+++ /dev/null
-/*
- * windows backend for libusb 1.0
- * Copyright © 2009-2012 Pete Batard <pete@akeo.ie>
- * With contributions from Michael Plante, Orin Eman et al.
- * Parts of this code adapted from libusb-win32-v1 by Stephan Meyer
- * HID Reports IOCTLs inspired from HIDAPI by Alan Ott, Signal 11 Software
- * Hash table functions adapted from glibc, by Ulrich Drepper et al.
- * Major code testing contribution by Xiaofan Chen
- *
- * 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 <inttypes.h>
-#include <process.h>
-#include <stdio.h>
-
-#include "libusbi.h"
-#include "windows_common.h"
-#include "windows_nt_common.h"
-
-// Public
-BOOL (WINAPI *pCancelIoEx)(HANDLE, LPOVERLAPPED);
-enum windows_version windows_version = WINDOWS_UNDEFINED;
-
- // Global variables for init/exit
-static unsigned int init_count = 0;
-static bool usbdk_available = false;
-
-// Global variables for clock_gettime mechanism
-static uint64_t hires_ticks_to_ps;
-static uint64_t hires_frequency;
-
-#define TIMER_REQUEST_RETRY_MS 100
-#define WM_TIMER_REQUEST (WM_USER + 1)
-#define WM_TIMER_EXIT (WM_USER + 2)
-
-// used for monotonic clock_gettime()
-struct timer_request {
- struct timespec *tp;
- HANDLE event;
-};
-
-// Timer thread
-static HANDLE timer_thread = NULL;
-static DWORD timer_thread_id = 0;
-
-/* Kernel32 dependencies */
-DLL_DECLARE_HANDLE(Kernel32);
-/* This call is only available from XP SP2 */
-DLL_DECLARE_FUNC_PREFIXED(WINAPI, BOOL, p, IsWow64Process, (HANDLE, PBOOL));
-
-/* User32 dependencies */
-DLL_DECLARE_HANDLE(User32);
-DLL_DECLARE_FUNC_PREFIXED(WINAPI, BOOL, p, GetMessageA, (LPMSG, HWND, UINT, UINT));
-DLL_DECLARE_FUNC_PREFIXED(WINAPI, BOOL, p, PeekMessageA, (LPMSG, HWND, UINT, UINT, UINT));
-DLL_DECLARE_FUNC_PREFIXED(WINAPI, BOOL, p, PostThreadMessageA, (DWORD, UINT, WPARAM, LPARAM));
-
-static unsigned __stdcall windows_clock_gettime_threaded(void *param);
-
-/*
-* Converts a windows error to human readable string
-* uses retval as errorcode, or, if 0, use GetLastError()
-*/
-#if defined(ENABLE_LOGGING)
-const char *windows_error_str(DWORD error_code)
-{
- static char err_string[ERR_BUFFER_SIZE];
-
- DWORD size;
- int len;
-
- if (error_code == 0)
- error_code = GetLastError();
-
- len = sprintf(err_string, "[%u] ", (unsigned int)error_code);
-
- // Translate codes returned by SetupAPI. The ones we are dealing with are either
- // in 0x0000xxxx or 0xE000xxxx and can be distinguished from standard error codes.
- // See http://msdn.microsoft.com/en-us/library/windows/hardware/ff545011.aspx
- switch (error_code & 0xE0000000) {
- case 0:
- error_code = HRESULT_FROM_WIN32(error_code); // Still leaves ERROR_SUCCESS unmodified
- break;
- case 0xE0000000:
- error_code = 0x80000000 | (FACILITY_SETUPAPI << 16) | (error_code & 0x0000FFFF);
- break;
- default:
- break;
- }
-
- size = FormatMessageA(FORMAT_MESSAGE_FROM_SYSTEM|FORMAT_MESSAGE_IGNORE_INSERTS,
- NULL, error_code, MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
- &err_string[len], ERR_BUFFER_SIZE - len, NULL);
- if (size == 0) {
- DWORD format_error = GetLastError();
- if (format_error)
- snprintf(err_string, ERR_BUFFER_SIZE,
- "Windows error code %u (FormatMessage error code %u)",
- (unsigned int)error_code, (unsigned int)format_error);
- else
- snprintf(err_string, ERR_BUFFER_SIZE, "Unknown error code %u", (unsigned int)error_code);
- } else {
- // Remove CRLF from end of message, if present
- size_t pos = len + size - 2;
- if (err_string[pos] == '\r')
- err_string[pos] = '\0';
- }
-
- return err_string;
-}
-#endif
-
-static inline struct windows_context_priv *_context_priv(struct libusb_context *ctx)
-{
- return (struct windows_context_priv *)ctx->os_priv;
-}
-
-/* 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) */
-
-#define HTAB_SIZE 1021UL // *MUST* be a prime number!!
-
-typedef struct htab_entry {
- unsigned long used;
- char *str;
-} htab_entry;
-
-static htab_entry *htab_table = NULL;
-static usbi_mutex_t htab_mutex;
-static unsigned long htab_filled;
-
-/* Before using the hash table we must allocate memory for it.
- We allocate one element more as the found prime number says.
- This is done for more effective indexing as explained in the
- comment for the hash function. */
-static bool htab_create(struct libusb_context *ctx)
-{
- if (htab_table != NULL) {
- usbi_err(ctx, "hash table already allocated");
- return true;
- }
-
- // Create a mutex
- usbi_mutex_init(&htab_mutex);
-
- usbi_dbg("using %lu entries hash table", HTAB_SIZE);
- htab_filled = 0;
-
- // allocate memory and zero out.
- htab_table = calloc(HTAB_SIZE + 1, sizeof(htab_entry));
- if (htab_table == NULL) {
- usbi_err(ctx, "could not allocate space for hash table");
- return false;
- }
-
- return true;
-}
-
-/* After using the hash table it has to be destroyed. */
-static void htab_destroy(void)
-{
- unsigned long i;
-
- if (htab_table == NULL)
- return;
-
- for (i = 0; i < HTAB_SIZE; i++)
- free(htab_table[i].str);
-
- safe_free(htab_table);
-
- usbi_mutex_destroy(&htab_mutex);
-}
-
-/* This is the search function. It uses double hashing with open addressing.
- We use a trick to speed up the lookup. The table is created with one
- more element available. This enables us to use the index zero special.
- This index will never be used because we store the first hash index in
- the field used where zero means not used. Every other value means used.
- The used field can be used as a first fast comparison for equality of
- the stored and the parameter value. This helps to prevent unnecessary
- expensive calls of strcmp. */
-unsigned long htab_hash(const char *str)
-{
- unsigned long hval, hval2;
- unsigned long idx;
- unsigned long r = 5381;
- int c;
- const char *sz = str;
-
- if (str == NULL)
- return 0;
-
- // Compute main hash value (algorithm suggested by Nokia)
- while ((c = *sz++) != 0)
- r = ((r << 5) + r) + c;
- if (r == 0)
- ++r;
-
- // compute table hash: simply take the modulus
- hval = r % HTAB_SIZE;
- if (hval == 0)
- ++hval;
-
- // Try the first index
- idx = hval;
-
- // Mutually exclusive access (R/W lock would be better)
- usbi_mutex_lock(&htab_mutex);
-
- if (htab_table[idx].used) {
- 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);
-
- // Second hash function, as suggested in [Knuth]
- hval2 = 1 + hval % (HTAB_SIZE - 2);
-
- do {
- // Because size is prime this guarantees to step through all available indexes
- if (idx <= hval2)
- idx = HTAB_SIZE + idx - hval2;
- else
- idx -= hval2;
-
- // If we visited all entries leave the loop unsuccessfully
- if (idx == hval)
- break;
-
- // If entry is found use it.
- if ((htab_table[idx].used == hval) && (strcmp(str, htab_table[idx].str) == 0))
- goto out_unlock;
- } while (htab_table[idx].used);
- }
-
- // Not found => New entry
-
- // If the table is full return an error
- if (htab_filled >= HTAB_SIZE) {
- usbi_err(NULL, "hash table is full (%lu entries)", HTAB_SIZE);
- idx = 0;
- goto out_unlock;
- }
-
- htab_table[idx].str = _strdup(str);
- if (htab_table[idx].str == NULL) {
- usbi_err(NULL, "could not duplicate string for hash table");
- idx = 0;
- goto out_unlock;
- }
-
- htab_table[idx].used = hval;
- ++htab_filled;
-
-out_unlock:
- usbi_mutex_unlock(&htab_mutex);
-
- return idx;
-}
-
-/*
-* Make a transfer complete synchronously
-*/
-void windows_force_sync_completion(OVERLAPPED *overlapped, ULONG size)
-{
- overlapped->Internal = STATUS_COMPLETED_SYNCHRONOUSLY;
- overlapped->InternalHigh = size;
- SetEvent(overlapped->hEvent);
-}
-
-static BOOL windows_init_dlls(void)
-{
- DLL_GET_HANDLE(Kernel32);
- DLL_LOAD_FUNC_PREFIXED(Kernel32, p, IsWow64Process, FALSE);
- pCancelIoEx = (BOOL (WINAPI *)(HANDLE, LPOVERLAPPED))
- GetProcAddress(DLL_HANDLE_NAME(Kernel32), "CancelIoEx");
- usbi_dbg("Will use CancelIo%s for I/O cancellation", pCancelIoEx ? "Ex" : "");
-
- DLL_GET_HANDLE(User32);
- DLL_LOAD_FUNC_PREFIXED(User32, p, GetMessageA, TRUE);
- DLL_LOAD_FUNC_PREFIXED(User32, p, PeekMessageA, TRUE);
- DLL_LOAD_FUNC_PREFIXED(User32, p, PostThreadMessageA, TRUE);
-
- return TRUE;
-}
-
-static void windows_exit_dlls(void)
-{
- DLL_FREE_HANDLE(Kernel32);
- DLL_FREE_HANDLE(User32);
-}
-
-static bool windows_init_clock(struct libusb_context *ctx)
-{
- DWORD_PTR affinity, dummy;
- HANDLE event;
- LARGE_INTEGER li_frequency;
- int i;
-
- if (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 available (Frequency: %"PRIu64" Hz)", hires_frequency);
-
- // Because QueryPerformanceCounter might report different values when
- // running on different cores, we create a separate thread for the timer
- // calls, which we glue to the first available core always to prevent timing discrepancies.
- if (!GetProcessAffinityMask(GetCurrentProcess(), &affinity, &dummy) || (affinity == 0)) {
- usbi_err(ctx, "could not get process affinity: %s", windows_error_str(0));
- return false;
- }
-
- // The process affinity mask is a bitmask where each set bit represents a core on
- // which this process is allowed to run, so we find the first set bit
- for (i = 0; !(affinity & (DWORD_PTR)(1 << i)); i++);
- affinity = (DWORD_PTR)(1 << i);
-
- usbi_dbg("timer thread will run on core #%d", i);
-
- event = CreateEvent(NULL, FALSE, FALSE, NULL);
- if (event == NULL) {
- usbi_err(ctx, "could not create event: %s", windows_error_str(0));
- return false;
- }
-
- timer_thread = (HANDLE)_beginthreadex(NULL, 0, windows_clock_gettime_threaded, (void *)event,
- 0, (unsigned int *)&timer_thread_id);
- if (timer_thread == NULL) {
- usbi_err(ctx, "unable to create timer thread - aborting");
- CloseHandle(event);
- return false;
- }
-
- if (!SetThreadAffinityMask(timer_thread, affinity))
- usbi_warn(ctx, "unable to set timer thread affinity, timer discrepancies may arise");
-
- // Wait for timer thread to init before continuing.
- if (WaitForSingleObject(event, INFINITE) != WAIT_OBJECT_0) {
- usbi_err(ctx, "failed to wait for timer thread to become ready - aborting");
- CloseHandle(event);
- return false;
- }
-
- CloseHandle(event);
- } else {
- usbi_dbg("no hires timer available on this platform");
- hires_frequency = 0;
- hires_ticks_to_ps = UINT64_C(0);
- }
-
- return true;
-}
-
-static void windows_destroy_clock(void)
-{
- if (timer_thread) {
- // actually the signal to quit the thread.
- if (!pPostThreadMessageA(timer_thread_id, WM_TIMER_EXIT, 0, 0)
- || (WaitForSingleObject(timer_thread, INFINITE) != WAIT_OBJECT_0)) {
- usbi_dbg("could not wait for timer thread to quit");
- TerminateThread(timer_thread, 1);
- // shouldn't happen, but we're destroying
- // all objects it might have held anyway.
- }
- CloseHandle(timer_thread);
- timer_thread = NULL;
- timer_thread_id = 0;
- }
-}
-
-/* Windows version detection */
-static BOOL is_x64(void)
-{
- BOOL ret = FALSE;
-
- // Detect if we're running a 32 or 64 bit system
- if (sizeof(uintptr_t) < 8) {
- if (pIsWow64Process != NULL)
- pIsWow64Process(GetCurrentProcess(), &ret);
- } else {
- ret = TRUE;
- }
-
- return ret;
-}
-
-static void get_windows_version(void)
-{
- OSVERSIONINFOEXA vi, vi2;
- const char *arch, *w = NULL;
- unsigned major, minor, version;
- ULONGLONG major_equal, minor_equal;
- 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;
- }
-
- if (vi.dwPlatformId != VER_PLATFORM_WIN32_NT)
- return;
-
- 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
- // See: http://msdn.microsoft.com/en-us/library/windows/desktop/dn302074.aspx
-
- major_equal = VerSetConditionMask(0, VER_MAJORVERSION, VER_EQUAL);
- for (major = vi.dwMajorVersion; major <= 9; major++) {
- memset(&vi2, 0, sizeof(vi2));
- vi2.dwOSVersionInfoSize = sizeof(vi2);
- vi2.dwMajorVersion = major;
- if (!VerifyVersionInfoA(&vi2, VER_MAJORVERSION, major_equal))
- continue;
-
- if (vi.dwMajorVersion < major) {
- vi.dwMajorVersion = major;
- vi.dwMinorVersion = 0;
- }
-
- minor_equal = VerSetConditionMask(0, VER_MINORVERSION, VER_EQUAL);
- for (minor = vi.dwMinorVersion; minor <= 9; minor++) {
- memset(&vi2, 0, sizeof(vi2));
- vi2.dwOSVersionInfoSize = sizeof(vi2);
- vi2.dwMinorVersion = minor;
- if (!VerifyVersionInfoA(&vi2, VER_MINORVERSION, minor_equal))
- continue;
-
- vi.dwMinorVersion = minor;
- break;
- }
-
- break;
- }
- }
-
- if ((vi.dwMajorVersion > 0xf) || (vi.dwMinorVersion > 0xf))
- return;
-
- 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 0x64: windows_version = WINDOWS_10; w = (ws ? "10" : "2016"); break;
- default:
- if (version < 0x50) {
- return;
- } else {
- windows_version = 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);
- else if (vi.wServicePackMajor)
- usbi_dbg("Windows %s SP%u %s", w, vi.wServicePackMajor, arch);
- else
- usbi_dbg("Windows %s %s", w, arch);
-}
-
-/*
-* Monotonic and real time functions
-*/
-static unsigned __stdcall windows_clock_gettime_threaded(void *param)
-{
- struct timer_request *request;
- LARGE_INTEGER hires_counter;
- MSG msg;
-
- // The following call will create this thread's message queue
- // See https://msdn.microsoft.com/en-us/library/windows/desktop/ms644946.aspx
- pPeekMessageA(&msg, NULL, WM_USER, WM_USER, PM_NOREMOVE);
-
- // Signal windows_init_clock() that we're ready to service requests
- if (!SetEvent((HANDLE)param))
- usbi_dbg("SetEvent failed for timer init event: %s", windows_error_str(0));
- param = NULL;
-
- // Main loop - wait for requests
- while (1) {
- if (pGetMessageA(&msg, NULL, WM_TIMER_REQUEST, WM_TIMER_EXIT) == -1) {
- usbi_err(NULL, "GetMessage failed for timer thread: %s", windows_error_str(0));
- return 1;
- }
-
- switch (msg.message) {
- case WM_TIMER_REQUEST:
- // Requests to this thread are for hires always
- // Microsoft says that this function always succeeds on XP and later
- // See https://msdn.microsoft.com/en-us/library/windows/desktop/ms644904.aspx
- request = (struct timer_request *)msg.lParam;
- QueryPerformanceCounter(&hires_counter);
- request->tp->tv_sec = (long)(hires_counter.QuadPart / hires_frequency);
- request->tp->tv_nsec = (long)(((hires_counter.QuadPart % hires_frequency) / 1000) * hires_ticks_to_ps);
- if (!SetEvent(request->event))
- usbi_err(NULL, "SetEvent failed for timer request: %s", windows_error_str(0));
- break;
- case WM_TIMER_EXIT:
- usbi_dbg("timer thread quitting");
- return 0;
- }
- }
-}
-
-static void windows_transfer_callback(const struct windows_backend *backend,
- struct usbi_transfer *itransfer, DWORD io_result, DWORD io_size)
-{
- int status, istatus;
-
- usbi_dbg("handling I/O completion with errcode %u, size %u", (unsigned int)io_result, (unsigned int)io_size);
-
- switch (io_result) {
- case NO_ERROR:
- status = backend->copy_transfer_data(itransfer, (uint32_t)io_size);
- 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, (uint32_t)io_size);
- if (istatus != LIBUSB_TRANSFER_COMPLETED)
- usbi_dbg("Failed to copy partial data in aborted operation: %d", istatus);
-
- usbi_dbg("detected operation aborted");
- status = LIBUSB_TRANSFER_CANCELLED;
- break;
- case ERROR_FILE_NOT_FOUND:
- usbi_dbg("detected device removed");
- status = LIBUSB_TRANSFER_NO_DEVICE;
- break;
- default:
- usbi_err(ITRANSFER_CTX(itransfer), "detected I/O error %u: %s", (unsigned int)io_result, windows_error_str(io_result));
- status = LIBUSB_TRANSFER_ERROR;
- break;
- }
- backend->clear_transfer_priv(itransfer); // Cancel polling
- if (status == LIBUSB_TRANSFER_CANCELLED)
- usbi_handle_transfer_cancellation(itransfer);
- else
- usbi_handle_transfer_completion(itransfer, (enum libusb_transfer_status)status);
-}
-
-static void windows_handle_callback(const struct windows_backend *backend,
- struct usbi_transfer *itransfer, DWORD io_result, DWORD io_size)
-{
- struct libusb_transfer *transfer = USBI_TRANSFER_TO_LIBUSB_TRANSFER(itransfer);
-
- switch (transfer->type) {
- case LIBUSB_TRANSFER_TYPE_CONTROL:
- case LIBUSB_TRANSFER_TYPE_BULK:
- case LIBUSB_TRANSFER_TYPE_INTERRUPT:
- case LIBUSB_TRANSFER_TYPE_ISOCHRONOUS:
- windows_transfer_callback(backend, itransfer, io_result, io_size);
- break;
- case LIBUSB_TRANSFER_TYPE_BULK_STREAM:
- usbi_warn(ITRANSFER_CTX(itransfer), "bulk stream transfers are not yet supported on this platform");
- break;
- default:
- usbi_err(ITRANSFER_CTX(itransfer), "unknown endpoint type %d", transfer->type);
- }
-}
-
-static int windows_init(struct libusb_context *ctx)
-{
- struct windows_context_priv *priv = _context_priv(ctx);
- HANDLE semaphore;
- char sem_name[11 + 8 + 1]; // strlen("libusb_init") + (32-bit hex PID) + '\0'
- int r = LIBUSB_ERROR_OTHER;
- bool winusb_backend_init = false;
-
- sprintf(sem_name, "libusb_init%08X", (unsigned int)(GetCurrentProcessId() & 0xFFFFFFFF));
- semaphore = CreateSemaphoreA(NULL, 1, 1, sem_name);
- if (semaphore == NULL) {
- usbi_err(ctx, "could not create semaphore: %s", windows_error_str(0));
- return LIBUSB_ERROR_NO_MEM;
- }
-
- // A successful wait brings our semaphore count to 0 (unsignaled)
- // => any concurent wait stalls until the semaphore's release
- if (WaitForSingleObject(semaphore, INFINITE) != WAIT_OBJECT_0) {
- usbi_err(ctx, "failure to access semaphore: %s", windows_error_str(0));
- CloseHandle(semaphore);
- return LIBUSB_ERROR_NO_MEM;
- }
-
- // 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?
- // Load DLL imports
- if (!windows_init_dlls()) {
- usbi_err(ctx, "could not resolve DLL functions");
- goto init_exit;
- }
-
- get_windows_version();
-
- if (windows_version == WINDOWS_UNDEFINED) {
- usbi_err(ctx, "failed to detect Windows version");
- r = LIBUSB_ERROR_NOT_SUPPORTED;
- goto init_exit;
- }
-
- if (!windows_init_clock(ctx))
- goto init_exit;
-
- if (!htab_create(ctx))
- goto init_exit;
-
- r = winusb_backend.init(ctx);
- if (r != LIBUSB_SUCCESS)
- goto init_exit;
- winusb_backend_init = true;
-
- r = usbdk_backend.init(ctx);
- if (r == LIBUSB_SUCCESS) {
- usbi_dbg("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_SUCCESS;
-
-init_exit: // Holds semaphore here
- if ((init_count == 1) && (r != LIBUSB_SUCCESS)) { // First init failed?
- if (winusb_backend_init)
- winusb_backend.exit(ctx);
- htab_destroy();
- windows_destroy_clock();
- windows_exit_dlls();
- --init_count;
- }
-
- ReleaseSemaphore(semaphore, 1, NULL); // increase count back to 1
- CloseHandle(semaphore);
- return r;
-}
-
-static void windows_exit(struct libusb_context *ctx)
-{
- HANDLE semaphore;
- char sem_name[11 + 8 + 1]; // strlen("libusb_init") + (32-bit hex PID) + '\0'
- UNUSED(ctx);
-
- sprintf(sem_name, "libusb_init%08X", (unsigned int)(GetCurrentProcessId() & 0xFFFFFFFF));
- semaphore = CreateSemaphoreA(NULL, 1, 1, sem_name);
- if (semaphore == NULL)
- return;
-
- // A successful wait brings our semaphore count to 0 (unsignaled)
- // => any concurent wait stalls until the semaphore release
- if (WaitForSingleObject(semaphore, INFINITE) != WAIT_OBJECT_0) {
- CloseHandle(semaphore);
- return;
- }
-
- // Only works if exits and inits are balanced exactly
- if (--init_count == 0) { // Last exit
- if (usbdk_available) {
- usbdk_backend.exit(ctx);
- usbdk_available = false;
- }
- winusb_backend.exit(ctx);
- htab_destroy();
- windows_destroy_clock();
- windows_exit_dlls();
- }
-
- ReleaseSemaphore(semaphore, 1, NULL); // increase count back to 1
- CloseHandle(semaphore);
-}
-
-static int windows_set_option(struct libusb_context *ctx, enum libusb_option option, va_list ap)
-{
- struct windows_context_priv *priv = _context_priv(ctx);
-
- UNUSED(ap);
-
- switch (option) {
- case LIBUSB_OPTION_USE_USBDK:
- if (usbdk_available) {
- usbi_dbg("switching context %p to use UsbDk backend", ctx);
- priv->backend = &usbdk_backend;
- } else {
- usbi_err(ctx, "UsbDk backend not available");
- return LIBUSB_ERROR_NOT_FOUND;
- }
- return LIBUSB_SUCCESS;
- default:
- return LIBUSB_ERROR_NOT_SUPPORTED;
- }
-
-}
-
-static int windows_get_device_list(struct libusb_context *ctx, struct discovered_devs **discdevs)
-{
- struct windows_context_priv *priv = _context_priv(ctx);
- return priv->backend->get_device_list(ctx, discdevs);
-}
-
-static int windows_open(struct libusb_device_handle *dev_handle)
-{
- struct windows_context_priv *priv = _context_priv(HANDLE_CTX(dev_handle));
- return priv->backend->open(dev_handle);
-}
-
-static void windows_close(struct libusb_device_handle *dev_handle)
-{
- struct windows_context_priv *priv = _context_priv(HANDLE_CTX(dev_handle));
- priv->backend->close(dev_handle);
-}
-
-static int windows_get_device_descriptor(struct libusb_device *dev,
- unsigned char *buffer, int *host_endian)
-{
- struct windows_context_priv *priv = _context_priv(DEVICE_CTX(dev));
- *host_endian = 0;
- return priv->backend->get_device_descriptor(dev, buffer);
-}
-
-static int windows_get_active_config_descriptor(struct libusb_device *dev,
- unsigned char *buffer, size_t len, int *host_endian)
-{
- struct windows_context_priv *priv = _context_priv(DEVICE_CTX(dev));
- *host_endian = 0;
- return priv->backend->get_active_config_descriptor(dev, buffer, len);
-}
-
-static int windows_get_config_descriptor(struct libusb_device *dev,
- uint8_t config_index, unsigned char *buffer, size_t len, int *host_endian)
-{
- struct windows_context_priv *priv = _context_priv(DEVICE_CTX(dev));
- *host_endian = 0;
- return priv->backend->get_config_descriptor(dev, config_index, buffer, len);
-}
-
-static int windows_get_config_descriptor_by_value(struct libusb_device *dev,
- uint8_t bConfigurationValue, unsigned char **buffer, int *host_endian)
-{
- struct windows_context_priv *priv = _context_priv(DEVICE_CTX(dev));
- *host_endian = 0;
- return priv->backend->get_config_descriptor_by_value(dev, bConfigurationValue, buffer);
-}
-
-static int windows_get_configuration(struct libusb_device_handle *dev_handle, int *config)
-{
- struct windows_context_priv *priv = _context_priv(HANDLE_CTX(dev_handle));
- return priv->backend->get_configuration(dev_handle, config);
-}
-
-static int windows_set_configuration(struct libusb_device_handle *dev_handle, int config)
-{
- struct windows_context_priv *priv = _context_priv(HANDLE_CTX(dev_handle));
- return priv->backend->set_configuration(dev_handle, config);
-}
-
-static int windows_claim_interface(struct libusb_device_handle *dev_handle, int interface_number)
-{
- struct windows_context_priv *priv = _context_priv(HANDLE_CTX(dev_handle));
- return priv->backend->claim_interface(dev_handle, interface_number);
-}
-
-static int windows_release_interface(struct libusb_device_handle *dev_handle, int interface_number)
-{
- struct windows_context_priv *priv = _context_priv(HANDLE_CTX(dev_handle));
- return priv->backend->release_interface(dev_handle, interface_number);
-}
-
-static int windows_set_interface_altsetting(struct libusb_device_handle *dev_handle,
- int interface_number, int altsetting)
-{
- struct windows_context_priv *priv = _context_priv(HANDLE_CTX(dev_handle));
- return priv->backend->set_interface_altsetting(dev_handle, interface_number, altsetting);
-}
-
-static int windows_clear_halt(struct libusb_device_handle *dev_handle, unsigned char endpoint)
-{
- struct windows_context_priv *priv = _context_priv(HANDLE_CTX(dev_handle));
- return priv->backend->clear_halt(dev_handle, endpoint);
-}
-
-static int windows_reset_device(struct libusb_device_handle *dev_handle)
-{
- struct windows_context_priv *priv = _context_priv(HANDLE_CTX(dev_handle));
- return priv->backend->reset_device(dev_handle);
-}
-
-static void windows_destroy_device(struct libusb_device *dev)
-{
- struct windows_context_priv *priv = _context_priv(DEVICE_CTX(dev));
- priv->backend->destroy_device(dev);
-}
-
-static int windows_submit_transfer(struct usbi_transfer *itransfer)
-{
- struct windows_context_priv *priv = _context_priv(ITRANSFER_CTX(itransfer));
- return priv->backend->submit_transfer(itransfer);
-}
-
-static int windows_cancel_transfer(struct usbi_transfer *itransfer)
-{
- struct windows_context_priv *priv = _context_priv(ITRANSFER_CTX(itransfer));
- return priv->backend->cancel_transfer(itransfer);
-}
-
-static void windows_clear_transfer_priv(struct usbi_transfer *itransfer)
-{
- struct windows_context_priv *priv = _context_priv(ITRANSFER_CTX(itransfer));
- priv->backend->clear_transfer_priv(itransfer);
-}
-
-static int windows_handle_events(struct libusb_context *ctx, struct pollfd *fds, POLL_NFDS_TYPE nfds, int num_ready)
-{
- struct windows_context_priv *priv = _context_priv(ctx);
- struct usbi_transfer *itransfer;
- DWORD io_size, io_result;
- POLL_NFDS_TYPE i;
- bool found;
- int transfer_fd;
- 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--;
-
- // Because a Windows OVERLAPPED is used for poll emulation,
- // a pollable fd is created and stored with each transfer
- found = false;
- transfer_fd = -1;
- usbi_mutex_lock(&ctx->flying_transfers_lock);
- list_for_each_entry(itransfer, &ctx->flying_transfers, list, struct usbi_transfer) {
- transfer_fd = priv->backend->get_transfer_fd(itransfer);
- if (transfer_fd == fds[i].fd) {
- found = true;
- break;
- }
- }
- usbi_mutex_unlock(&ctx->flying_transfers_lock);
-
- if (found) {
- priv->backend->get_overlapped_result(itransfer, &io_result, &io_size);
-
- usbi_remove_pollfd(ctx, transfer_fd);
-
- // let handle_callback free the event using the transfer wfd
- // If you don't use the transfer wfd, you run a risk of trying to free a
- // newly allocated wfd that took the place of the one from the transfer.
- windows_handle_callback(priv->backend, itransfer, io_result, io_size);
- } else {
- usbi_err(ctx, "could not find a matching transfer for fd %d", fds[i].fd);
- r = LIBUSB_ERROR_NOT_FOUND;
- break;
- }
- }
- usbi_mutex_unlock(&ctx->open_devs_lock);
-
- return r;
-}
-
-static int windows_clock_gettime(int clk_id, struct timespec *tp)
-{
- struct timer_request request;
-#if !defined(_MSC_VER) || (_MSC_VER < 1900)
- FILETIME filetime;
- ULARGE_INTEGER rtime;
-#endif
- DWORD r;
-
- switch (clk_id) {
- case USBI_CLOCK_MONOTONIC:
- if (timer_thread) {
- request.tp = tp;
- request.event = CreateEvent(NULL, FALSE, FALSE, NULL);
- if (request.event == NULL)
- return LIBUSB_ERROR_NO_MEM;
-
- if (!pPostThreadMessageA(timer_thread_id, WM_TIMER_REQUEST, 0, (LPARAM)&request)) {
- usbi_err(NULL, "PostThreadMessage failed for timer thread: %s", windows_error_str(0));
- CloseHandle(request.event);
- return LIBUSB_ERROR_OTHER;
- }
-
- do {
- r = WaitForSingleObject(request.event, TIMER_REQUEST_RETRY_MS);
- if (r == WAIT_TIMEOUT)
- usbi_dbg("could not obtain a timer value within reasonable timeframe - too much load?");
- else if (r == WAIT_FAILED)
- usbi_err(NULL, "WaitForSingleObject failed: %s", windows_error_str(0));
- } while (r == WAIT_TIMEOUT);
- CloseHandle(request.event);
-
- if (r == WAIT_OBJECT_0)
- return LIBUSB_SUCCESS;
- else
- return LIBUSB_ERROR_OTHER;
- }
- // Fall through and return real-time if monotonic was not detected @ timer init
- case USBI_CLOCK_REALTIME:
-#if defined(_MSC_VER) && (_MSC_VER >= 1900)
- timespec_get(tp, TIME_UTC);
-#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 LIBUSB_SUCCESS;
- default:
- return LIBUSB_ERROR_INVALID_PARAM;
- }
-}
-
-// NB: MSVC6 does not support named initializers.
-const struct usbi_os_backend usbi_backend = {
- "Windows",
- USBI_CAP_HAS_HID_ACCESS,
- windows_init,
- windows_exit,
- windows_set_option,
- windows_get_device_list,
- NULL, /* hotplug_poll */
- windows_open,
- windows_close,
- windows_get_device_descriptor,
- windows_get_active_config_descriptor,
- windows_get_config_descriptor,
- windows_get_config_descriptor_by_value,
- windows_get_configuration,
- windows_set_configuration,
- windows_claim_interface,
- windows_release_interface,
- windows_set_interface_altsetting,
- windows_clear_halt,
- windows_reset_device,
- NULL, /* alloc_streams */
- NULL, /* free_streams */
- NULL, /* dev_mem_alloc */
- NULL, /* dev_mem_free */
- NULL, /* kernel_driver_active */
- NULL, /* detach_kernel_driver */
- NULL, /* attach_kernel_driver */
- windows_destroy_device,
- windows_submit_transfer,
- windows_cancel_transfer,
- windows_clear_transfer_priv,
- windows_handle_events,
- NULL, /* handle_transfer_completion */
- windows_clock_gettime,
- sizeof(struct windows_context_priv),
- sizeof(union windows_device_priv),
- sizeof(union windows_device_handle_priv),
- sizeof(union windows_transfer_priv),
-};
projects / rtmpclient.git / blobdiff