#include <config.h>
-#include <errno.h>
-#include <inttypes.h>
-#include <process.h>
#include <stdio.h>
#include "libusbi.h"
// Public
enum windows_version windows_version = WINDOWS_UNDEFINED;
- // Global variables for init/exit
+// Global variables for init/exit
static unsigned int init_count;
static bool usbdk_available;
-#if !defined(HAVE_CLOCK_GETTIME)
-// Global variables for clock_gettime mechanism
-static uint64_t hires_ticks_to_ps;
-static uint64_t hires_frequency;
-#endif
-
/*
* Converts a windows error to human readable string
* uses retval as errorcode, or, if 0, use GetLastError()
}
#endif
+/*
+ * Dynamically loads a DLL from the Windows system directory. Unlike the
+ * LoadLibraryA() function, this function will not search through any
+ * directories to try and find the library.
+ */
+HMODULE load_system_library(struct libusb_context *ctx, const char *name)
+{
+ char library_path[MAX_PATH];
+ char *filename_start;
+ UINT length;
+
+ length = GetSystemDirectoryA(library_path, sizeof(library_path));
+ if ((length == 0) || (length >= (UINT)sizeof(library_path))) {
+ usbi_err(ctx, "program assertion failed - could not get system directory");
+ return NULL;
+ }
+
+ filename_start = library_path + length;
+ // Append '\' + name + ".dll" + NUL
+ length += 1 + (UINT)strlen(name) + 4 + 1;
+ if (length >= (UINT)sizeof(library_path)) {
+ usbi_err(ctx, "program assertion failed - library path buffer overflow");
+ return NULL;
+ }
+
+ sprintf(filename_start, "\\%s.dll", name);
+ return LoadLibraryA(library_path);
+}
+
/* Hash table functions - modified From glibc 2.3.2:
[Aho,Sethi,Ullman] Compilers: Principles, Techniques and Tools, 1986
[Knuth] The Art of Computer Programming, part 3 (6.4) */
static bool htab_create(struct libusb_context *ctx)
{
if (htab_table != NULL) {
- usbi_err(ctx, "program assertion falied - hash table already allocated");
+ usbi_err(ctx, "program assertion failed - hash table already allocated");
return true;
}
// Create a mutex
usbi_mutex_init(&htab_mutex);
- usbi_dbg("using %lu entries hash table", HTAB_SIZE);
+ usbi_dbg(ctx, "using %lu entries hash table", HTAB_SIZE);
htab_filled = 0;
// allocate memory and zero out.
if ((htab_table[idx].used == hval) && (strcmp(str, htab_table[idx].str) == 0))
goto out_unlock; // existing hash
- usbi_dbg("hash collision ('%s' vs '%s')", str, htab_table[idx].str);
+ usbi_dbg(NULL, "hash collision ('%s' vs '%s')", str, htab_table[idx].str);
// Second hash function, as suggested in [Knuth]
hval2 = 1UL + hval % (HTAB_SIZE - 2);
case USBD_STATUS_DEVICE_GONE:
return LIBUSB_TRANSFER_NO_DEVICE;
default:
- usbi_dbg("USBD_STATUS 0x%08lx translated to LIBUSB_TRANSFER_ERROR", ULONG_CAST(status));
+ usbi_dbg(NULL, "USBD_STATUS 0x%08lx translated to LIBUSB_TRANSFER_ERROR", ULONG_CAST(status));
return LIBUSB_TRANSFER_ERROR;
}
}
/*
-* Make a transfer complete synchronously
-*/
-void windows_force_sync_completion(OVERLAPPED *overlapped, ULONG size)
+ * Make a transfer complete synchronously
+ */
+void windows_force_sync_completion(struct usbi_transfer *itransfer, ULONG size)
{
+ struct libusb_transfer *transfer = USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
+ struct windows_context_priv *priv = usbi_get_context_priv(TRANSFER_CTX(transfer));
+ struct windows_transfer_priv *transfer_priv = usbi_get_transfer_priv(itransfer);
+ OVERLAPPED *overlapped = &transfer_priv->overlapped;
+
+ usbi_dbg(TRANSFER_CTX(transfer), "transfer %p, length %lu", transfer, ULONG_CAST(size));
+
overlapped->Internal = (ULONG_PTR)STATUS_SUCCESS;
overlapped->InternalHigh = (ULONG_PTR)size;
- SetEvent(overlapped->hEvent);
-}
-static void windows_init_clock(void)
-{
-#if !defined(HAVE_CLOCK_GETTIME)
- LARGE_INTEGER li_frequency;
-
- // Microsoft says that the QueryPerformanceFrequency() and
- // QueryPerformanceCounter() functions always succeed on XP and later
- QueryPerformanceFrequency(&li_frequency);
-
- // The hires frequency can go as high as 4 GHz, so we'll use a conversion
- // to picoseconds to compute the tv_nsecs part in clock_gettime
- hires_frequency = li_frequency.QuadPart;
- hires_ticks_to_ps = UINT64_C(1000000000000) / hires_frequency;
- usbi_dbg("hires timer frequency: %"PRIu64" Hz", hires_frequency);
-#endif
+ if (!PostQueuedCompletionStatus(priv->completion_port, (DWORD)size, (ULONG_PTR)transfer->dev_handle, overlapped))
+ usbi_err(TRANSFER_CTX(transfer), "failed to post I/O completion: %s", windows_error_str(0));
}
/* Windows version detection */
return ret;
}
-static void get_windows_version(void)
+static enum windows_version get_windows_version(void)
{
+ enum windows_version winver;
OSVERSIONINFOEXA vi, vi2;
- const char *arch, *w = NULL;
unsigned major, minor, version;
ULONGLONG major_equal, minor_equal;
+ const char *w, *arch;
bool ws;
- windows_version = WINDOWS_UNDEFINED;
-
memset(&vi, 0, sizeof(vi));
vi.dwOSVersionInfoSize = sizeof(vi);
if (!GetVersionExA((OSVERSIONINFOA *)&vi)) {
memset(&vi, 0, sizeof(vi));
vi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOA);
if (!GetVersionExA((OSVERSIONINFOA *)&vi))
- return;
+ return WINDOWS_UNDEFINED;
}
if (vi.dwPlatformId != VER_PLATFORM_WIN32_NT)
- return;
+ return WINDOWS_UNDEFINED;
if ((vi.dwMajorVersion > 6) || ((vi.dwMajorVersion == 6) && (vi.dwMinorVersion >= 2))) {
// Starting with Windows 8.1 Preview, GetVersionEx() does no longer report the actual OS version
}
if ((vi.dwMajorVersion > 0xf) || (vi.dwMinorVersion > 0xf))
- return;
+ return WINDOWS_UNDEFINED;
ws = (vi.wProductType <= VER_NT_WORKSTATION);
version = vi.dwMajorVersion << 4 | vi.dwMinorVersion;
switch (version) {
- case 0x50: windows_version = WINDOWS_2000; w = "2000"; break;
- case 0x51: windows_version = WINDOWS_XP; w = "XP"; break;
- case 0x52: windows_version = WINDOWS_2003; w = "2003"; break;
- case 0x60: windows_version = WINDOWS_VISTA; w = (ws ? "Vista" : "2008"); break;
- case 0x61: windows_version = WINDOWS_7; w = (ws ? "7" : "2008_R2"); break;
- case 0x62: windows_version = WINDOWS_8; w = (ws ? "8" : "2012"); break;
- case 0x63: windows_version = WINDOWS_8_1; w = (ws ? "8.1" : "2012_R2"); break;
+ case 0x50: winver = WINDOWS_2000; w = "2000"; break;
+ case 0x51: winver = WINDOWS_XP; w = "XP"; break;
+ case 0x52: winver = WINDOWS_2003; w = "2003"; break;
+ case 0x60: winver = WINDOWS_VISTA; w = (ws ? "Vista" : "2008"); break;
+ case 0x61: winver = WINDOWS_7; w = (ws ? "7" : "2008_R2"); break;
+ case 0x62: winver = WINDOWS_8; w = (ws ? "8" : "2012"); break;
+ case 0x63: winver = WINDOWS_8_1; w = (ws ? "8.1" : "2012_R2"); break;
case 0x64: // Early Windows 10 Insider Previews and Windows Server 2017 Technical Preview 1 used version 6.4
- case 0xA0: windows_version = WINDOWS_10; w = (ws ? "10" : "2016"); break;
+ case 0xA0: winver = WINDOWS_10; w = (ws ? "10" : "2016"); break;
default:
- if (version < 0x50) {
- return;
- } else {
- windows_version = WINDOWS_11_OR_LATER;
- w = "11 or later";
- }
+ if (version < 0x50)
+ return WINDOWS_UNDEFINED;
+ winver = WINDOWS_11_OR_LATER;
+ w = "11 or later";
}
arch = is_x64() ? "64-bit" : "32-bit";
if (vi.wServicePackMinor)
- usbi_dbg("Windows %s SP%u.%u %s", w, vi.wServicePackMajor, vi.wServicePackMinor, arch);
+ usbi_dbg(NULL, "Windows %s SP%u.%u %s", w, vi.wServicePackMajor, vi.wServicePackMinor, arch);
else if (vi.wServicePackMajor)
- usbi_dbg("Windows %s SP%u %s", w, vi.wServicePackMajor, arch);
+ usbi_dbg(NULL, "Windows %s SP%u %s", w, vi.wServicePackMajor, arch);
else
- usbi_dbg("Windows %s %s", w, arch);
+ usbi_dbg(NULL, "Windows %s %s", w, arch);
+
+ return winver;
}
-static void windows_transfer_callback(const struct windows_backend *backend,
- struct usbi_transfer *itransfer, DWORD error, DWORD bytes_transferred)
+static unsigned __stdcall windows_iocp_thread(void *arg)
{
- struct windows_transfer_priv *transfer_priv = usbi_get_transfer_priv(itransfer);
- enum libusb_transfer_status status, istatus;
+ struct libusb_context *ctx = arg;
+ struct windows_context_priv *priv = usbi_get_context_priv(ctx);
+ HANDLE iocp = priv->completion_port;
+ DWORD num_bytes;
+ ULONG_PTR completion_key;
+ OVERLAPPED *overlapped;
+ struct libusb_device_handle *dev_handle;
+ struct libusb_device_handle *opened_device_handle;
+ struct windows_device_handle_priv *handle_priv;
+ struct windows_transfer_priv *transfer_priv;
+ struct usbi_transfer *itransfer;
+ bool found;
- usbi_dbg("handling I/O completion with errcode %lu, length %lu",
- ULONG_CAST(error), ULONG_CAST(bytes_transferred));
+ usbi_dbg(ctx, "I/O completion thread started");
- switch (error) {
- case NO_ERROR:
- status = backend->copy_transfer_data(itransfer, bytes_transferred);
- break;
- case ERROR_GEN_FAILURE:
- usbi_dbg("detected endpoint stall");
- status = LIBUSB_TRANSFER_STALL;
- break;
- case ERROR_SEM_TIMEOUT:
- usbi_dbg("detected semaphore timeout");
- status = LIBUSB_TRANSFER_TIMED_OUT;
- break;
- case ERROR_OPERATION_ABORTED:
- istatus = backend->copy_transfer_data(itransfer, bytes_transferred);
- if (istatus != LIBUSB_TRANSFER_COMPLETED)
- usbi_dbg("failed to copy partial data in aborted operation: %d", (int)istatus);
+ while (true) {
+ overlapped = NULL;
+ if (!GetQueuedCompletionStatus(iocp, &num_bytes, &completion_key, &overlapped, INFINITE) && (overlapped == NULL)) {
+ usbi_err(ctx, "GetQueuedCompletionStatus failed: %s", windows_error_str(0));
+ break;
+ }
- usbi_dbg("detected operation aborted");
- status = LIBUSB_TRANSFER_CANCELLED;
- break;
- case ERROR_FILE_NOT_FOUND:
- case ERROR_DEVICE_NOT_CONNECTED:
- usbi_dbg("detected device removed");
- status = LIBUSB_TRANSFER_NO_DEVICE;
- break;
- default:
- usbi_err(ITRANSFER_CTX(itransfer), "detected I/O error %lu: %s",
- ULONG_CAST(error), windows_error_str(error));
- status = LIBUSB_TRANSFER_ERROR;
- break;
- }
+ if (overlapped == NULL) {
+ // Signal to quit
+ if (completion_key != (ULONG_PTR)ctx)
+ usbi_err(ctx, "program assertion failed - overlapped is NULL");
+ break;
+ }
- // Cancel polling
- usbi_close(transfer_priv->pollable_fd.fd);
- transfer_priv->pollable_fd = INVALID_WINFD;
- transfer_priv->handle = NULL;
+ // Find the transfer associated with the OVERLAPPED that just completed.
+ // If we cannot find a match, the I/O operation originated from outside of libusb
+ // (e.g. within libusbK) and we need to ignore it.
+ dev_handle = (struct libusb_device_handle *)completion_key;
- // Backend-specific cleanup
- backend->clear_transfer_priv(itransfer);
+ found = false;
+ transfer_priv = NULL;
- if (status == LIBUSB_TRANSFER_CANCELLED)
- usbi_handle_transfer_cancellation(itransfer);
- else
- usbi_handle_transfer_completion(itransfer, status);
+ // Issue 912: lock opened device handles in context to search the current device handle
+ // to avoid accessing unallocated memory after device has been closed
+ usbi_mutex_lock(&ctx->open_devs_lock);
+ for_each_open_device(ctx, opened_device_handle) {
+ if (dev_handle == opened_device_handle) {
+ handle_priv = usbi_get_device_handle_priv(dev_handle);
+
+ usbi_mutex_lock(&dev_handle->lock);
+ list_for_each_entry(transfer_priv, &handle_priv->active_transfers, list, struct windows_transfer_priv) {
+ if (overlapped == &transfer_priv->overlapped) {
+ // This OVERLAPPED belongs to us, remove the transfer from the device handle's list
+ list_del(&transfer_priv->list);
+ found = true;
+ break;
+ }
+ }
+ usbi_mutex_unlock(&dev_handle->lock);
+ }
+ }
+ usbi_mutex_unlock(&ctx->open_devs_lock);
+
+ if (!found) {
+ usbi_dbg(ctx, "ignoring overlapped %p for handle %p (device %u.%u)",
+ overlapped, dev_handle, dev_handle->dev->bus_number, dev_handle->dev->device_address);
+ continue;
+ }
+
+ itransfer = (struct usbi_transfer *)((unsigned char *)transfer_priv + PTR_ALIGN(sizeof(*transfer_priv)));
+ usbi_dbg(ctx, "transfer %p completed, length %lu",
+ USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer), ULONG_CAST(num_bytes));
+ usbi_signal_transfer_completion(itransfer);
+ }
+
+ usbi_dbg(ctx, "I/O completion thread exiting");
+
+ return 0;
}
static int windows_init(struct libusb_context *ctx)
{
struct windows_context_priv *priv = usbi_get_context_priv(ctx);
- char mutex_name[11 + 8 + 1]; // strlen("libusb_init") + (32-bit hex PID) + '\0'
- HANDLE mutex;
- int r = LIBUSB_ERROR_OTHER;
bool winusb_backend_init = false;
-
- sprintf(mutex_name, "libusb_init%08lX", ULONG_CAST(GetCurrentProcessId() & 0xFFFFFFFFU));
- mutex = CreateMutexA(NULL, FALSE, mutex_name);
- if (mutex == NULL) {
- usbi_err(ctx, "could not create mutex: %s", windows_error_str(0));
- return LIBUSB_ERROR_NO_MEM;
- }
-
- // A successful wait gives this thread ownership of the mutex
- // => any concurent wait stalls until the mutex is released
- if (WaitForSingleObject(mutex, INFINITE) != WAIT_OBJECT_0) {
- usbi_err(ctx, "failure to access mutex: %s", windows_error_str(0));
- CloseHandle(mutex);
- return LIBUSB_ERROR_NO_MEM;
- }
+ int r;
// NB: concurrent usage supposes that init calls are equally balanced with
// exit calls. If init is called more than exit, we will not exit properly
if (++init_count == 1) { // First init?
- get_windows_version();
-
+ windows_version = get_windows_version();
if (windows_version == WINDOWS_UNDEFINED) {
usbi_err(ctx, "failed to detect Windows version");
r = LIBUSB_ERROR_NOT_SUPPORTED;
goto init_exit;
+ } else if (windows_version < WINDOWS_VISTA) {
+ usbi_err(ctx, "Windows version is too old");
+ r = LIBUSB_ERROR_NOT_SUPPORTED;
+ goto init_exit;
}
- windows_init_clock();
-
- if (!htab_create(ctx))
+ if (!htab_create(ctx)) {
+ r = LIBUSB_ERROR_NO_MEM;
goto init_exit;
+ }
r = winusb_backend.init(ctx);
if (r != LIBUSB_SUCCESS)
r = usbdk_backend.init(ctx);
if (r == LIBUSB_SUCCESS) {
- usbi_dbg("UsbDk backend is available");
+ usbi_dbg(ctx, "UsbDk backend is available");
usbdk_available = true;
} else {
usbi_info(ctx, "UsbDk backend is not available");
// Do not report this as an error
- r = LIBUSB_SUCCESS;
}
}
// By default, new contexts will use the WinUSB backend
priv->backend = &winusb_backend;
+ r = LIBUSB_ERROR_NO_MEM;
+
+ // Use an I/O completion port to manage all transfers for this context
+ priv->completion_port = CreateIoCompletionPort(INVALID_HANDLE_VALUE, NULL, 0, 1);
+ if (priv->completion_port == NULL) {
+ usbi_err(ctx, "failed to create I/O completion port: %s", windows_error_str(0));
+ goto init_exit;
+ }
+
+ // And a dedicated thread to wait for I/O completions
+ priv->completion_port_thread = (HANDLE)_beginthreadex(NULL, 0, windows_iocp_thread, ctx, 0, NULL);
+ if (priv->completion_port_thread == NULL) {
+ usbi_err(ctx, "failed to create I/O completion port thread");
+ CloseHandle(priv->completion_port);
+ goto init_exit;
+ }
+
r = LIBUSB_SUCCESS;
init_exit: // Holds semaphore here
if ((init_count == 1) && (r != LIBUSB_SUCCESS)) { // First init failed?
+ if (usbdk_available) {
+ usbdk_backend.exit(ctx);
+ usbdk_available = false;
+ }
if (winusb_backend_init)
winusb_backend.exit(ctx);
htab_destroy();
--init_count;
}
- ReleaseMutex(mutex);
- CloseHandle(mutex);
return r;
}
static void windows_exit(struct libusb_context *ctx)
{
- char mutex_name[11 + 8 + 1]; // strlen("libusb_init") + (32-bit hex PID) + '\0'
- HANDLE mutex;
+ struct windows_context_priv *priv = usbi_get_context_priv(ctx);
- sprintf(mutex_name, "libusb_init%08lX", ULONG_CAST(GetCurrentProcessId() & 0xFFFFFFFFU));
- mutex = CreateMutexA(NULL, FALSE, mutex_name);
- if (mutex == NULL)
- return;
+ // A NULL completion status will indicate to the thread that it is time to exit
+ if (!PostQueuedCompletionStatus(priv->completion_port, 0, (ULONG_PTR)ctx, NULL))
+ usbi_err(ctx, "failed to post I/O completion: %s", windows_error_str(0));
- // A successful wait gives this thread ownership of the mutex
- // => any concurent wait stalls until the mutex is released
- if (WaitForSingleObject(mutex, INFINITE) != WAIT_OBJECT_0) {
- usbi_err(ctx, "failed to access mutex: %s", windows_error_str(0));
- CloseHandle(mutex);
- return;
- }
+ if (WaitForSingleObject(priv->completion_port_thread, INFINITE) == WAIT_FAILED)
+ usbi_err(ctx, "failed to wait for I/O completion port thread: %s", windows_error_str(0));
+
+ CloseHandle(priv->completion_port_thread);
+ CloseHandle(priv->completion_port);
// Only works if exits and inits are balanced exactly
if (--init_count == 0) { // Last exit
winusb_backend.exit(ctx);
htab_destroy();
}
-
- ReleaseMutex(mutex);
- CloseHandle(mutex);
}
static int windows_set_option(struct libusb_context *ctx, enum libusb_option option, va_list ap)
UNUSED(ap);
- switch ((int)option) {
- case LIBUSB_OPTION_USE_USBDK:
- if (usbdk_available) {
- usbi_dbg("switching context %p to use UsbDk backend", ctx);
- priv->backend = &usbdk_backend;
- } else {
+ if (option == LIBUSB_OPTION_USE_USBDK) {
+ if (!usbdk_available) {
usbi_err(ctx, "UsbDk backend not available");
return LIBUSB_ERROR_NOT_FOUND;
}
+ usbi_dbg(ctx, "switching context %p to use UsbDk backend", ctx);
+ priv->backend = &usbdk_backend;
return LIBUSB_SUCCESS;
- default:
- return LIBUSB_ERROR_NOT_SUPPORTED;
}
+
+ return LIBUSB_ERROR_NOT_SUPPORTED;
}
static int windows_get_device_list(struct libusb_context *ctx, struct discovered_devs **discdevs)
static int windows_open(struct libusb_device_handle *dev_handle)
{
struct windows_context_priv *priv = usbi_get_context_priv(HANDLE_CTX(dev_handle));
+ struct windows_device_handle_priv *handle_priv = usbi_get_device_handle_priv(dev_handle);
+
+ list_init(&handle_priv->active_transfers);
return priv->backend->open(dev_handle);
}
static int windows_submit_transfer(struct usbi_transfer *itransfer)
{
struct libusb_transfer *transfer = USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
- struct libusb_context *ctx = TRANSFER_CTX(transfer);
+ struct libusb_device_handle *dev_handle = transfer->dev_handle;
+ struct libusb_context *ctx = HANDLE_CTX(dev_handle);
struct windows_context_priv *priv = usbi_get_context_priv(ctx);
+ struct windows_device_handle_priv *handle_priv = usbi_get_device_handle_priv(dev_handle);
struct windows_transfer_priv *transfer_priv = usbi_get_transfer_priv(itransfer);
- short events;
int r;
switch (transfer->type) {
case LIBUSB_TRANSFER_TYPE_CONTROL:
- events = (transfer->buffer[0] & LIBUSB_ENDPOINT_IN) ? POLLIN : POLLOUT;
- break;
case LIBUSB_TRANSFER_TYPE_BULK:
case LIBUSB_TRANSFER_TYPE_INTERRUPT:
case LIBUSB_TRANSFER_TYPE_ISOCHRONOUS:
- events = IS_XFERIN(transfer) ? POLLIN : POLLOUT;
break;
case LIBUSB_TRANSFER_TYPE_BULK_STREAM:
usbi_warn(ctx, "bulk stream transfers are not yet supported on this platform");
return LIBUSB_ERROR_INVALID_PARAM;
}
- // Because a Windows OVERLAPPED is used for poll emulation,
- // a pollable fd is created and stored with each transfer
- transfer_priv->pollable_fd = usbi_create_fd();
- if (transfer_priv->pollable_fd.fd < 0) {
- usbi_err(ctx, "failed to create pollable fd");
- return LIBUSB_ERROR_NO_MEM;
- }
-
if (transfer_priv->handle != NULL) {
usbi_err(ctx, "program assertion failed - transfer HANDLE is not NULL");
transfer_priv->handle = NULL;
}
+ // Add transfer to the device handle's list
+ usbi_mutex_lock(&dev_handle->lock);
+ list_add_tail(&transfer_priv->list, &handle_priv->active_transfers);
+ usbi_mutex_unlock(&dev_handle->lock);
+
r = priv->backend->submit_transfer(itransfer);
if (r != LIBUSB_SUCCESS) {
+ // Remove the unsuccessful transfer from the device handle's list
+ usbi_mutex_lock(&dev_handle->lock);
+ list_del(&transfer_priv->list);
+ usbi_mutex_unlock(&dev_handle->lock);
+
// Always call the backend's clear_transfer_priv() function on failure
priv->backend->clear_transfer_priv(itransfer);
- // Release the pollable fd since it won't be used
- usbi_close(transfer_priv->pollable_fd.fd);
- transfer_priv->pollable_fd = INVALID_WINFD;
transfer_priv->handle = NULL;
return r;
}
if (transfer_priv->handle == NULL)
usbi_err(ctx, "program assertion failed - transfer HANDLE is NULL after transfer was submitted");
- // We don't want to start monitoring the pollable fd before the transfer
- // has been submitted, so start monitoring it now. Note that if the
- // usbi_add_pollfd() function fails, the user will never get notified
- // that the transfer has completed. We don't attempt any cleanup if this
- // happens because the transfer is already in progress and could even have
- // completed
- if (usbi_add_pollfd(ctx, transfer_priv->pollable_fd.fd, events))
- usbi_err(ctx, "failed to add pollable fd %d for transfer %p",
- transfer_priv->pollable_fd.fd, transfer);
-
return r;
}
// Try CancelIoEx() on the transfer
// If that fails, fall back to the backend's cancel_transfer()
// function if it is available
- if (CancelIoEx(transfer_priv->handle, transfer_priv->pollable_fd.overlapped))
+ if (CancelIoEx(transfer_priv->handle, &transfer_priv->overlapped))
return LIBUSB_SUCCESS;
else if (GetLastError() == ERROR_NOT_FOUND)
return LIBUSB_ERROR_NOT_FOUND;
return LIBUSB_ERROR_NOT_SUPPORTED;
}
-static int windows_handle_events(struct libusb_context *ctx, struct pollfd *fds, usbi_nfds_t nfds, int num_ready)
+static int windows_handle_transfer_completion(struct usbi_transfer *itransfer)
{
+ struct libusb_context *ctx = ITRANSFER_CTX(itransfer);
struct windows_context_priv *priv = usbi_get_context_priv(ctx);
- struct usbi_transfer *itransfer;
- struct windows_transfer_priv *transfer_priv;
+ const struct windows_backend *backend = priv->backend;
+ struct windows_transfer_priv *transfer_priv = usbi_get_transfer_priv(itransfer);
+ enum libusb_transfer_status status, istatus;
DWORD result, bytes_transferred;
- usbi_nfds_t i;
- int r = LIBUSB_SUCCESS;
-
- usbi_mutex_lock(&ctx->open_devs_lock);
- for (i = 0; i < nfds && num_ready > 0; i++) {
- usbi_dbg("checking fd %d with revents = %04x", fds[i].fd, fds[i].revents);
- if (!fds[i].revents)
- continue;
-
- num_ready--;
+ if (GetOverlappedResult(transfer_priv->handle, &transfer_priv->overlapped, &bytes_transferred, FALSE))
+ result = NO_ERROR;
+ else
+ result = GetLastError();
- transfer_priv = NULL;
- usbi_mutex_lock(&ctx->flying_transfers_lock);
- list_for_each_entry(itransfer, &ctx->flying_transfers, list, struct usbi_transfer) {
- transfer_priv = usbi_get_transfer_priv(itransfer);
- if (transfer_priv->pollable_fd.fd == fds[i].fd)
- break;
- transfer_priv = NULL;
- }
- usbi_mutex_unlock(&ctx->flying_transfers_lock);
+ usbi_dbg(ctx, "handling transfer %p completion with errcode %lu, length %lu",
+ USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer), ULONG_CAST(result), ULONG_CAST(bytes_transferred));
- if (transfer_priv == NULL) {
- usbi_err(ctx, "could not find a matching transfer for fd %d", fds[i].fd);
- r = LIBUSB_ERROR_NOT_FOUND;
- break;
- }
+ switch (result) {
+ case NO_ERROR:
+ status = backend->copy_transfer_data(itransfer, bytes_transferred);
+ break;
+ case ERROR_GEN_FAILURE:
+ usbi_dbg(ctx, "detected endpoint stall");
+ status = LIBUSB_TRANSFER_STALL;
+ break;
+ case ERROR_SEM_TIMEOUT:
+ usbi_dbg(ctx, "detected semaphore timeout");
+ status = LIBUSB_TRANSFER_TIMED_OUT;
+ break;
+ case ERROR_OPERATION_ABORTED:
+ istatus = backend->copy_transfer_data(itransfer, bytes_transferred);
+ if (istatus != LIBUSB_TRANSFER_COMPLETED)
+ usbi_dbg(ctx, "failed to copy partial data in aborted operation: %d", (int)istatus);
- usbi_remove_pollfd(ctx, transfer_priv->pollable_fd.fd);
+ usbi_dbg(ctx, "detected operation aborted");
+ status = LIBUSB_TRANSFER_CANCELLED;
+ break;
+ case ERROR_FILE_NOT_FOUND:
+ case ERROR_DEVICE_NOT_CONNECTED:
+ case ERROR_NO_SUCH_DEVICE:
+ usbi_dbg(ctx, "detected device removed");
+ status = LIBUSB_TRANSFER_NO_DEVICE;
+ break;
+ default:
+ usbi_err(ctx, "detected I/O error %lu: %s",
+ ULONG_CAST(result), windows_error_str(result));
+ status = LIBUSB_TRANSFER_ERROR;
+ break;
+ }
- if (GetOverlappedResult(transfer_priv->handle, transfer_priv->pollable_fd.overlapped, &bytes_transferred, FALSE))
- result = NO_ERROR;
- else
- result = GetLastError();
+ transfer_priv->handle = NULL;
- windows_transfer_callback(priv->backend, itransfer, result, bytes_transferred);
- }
- usbi_mutex_unlock(&ctx->open_devs_lock);
+ // Backend-specific cleanup
+ backend->clear_transfer_priv(itransfer);
- return r;
+ if (status == LIBUSB_TRANSFER_CANCELLED)
+ return usbi_handle_transfer_cancellation(itransfer);
+ else
+ return usbi_handle_transfer_completion(itransfer, status);
}
-#if !defined(HAVE_CLOCK_GETTIME)
-int usbi_clock_gettime(int clk_id, struct timespec *tp)
+void usbi_get_monotonic_time(struct timespec *tp)
{
+ static LONG hires_counter_init;
+ static uint64_t hires_ticks_to_ps;
+ static uint64_t hires_frequency;
LARGE_INTEGER hires_counter;
-#if !defined(_MSC_VER) || (_MSC_VER < 1900)
- FILETIME filetime;
- ULARGE_INTEGER rtime;
-#endif
- switch (clk_id) {
- case USBI_CLOCK_MONOTONIC:
- if (hires_frequency) {
- QueryPerformanceCounter(&hires_counter);
- tp->tv_sec = (long)(hires_counter.QuadPart / hires_frequency);
- tp->tv_nsec = (long)(((hires_counter.QuadPart % hires_frequency) * hires_ticks_to_ps) / UINT64_C(1000));
- return 0;
- }
- // Return real-time if monotonic was not detected @ timer init
- // Fall through
- case USBI_CLOCK_REALTIME:
-#if defined(_MSC_VER) && (_MSC_VER >= 1900)
- if (!timespec_get(tp, TIME_UTC)) {
- errno = EIO;
- return -1;
- }
-#else
- // We follow http://msdn.microsoft.com/en-us/library/ms724928%28VS.85%29.aspx
- // with a predef epoch time to have an epoch that starts at 1970.01.01 00:00
- // Note however that our resolution is bounded by the Windows system time
- // functions and is at best of the order of 1 ms (or, usually, worse)
- GetSystemTimeAsFileTime(&filetime);
- rtime.LowPart = filetime.dwLowDateTime;
- rtime.HighPart = filetime.dwHighDateTime;
- rtime.QuadPart -= EPOCH_TIME;
- tp->tv_sec = (long)(rtime.QuadPart / 10000000);
- tp->tv_nsec = (long)((rtime.QuadPart % 10000000) * 100);
-#endif
- return 0;
- default:
- errno = EINVAL;
- return -1;
+ if (InterlockedExchange(&hires_counter_init, 1L) == 0L) {
+ LARGE_INTEGER li_frequency;
+
+ // Microsoft says that the QueryPerformanceFrequency() and
+ // QueryPerformanceCounter() functions always succeed on XP and later
+ QueryPerformanceFrequency(&li_frequency);
+
+ // The hires frequency can go as high as 4 GHz, so we'll use a conversion
+ // to picoseconds to compute the tv_nsecs part
+ hires_frequency = li_frequency.QuadPart;
+ hires_ticks_to_ps = UINT64_C(1000000000000) / hires_frequency;
}
+
+ QueryPerformanceCounter(&hires_counter);
+ tp->tv_sec = (long)(hires_counter.QuadPart / hires_frequency);
+ tp->tv_nsec = (long)(((hires_counter.QuadPart % hires_frequency) * hires_ticks_to_ps) / UINT64_C(1000));
}
-#endif
// NB: MSVC6 does not support named initializers.
const struct usbi_os_backend usbi_backend = {
windows_submit_transfer,
windows_cancel_transfer,
NULL, /* clear_transfer_priv */
- windows_handle_events,
- NULL, /* handle_transfer_completion */
+ NULL, /* handle_events */
+ windows_handle_transfer_completion,
sizeof(struct windows_context_priv),
sizeof(union windows_device_priv),
- sizeof(union windows_device_handle_priv),
+ sizeof(struct windows_device_handle_priv),
sizeof(struct windows_transfer_priv),
};
projects / platform / upstream / libusb.git / blobdiff