Re: [spice-gtk 7/9] Implements set_keyboard_lock_modifiers for Windows

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----- Original Message -----
> Signed-off-by: Frediano Ziglio <fziglio@xxxxxxxxxx>
> ---
>  src/keyboard-modifiers.c | 534
>  +++++++++++++++++++++++++++++++++++++++++++++++
>  tests/Makefile.am        |  15 ++
>  tests/keyboard-test.c    |   9 +
>  3 files changed, 558 insertions(+)
>  create mode 100644 tests/keyboard-test.c
> 
> diff --git a/src/keyboard-modifiers.c b/src/keyboard-modifiers.c
> index dd13fad..cb019c9 100644
> --- a/src/keyboard-modifiers.c
> +++ b/src/keyboard-modifiers.c
> @@ -17,6 +17,8 @@
>  */
>  #include "config.h"
>  
> +#include <glib.h>
> +
>  #ifdef HAVE_X11_XKBLIB_H
>  #include <X11/XKBlib.h>
>  #include <gdk/gdkx.h>
> @@ -35,6 +37,7 @@
>  #include "channel-inputs.h"
>  #include "keyboard-modifiers.h"
>  
> +#if !KEYBOARD_MODIFIERS_TEST
>  guint32 get_keyboard_lock_modifiers(void)
>  {
>      guint32 modifiers = 0;
> @@ -89,6 +92,7 @@ guint32 get_keyboard_lock_modifiers(void)
>  #endif // GTK_CHECK_VERSION(3,18,0)
>      return modifiers;
>  }
> +#endif
>  
>  #if defined(HAVE_X11_XKBLIB_H)
>  typedef enum SpiceLed {
> @@ -158,6 +162,536 @@ void set_keyboard_lock_modifiers(guint32 modifiers)
>      set_keyboard_led(x_display, SCROLL_LOCK_LED, !!(modifiers &
>      SPICE_INPUTS_SCROLL_LOCK));
>  }
>  
> +#elif defined(G_OS_WIN32)
> +
> +// Some definitions from kbd.h to define internal layout file structures
> +// Note that pointer in Wow64 are 64 bit despite program bits
> +#define KBDSPECIAL (USHORT)0x0400
> +
> +// type of NLS function key
> +#define KBDNLS_TYPE_NULL      0
> +#define KBDNLS_TYPE_NORMAL    1
> +#define KBDNLS_TYPE_TOGGLE    2
> +
> +// action to perform on a specific combination (only needed)
> +#define KBDNLS_NULL             0 // Invalid function
> +#define KBDNLS_SEND_BASE_VK     2 // Send Base VK_xxx
> +#define KBDNLS_SEND_PARAM_VK    3 // Send Parameter VK_xxx
> +
> +typedef struct {
> +    BYTE  NLSFEProcIndex;
> +    ULONG NLSFEProcParam;
> +} VK_FPARAM;
> +
> +typedef struct {
> +    BYTE Vk;
> +    BYTE NLSFEProcType;
> +    BYTE NLSFEProcCurrent;
> +    BYTE NLSFEProcSwitch;   // 8 bits
> +    VK_FPARAM NLSFEProc[8];
> +    VK_FPARAM NLSFEProcAlt[8];
> +} VK_F;
> +
> +typedef struct {
> +    USHORT OEMIdentifier;
> +    USHORT LayoutInformation;
> +    UINT  NumOfVkToF;
> +    VK_F *pVkToF;
> +    void *dummy; // used to check size
> +} KBDNLSTABLES;
> +
> +typedef void *WINAPI KbdLayerDescriptor_t(void);
> +typedef BOOL WINAPI KbdLayerRealDllFile_t(HKL hkl, WCHAR *realDllName,
> LPVOID pClientKbdType, LPVOID reserve1 , LPVOID reserve2);
> +typedef KBDNLSTABLES *WINAPI KbdNlsLayerDescriptor_t(void);
> +
> +// where all keyboard layouts information are in the registry
> +#define LAYOUT_REGKEY "SYSTEM\\CurrentControlSet\\Control\\Keyboard Layouts"
> +
> +static LONG reg_read_str(HKEY key, LPCWSTR name, WCHAR *value, size_t len);
> +static HMODULE load_keyboard_layout(const WCHAR *dll_name);
> +static void keyboard_cache(HKL layout);
> +
> +#define test_debug(fmt, ...) do { \
> +    if (0) printf(fmt "\n", ## __VA_ARGS__); \
> +} while(0)
> +
> +#if KEYBOARD_MODIFIERS_TEST
> +
> +#define fatal(fmt, ...) do { fprintf(stderr, fmt "\n", ## __VA_ARGS__);
> exit(1); } while(0)
> +
> +#undef test_debug
> +#define test_debug(fmt, ...) printf(fmt "\n", ## __VA_ARGS__)
> +
> +// this allow to avoid having to link gtk libraries
> +#undef g_critical
> +#define g_critical fatal
> +
> +static void keyboard_check_single(HKEY key, const char *name);
> +
> +// must be tested on
> +// - WinXP 32
> +// - Win7 32/64 app
> +// - Win10 32/64 app
> +void keyboard_modifiers_test(void)
> +{
> +    setbuf(stdout, NULL);
> +    setbuf(stderr, NULL);
> +
> +    // scan all keyboards
> +    // HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Keyboard
> Layouts\<00030402>
> +    // check them all
> +    HKEY key;
> +    LONG err;
> +    err = RegOpenKeyEx(HKEY_LOCAL_MACHINE, LAYOUT_REGKEY, 0, KEY_READ,
> &key);
> +    if (err != ERROR_SUCCESS) {
> +        fatal("RegOpenKeyEx error %ld", err);
> +        return;
> +    }
> +
> +    unsigned i;
> +    for (i = 0; ; ++i) {
> +        char name[64];
> +        err = RegEnumKey(key, i, name, G_N_ELEMENTS(name));
> +        if (err == ERROR_NO_MORE_ITEMS)
> +            break;
> +        if (err != ERROR_SUCCESS) {
> +            fatal("RegEnumKey error %ld", err);
> +            break;
> +        }
> +        keyboard_check_single(key, name);
> +    }
> +
> +    RegCloseKey(key);
> +    // check for multiple keyboards
> +    //
> +    // KbdLayerDescriptor - no parameter, returns a table
> +    // KbdLayerMultiDescriptor
> +    //   pass a pointer, structure like, output
> +    //   struct Xxx {
> +    //      uint32_t num_layout_valid;
> +    //      struct {
> +    //          WCHAR dll_name[32];
> +    //          uint32_t unknown1;
> +    //          uint32_t unknown2;
> +    //      } layers[8];
> +    //   }
> +    // KbdLayerRealDllFile
> +    //   BOOL KbdLayerRealDllFile(HKL hkl, WCHAR *realDllName,
> PCLIENTKEYBOARDTYPE pClientKbdType, LPVOID reserve)
> +    //   returns TRUE if we need to load another file (this is just a stub)
> +    //   realDllName returned keyboard name
> +    //   pClientKbdType used for terminal server, NULL for physical one
> +    //   reserve NULL
> +    // KbdLayerRealDllFileNT4 - obsolete
> +    // KbdNlsLayerDescriptor - no parameter, returns NLS table, if not no
> need to parse but MapVirtualKey works
> +    //
> +}
> +
> +static void keyboard_check_single(HKEY key, const char *name)
> +{
> +    char *end = NULL;
> +    errno = 0;
> +    unsigned long num = strtoul(name, &end, 16);
> +    if (errno || *end) {
> +        fatal("wrong value %s", name);
> +        return;
> +    }
> +
> +    printf("trying keyboard %s\n", name);
> +    keyboard_cache((HKL) (DWORD_PTR) num);
> +    printf("----\n");
> +}
> +#endif
> +
> +/**
> + * Read a string from registry
> + * @param key registry key to read from
> + * @param name name of the value to read
> + * @param value buffer where to store results
> + * @param size size of value buffer in bytes (not value elements!)
> + * @returns system error code or ERROR_SUCCESS
> + */
> +static LONG reg_read_str(HKEY key, LPCWSTR name, WCHAR *value, size_t len)
> +{
> +    DWORD size = len-sizeof(*value), type;
> +    LONG err = RegQueryValueExW(key, name, 0, &type, (void *) value, &size);
> +    if (err != ERROR_SUCCESS)
> +        return err;
> +
> +    if (type != REG_SZ)
> +        return ERROR_INVALID_DATA;
> +
> +    // assure terminated
> +    value[size/sizeof(*value)] = 0;
> +    return ERROR_SUCCESS;
> +}
> +
> +/**
> + * Load a keyboard layout file given the file name
> + * @param dll_name dll name (should be just file name without paths)
> + */
> +static HMODULE load_keyboard_layout(const WCHAR *dll_name)
> +{
> +    WCHAR fn[MAX_PATH+256];
> +
> +#ifdef _WIN64
> +    GetSystemDirectoryW(fn, MAX_PATH);
> +#else
> +    typedef UINT WINAPI GetSystemWow64DirectoryW_t(LPWSTR str, UINT size);
> +    GetSystemWow64DirectoryW_t *pGetSystemWow64DirectoryW =
> +
> (GetSystemWow64DirectoryW_t*)GetProcAddress(GetModuleHandle("kernel32"),
> "GetSystemWow64DirectoryW");
> +    if (!pGetSystemWow64DirectoryW || pGetSystemWow64DirectoryW(fn,
> MAX_PATH) == 0)
> +        GetSystemDirectoryW(fn, MAX_PATH);
> +#endif
> +    wcscat(fn, L"\\");
> +    wcscat(fn, dll_name);
> +
> +    test_debug("loading file %S", fn);
> +    return LoadLibraryW(fn);
> +}
> +
> +/**
> + * Check if current process is running in Wow64 mode
> + * (32 bit on a 64 system)
> + */
> +#ifndef _WIN64
> +static BOOL is_wow64(void)
> +{
> +	BOOL bIsWow64 = FALSE;
> +
> +    typedef BOOL WINAPI IsWow64Process_t(HANDLE, PBOOL);
> +	IsWow64Process_t *pIsWow64Process =
> +		(IsWow64Process_t *) GetProcAddress(GetModuleHandle("kernel32"),
> "IsWow64Process");
> +
> +	if (pIsWow64Process)
> +		pIsWow64Process(GetCurrentProcess(), &bIsWow64);
> +
> +	return bIsWow64;
> +}
> +#else
> +static inline BOOL is_wow64(void)
> +{
> +    return FALSE;
> +}
> +#endif
> +
> +/**
> + * Check if OS is 64 bit
> + */
> +static BOOL os_is_64bit(void)
> +{
> +#ifdef _WIN64
> +	return TRUE;
> +#else
> +	return is_wow64() != FALSE;
> +#endif
> +}
> +
> +
> +// keyboard status
> +// caps lock VK/SC
> +// combination (ctrl+alt+shift / none)
> +// ctrl/alt/shift keys VK/SC (2 for each) ?
> +static WORD vsc_capital = 58;
> +static int specific_modifiers = -1;
> +
> +/**
> + * Extract information from keyboard.
> + * Currently scancode of Caps Lock is searched and
> + * possible modifiers needed to have that Caps Lock.
> + * @param layout layout to get information
> + */
> +static void keyboard_cache(HKL layout)
> +{
> +    WCHAR buf[256];
> +    HKEY key;
> +    LONG err;
> +
> +    KbdLayerDescriptor_t *get_desc;
> +
> +    const BYTE *kbd_table;
> +    int num_keys, i;
> +    const USHORT *keys;
> +    const KBDNLSTABLES *nls_table;
> +    const VK_F *vkf, *vkf_end;
> +
> +    // set default output, usually work with lot of keyboard layout
> +    // these values will be used in case of errors
> +    vsc_capital = MapVirtualKey(VK_CAPITAL, MAPVK_VK_TO_VSC);
> +    specific_modifiers = -1;
> +
> +    // get keyboard dll name from registry
> +    swprintf(buf, 256, TEXT(LAYOUT_REGKEY) L"\\%08X",
> (unsigned)(DWORD_PTR)layout);
> +    err = RegOpenKeyExW(HKEY_LOCAL_MACHINE, buf, 0, KEY_READ, &key);
> +    if (err != ERROR_SUCCESS) {
> +        g_critical("failed getting keyboard layout registry key");
> +        return;
> +    }
> +    err = reg_read_str(key, L"Layout File", buf, sizeof(buf));
> +    RegCloseKey(key);
> +    if (err != ERROR_SUCCESS) {
> +        g_critical("failed getting keyboard layout file name");
> +        return;
> +    }
> +
> +    // load keyboard layout file
> +    HMODULE dll = load_keyboard_layout(buf);
> +    if (!dll) {
> +        g_critical("error loading keyboard layout for %08x",
> (unsigned)(DWORD_PTR)layout);
> +        return;
> +    }
> +
> +    // see if we need to get another dll
> +    KbdLayerRealDllFile_t *dll_file = (KbdLayerRealDllFile_t *)
> GetProcAddress(dll, "KbdLayerRealDllFile");
> +    if (dll_file) {
> +        // load the other file
> +        if (dll_file(layout, buf, NULL, NULL, NULL)) {
> +            test_debug("dll redirected to %S %u", buf, (unsigned)
> wcslen(buf));
> +            HMODULE new_dll = load_keyboard_layout(buf);
> +            if (new_dll) {
> +                test_debug("unloading stub");
> +                FreeLibrary(dll);
> +                dll = new_dll;
> +            }
> +        }
> +    }
> +
> +    // check if there are NLS function (in this case we must parse tables)
> +    KbdNlsLayerDescriptor_t *get_nls_desc = (KbdNlsLayerDescriptor_t *)
> GetProcAddress(dll, "KbdNlsLayerDescriptor");
> +    if (!get_nls_desc)
> +        goto cleanup;
> +
> +    // get main keyboard table
> +    get_desc = (KbdLayerDescriptor_t *) GetProcAddress(dll,
> "KbdLayerDescriptor");
> +    if (!get_desc) {
> +        g_critical("keyboard dll layout has no descriptor");
> +        goto cleanup;
> +    }
> +    kbd_table = (BYTE *) get_desc();
> +
> +    // check table (for Win32 see format 32 or 64)
> +    if (os_is_64bit()) {
> +        test_debug("64 bit");
> +        if (IsBadReadPtr(kbd_table, 12*8)) {
> +            g_critical("wrong table address");
> +            goto cleanup;
> +        }
> +        keys = *((USHORT **) &kbd_table[6*8]);
> +        num_keys = kbd_table[7*8];
> +    } else {
> +        test_debug("32 bit");
> +        if (IsBadReadPtr(kbd_table, 13*4)) {
> +            g_critical("wrong table address");
> +            goto cleanup;
> +        }
> +        keys = *((USHORT **) &kbd_table[6*4]);
> +        num_keys = kbd_table[7*4];
> +    }
> +
> +    // scan VKs for a VK_CAPITAL not special
> +    if (IsBadReadPtr(keys, num_keys*sizeof(*keys))) {
> +        g_critical("wrong VKs table");
> +        goto cleanup;
> +    }
> +    for (i = 0; i < num_keys; ++i) {
> +        // ... return if found
> +        if ((keys[i] & KBDSPECIAL) == 0 && (keys[i] & 0xFF) == VK_CAPITAL) {
> +            vsc_capital = i;
> +            specific_modifiers = -1;
> +            goto cleanup;
> +        }
> +    }
> +
> +    // scan NLS table for VK_CAPITALs
> +    nls_table = get_nls_desc();
> +    if (IsBadReadPtr(keys, sizeof(*nls_table))) {
> +        g_critical("wrong NLS table");
> +        goto cleanup;
> +    }
> +    vkf = nls_table->pVkToF;
> +    if (IsBadReadPtr(vkf, sizeof(*vkf) * nls_table->NumOfVkToF)) {
> +        g_critical("wrong function table");
> +        goto cleanup;
> +    }
> +    test_debug("layout has %u NLS key", (unsigned) nls_table->NumOfVkToF);
> +    vkf_end = vkf + nls_table->NumOfVkToF;
> +    for (; vkf < vkf_end; ++vkf) {
> +        unsigned mask = 0;
> +        const VK_FPARAM *params = vkf->NLSFEProc;
> +
> +        // scan all functions searching for VK_CAPITAL
> +        // check both part, normal and with alternate (if present)
> +        for (i = 0; i < 16; ++i) {
> +            if ((vkf->Vk == VK_CAPITAL && params[i].NLSFEProcIndex ==
> KBDNLS_SEND_BASE_VK)
> +                || (params[i].NLSFEProcIndex == KBDNLS_SEND_PARAM_VK &&
> params[i].NLSFEProcParam == VK_CAPITAL))
> +                mask |= 1<<i;
> +        }
> +        // no VK_CAPITAL found
> +        if (!mask)
> +            continue;
> +        test_debug("found mask %x at vk %x", mask, vkf->Vk);
> +        // see if there are a common key between the two tables for
> +        // each special key
> +        unsigned common = (mask >> 8) & mask;
> +        if (common)
> +            mask = common;
> +        for (i = 0; i < 16; ++i)
> +            if (mask & (1<<i)) {
> +                specific_modifiers = i & 7;
> +                break;
> +            }
> +        // get back base VK
> +        for (i = 0; i < num_keys; ++i) {
> +            // ... return if found
> +            test_debug("keys %d = %x vk %x", i, keys[i], vkf->Vk);
> +            if ((keys[i] & KBDSPECIAL) != 0 && (keys[i] & 0xFF) == vkf->Vk)
> {
> +                vsc_capital = i;
> +                goto cleanup;
> +            }
> +        }
> +        // this is unexpected, there should be a key matching the NLS table
> +        g_critical("NLS key not found in normal table");
> +    }
> +    specific_modifiers = -1;
> +
> +cleanup:
> +    test_debug("unloading dll");
> +    FreeLibrary(dll);
> +}
> +
> +/**
> + * Add input keys in order to make the special key (shift/control/alt)
> + * state the same as wanted one.
> + * @param vk virtual key of the key
> + * @param curr_state current state (!=0 is key down)
> + * @param wanted_state wanted state (!=0 is key down)
> + * @param begin_inputs beginning of already present input keys
> + * @param end_inputs end of already present input keys
> + */
> +static void adjust_special(WORD vk, int curr_state, int wanted_state,
> +                           INPUT **begin_inputs, INPUT **end_inputs)
> +{
> +    KEYBDINPUT *ki;
> +
> +    curr_state &= 0x80;
> +    if (!!wanted_state == !!curr_state)
> +        return;
> +
> +    // if there are not the spcific key no need to handle
> +    UINT vsc = MapVirtualKey(vk, MAPVK_VK_TO_VSC);
> +    if (!vsc)
> +        return;
> +
> +    // make sure modifier key is in the right state before pressing
> +    // main key
> +    --(*begin_inputs);
> +    ki = &(*begin_inputs)->ki;
> +    ki->wVk = vk;
> +    ki->wScan = vsc;
> +    ki->dwFlags = wanted_state ? 0 : KEYEVENTF_KEYUP;
> +
> +    // make sure key state is restored at the end
> +    ki = &(*end_inputs)->ki;
> +    ki->wVk = vk;
> +    ki->wScan = vsc;
> +    ki->dwFlags = wanted_state ? KEYEVENTF_KEYUP : 0;
> +    ++(*end_inputs);
> +}
> +
> +/**
> + * Add a key pression and a release to inputs events
> + */
> +static gboolean add_press_release(INPUT *inputs, WORD vk, WORD vsc)
> +{
> +    KEYBDINPUT *ki;
> +
> +    if (!vsc)
> +        return FALSE;
> +
> +    ki = &inputs[0].ki;
> +    ki->wVk = vk;
> +    ki->wScan = vsc;
> +    ki = &inputs[1].ki;
> +    ki->wVk = vk;
> +    ki->wScan = vsc;
> +    ki->dwFlags = KEYEVENTF_KEYUP;
> +
> +    return TRUE;
> +}
> +
> +void set_keyboard_lock_modifiers(guint32 modifiers)
> +{
> +    static HKL cached_layout = 0;
> +
> +    // get keyboard layout
> +    HKL curr_layout = GetKeyboardLayout(0);
> +
> +    // same as before, use old informations..
> +    if (curr_layout != cached_layout) {
> +        // .. otherwise cache new keyboard layout
> +        keyboard_cache(curr_layout);
> +        cached_layout = curr_layout;
> +    }
> +
> +    BYTE key_states[256];
> +    GetKeyboardState(key_states);
> +
> +    // compute sequence to press
> +    // as documented in SetKeyboardState we must press
> +    // the sequence that cause the state to change
> +    // to modify the global state
> +    int i;
> +    INPUT inputs[6*2+2+4], *begin_inputs, *end_inputs;
> +    memset(inputs, 0, sizeof(inputs));
> +    for (i = 0; i < G_N_ELEMENTS(inputs); ++i) {
> +        inputs[i].type = INPUT_KEYBOARD;
> +        inputs[i].ki.dwExtraInfo = 0x12345678;
> +    }
> +
> +    // start pointers, make sure we have enough space
> +    // before and after to insert shift/control/alt keys
> +    begin_inputs = end_inputs = inputs + 6;
> +
> +    // we surely must press the caps lock key
> +    if ((!!(modifiers & SPICE_INPUTS_CAPS_LOCK) != !!(key_states[VK_CAPITAL]
> & 0x80))
> +        && add_press_release(end_inputs, VK_CAPITAL, vsc_capital)) {
> +        end_inputs += 2;
> +
> +        // unfortunately the key expect a specific combination
> +        // of shift/control/alt, make sure we have that state
> +        if (specific_modifiers >= 0) {
> +
> +#define adjust_special(vk, mask)  \
> +    adjust_special((vk), key_states[vk], specific_modifiers & (mask),
> &begin_inputs, &end_inputs)
> +
> +            adjust_special(VK_LSHIFT, 1);
> +            adjust_special(VK_RSHIFT, 1);
> +            adjust_special(VK_LCONTROL, 2);
> +            adjust_special(VK_RCONTROL, 2);
> +            adjust_special(VK_LMENU, 4);
> +            adjust_special(VK_RMENU, 4);
> +        }
> +    }
> +
> +    // sync NUMLOCK
> +    if ((!!(modifiers & SPICE_INPUTS_NUM_LOCK) != !!(key_states[VK_NUMLOCK]
> & 0x80))
> +        && add_press_release(end_inputs, VK_NUMLOCK,
> MapVirtualKey(VK_NUMLOCK, MAPVK_VK_TO_VSC))) {
> +        end_inputs += 2;
> +    }
> +
> +    // sync SCROLLLOCK
> +    if ((!!(modifiers & SPICE_INPUTS_SCROLL_LOCK) !=
> !!(key_states[VK_SCROLL] & 0x80))
> +        && add_press_release(end_inputs, VK_SCROLL, MapVirtualKey(VK_SCROLL,
> MAPVK_VK_TO_VSC))) {
> +        end_inputs += 2;
> +    }
> +
> +    // press the sequence
> +    if (end_inputs > begin_inputs) {
> +        BlockInput(TRUE);
> +        SendInput(end_inputs - begin_inputs, begin_inputs,
> sizeof(inputs[0]));
> +        BlockInput(FALSE);
> +    }
> +}
> +
>  #else
>  
>  void set_keyboard_lock_modifiers(guint32 modifiers)
> diff --git a/tests/Makefile.am b/tests/Makefile.am
> index 1a8b768..f96ee48 100644
> --- a/tests/Makefile.am
> +++ b/tests/Makefile.am
> @@ -16,6 +16,21 @@ TESTS += usb-acl-helper
>  noinst_PROGRAMS += mock-acl-helper
>  endif
>  
> +if OS_WIN32
> +TESTS += keyboard-test
> +keyboard_test_SOURCES = \
> +	keyboard-test.c \
> +	$(NULL)
> +keyboard_test_CPPFLAGS = \
> +	$(COMMON_CFLAGS)			\
> +	-DSPICE_COMPILATION					\
> +	$(GTK_CFLAGS)						\
> +	-DG_LOG_DOMAIN=\"GSpice\"		\
> +	$(NULL)
> +keyboard_test_LDADD = \
> +	$(GTK_LIBS)			\
> +	$(NULL)
> +endif
>  noinst_PROGRAMS += $(TESTS)
>  
>  AM_CPPFLAGS =					\
> diff --git a/tests/keyboard-test.c b/tests/keyboard-test.c
> new file mode 100644
> index 0000000..9c7dfba
> --- /dev/null
> +++ b/tests/keyboard-test.c
> @@ -0,0 +1,9 @@
> +#define KEYBOARD_MODIFIERS_TEST 1
> +
> +#include "../src/keyboard-modifiers.c"

I would rather not include the C file, but have the test code in this file (like the rest of the tests)

> +
> +int main(void)
> +{
> +    keyboard_modifiers_test();
> +    return 0;
> +}
> --
> 2.7.4
> 
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