Disable USB features for win32

Currently, there is an issue with the libusb prebuilt dll.

Refs libusb/#1049 <https://github.com/libusb/libusb/issues/1049>
PR #3011 <https://github.com/Genymobile/scrcpy/pull/3011>

BUILD.md

@@ -161,7 +161,8 @@ install the required packages:
 ```bash
 # runtime dependencies
 pacman -S mingw-w64-x86_64-SDL2 \
-          mingw-w64-x86_64-ffmpeg
+          mingw-w64-x86_64-ffmpeg \
+          mingw-w64-x86_64-libusb
 
 # client build dependencies
 pacman -S mingw-w64-x86_64-make \
@@ -175,7 +176,8 @@ For a 32 bits version, replace `x86_64` by `i686`:
 ```bash
 # runtime dependencies
 pacman -S mingw-w64-i686-SDL2 \
-          mingw-w64-i686-ffmpeg
+          mingw-w64-i686-ffmpeg \
+          mingw-w64-i686-libusb
 
 # client build dependencies
 pacman -S mingw-w64-i686-make \
@@ -199,7 +201,7 @@ Install the packages with [Homebrew]:
 
 ```bash
 # runtime dependencies
-brew install sdl2 ffmpeg
+brew install sdl2 ffmpeg libusb
 
 # client build dependencies
 brew install pkg-config meson

app/meson.build

@@ -74,7 +74,7 @@ if v4l2_support
     src += [ 'src/v4l2_sink.c' ]
 endif
 
-usb_support = get_option('usb') and host_machine.system() == 'linux'
+usb_support = get_option('usb')
 if usb_support
     src += [
         'src/usb/aoa_hid.c',
@@ -141,9 +141,22 @@ else
         include_directories: include_directories(ffmpeg_include_dir)
     )
 
+    prebuilt_libusb = meson.get_cross_property('prebuilt_libusb')
+    prebuilt_libusb_root = meson.get_cross_property('prebuilt_libusb_root')
+    libusb_bin_dir = meson.current_source_dir() + '/prebuilt-deps/data/' + prebuilt_libusb + '/dll'
+    libusb_include_dir = 'prebuilt-deps/data/' + prebuilt_libusb_root + '/include'
+
+    libusb = declare_dependency(
+        dependencies: [
+            cc.find_library('libusb-1.0', dirs: libusb_bin_dir),
+        ],
+        include_directories: include_directories(libusb_include_dir)
+    )
+
     dependencies = [
         ffmpeg,
         sdl2,
+        libusb,
         cc.find_library('mingw32')
     ]
 

app/prebuilt-deps/prepare-libusb.sh

@@ -0,0 +1,28 @@
+#!/usr/bin/env bash
+set -e
+DIR=$(dirname ${BASH_SOURCE[0]})
+cd "$DIR"
+. common
+mkdir -p "$PREBUILT_DATA_DIR"
+cd "$PREBUILT_DATA_DIR"
+
+DEP_DIR=libusb-1.0.25
+
+FILENAME=libusb-1.0.25.7z
+SHA256SUM=3d1c98416f454026034b2b5d67f8a294053898cb70a8b489874e75b136c6674d
+
+if [[ -d "$DEP_DIR" ]]
+then
+    echo "$DEP_DIR" found
+    exit 0
+fi
+
+get_file "https://github.com/libusb/libusb/releases/download/v1.0.25/$FILENAME" "$FILENAME" "$SHA256SUM"
+
+mkdir "$DEP_DIR"
+cd "$DEP_DIR"
+
+7z x "../$FILENAME" \
+    MinGW32/dll/libusb-1.0.dll \
+    MinGW64/dll/libusb-1.0.dll \
+    include /

app/scrcpy.1

@@ -100,7 +100,7 @@ Simulate a physical keyboard by using HID over AOAv2.
 
 This provides a better experience for IME users, and allows to generate non-ASCII characters, contrary to the default injection method.
 
-It may only work over USB, and is currently only supported on Linux.
+It may only work over USB.
 
 The keyboard layout must be configured (once and for all) on the device, via Settings -> System -> Languages and input -> Physical keyboard. This settings page can be started directly:
 
@@ -142,7 +142,7 @@ In this mode, the computer mouse is captured to control the device directly (rel
 
 LAlt, LSuper or RSuper toggle the capture mode, to give control of the mouse back to the computer.
 
-It may only work over USB, and is currently only supported on Linux.
+It may only work over USB.
 
 Also see \fB\-\-hid\-keyboard\fR.
 
@@ -190,7 +190,7 @@ LAlt, LSuper or RSuper toggle the mouse capture mode, to give control of the mou
 
 If any of \fB\-\-hid\-keyboard\fR or \fB\-\-hid\-mouse\fR is set, only enable keyboard or mouse respectively, otherwise enable both.
 
-It may only work over USB, and is currently only supported on Linux.
+It may only work over USB.
 
 See \fB\-\-hid\-keyboard\fR and \fB\-\-hid\-mouse\fR.
 

app/src/adb/adb.c

@@ -150,7 +150,7 @@ process_check_success_internal(sc_pid pid, const char *name, bool close,
 static bool
 process_check_success_intr(struct sc_intr *intr, sc_pid pid, const char *name,
                            unsigned flags) {
-    if (!sc_intr_set_process(intr, pid)) {
+    if (intr && !sc_intr_set_process(intr, pid)) {
         // Already interrupted
         return false;
     }
@@ -158,7 +158,9 @@ process_check_success_intr(struct sc_intr *intr, sc_pid pid, const char *name,
     // Always pass close=false, interrupting would be racy otherwise
     bool ret = process_check_success_internal(pid, name, false, flags);
 
-    sc_intr_set_process(intr, SC_PROCESS_NONE);
+    if (intr) {
+        sc_intr_set_process(intr, SC_PROCESS_NONE);
+    }
 
     // Close separately
     sc_process_close(pid);
@@ -202,6 +204,14 @@ sc_adb_start_server(struct sc_intr *intr, unsigned flags) {
     return process_check_success_intr(intr, pid, "adb start-server", flags);
 }
 
+bool
+sc_adb_kill_server(struct sc_intr *intr, unsigned flags) {
+    const char *const argv[] = SC_ADB_COMMAND("kill-server");
+
+    sc_pid pid = sc_adb_execute(argv, flags);
+    return process_check_success_intr(intr, pid, "adb kill-server", flags);
+}
+
 bool
 sc_adb_forward(struct sc_intr *intr, const char *serial, uint16_t local_port,
                const char *device_socket_name, unsigned flags) {
@@ -412,7 +422,7 @@ sc_adb_list_devices(struct sc_intr *intr, unsigned flags,
         // The implementation assumes that the output of "adb devices -l" fits
         // in the buffer in a single pass
         LOGW("Result of \"adb devices -l\" does not fit in 4Kb. "
-             "Please report an issue.\n");
+             "Please report an issue.");
         return -1;
     }
 
@@ -676,7 +686,7 @@ sc_adb_get_device_ip(struct sc_intr *intr, const char *serial, unsigned flags) {
         // The implementation assumes that the output of "ip route" fits in the
         // buffer in a single pass
         LOGW("Result of \"ip route\" does not fit in 1Kb. "
-             "Please report an issue.\n");
+             "Please report an issue.");
         return NULL;
     }
 

app/src/adb/adb.h

@@ -36,6 +36,9 @@ sc_adb_execute(const char *const argv[], unsigned flags);
 bool
 sc_adb_start_server(struct sc_intr *intr, unsigned flags);
 
+bool
+sc_adb_kill_server(struct sc_intr *intr, unsigned flags);
+
 bool
 sc_adb_forward(struct sc_intr *intr, const char *serial, uint16_t local_port,
                const char *device_socket_name, unsigned flags);

app/src/cli.c

@@ -118,7 +118,7 @@ static const struct sc_option options[] = {
         .text = "Crop the device screen on the server.\n"
                 "The values are expressed in the device natural orientation "
                 "(typically, portrait for a phone, landscape for a tablet). "
-                "Any --max-size value is cmoputed on the cropped size.",
+                "Any --max-size value is computed on the cropped size.",
     },
     {
         .shortopt = 'd',
@@ -186,8 +186,7 @@ static const struct sc_option options[] = {
                 "It provides a better experience for IME users, and allows to "
                 "generate non-ASCII characters, contrary to the default "
                 "injection method.\n"
-                "It may only work over USB, and is currently only supported "
-                "on Linux.\n"
+                "It may only work over USB.\n"
                 "The keyboard layout must be configured (once and for all) on "
                 "the device, via Settings -> System -> Languages and input -> "
                 "Physical keyboard. This settings page can be started "
@@ -239,8 +238,7 @@ static const struct sc_option options[] = {
                 "device directly (relative mouse mode).\n"
                 "LAlt, LSuper or RSuper toggle the capture mode, to give "
                 "control of the mouse back to the computer.\n"
-                "It may only work over USB, and is currently only supported "
-                "on Linux.\n"
+                "It may only work over USB.\n"
                 "Also see --hid-keyboard.",
     },
     {
@@ -311,8 +309,7 @@ static const struct sc_option options[] = {
                 "control of the mouse back to the computer.\n"
                 "If any of --hid-keyboard or --hid-mouse is set, only enable "
                 "keyboard or mouse respectively, otherwise enable both.\n"
-                "It may only work over USB, and is currently only supported "
-                "on Linux.\n"
+                "It may only work over USB.\n"
                 "See --hid-keyboard and --hid-mouse.",
     },
     {
@@ -1373,8 +1370,7 @@ parse_args_with_getopt(struct scrcpy_cli_args *args, int argc, char *argv[],
                 opts->keyboard_input_mode = SC_KEYBOARD_INPUT_MODE_HID;
                 break;
 #else
-                LOGE("HID over AOA (-K/--hid-keyboard) is disabled (or "
-                     "unsupported on this platform).");
+                LOGE("HID over AOA (-K/--hid-keyboard) is disabled.");
                 return false;
 #endif
             case OPT_MAX_FPS:
@@ -1392,8 +1388,7 @@ parse_args_with_getopt(struct scrcpy_cli_args *args, int argc, char *argv[],
                 opts->mouse_input_mode = SC_MOUSE_INPUT_MODE_HID;
                 break;
 #else
-                LOGE("HID over AOA (-M/--hid-mouse) is disabled (or "
-                     "unsupported on this platform).");
+                LOGE("HID over AOA (-M/--hid-mouse) is disabled.");
                 return false;
 #endif
             case OPT_LOCK_VIDEO_ORIENTATION:
@@ -1562,8 +1557,7 @@ parse_args_with_getopt(struct scrcpy_cli_args *args, int argc, char *argv[],
                 opts->otg = true;
                 break;
 #else
-                LOGE("OTG mode (--otg) is disabled (or unsupported on this "
-                     "platform).");
+                LOGE("OTG mode (--otg) is disabled.");
                 return false;
 #endif
             case OPT_V4L2_SINK:
@@ -1686,6 +1680,18 @@ parse_args_with_getopt(struct scrcpy_cli_args *args, int argc, char *argv[],
     }
 
 #ifdef HAVE_USB
+
+# ifdef _WIN32
+    if (!opts->otg && (opts->keyboard_input_mode == SC_KEYBOARD_INPUT_MODE_HID
+                    || opts->mouse_input_mode == SC_MOUSE_INPUT_MODE_HID)) {
+        LOGE("On Windows, it is not possible to open a USB device already open "
+             "by another process (like adb).");
+        LOGE("Therefore, -K/--hid-keyboard and -M/--hid-mouse may only work in "
+             "OTG mode (--otg).");
+        return false;
+    }
+# endif
+
     if (opts->otg) {
         // OTG mode is compatible with only very few options.
         // Only report obvious errors.

app/src/screen.c

@@ -163,7 +163,27 @@ sc_screen_is_relative_mode(struct sc_screen *screen) {
 }
 
 static void
-sc_screen_set_mouse_capture(bool capture) {
+sc_screen_set_mouse_capture(struct sc_screen *screen, bool capture) {
+#ifdef __APPLE__
+    // Workaround for SDL bug on macOS:
+    // <https://github.com/libsdl-org/SDL/issues/5340>
+    if (capture) {
+        int mouse_x, mouse_y;
+        SDL_GetGlobalMouseState(&mouse_x, &mouse_y);
+
+        int x, y, w, h;
+        SDL_GetWindowPosition(screen->window, &x, &y);
+        SDL_GetWindowSize(screen->window, &w, &h);
+
+        bool outside_window = mouse_x < x || mouse_x >= x + w
+                           || mouse_y < y || mouse_y >= y + h;
+        if (outside_window) {
+            SDL_WarpMouseInWindow(screen->window, w / 2, h / 2);
+        }
+    }
+#else
+    (void) screen;
+#endif
     if (SDL_SetRelativeMouseMode(capture)) {
         LOGE("Could not set relative mouse mode to %s: %s",
              capture ? "true" : "false", SDL_GetError());
@@ -171,13 +191,16 @@ sc_screen_set_mouse_capture(bool capture) {
 }
 
 static inline bool
-sc_screen_get_mouse_capture(void) {
+sc_screen_get_mouse_capture(struct sc_screen *screen) {
+    (void) screen;
     return SDL_GetRelativeMouseMode();
 }
 
 static inline void
-sc_screen_toggle_mouse_capture(void) {
-    sc_screen_set_mouse_capture(!sc_screen_get_mouse_capture());
+sc_screen_toggle_mouse_capture(struct sc_screen *screen) {
+    (void) screen;
+    bool new_value = !sc_screen_get_mouse_capture(screen);
+    sc_screen_set_mouse_capture(screen, new_value);
 }
 
 static void
@@ -721,7 +744,7 @@ sc_screen_update_frame(struct sc_screen *screen) {
 
         if (sc_screen_is_relative_mode(screen)) {
             // Capture mouse on start
-            sc_screen_set_mouse_capture(true);
+            sc_screen_set_mouse_capture(screen, true);
         }
     }
 
@@ -834,7 +857,7 @@ sc_screen_handle_event(struct sc_screen *screen, SDL_Event *event) {
                     break;
                 case SDL_WINDOWEVENT_FOCUS_LOST:
                     if (relative_mode) {
-                        sc_screen_set_mouse_capture(false);
+                        sc_screen_set_mouse_capture(screen, false);
                     }
                     break;
             }
@@ -864,7 +887,7 @@ sc_screen_handle_event(struct sc_screen *screen, SDL_Event *event) {
                     if (key == cap) {
                         // A mouse capture key has been pressed then released:
                         // toggle the capture mouse mode
-                        sc_screen_toggle_mouse_capture();
+                        sc_screen_toggle_mouse_capture(screen);
                     }
                     // Mouse capture keys are never forwarded to the device
                     return;
@@ -874,7 +897,7 @@ sc_screen_handle_event(struct sc_screen *screen, SDL_Event *event) {
         case SDL_MOUSEWHEEL:
         case SDL_MOUSEMOTION:
         case SDL_MOUSEBUTTONDOWN:
-            if (relative_mode && !sc_screen_get_mouse_capture()) {
+            if (relative_mode && !sc_screen_get_mouse_capture(screen)) {
                 // Do not forward to input manager, the mouse will be captured
                 // on SDL_MOUSEBUTTONUP
                 return;
@@ -890,8 +913,8 @@ sc_screen_handle_event(struct sc_screen *screen, SDL_Event *event) {
             }
             break;
         case SDL_MOUSEBUTTONUP:
-            if (relative_mode && !sc_screen_get_mouse_capture()) {
-                sc_screen_set_mouse_capture(true);
+            if (relative_mode && !sc_screen_get_mouse_capture(screen)) {
+                sc_screen_set_mouse_capture(screen, true);
                 return;
             }
             break;

app/src/usb/aoa_hid.c

@@ -95,6 +95,7 @@ sc_aoa_register_hid(struct sc_aoa *aoa, uint16_t accessory_id,
                                          DEFAULT_TIMEOUT);
     if (result < 0) {
         LOGE("REGISTER_HID: libusb error: %s", libusb_strerror(result));
+        sc_usb_check_disconnected(aoa->usb, result);
         return false;
     }
 
@@ -131,6 +132,7 @@ sc_aoa_set_hid_report_desc(struct sc_aoa *aoa, uint16_t accessory_id,
                                          DEFAULT_TIMEOUT);
     if (result < 0) {
         LOGE("SET_HID_REPORT_DESC: libusb error: %s", libusb_strerror(result));
+        sc_usb_check_disconnected(aoa->usb, result);
         return false;
     }
 
@@ -173,6 +175,7 @@ sc_aoa_send_hid_event(struct sc_aoa *aoa, const struct sc_hid_event *event) {
                                          DEFAULT_TIMEOUT);
     if (result < 0) {
         LOGE("SEND_HID_EVENT: libusb error: %s", libusb_strerror(result));
+        sc_usb_check_disconnected(aoa->usb, result);
         return false;
     }
 
@@ -195,6 +198,7 @@ sc_aoa_unregister_hid(struct sc_aoa *aoa, const uint16_t accessory_id) {
                                          DEFAULT_TIMEOUT);
     if (result < 0) {
         LOGE("UNREGISTER_HID: libusb error: %s", libusb_strerror(result));
+        sc_usb_check_disconnected(aoa->usb, result);
         return false;
     }
 

app/src/usb/scrcpy_otg.c

@@ -2,6 +2,7 @@
 
 #include <SDL2/SDL.h>
 
+#include "adb/adb.h"
 #include "events.h"
 #include "screen_otg.h"
 #include "util/log.h"
@@ -75,6 +76,15 @@ scrcpy_otg(struct scrcpy_options *options) {
     bool aoa_started = false;
     bool aoa_initialized = false;
 
+#ifdef _WIN32
+    // On Windows, only one process could open a USB device
+    // <https://github.com/Genymobile/scrcpy/issues/2773>
+    LOGI("Killing adb daemon (if any)...");
+    unsigned flags = SC_ADB_NO_STDOUT | SC_ADB_NO_STDERR | SC_ADB_NO_LOGERR;
+    // uninterruptible (intr == NULL), but in practice it's very quick
+    sc_adb_kill_server(NULL, flags);
+#endif
+
     static const struct sc_usb_callbacks cbs = {
         .on_disconnected = sc_usb_on_disconnected,
     };
@@ -91,8 +101,8 @@ scrcpy_otg(struct scrcpy_options *options) {
 
     usb_device_initialized = true;
 
-    LOGI("USB device: %s (%04" PRIx16 ":%04" PRIx16 ") %s %s",
-         usb_device.serial, usb_device.vid, usb_device.pid,
+    LOGI("USB device: %s (%04x:%04x) %s %s", usb_device.serial,
+         (unsigned) usb_device.vid, (unsigned) usb_device.pid,
          usb_device.manufacturer, usb_device.product);
 
     ok = sc_usb_connect(&s->usb, usb_device.device, &cbs, NULL);

app/src/usb/screen_otg.c

@@ -5,7 +5,27 @@
 #include "util/log.h"
 
 static void
-sc_screen_otg_set_mouse_capture(bool capture) {
+sc_screen_otg_set_mouse_capture(struct sc_screen_otg *screen, bool capture) {
+#ifdef __APPLE__
+    // Workaround for SDL bug on macOS:
+    // <https://github.com/libsdl-org/SDL/issues/5340>
+    if (capture) {
+        int mouse_x, mouse_y;
+        SDL_GetGlobalMouseState(&mouse_x, &mouse_y);
+
+        int x, y, w, h;
+        SDL_GetWindowPosition(screen->window, &x, &y);
+        SDL_GetWindowSize(screen->window, &w, &h);
+
+        bool outside_window = mouse_x < x || mouse_x >= x + w
+                           || mouse_y < y || mouse_y >= y + h;
+        if (outside_window) {
+            SDL_WarpMouseInWindow(screen->window, w / 2, h / 2);
+        }
+    }
+#else
+    (void) screen;
+#endif
     if (SDL_SetRelativeMouseMode(capture)) {
         LOGE("Could not set relative mouse mode to %s: %s",
              capture ? "true" : "false", SDL_GetError());
@@ -13,13 +33,16 @@ sc_screen_otg_set_mouse_capture(bool capture) {
 }
 
 static inline bool
-sc_screen_otg_get_mouse_capture(void) {
+sc_screen_otg_get_mouse_capture(struct sc_screen_otg *screen) {
+    (void) screen;
     return SDL_GetRelativeMouseMode();
 }
 
 static inline void
-sc_screen_otg_toggle_mouse_capture(void) {
-    sc_screen_otg_set_mouse_capture(!sc_screen_otg_get_mouse_capture());
+sc_screen_otg_toggle_mouse_capture(struct sc_screen_otg *screen) {
+    (void) screen;
+    bool new_value = !sc_screen_otg_get_mouse_capture(screen);
+    sc_screen_otg_set_mouse_capture(screen, new_value);
 }
 
 static void
@@ -86,7 +109,7 @@ sc_screen_otg_init(struct sc_screen_otg *screen,
 
     if (screen->mouse) {
         // Capture mouse on start
-        sc_screen_otg_set_mouse_capture(true);
+        sc_screen_otg_set_mouse_capture(screen, true);
     }
 
     return true;
@@ -198,7 +221,7 @@ sc_screen_otg_handle_event(struct sc_screen_otg *screen, SDL_Event *event) {
                     break;
                 case SDL_WINDOWEVENT_FOCUS_LOST:
                     if (screen->mouse) {
-                        sc_screen_otg_set_mouse_capture(false);
+                        sc_screen_otg_set_mouse_capture(screen, false);
                     }
                     break;
             }
@@ -232,7 +255,7 @@ sc_screen_otg_handle_event(struct sc_screen_otg *screen, SDL_Event *event) {
                     if (key == cap) {
                         // A mouse capture key has been pressed then released:
                         // toggle the capture mouse mode
-                        sc_screen_otg_toggle_mouse_capture();
+                        sc_screen_otg_toggle_mouse_capture(screen);
                     }
                     // Mouse capture keys are never forwarded to the device
                     return;
@@ -244,26 +267,26 @@ sc_screen_otg_handle_event(struct sc_screen_otg *screen, SDL_Event *event) {
             }
             break;
         case SDL_MOUSEMOTION:
-            if (screen->mouse && sc_screen_otg_get_mouse_capture()) {
+            if (screen->mouse && sc_screen_otg_get_mouse_capture(screen)) {
                 sc_screen_otg_process_mouse_motion(screen, &event->motion);
             }
             break;
         case SDL_MOUSEBUTTONDOWN:
-            if (screen->mouse && sc_screen_otg_get_mouse_capture()) {
+            if (screen->mouse && sc_screen_otg_get_mouse_capture(screen)) {
                 sc_screen_otg_process_mouse_button(screen, &event->button);
             }
             break;
         case SDL_MOUSEBUTTONUP:
             if (screen->mouse) {
-                if (sc_screen_otg_get_mouse_capture()) {
+                if (sc_screen_otg_get_mouse_capture(screen)) {
                     sc_screen_otg_process_mouse_button(screen, &event->button);
                 } else {
-                    sc_screen_otg_set_mouse_capture(true);
+                    sc_screen_otg_set_mouse_capture(screen, true);
                 }
             }
             break;
         case SDL_MOUSEWHEEL:
-            if (screen->mouse && sc_screen_otg_get_mouse_capture()) {
+            if (screen->mouse && sc_screen_otg_get_mouse_capture(screen)) {
                 sc_screen_otg_process_mouse_wheel(screen, &event->wheel);
             }
             break;

app/src/usb/usb.c

@@ -40,8 +40,9 @@ sc_usb_read_device(libusb_device *device, struct sc_usb_device *out) {
     if (result < 0) {
         // Log at debug level because it is expected that some non-Android USB
         // devices present on the computer require special permissions
-        LOGD("Open USB device %04" PRIx16 ":%04" PRIx16 ": libusb error: %s",
-             desc.idVendor, desc.idProduct, libusb_strerror(result));
+        LOGD("Open USB device %04x:%04x: libusb error: %s",
+             (unsigned) desc.idVendor, (unsigned) desc.idProduct,
+             libusb_strerror(result));
         return false;
     }
 
@@ -146,8 +147,10 @@ sc_usb_devices_log(enum sc_log_level level, struct sc_usb_device *devices,
     for (size_t i = 0; i < count; ++i) {
         struct sc_usb_device *d = &devices[i];
         const char *selection = d->selected ? "-->" : "   ";
-        LOG(level, "    %s %-18s (%04" PRIx16 ":%04" PRIx16 ")  %s %s",
-            selection, d->serial, d->vid, d->pid, d->manufacturer, d->product);
+        // Convert uint16_t to unsigned because PRIx16 may not exist on Windows
+        LOG(level, "    %s %-18s (%04x:%04x)  %s %s",
+            selection, d->serial, (unsigned) d->vid, (unsigned) d->pid,
+            d->manufacturer, d->product);
     }
 }
 
@@ -216,7 +219,25 @@ sc_usb_destroy(struct sc_usb *usb) {
     libusb_exit(usb->context);
 }
 
-static int
+static void
+sc_usb_report_disconnected(struct sc_usb *usb) {
+    if (usb->cbs && !atomic_flag_test_and_set(&usb->disconnection_notified)) {
+        assert(usb->cbs && usb->cbs->on_disconnected);
+        usb->cbs->on_disconnected(usb, usb->cbs_userdata);
+    }
+}
+
+bool
+sc_usb_check_disconnected(struct sc_usb *usb, int result) {
+    if (result == LIBUSB_ERROR_NO_DEVICE || result == LIBUSB_ERROR_NOT_FOUND) {
+        sc_usb_report_disconnected(usb);
+        return false;
+    }
+
+    return true;
+}
+
+static LIBUSB_CALL int
 sc_usb_libusb_callback(libusb_context *ctx, libusb_device *device,
                        libusb_hotplug_event event, void *userdata) {
     (void) ctx;
@@ -232,8 +253,7 @@ sc_usb_libusb_callback(libusb_context *ctx, libusb_device *device,
         return 0;
     }
 
-    assert(usb->cbs && usb->cbs->on_disconnected);
-    usb->cbs->on_disconnected(usb, usb->cbs_userdata);
+    sc_usb_report_disconnected(usb);
 
     // Do not automatically deregister the callback by returning 1. Instead,
     // manually deregister to interrupt libusb_handle_events() from the libusb
@@ -307,6 +327,7 @@ sc_usb_connect(struct sc_usb *usb, libusb_device *device,
 
     if (cbs) {
         atomic_init(&usb->stopped, false);
+        usb->disconnection_notified = (atomic_flag) ATOMIC_FLAG_INIT;
         if (sc_usb_register_callback(usb)) {
             // Create a thread to process libusb events, so that device
             // disconnection could be detected immediately
@@ -317,8 +338,6 @@ sc_usb_connect(struct sc_usb *usb, libusb_device *device,
                 LOGW("Libusb event thread handler could not be created, USB "
                      "device disconnection might not be detected immediately");
             }
-        } else {
-            LOGW("Could not register USB device disconnection callback");
         }
     }
 

app/src/usb/usb.h

@@ -22,6 +22,7 @@ struct sc_usb {
     sc_thread libusb_event_thread;
 
     atomic_bool stopped; // only used if cbs != NULL
+    atomic_flag disconnection_notified;
 };
 
 struct sc_usb_callbacks {
@@ -73,6 +74,11 @@ sc_usb_connect(struct sc_usb *usb, libusb_device *device,
 void
 sc_usb_disconnect(struct sc_usb *usb);
 
+// A client should call this function with the return value of a libusb call
+// to detect disconnection immediately
+bool
+sc_usb_check_disconnected(struct sc_usb *usb, int result);
+
 void
 sc_usb_stop(struct sc_usb *usb);
 

app/src/util/process_intr.c

@@ -3,27 +3,33 @@
 ssize_t
 sc_pipe_read_intr(struct sc_intr *intr, sc_pid pid, sc_pipe pipe, char *data,
                   size_t len) {
-    if (!sc_intr_set_process(intr, pid)) {
+    if (intr && !sc_intr_set_process(intr, pid)) {
         // Already interrupted
         return false;
     }
 
     ssize_t ret = sc_pipe_read(pipe, data, len);
 
-    sc_intr_set_process(intr, SC_PROCESS_NONE);
+    if (intr) {
+        sc_intr_set_process(intr, SC_PROCESS_NONE);
+    }
+
     return ret;
 }
 
 ssize_t
 sc_pipe_read_all_intr(struct sc_intr *intr, sc_pid pid, sc_pipe pipe,
                       char *data, size_t len) {
-    if (!sc_intr_set_process(intr, pid)) {
+    if (intr && !sc_intr_set_process(intr, pid)) {
         // Already interrupted
         return false;
     }
 
     ssize_t ret = sc_pipe_read_all(pipe, data, len);
 
-    sc_intr_set_process(intr, SC_PROCESS_NONE);
+    if (intr) {
+        sc_intr_set_process(intr, SC_PROCESS_NONE);
+    }
+
     return ret;
 }

app/tests/test_adb_parser.c

@@ -91,7 +91,6 @@ static void test_adb_devices_daemon_start_mixed() {
     struct sc_adb_device *device = &devices[0];
     assert(!strcmp("0123456789abcdef", device->serial));
     assert(!strcmp("unauthorized", device->state));
-    fprintf(stderr, "==== [%s]\n", device->model);
     assert(!device->model);
 
     device = &devices[1];

cross_win32.txt

@@ -21,3 +21,5 @@ ffmpeg_avformat = 'avformat-58'
 ffmpeg_avutil = 'avutil-56'
 prebuilt_ffmpeg = 'ffmpeg-win32-4.3.1'
 prebuilt_sdl2 = 'SDL2-2.0.20/i686-w64-mingw32'
+prebuilt_libusb_root = 'libusb-1.0.25'
+prebuilt_libusb = prebuilt_libusb_root + '/MinGW32'

cross_win64.txt

@@ -21,3 +21,5 @@ ffmpeg_avformat = 'avformat-59'
 ffmpeg_avutil = 'avutil-57'
 prebuilt_ffmpeg = 'ffmpeg-win64-5.0'
 prebuilt_sdl2 = 'SDL2-2.0.20/x86_64-w64-mingw32'
+prebuilt_libusb_root = 'libusb-1.0.25'
+prebuilt_libusb = prebuilt_libusb_root + '/MinGW64'

release.mk

@@ -66,17 +66,21 @@ prepare-deps-win32:
 	@app/prebuilt-deps/prepare-adb.sh
 	@app/prebuilt-deps/prepare-sdl.sh
 	@app/prebuilt-deps/prepare-ffmpeg-win32.sh
+	@app/prebuilt-deps/prepare-libusb.sh
 
 prepare-deps-win64:
 	@app/prebuilt-deps/prepare-adb.sh
 	@app/prebuilt-deps/prepare-sdl.sh
 	@app/prebuilt-deps/prepare-ffmpeg-win64.sh
+	@app/prebuilt-deps/prepare-libusb.sh
 
 build-win32: prepare-deps-win32
+	# -Dusb=false because of libusb-win32 build issue, cf #3011
 	[ -d "$(WIN32_BUILD_DIR)" ] || ( mkdir "$(WIN32_BUILD_DIR)" && \
 		meson "$(WIN32_BUILD_DIR)" \
 			--cross-file cross_win32.txt \
 			--buildtype release --strip -Db_lto=true \
+			-Dusb=false \
 			-Dcompile_server=false \
 			-Dportable=true )
 	ninja -C "$(WIN32_BUILD_DIR)"
@@ -107,6 +111,7 @@ dist-win32: build-server build-win32
 	cp app/prebuilt-deps/data/platform-tools-31.0.3/AdbWinApi.dll "$(DIST)/$(WIN32_TARGET_DIR)/"
 	cp app/prebuilt-deps/data/platform-tools-31.0.3/AdbWinUsbApi.dll "$(DIST)/$(WIN32_TARGET_DIR)/"
 	cp app/prebuilt-deps/data/SDL2-2.0.20/i686-w64-mingw32/bin/SDL2.dll "$(DIST)/$(WIN32_TARGET_DIR)/"
+	#cp app/prebuilt-deps/data/libusb-1.0.25/MinGW32/dll/libusb-1.0.dll "$(DIST)/$(WIN32_TARGET_DIR)/"
 
 dist-win64: build-server build-win64
 	mkdir -p "$(DIST)/$(WIN64_TARGET_DIR)"
@@ -125,6 +130,7 @@ dist-win64: build-server build-win64
 	cp app/prebuilt-deps/data/platform-tools-31.0.3/AdbWinApi.dll "$(DIST)/$(WIN64_TARGET_DIR)/"
 	cp app/prebuilt-deps/data/platform-tools-31.0.3/AdbWinUsbApi.dll "$(DIST)/$(WIN64_TARGET_DIR)/"
 	cp app/prebuilt-deps/data/SDL2-2.0.20/x86_64-w64-mingw32/bin/SDL2.dll "$(DIST)/$(WIN64_TARGET_DIR)/"
+	cp app/prebuilt-deps/data/libusb-1.0.25/MinGW64/dll/libusb-1.0.dll "$(DIST)/$(WIN64_TARGET_DIR)/"
 
 zip-win32: dist-win32
 	cd "$(DIST)/$(WIN32_TARGET_DIR)"; \