_t config_index, unsigned char *buffer, size_t len, int *host_endian) {
-  struct darwin_device_priv *priv = (struct darwin_device_priv *)dev->os_priv;
-  IOUSBConfigurationDescriptorPtr desc;
-  IOReturn kresult;
-  usb_device_t **device = NULL;
-
-  if (!priv)
-    return LIBUSB_ERROR_OTHER;
-
-  if (!priv->device) {
-    kresult = darwin_get_device (priv->location, &device);
-    if (kresult || !device) {
-      usbi_err (DEVICE_CTX (dev), "could not find device: %s", darwin_error_str (kresult));
-
-      return darwin_to_libusb (kresult);
-    }
-
-    /* don't have to open the device to get a config descriptor */
-  } else
-    device = priv->device;
-
-  kresult = (*device)->GetConfigurationDescriptorPtr (device, config_index, &desc);
-  if (kresult == kIOReturnSuccess) {
-    /* copy descriptor */
-    if (libusb_le16_to_cpu(desc->wTotalLength) < len)
-      len = libusb_le16_to_cpu(desc->wTotalLength);
-
-    memmove (buffer, desc, len);
-
-    /* GetConfigurationDescriptorPtr returns the descriptor in USB bus order */
-    *host_endian = 0;
-  }
-
-  if (!priv->device)
-    (*device)->Release (device);
-
-  return darwin_to_libusb (kresult);
-}
-
-/* check whether the os has configured the device */
-static int darwin_check_configuration (struct libusb_context *ctx, struct libusb_device *dev, usb_device_t **darwin_device) {
-  struct darwin_device_priv *priv = (struct darwin_device_priv *)dev->os_priv;
-
-  IOUSBConfigurationDescriptorPtr configDesc;
-  IOUSBFindInterfaceRequest request;
-  kern_return_t             kresult;
-  io_iterator_t             interface_iterator;
-  io_service_t              firstInterface;
-
-  if (priv->dev_descriptor.bNumConfigurations < 1) {
-    usbi_err (ctx, "device has no configurations");
-    return LIBUSB_ERROR_OTHER; /* no configurations at this speed so we can't use it */
-  }
-
-  /* find the first configuration */
-  kresult = (*darwin_device)->GetConfigurationDescriptorPtr (darwin_device, 0, &configDesc);
-  priv->first_config = (kIOReturnSuccess == kresult) ? configDesc->bConfigurationValue : 1;
-
-  /* check if the device is already configured. there is probably a better way than iterating over the
-     to accomplish this (the trick is we need to avoid a call to GetConfigurations since buggy devices
-     might lock up on the device request) */
-
-  /* Setup the Interface Request */
-  request.bInterfaceClass    = kIOUSBFindInterfaceDontCare;
-  request.bInterfaceSubClass = kIOUSBFindInterfaceDontCare;
-  request.bInterfaceProtocol = kIOUSBFindInterfaceDontCare;
-  request.bAlternateSetting  = kIOUSBFindInterfaceDontCare;
-
-  kresult = (*(darwin_device))->CreateInterfaceIterator(darwin_device, &request, &interface_iterator);
-  if (kresult)
-    return darwin_to_libusb (kresult);
-
-  /* iterate once */
-  firstInterface = IOIteratorNext(interface_iterator);
-
-  /* done with the interface iterator */
-  IOObjectRelease(interface_iterator);
-
-  if (firstInterface) {
-    IOObjectRelease (firstInterface);
-
-    /* device is configured */
-    if (priv->dev_descriptor.bNumConfigurations == 1)
-      /* to avoid problems with some devices get the configurations value from the configuration descriptor */
-      priv->active_config = priv->first_config;
-    else
-      /* devices with more than one configuration should work with GetConfiguration */
-      (*darwin_device)->GetConfiguration (darwin_device, &priv->active_config);
-  } else
-    /* not configured */
-    priv->active_config = 0;
-  
-  usbi_info (ctx, "active config: %u, first config: %u", priv->active_config, priv->first_config);
-
-  return 0;
-}
-
-static int process_new_device (struct libusb_context *ctx, usb_device_t **device, UInt32 locationID, struct discovered_devs **_discdevs) {
-  struct darwin_device_priv *priv;
-  struct libusb_device *dev;
-  struct discovered_devs *discdevs;
-  UInt16                address, idVendor, idProduct;
-  UInt8                 bDeviceClass, bDeviceSubClass;
-  IOUSBDevRequest      req;
-  int ret = 0, need_unref = 0;
-
-  do {
-    dev = usbi_get_device_by_session_id(ctx, locationID);
-    if (!dev) {
-      usbi_info (ctx, "allocating new device for location 0x%08x", locationID);
-      dev = usbi_alloc_device(ctx, locationID);
-      need_unref = 1;
-    } else
-      usbi_info (ctx, "using existing device for location 0x%08x", locationID);
-
-    if (!dev) {
-      ret = LIBUSB_ERROR_NO_MEM;
-      break;
-    }
-
-    priv = (struct darwin_device_priv *)dev->os_priv;
-
-    /* Set up request for device descriptor */
-    req.bmRequestType = USBmakebmRequestType(kUSBIn, kUSBStandard, kUSBDevice);
-    req.bRequest      = kUSBRqGetDescriptor;
-    req.wValue        = kUSBDeviceDesc << 8;
-    req.wIndex        = 0;
-    req.wLength       = sizeof(IOUSBDeviceDescriptor);
-    req.pData         = &(priv->dev_descriptor);
-
-    (*(device))->GetDeviceAddress (device, (USBDeviceAddress *)&address);
-    (*(device))->GetDeviceProduct (device, &idProduct);
-    (*(device))->GetDeviceVendor (device, &idVendor);
-    (*(device))->GetDeviceClass (device, &bDeviceClass);
-    (*(device))->GetDeviceSubClass (device, &bDeviceSubClass);
-
-    /**** retrieve device descriptors ****/
-    /* according to Apple's documentation the device must be open for DeviceRequest but we may not be able to open some
-     * devices and Apple's USB Prober doesn't bother to open the device before issuing a descriptor request */
-    ret = (*(device))->DeviceRequest (device, &req);
-    if (ret != kIOReturnSuccess) {
-      int try_unsuspend = 1;
-#if DeviceVersion >= 320
-      UInt32 info;
-
-      /* device may be suspended. unsuspend it and try again */
-      /* IOUSBFamily 320+ provides a way to detect device suspension but earlier versions do not */
-      (void)(*device)->GetUSBDeviceInformation (device, &info);
-
-      try_unsuspend = info & (1 << kUSBInformationDeviceIsSuspendedBit);
-#endif
-
-      /* the device should be open before to device is unsuspended */
-      (void) (*device)->USBDeviceOpenSeize(device);
-
-      if (try_unsuspend) {
-	/* resume the device */
-	(void)(*device)->USBDeviceSuspend (device, 0);
-
-	ret = (*(device))->DeviceRequest (device, &req);
-
-	/* resuspend the device */
-	(void)(*device)->USBDeviceSuspend (device, 1);
-      }
-
-      (*device)->USBDeviceClose (device);
-    }
-
-    if (ret != kIOReturnSuccess) {
-      usbi_warn (ctx, "could not retrieve device descriptor: %s. skipping device", darwin_error_str (ret));
-      ret = -1;
-      break;
-    }
-
-    /**** end: retrieve device descriptors ****/
-
-    /* catch buggy hubs (which appear to be virtual). Apple's own USB prober has problems with these devices. */
-    if (libusb_le16_to_cpu (priv->dev_descriptor.idProduct) != idProduct) {
-      /* not a valid device */
-      usbi_warn (ctx, "idProduct from iokit (%04x) does not match idProduct in descriptor (%04x). skipping device",
-		 idProduct, libusb_le16_to_cpu (priv->dev_descriptor.idProduct));
-      ret = -1;
-      break;
-    }
-
-    dev->bus_number     = locationID >> 24;
-    dev->device_address = address;
-
-    /* check current active configuration (and cache the first configuration value-- which may be used by claim_interface) */
-    ret = darwin_check_configuration (ctx, dev, device);
-    if (ret < 0)
-      break;
-
-    /* save our location, we'll need this later */
-    priv->location = locationID;
-    snprintf(priv->sys_path, 20, "%03i-%04x-%04x-%02x-%02x", address, idVendor, idProduct, bDeviceClass, bDeviceSubClass);
-
-    ret = usbi_sanitize_device (dev);
-    if (ret < 0)
-      break;
-
-    /* append the device to the list of discovered devices */
-    discdevs = discovered_devs_append(*_discdevs, dev);
-    if (!discdevs) {
-      ret = LIBUSB_ERROR_NO_MEM;
-      break;
-    }
-
-    *_discdevs = discdevs;
-
-    usbi_info (ctx, "found device with address %d at %s", dev->device_address, priv->sys_path);
-  } while (0);
-
-  if (need_unref)
-    libusb_unref_device(dev);
-
-  return ret;
-}
-
-static int darwin_get_device_list(struct libusb_context *ctx, struct discovered_devs **_discdevs) {
-  io_iterator_t        deviceIterator;
-  usb_device_t         **device;
-  kern_return_t        kresult;
-  UInt32               location;
-
-  if (!libusb_darwin_mp)
-    return LIBUSB_ERROR_INVALID_PARAM;
-
-  kresult = usb_setup_device_iterator (&deviceIterator);
-  if (kresult != kIOReturnSuccess)
-    return darwin_to_libusb (kresult);
-
-  while ((device = usb_get_next_device (deviceIterator, &location)) != NULL) {
-    (void) process_new_device (ctx, device, location, _discdevs);
-
-    (*(device))->Release(device);
-  }
-
-  IOObjectRelease(deviceIterator);
-
-  return 0;
-}
-
-static int darwin_open (struct libusb_device_handle *dev_handle) {
-  struct darwin_device_handle_priv *priv = (struct darwin_device_handle_priv *)dev_handle->os_priv;
-  struct darwin_device_priv *dpriv = (struct darwin_device_priv *)dev_handle->dev->os_priv;
-  usb_device_t  **darwin_device;
-  IOReturn kresult;
-
-  if (0 == dpriv->open_count) {
-    kresult = darwin_get_device (dpriv->location, &darwin_device);
-    if (kresult) {
-      usbi_err (HANDLE_CTX (dev_handle), "could not find device: %s", darwin_error_str (kresult));
-      return darwin_to_libusb (kresult);
-    }
-
-    dpriv->device = darwin_device;
-
-    /* try to open the device */
-    kresult = (*(dpriv->device))->USBDeviceOpenSeize (dpriv->device);
-
-    if (kresult != kIOReturnSuccess) {
-      usbi_err (HANDLE_CTX (dev_handle), "USBDeviceOpen: %s", darwin_error_str(kresult));
-
-      switch (kresult) {
-      case kIOReturnExclusiveAccess:
-	/* it is possible to perform some actions on a device that is not open so do not return an error */
-	priv->is_open = 0;
-
-	break;
-      default:
-	(*(dpriv->device))->Release (dpriv->device);
-	dpriv->device = NULL;
-	return darwin_to_libusb (kresult);
-      }
-    } else {
-      priv->is_open = 1;
-
-      /* create async event source */
-      kresult = (*(dpriv->device))->CreateDeviceAsyncEventSource (dpriv->device, &priv->cfSource);
-
-      CFRetain (libusb_darwin_acfl);
-
-      /* add the cfSource to the aync run loop */
-      CFRunLoopAddSource(libusb_darwin_acfl, priv->cfSource, kCFRunLoopCommonModes);
-    }
-  }
-
-  /* device opened successfully */
-  dpriv->open_count++;
-
-  /* create a file descriptor for notifications */
-  pipe (priv->fds);
-
-  /* set the pipe to be non-blocking */
-  fcntl (priv->fds[1], F_SETFD, O_NONBLOCK);
-
-  usbi_add_pollfd(HANDLE_CTX(dev_handle), priv->fds[0], POLLIN);
-
-  usbi_info (HANDLE_CTX (dev_handle), "device open for access");
-
-  return 0;
-}
-
-static void darwin_close (struct libusb_device_handle *dev_handle) {
-  struct darwin_device_handle_priv *priv = (struct darwin_device_handle_priv *)dev_handle->os_priv;
-  struct darwin_device_priv *dpriv = (struct darwin_device_priv *)dev_handle->dev->os_priv;
-  IOReturn kresult;
-  int i;
-
-  if (dpriv->open_count == 0) {
-    /* something is probably very wrong if this is the case */
-    usbi_err (HANDLE_CTX (dev_handle), "Close called on a device that was not open!\n");
-    return;
-  }
-
-  dpriv->open_count--;
-
-  /* make sure all interfaces are released */
-  for (i = 0 ; i < USB_MAXINTERFACES ; i++)
-    if (dev_handle->claimed_interfaces & (1 << i))
-      libusb_release_interface (dev_handle, i);
-
-  if (0 == dpriv->open_count) {
-    if (priv->is_open) {
-      /* delete the device's async event source */
-      if (priv->cfSource) {
-	CFRunLoopRemoveSource (libusb_darwin_acfl, priv->cfSource, kCFRunLoopDefaultMode);
-	CFRelease (priv->cfSource);
-      }
-
-      /* close the device */
-      kresult = (*(dpriv->device))->USBDeviceClose(dpriv->device);
-      if (kresult) {
-	/* Log the fact that we had a problem closing the file, however failing a
-	 * close isn't really an error, so return success anyway */
-	usbi_err (HANDLE_CTX (dev_handle), "USBDeviceClose: %s", darwin_error_str(kresult));
-      }
-    }
-
-    kresult = (*(dpriv->device))->Release(dpriv->device);
-    if (kresult) {
-      /* Log the fact that we had a problem closing the file, however failing a
-       * close isn't really an error, so return success anyway */
-      usbi_err (HANDLE_CTX (dev_handle), "Release: %s", darwin_error_str(kresult));
-    }
-
-    dpriv->device = NULL;
-  }
-
-  /* file descriptors are maintained per-instance */
-  usbi_remove_pollfd (HANDLE_CTX (dev_handle), priv->fds[0]);
-  close (priv->fds[1]);
-  close (priv->fds[0]);
-
-  priv->fds[0] = priv->fds[1] = -1;
-}
-
-static int darwin_get_configuration(struct libusb_device_handle *dev_handle, int *config) {
-  struct darwin_device_priv *dpriv = (struct darwin_device_priv *)dev_handle->dev->os_priv;
-
-  *config = (int) dpriv->active_config;
-
-  return 0;
-}
-
-static int darwin_set_configuration(struct libusb_device_handle *dev_handle, int config) {
-  struct darwin_device_priv *dpriv = (struct darwin_device_priv *)dev_handle->dev->os_priv;
-  IOReturn kresult;
-  int i;
-
-  /* Setting configuration will invalidate the interface, so we need
-     to reclaim it. First, dispose of existing interfaces, if any. */
-  for (i = 0 ; i < USB_MAXINTERFACES ; i++)
-    if (dev_handle->claimed_interfaces & (1 << i))
-      darwin_release_interface (dev_handle, i);
-
-  kresult = (*(dpriv->device))->SetConfiguration (dpriv->device, config);
-  if (kresult != kIOReturnSuccess)
-    return darwin_to_libusb (kresult);
-
-  /* Reclaim any interfaces. */
-  for (i = 0 ; i < USB_MAXINTERFACES ; i++)
-    if (dev_handle->claimed_interfaces & (1 << i))
-      darwin_claim_interface (dev_handle, i);
-
-  dpriv->active_config = config;
-
-  return 0;
-}
-
-static int darwin_get_interface (usb_device_t **darwin_device, uint8_t ifc, io_service_t *usbInterfacep) {
-  IOUSBFindInterfaceRequest request;
-  uint8_t                   current_interface;
-  kern_return_t             kresult;
-  io_iterator_t             interface_iterator;
-
-  *usbInterfacep = IO_OBJECT_NULL;
-
-  /* Setup the Interface Request */
-  request.bInterfaceClass    = kIOUSBFindInterfaceDontCare;
-  request.bInterfaceSubClass = kIOUSBFindInterfaceDontCare;
-  request.bInterfaceProtocol = kIOUSBFindInterfaceDontCare;
-  request.bAlternateSetting  = kIOUSBFindInterfaceDontCare;
-
-  kresult = (*(darwin_device))->CreateInterfaceIterator(darwin_device, &request, &interface_iterator);
-  if (kresult)
-    return kresult;
-
-  for ( current_interface = 0 ; current_interface <= ifc ; current_interface++ ) {
-    *usbInterfacep = IOIteratorNext(interface_iterator);
-    if (current_interface != ifc)
-      (void) IOObjectRelease (*usbInterfacep);
-  }
-
-  /* done with the interface iterator */
-  IOObjectRelease(interface_iterator);
-
-  return 0;
-}
-
-static int get_endpoints (struct libusb_device_handle *dev_handle, int iface) {
-  struct darwin_device_handle_priv *priv = (struct darwin_device_handle_priv *)dev_handle->os_priv;
-
-  /* current interface */
-  struct __darwin_interface *cInterface = &priv->interfaces[iface];
-
-  kern_return_t kresult;
-
-  u_int8_t numep, direction, number;
-  u_int8_t dont_care1, dont_care3;
-  u_int16_t dont_care2;
-  int i;
-
-  usbi_info (HANDLE_CTX (dev_handle), "building table of endpoints.");
-
-  /* retrieve the total number of endpoints on this interface */
-  kresult = (*(cInterface->interface))->GetNumEndpoints(cInterface->interface, &numep);
-  if (kresult) {
-    usbi_err (HANDLE_CTX (dev_handle), "can't get number of endpoints for interface: %s", darwin_error_str(kresult));
-    return darwin_to_libusb (kresult);
-  }
-
-  /* iterate through pipe references */
-  for (i = 1 ; i <= numep ; i++) {
-    kresult = (*(cInterface->interface))->GetPipeProperties(cInterface->interface, i, &direction, &number, &dont_care1,
-							    &dont_care2, &dont_care3);
-
-    if (kresult != kIOReturnSuccess) {
-      usbi_err (HANDLE_CTX (dev_handle), "error getting pipe information for pipe %d: %s", i, darwin_error_str(kresult));
-
-      return darwin_to_libusb (kresult);
-    }
-
-    usbi_info (HANDLE_CTX (dev_handle), "interface: %i pipe %i: dir: %i number: %i", iface, i, direction, number);
-
-    cInterface->endpoint_addrs[i - 1] = ((direction << 7 & LIBUSB_ENDPOINT_DIR_MASK) | (number & LIBUSB_ENDPOINT_ADDRESS_MASK));
-  }
-
-  cInterface->num_endpoints = numep;
-
-  return 0;
-}
-
-static int darwin_claim_interface(struct libusb_device_handle *dev_handle, int iface) {
-  struct darwin_device_priv *dpriv = (struct darwin_device_priv *)dev_handle->dev->os_priv;
-  struct darwin_device_handle_priv *priv = (struct darwin_device_handle_priv *)dev_handle->os_priv;
-  io_service_t          usbInterface = IO_OBJECT_NULL;
-  IOReturn kresult;
-  IOCFPlugInInterface **plugInInterface = NULL;
-  SInt32                score;
-
-  /* current interface */
-  struct __darwin_interface *cInterface = &priv->interfaces[iface];
-
-  kresult = darwin_get_interface (dpriv->device, iface, &usbInterface);
-  if (kresult != kIOReturnSuccess)
-    return darwin_to_libusb (kresult);
-
-  /* make sure we have an interface */
-  if (!usbInterface && dpriv->first_config != 0) {
-    usbi_info (HANDLE_CTX (dev_handle), "no interface found; setting configuration: %d", dpriv->first_config);
-
-    /* set the configuration */
-    kresult = darwin_set_configuration (dev_handle, dpriv->first_config);
-    if (kresult != LIBUSB_SUCCESS) {
-      usbi_err (HANDLE_CTX (dev_handle), "could not set configuration");
-      return kresult;
-    }
-
-    kresult = darwin_get_interface (dpriv->device, iface, &usbInterface);
-    if (kresult) {
-      usbi_err (HANDLE_CTX (dev_handle), "darwin_get_interface: %s", darwin_error_str(kresult));
-      return darwin_to_libusb (kresult);
-    }
-  }
-
-  if (!usbInterface) {
-    usbi_err (HANDLE_CTX (dev_handle), "interface not found");
-    return LIBUSB_ERROR_NOT_FOUND;
-  }
-
-  /* get an interface to the device's interface */
-  kresult = IOCreatePlugInInterfaceForService (usbInterface, kIOUSBInterfaceUserClientTypeID,
-					       kIOCFPlugInInterfaceID, &plugInInterface, &score);
-  if (kresult) {
-    usbi_err (HANDLE_CTX (dev_handle), "IOCreatePlugInInterfaceForService: %s", darwin_error_str(kresult));
-    return darwin_to_libusb (kresult);
-  }
-
-  if (!plugInInterface) {
-    usbi_err (HANDLE_CTX (dev_handle), "plugin interface not found");
-    return LIBUSB_ERROR_NOT_FOUND;
-  }
-
-  /* ignore release error */
-  (void)IOObjectRelease (usbInterface);
-
-  /* Do the actual claim */
-  kresult = (*plugInInterface)->QueryInterface(plugInInterface,
-					       CFUUIDGetUUIDBytes(kIOUSBInterfaceInterfaceID),
-					       (LPVOID)&cInterface->interface);
-  if (kresult || !cInterface->interface) {
-    usbi_err (HANDLE_CTX (dev_handle), "QueryInterface: %s", darwin_error_str(kresult));
-    return darwin_to_libusb (kresult);
-  }
-
-  /* We no longer need the intermediate plug-in */
-  (*plugInInterface)->Release(plugInInterface);
-
-  /* claim the interface */
-  kresult = (*(cInterface->interface))->USBInterfaceOpen(cInterface->interface);
-  if (kresult) {
-    usbi_err (HANDLE_CTX (dev_handle), "USBInterfaceOpen: %s", darwin_error_str(kresult));
-    return darwin_to_libusb (kresult);
-  }
-
-  /* update list of endpoints */
-  kresult = get_endpoints (dev_handle, iface);
-  if (kresult) {
-    /* this should not happen */
-    darwin_release_interface (dev_handle, iface);
-    usbi_err (HANDLE_CTX (dev_handle), "could not build endpoint table");
-    return kresult;
-  }
-
-  cInterface->cfSource = NULL;
-
-  /* create async event source */
-  kresult = (*(cInterface->interface))->CreateInterfaceAsyncEventSource (cInterface->interface, &cInterface->cfSource);
-  if (kresult != kIOReturnSuccess) {
-    usbi_err (HANDLE_CTX (dev_handle), "could not create async event source");
-
-    /* can't continue without an async event source */
-    (void)darwin_release_interface (dev_handle, iface);
-
-    return darwin_to_libusb (kresult);
-  }
-
-  /* add the cfSource to the async thread's run loop */
-  CFRunLoopAddSource(libusb_darwin_acfl, cInterface->cfSource, kCFRunLoopDefaultMode);
-
-  usbi_info (HANDLE_CTX (dev_handle), "interface opened");
-
-  return 0;
-}
-
-static int darwin_release_interface(struct libusb_device_handle *dev_handle, int iface) {
-  struct darwin_device_handle_priv *priv = (struct darwin_device_handle_priv *)dev_handle->os_priv;
-  IOReturn kresult;
-
-  /* current interface */
-  struct __darwin_interface *cInterface = &priv->interfaces[iface];
-
-  /* Check to see if an interface is open */
-  if (!cInterface->interface)
-    return LIBUSB_SUCCESS;
-
-  /* clean up endpoint data */
-  cInterface->num_endpoints = 0;
-
-  /* delete the interface's async event source */
-  if (cInterface->cfSource) {
-    CFRunLoopRemoveSource (libusb_darwin_acfl, cInterface->cfSource, kCFRunLoopDefaultMode);
-    CFRelease (cInterface->cfSource);
-  }
-
-  kresult = (*(cInterface->interface))->USBInterfaceClose(cInterface->interface);
-  if (kresult)
-    usbi_err (HANDLE_CTX (dev_handle), "USBInterfaceClose: %s", darwin_error_str(kresult));
-
-  kresult = (*(cInterface->interface))->Release(cInterface->interface);
-  if (kresult != kIOReturnSuccess)
-    usbi_err (HANDLE_CTX (dev_handle), "Release: %s", darwin_error_str(kresult));
-
-  cInterface->interface = IO_OBJECT_NULL;
-
-  return darwin_to_libusb (kresult);
-}
-
-static int darwin_set_interface_altsetting(struct libusb_device_handle *dev_handle, int iface, int altsetting) {
-  struct darwin_device_handle_priv *priv = (struct darwin_device_handle_priv *)dev_handle->os_priv;
-  IOReturn kresult;
-
-  /* current interface */
-  struct __darwin_interface *cInterface = &priv->interfaces[iface];
-
-  if (!cInterface->interface)
-    return LIBUSB_ERROR_NO_DEVICE;
-
-  kresult = (*(cInterface->interface))->SetAlternateInterface (cInterface->interface, altsetting);
-  if (kresult != kIOReturnSuccess)
-    darwin_reset_device (dev_handle);
-
-  /* update list of endpoints */
-  kresult = get_endpoints (dev_handle, iface);
-  if (kresult) {
-    /* this should not happen */
-    darwin_release_interface (dev_handle, iface);
-    usbi_err (HANDLE_CTX (dev_handle), "could not build endpoint table");
-    return kresult;
-  }
-
-  return darwin_to_libusb (kresult);
-}
-
-static int darwin_clear_halt(struct libusb_device_handle *dev_handle, unsigned char endpoint) {
-  struct darwin_device_handle_priv *priv = (struct darwin_device_handle_priv *)dev_handle->os_priv;
-
-  /* current interface */
-  struct __darwin_interface *cInterface;
-  uint8_t pipeRef, iface;
-  IOReturn kresult;
-
-  /* determine the interface/endpoint to use */
-  if (ep_to_pipeRef (dev_handle, endpoint, &pipeRef, &iface) != 0) {
-    usbi_err (HANDLE_CTX (dev_handle), "endpoint not found on any open interface");
-
-    return LIBUSB_ERROR_NOT_FOUND;
-  }
-
-  cInterface = &priv->interfaces[iface];
-
-#if (InterfaceVersion < 190)
-  kresult = (*(cInterface->interface))->ClearPipeStall(cInterface->interface, pipeRef);
-#else
-  /* newer versions of darwin support clearing additional bits on the device's endpoint */
-  kresult = (*(cInterface->interface))->ClearPipeStallBothEnds(cInterface->interface, pipeRef);
-#endif
-  if (kresult)
-    usbi_err (HANDLE_CTX (dev_handle), "ClearPipeStall: %s", darwin_error_str (kresult));
-
-  return darwin_to_libusb (kresult);
-}
-
-static int darwin_reset_device(struct libusb_device_handle *dev_handle) {
-  struct darwin_device_priv *dpriv = (struct darwin_device_priv *)dev_handle->dev->os_priv;
-  IOReturn kresult;
-
-  kresult = (*(dpriv->device))->ResetDevice (dpriv->device);
-  if (kresult)
-    usbi_err (HANDLE_CTX (dev_handle), "ResetDevice: %s", darwin_error_str (kresult));
-
-  return darwin_to_libusb (kresult);
-}
-
-static int darwin_kernel_driver_active(struct libusb_device_handle *dev_handle, int interface) {
-  struct darwin_device_priv *dpriv = (struct darwin_device_priv *)dev_handle->dev->os_priv;
-  io_service_t usbInterface;
-  CFTypeRef driver;
-  IOReturn kresult;
-
-  kresult = darwin_get_interface (dpriv->device, interface, &usbInterface);
-  if (kresult) {
-    usbi_err (HANDLE_CTX (dev_handle), "darwin_get_interface: %s", darwin_error_str(kresult));
-
-    return darwin_to_libusb (kresult);
-  }
-
-  driver = IORegistryEntryCreateCFProperty (usbInterface, kIOBundleIdentifierKey, kCFAllocatorDefault, 0);
-  IOObjectRelease (usbInterface);
-
-  if (driver) {
-    CFRelease (driver);
-
-    return 1;
-  }
-
-  /* no driver */
-  return 0;
-}
-
-/* attaching/detaching kernel drivers is not currently supported (maybe in the future?) */
-static int darwin_attach_kernel_driver (struct libusb_device_handle *dev_handle, int interface) {
-  return LIBUSB_ERROR_NOT_SUPPORTED;
-}
-
-static int darwin_detach_kernel_driver (struct libusb_device_handle *dev_handle, int interface) {
-  return LIBUSB_ERROR_NOT_SUPPORTED;
-}
-
-static void darwin_destroy_device(struct libusb_device *dev) {
-}
-
-static int submit_bulk_transfer(struct usbi_transfer *itransfer) {
-  struct libusb_transfer *transfer = __USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
-  struct darwin_device_handle_priv *priv = (struct darwin_device_handle_priv *)transfer->dev_handle->os_priv;
-
-  IOReturn               ret;
-  uint8_t                is_read; /* 0 = we're reading, 1 = we're writing */
-  uint8_t                transferType;
-  /* None of the values below are used in libusb for bulk transfers */
-  uint8_t                direction, number, interval, pipeRef, iface;
-  uint16_t               maxPacketSize;
-
-  struct __darwin_interface *cInterface;
-
-  /* are we reading or writing? */
-  is_read = transfer->endpoint & LIBUSB_ENDPOINT_IN;
-
-  if (ep_to_pipeRef (transfer->dev_handle, transfer->endpoint, &pipeRef, &iface) != 0) {
-    usbi_err (TRANSFER_CTX (transfer), "endpoint not found on any open interface");
-
-    return LIBUSB_ERROR_NOT_FOUND;
-  }
-
-  cInterface = &priv->interfaces[iface];
-
-  (*(cInterface->interface))->GetPipeProperties (cInterface->interface, pipeRef, &direction, &number,
-						 &transferType, &maxPacketSize, &interval);
-
-  /* submit the request */
-  /* timeouts are unavailable on interrupt endpoints */
-  if (transferType == kUSBInterrupt) {
-    if (is_read)
-      ret = (*(cInterface->interface))->ReadPipeAsync(cInterface->interface, pipeRef, transfer->buffer,
-						      transfer->length, darwin_async_io_callback, itransfer);
-    else
-      ret = (*(cInterface->interface))->WritePipeAsync(cInterface->interface, pipeRef, transfer->buffer,
-						       transfer->length, darwin_async_io_callback, itransfer);
-  } else {
-    if (is_read)
-      ret = (*(cInterface->interface))->ReadPipeAsyncTO(cInterface->interface, pipeRef, transfer->buffer,
-							transfer->length, transfer->timeout, transfer->timeout,
-							darwin_async_io_callback, (void *)itransfer);
-    else
-      ret = (*(cInterface->interface))->WritePipeAsyncTO(cInterface->interface, pipeRef, transfer->buffer,
-							 transfer->length, transfer->timeout, transfer->timeout,
-							 darwin_async_io_callback, (void *)itransfer);
-  }
-
-  if (ret)
-    usbi_err (TRANSFER_CTX (transfer), "bulk transfer failed (dir = %s): %s (code = 0x%08x)", is_read ? "In" : "Out",
-	       darwin_error_str(ret), ret);
-
-  return darwin_to_libusb (ret);
-}
-
-static int submit_iso_transfer(struct usbi_transfer *itransfer) {
-  struct libusb_transfer *transfer = __USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
-  struct darwin_transfer_priv *tpriv = usbi_transfer_get_os_priv(itransfer);
-  struct darwin_device_handle_priv *priv = (struct darwin_device_handle_priv *)transfer->dev_handle->os_priv;
-
-  IOReturn                kresult;
-  uint8_t                 is_read; /* 0 = we're writing, 1 = we're reading */
-  uint8_t                 pipeRef, iface;
-  UInt64                  frame;
-  AbsoluteTime            atTime;
-  int                     i;
-
-  struct __darwin_interface *cInterface;
-
-  /* are we reading or writing? */
-  is_read = transfer->endpoint & LIBUSB_ENDPOINT_IN;
-
-  /* construct an array of IOUSBIsocFrames */
-  tpriv->isoc_framelist = (IOUSBIsocFrame*) calloc (transfer->num_iso_packets, sizeof(IOUSBIsocFrame));
-  if (!tpriv->isoc_framelist)
-    return LIBUSB_ERROR_NO_MEM;
-
-  /* copy the frame list from the libusb descriptor (the structures differ only is member order) */
-  for (i = 0 ; i < transfer->num_iso_packets ; i++)
-    tpriv->isoc_framelist[i].frReqCount = transfer->iso_packet_desc[i].length;
-
-  /* determine the interface/endpoint to use */
-  if (ep_to_pipeRef (transfer->dev_handle, transfer->endpoint, &pipeRef, &iface) != 0) {
-    usbi_err (TRANSFER_CTX (transfer), "endpoint not found on any open interface");
-
-    return LIBUSB_ERROR_NOT_FOUND;
-  }
-
-  cInterface = &priv->interfaces[iface];
-
-  /* Last but not least we need the bus frame number */
-  kresult = (*(cInterface->interface))->GetBusFrameNumber(cInterface->interface, &frame, &atTime);
-  if (kresult) {
-    usbi_err (TRANSFER_CTX (transfer), "failed to get bus frame number: %d", kresult);
-    free(tpriv->isoc_framelist);
-    tpriv->isoc_framelist = NULL;
-
-    return darwin_to_libusb (kresult);
-  }
-
-  /* schedule for a frame a little in the future */
-  frame += 2;
-
-  /* submit the request */
-  if (is_read)
-    kresult = (*(cInterface->interface))->ReadIsochPipeAsync(cInterface->interface, pipeRef, transfer->buffer, frame,
-							     transfer->num_iso_packets, tpriv->isoc_framelist, darwin_async_io_callback,
-							     itransfer);
-  else
-    kresult = (*(cInterface->interface))->WriteIsochPipeAsync(cInterface->interface, pipeRef, transfer->buffer, frame,
-							      transfer->num_iso_packets, tpriv->isoc_framelist, darwin_async_io_callback,
-							      itransfer);
-
-  if (kresult != kIOReturnSuccess) {
-    usbi_err (TRANSFER_CTX (transfer), "isochronous transfer failed (dir: %s): %s", is_read ? "In" : "Out",
-	       darwin_error_str(kresult));
-    free (tpriv->isoc_framelist);
-    tpriv->isoc_framelist = NULL;
-  }
-
-  return darwin_to_libusb (kresult);
-}
-
-static int submit_control_transfer(struct usbi_transfer *itransfer) {
-  struct libusb_transfer *transfer = __USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
-  struct libusb_control_setup *setup = (struct libusb_control_setup *) transfer->buffer;
-  struct darwin_device_priv *dpriv = (struct darwin_device_priv *)transfer->dev_handle->dev->os_priv;
-  struct darwin_transfer_priv *tpriv = usbi_transfer_get_os_priv(itransfer);
-
-  IOReturn               kresult;
-
-  bzero(&tpriv->req, sizeof(tpriv->req));
-
-  /* IOUSBDeviceInterface expects the request in cpu endianess */
-  tpriv->req.bmRequestType     = setup->bmRequestType;
-  tpriv->req.bRequest          = setup->bRequest;
-  /* these values should be in bus order from libusb_fill_control_setup */
-  tpriv->req.wValue            = OSSwapLittleToHostInt16 (setup->wValue);
-  tpriv->req.wIndex            = OSSwapLittleToHostInt16 (setup->wIndex);
-  tpriv->req.wLength           = OSSwapLittleToHostInt16 (setup->wLength);
-  /* data is stored after the libusb control block */
-  tpriv->req.pData             = transfer->buffer + LIBUSB_CONTROL_SETUP_SIZE;
-  tpriv->req.completionTimeout = transfer->timeout;
-  tpriv->req.noDataTimeout     = transfer->timeout;
-
-  /* all transfers in libusb-1.0 are async */
-  kresult = (*(dpriv->device))->DeviceRequestAsyncTO(dpriv->device, &(tpriv->req), darwin_async_io_callback, itransfer);
-
-  if (kresult != kIOReturnSuccess)
-    usbi_err (TRANSFER_CTX (transfer), "control request failed: %s", darwin_error_str(kresult));
-
-  return darwin_to_libusb (kresult);
-}
-
-static int darwin_submit_transfer(struct usbi_transfer *itransfer) {
-  struct libusb_transfer *transfer = __USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
-
-  switch (transfer->type) {
-  case LIBUSB_TRANSFER_TYPE_CONTROL:
-    return submit_control_transfer(itransfer);
-  case LIBUSB_TRANSFER_TYPE_BULK:
-  case LIBUSB_TRANSFER_TYPE_INTERRUPT:
-    return submit_bulk_transfer(itransfer);
-  case LIBUSB_TRANSFER_TYPE_ISOCHRONOUS:
-    return submit_iso_transfer(itransfer);
-  default:
-    usbi_err (TRANSFER_CTX(transfer), "unknown endpoint type %d", transfer->type);
-    return LIBUSB_ERROR_INVALID_PARAM;
-  }
-}
-
-static int cancel_control_transfer(struct usbi_transfer *itransfer) {
-  struct libusb_transfer *transfer = __USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
-  struct darwin_device_priv *dpriv = (struct darwin_device_priv *)transfer->dev_handle->dev->os_priv;
-  IOReturn kresult;
-
-  usbi_info (ITRANSFER_CTX (itransfer), "WARNING: aborting all transactions control pipe");
-
-  kresult = (*(dpriv->device))->USBDeviceAbortPipeZero (dpriv->device);
-
-  return darwin_to_libusb (kresult);
-}
-
-static int darwin_abort_transfers (struct usbi_transfer *itransfer) {
-  struct libusb_transfer *transfer = __USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
-  struct darwin_device_handle_priv *priv = (struct darwin_device_handle_priv *)transfer->dev_handle->os_priv;
-  struct __darwin_interface *cInterface;
-  uint8_t pipeRef, iface;
-  IOReturn kresult;
-
-  if (ep_to_pipeRef (transfer->dev_handle, transfer->endpoint, &pipeRef, &iface) != 0) {
-    usbi_err (TRANSFER_CTX (transfer), "endpoint not found on any open interface");
-
-    return LIBUSB_ERROR_NOT_FOUND;
-  }
-
-  cInterface = &priv->interfaces[iface];
-
-  usbi_info (ITRANSFER_CTX (itransfer), "WARNING: aborting all transactions on interface %d pipe %d", iface, pipeRef);
-
-  /* abort transactions */
-  (*(cInterface->interface))->AbortPipe (cInterface->interface, pipeRef);
-
-  usbi_info (ITRANSFER_CTX (itransfer), "calling clear pipe stall to clear the data toggle bit");
-
-  /* clear the data toggle bit */
-#if (InterfaceVersion < 190)
-  kresult = (*(cInterface->interface))->ClearPipeStall(cInterface->interface, pipeRef);
-#else
-  /* newer versions of darwin support clearing additional bits on the device's endpoint */
-  kresult = (*(cInterface->interface))->ClearPipeStallBothEnds(cInterface->interface, pipeRef);
-#endif
-
-  return darwin_to_libusb (kresult);
-}
-
-static int darwin_cancel_transfer(struct usbi_transfer *itransfer) {
-  struct libusb_transfer *transfer = __USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
-
-  switch (transfer->type) {
-  case LIBUSB_TRANSFER_TYPE_CONTROL:
-    return cancel_control_transfer(itransfer);
-  case LIBUSB_TRANSFER_TYPE_BULK:
-  case LIBUSB_TRANSFER_TYPE_INTERRUPT:
-  case LIBUSB_TRANSFER_TYPE_ISOCHRONOUS:
-    return darwin_abort_transfers (itransfer);
-  default:
-    usbi_err (TRANSFER_CTX(transfer), "unknown endpoint type %d", transfer->type);
-    return LIBUSB_ERROR_INVALID_PARAM;
-  }
-}
-
-static void darwin_clear_transfer_priv (struct usbi_transfer *itransfer) {
-  struct libusb_transfer *transfer = __USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
-  struct darwin_transfer_priv *tpriv = usbi_transfer_get_os_priv(itransfer);
-
-  if (transfer->type == LIBUSB_TRANSFER_TYPE_ISOCHRONOUS && tpriv->isoc_framelist) {
-    free (tpriv->isoc_framelist);
-    tpriv->isoc_framelist = NULL;
-  }
-}
-
-static void darwin_async_io_callback (void *refcon, IOReturn result, void *arg0) {
-  struct usbi_transfer *itransfer = (struct usbi_transfer *)refcon;
-  struct libusb_transfer *transfer = __USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
-  struct darwin_device_handle_priv *priv = (struct darwin_device_handle_priv *)transfer->dev_handle->os_priv;
-  UInt32 message;
-
-  usbi_info (ITRANSFER_CTX (itransfer), "an async io operation has completed");
-
-  /* send a completion message to the device's file descriptor */
-  message = MESSAGE_ASYNC_IO_COMPLETE;
-  write (priv->fds[1], &message, sizeof (message));
-  write (priv->fds[1], &itransfer, sizeof (itransfer));
-  write (priv->fds[1], &result, sizeof (IOReturn));
-  write (priv->fds[1], &arg0, sizeof (UInt32));
-}
-
-static int darwin_transfer_status (struct usbi_transfer *itransfer, kern_return_t result) {
-  switch (result) {
-  case kIOReturnUnderrun:
-  case kIOReturnSuccess:
-    return LIBUSB_TRANSFER_COMPLETED;
-  case kIOReturnAborted:
-    return LIBUSB_TRANSFER_CANCELLED;
-  case kIOUSBPipeStalled:
-    usbi_warn (ITRANSFER_CTX (itransfer), "transfer error: pipe is stalled");
-    return LIBUSB_TRANSFER_STALL;
-  case kIOReturnOverrun:
-    usbi_err (ITRANSFER_CTX (itransfer), "transfer error: data overrun");
-    return LIBUSB_TRANSFER_OVERFLOW;
-  case kIOUSBTransactionTimeout:
-    usbi_err (ITRANSFER_CTX (itransfer), "transfer error: timed out");
-    return LIBUSB_TRANSFER_TIMED_OUT;
-  default:
-    usbi_err (ITRANSFER_CTX (itransfer), "transfer error: %s (value = 0x%08x)", darwin_error_str (result), result);
-    return LIBUSB_TRANSFER_ERROR;
-  }
-}
-
-static void darwin_handle_callback (struct usbi_transfer *itransfer, kern_return_t result, UInt32 io_size) {
-  struct libusb_transfer *transfer = __USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
-  struct darwin_transfer_priv *tpriv = usbi_transfer_get_os_priv(itransfer);
-  int isIsoc      = LIBUSB_TRANSFER_TYPE_ISOCHRONOUS == transfer->type;
-  int isBulk      = LIBUSB_TRANSFER_TYPE_BULK == transfer->type;
-  int isControl   = LIBUSB_TRANSFER_TYPE_CONTROL == transfer->type;
-  int isInterrupt = LIBUSB_TRANSFER_TYPE_INTERRUPT == transfer->type;
-  int i;
-
-  if (!isIsoc && !isBulk && !isControl && !isInterrupt) {
-    usbi_err (TRANSFER_CTX(transfer), "unknown endpoint type %d", transfer->type);
-    return;
-  }
-
-  usbi_info (ITRANSFER_CTX (itransfer), "handling %s completion with kernel status %d",
-	     isControl ? "control" : isBulk ? "bulk" : isIsoc ? "isoc" : "interrupt", result);
-
-  if (kIOReturnSuccess == result || kIOReturnUnderrun == result) {
-    if (isIsoc && tpriv->isoc_framelist) {
-      /* copy isochronous results back */
-
-      for (i = 0; i < transfer->num_iso_packets ; i++) {
-	struct libusb_iso_packet_descriptor *lib_desc = &transfer->iso_packet_desc[i];
-	lib_desc->status = darwin_to_libusb (tpriv->isoc_framelist[i].frStatus);
-	lib_desc->actual_length = tpriv->isoc_framelist[i].frActCount;
-      }
-    } else if (!isIsoc)
-      itransfer->transferred += io_size;
-  }
-
-  /* it is ok to handle cancelled transfers without calling usbi_handle_transfer_cancellation (we catch timeout transfers) */
-  usbi_handle_transfer_completion (itransfer, darwin_transfer_status (itransfer, result));
-}
-
-static int op_handle_events(struct libusb_context *ctx, struct pollfd *fds, nfds_t nfds, int num_ready) {
-  struct usbi_transfer *itransfer;
-  UInt32 io_size;
-  IOReturn kresult;
-  int i = 0, ret;
-  UInt32 message;
-
-  usbi_mutex_lock(&ctx->open_devs_lock);
-  for (i = 0; i < nfds && num_ready > 0; i++) {
-    struct pollfd *pollfd = &fds[i];
-    struct libusb_device_handle *handle;
-    struct darwin_device_handle_priv *hpriv = NULL;
-
-    usbi_info (ctx, "checking fd %i with revents = %x", fds[i], pollfd->revents);
-
-    if (!pollfd->revents)
-      continue;
-
-    num_ready--;
-    list_for_each_entry(handle, &ctx->open_devs, list, struct libusb_device_handle) {
-      hpriv =  (struct darwin_device_handle_priv *)handle->os_priv;
-      if (hpriv->fds[0] == pollfd->fd)
-	break;
-    }
-
-    if (!(pollfd->revents & POLLERR)) {
-      ret = read (hpriv->fds[0], &message, sizeof (message));
-      if (ret < sizeof (message))
-	continue;
-    } else
-      /* could not poll the device-- response is to delete the device (this seems a little heavy-handed) */
-      message = MESSAGE_DEVICE_GONE;
-
-    switch (message) {
-    case MESSAGE_DEVICE_GONE:
-      /* remove the device's async port from the runloop */
-      if (hpriv->cfSource) {
-	if (libusb_darwin_acfl)
-	  CFRunLoopRemoveSource (libusb_darwin_acfl, hpriv->cfSource, kCFRunLoopDefaultMode);
-	CFRelease (hpriv->cfSource);
-	hpriv->cfSource = NULL;
-      }
-
-      usbi_remove_pollfd(HANDLE_CTX(handle), hpriv->fds[0]);
-      usbi_handle_disconnect(handle);
-
-      /* done with this device */
-      continue;
-    case MESSAGE_ASYNC_IO_COMPLETE:
-      read (hpriv->fds[0], &itransfer, sizeof (itransfer));
-      read (hpriv->fds[0], &kresult, sizeof (IOReturn));
-      read (hpriv->fds[0], &io_size, sizeof (UInt32));
-
-      darwin_handle_callback (itransfer, kresult, io_size);
-      break;
-    default:
-      usbi_err (ctx, "unknown message received from device pipe");
-    }
-  }
-
-  usbi_mutex_unlock(&ctx->open_devs_lock);
-
-  return 0;
-}
-
-static int darwin_clock_gettime(int clk_id, struct timespec *tp) {
-  mach_timespec_t sys_time;
-  clock_serv_t clock_ref;
-
-  switch (clk_id) {
-  case USBI_CLOCK_REALTIME:
-    /* CLOCK_REALTIME represents time since the epoch */
-    host_get_clock_service(mach_host_self(), CALENDAR_CLOCK, &clock_ref);
-    break;
-  case USBI_CLOCK_MONOTONIC:
-    /* use system boot time as reference for the monotonic clock */
-    host_get_clock_service(mach_host_self(), SYSTEM_CLOCK, &clock_ref);
-    break;
-  default:
-    return LIBUSB_ERROR_INVALID_PARAM;
-  }
-
-  clock_get_time (clock_ref, &sys_time);
-
-  tp->tv_sec  = sys_time.tv_sec;
-  tp->tv_nsec = sys_time.tv_nsec;
-
-  return 0;
-}
-
-const struct usbi_os_backend darwin_backend = {
-	.name = "Darwin",
-	.init = darwin_init,
-	.exit = darwin_exit,
-	.get_device_list = darwin_get_device_list,
-	.get_device_descriptor = darwin_get_device_descriptor,
-	.get_active_config_descriptor = darwin_get_active_config_descriptor,
-	.get_config_descriptor = darwin_get_config_descriptor,
-
-	.open = darwin_open,
-	.close = darwin_close,
-	.get_configuration = darwin_get_configuration,
-	.set_configuration = darwin_set_configuration,
-	.claim_interface = darwin_claim_interface,
-	.release_interface = darwin_release_interface,
-
-	.set_interface_altsetting = darwin_set_interface_altsetting,
-	.clear_halt = darwin_clear_halt,
-	.reset_device = darwin_reset_device,
-
-	.kernel_driver_active = darwin_kernel_driver_active,
-	.detach_kernel_driver = darwin_detach_kernel_driver,
-	.attach_kernel_driver = darwin_attach_kernel_driver,
-
-	.destroy_device = darwin_destroy_device,
-
-	.submit_transfer = darwin_submit_transfer,
-	.cancel_transfer = darwin_cancel_transfer,
-	.clear_transfer_priv = darwin_clear_transfer_priv,
-
-	.handle_events = op_handle_events,
-
-	.clock_gettime = darwin_clock_gettime,
-
-	.device_priv_size = sizeof(struct darwin_device_priv),
-	.device_handle_priv_size = sizeof(struct darwin_device_handle_priv),
-	.transfer_priv_size = sizeof(struct darwin_transfer_priv),
-	.add_iso_packet_size = 0,
-};
-