Add specific exit code for device disconnection

Modify the return logic such that exit code 1 is used when the initial
connection fails, but if a session is established, and then the device
disconnects, exit code 2 is emitted.

Fixes #3083 <https://github.com/Genymobile/scrcpy/issues/3083>
PR #3085 <https://github.com/Genymobile/scrcpy/pull/3085>
Signed-off-by: martin f. krafft <madduck@madduck.net>
Signed-off-by: Romain Vimont <rom@rom1v.com>

app/scrcpy.1

@@ -355,6 +355,12 @@ Set the initial window height.
 
 Default is 0 (automatic).
 
+.SH EXIT STATUS
+.B scrcpy
+will exit with code 0 on normal program termination. If an initial
+connection cannot be established, the exit code 1 will be returned. If the
+device disconnects while a session is active, exit code 2 will be returned.
+
 .SH SHORTCUTS
 
 In the following list, MOD is the shortcut modifier. By default, it's (left)

app/src/main.c

@@ -40,19 +40,19 @@ main(int argc, char *argv[]) {
 #endif
 
     if (!scrcpy_parse_args(&args, argc, argv)) {
-        return 1;
+        return SCRCPY_EXIT_FAILURE;
     }
 
     sc_set_log_level(args.opts.log_level);
 
     if (args.help) {
         scrcpy_print_usage(argv[0]);
-        return 0;
+        return SCRCPY_EXIT_SUCCESS;
     }
 
     if (args.version) {
         scrcpy_print_version();
-        return 0;
+        return SCRCPY_EXIT_SUCCESS;
     }
 
 #ifdef SCRCPY_LAVF_REQUIRES_REGISTER_ALL
@@ -66,17 +66,17 @@ main(int argc, char *argv[]) {
 #endif
 
     if (avformat_network_init()) {
-        return 1;
+        return SCRCPY_EXIT_FAILURE;
     }
 
 #ifdef HAVE_USB
-    bool ok = args.opts.otg ? scrcpy_otg(&args.opts)
+    enum scrcpy_exit_code ret = args.opts.otg ? scrcpy_otg(&args.opts)
-                            : scrcpy(&args.opts);
+                                              : scrcpy(&args.opts);
 #else
-    bool ok = scrcpy(&args.opts);
+    enum scrcpy_exit_code ret = scrcpy(&args.opts);
 #endif
 
     avformat_network_deinit(); // ignore failure
 
-    return ok ? 0 : 1;
+    return ret;
 }

app/src/scrcpy.c

@@ -149,23 +149,23 @@ sdl_configure(bool display, bool disable_screensaver) {
     }
 }
 
-static bool
+static enum scrcpy_exit_code
 event_loop(struct scrcpy *s) {
     SDL_Event event;
     while (SDL_WaitEvent(&event)) {
         switch (event.type) {
             case EVENT_STREAM_STOPPED:
                 LOGW("Device disconnected");
-                return false;
+                return SCRCPY_EXIT_DISCONNECTED;
             case SDL_QUIT:
                 LOGD("User requested to quit");
-                return true;
+                return SCRCPY_EXIT_SUCCESS;
             default:
                 sc_screen_handle_event(&s->screen, &event);
                 break;
         }
     }
-    return false;
+    return SCRCPY_EXIT_FAILURE;
 }
 
 // Return true on success, false on error
@@ -265,7 +265,7 @@ sc_server_on_disconnected(struct sc_server *server, void *userdata) {
     // event
 }
 
-bool
+enum scrcpy_exit_code
 scrcpy(struct scrcpy_options *options) {
     static struct scrcpy scrcpy;
     struct scrcpy *s = &scrcpy;
@@ -273,12 +273,12 @@ scrcpy(struct scrcpy_options *options) {
     // Minimal SDL initialization
     if (SDL_Init(SDL_INIT_EVENTS)) {
         LOGE("Could not initialize SDL: %s", SDL_GetError());
-        return false;
+        return SCRCPY_EXIT_FAILURE;
     }
 
     atexit(SDL_Quit);
 
-    bool ret = false;
+    enum scrcpy_exit_code ret = SCRCPY_EXIT_FAILURE;
 
     bool server_started = false;
     bool file_pusher_initialized = false;
@@ -332,7 +332,7 @@ scrcpy(struct scrcpy_options *options) {
         .on_disconnected = sc_server_on_disconnected,
     };
     if (!sc_server_init(&s->server, &params, &cbs, NULL)) {
-        return false;
+        return SCRCPY_EXIT_FAILURE;
     }
 
     if (!sc_server_start(&s->server)) {
@@ -361,7 +361,7 @@ scrcpy(struct scrcpy_options *options) {
 
     if (!connected) {
         // This is not an error, user requested to quit
-        ret = true;
+        ret = SCRCPY_EXIT_SUCCESS;
         goto end;
     }
 

app/src/scrcpy.h

@@ -6,7 +6,18 @@
 #include <stdbool.h>
 #include "options.h"
 
-bool
+enum scrcpy_exit_code {
+    // Normal program termination
+    SCRCPY_EXIT_SUCCESS,
+
+    // No connection could be established
+    SCRCPY_EXIT_FAILURE,
+
+    // Device was disconnected while running
+    SCRCPY_EXIT_DISCONNECTED,
+};
+
+enum scrcpy_exit_code
 scrcpy(struct scrcpy_options *options);
 
 #endif

app/src/usb/scrcpy_otg.c

@@ -29,26 +29,26 @@ sc_usb_on_disconnected(struct sc_usb *usb, void *userdata) {
     }
 }
 
-static bool
+static enum scrcpy_exit_code
 event_loop(struct scrcpy_otg *s) {
     SDL_Event event;
     while (SDL_WaitEvent(&event)) {
         switch (event.type) {
             case EVENT_USB_DEVICE_DISCONNECTED:
                 LOGW("Device disconnected");
-                return false;
+                return SCRCPY_EXIT_DISCONNECTED;
             case SDL_QUIT:
                 LOGD("User requested to quit");
-                return true;
+                return SCRCPY_EXIT_SUCCESS;
             default:
                 sc_screen_otg_handle_event(&s->screen_otg, &event);
                 break;
         }
     }
-    return false;
+    return SCRCPY_EXIT_FAILURE;
 }
 
-bool
+enum scrcpy_exit_code
 scrcpy_otg(struct scrcpy_options *options) {
     static struct scrcpy_otg scrcpy_otg;
     struct scrcpy_otg *s = &scrcpy_otg;
@@ -67,7 +67,7 @@ scrcpy_otg(struct scrcpy_options *options) {
         LOGW("Could not enable mouse focus clickthrough");
     }
 
-    bool ret = false;
+    enum scrcpy_exit_code ret = SCRCPY_EXIT_FAILURE;
 
     struct sc_hid_keyboard *keyboard = NULL;
     struct sc_hid_mouse *mouse = NULL;
@@ -90,7 +90,7 @@ scrcpy_otg(struct scrcpy_options *options) {
     };
     bool ok = sc_usb_init(&s->usb);
     if (!ok) {
-        return false;
+        return SCRCPY_EXIT_FAILURE;
     }
 
     struct sc_usb_device usb_device;

app/src/usb/scrcpy_otg.h

@@ -3,10 +3,10 @@
 
 #include "common.h"
 
-#include <stdbool.h>
 #include "options.h"
+#include "scrcpy.h"
 
-bool
+enum scrcpy_exit_code
 scrcpy_otg(struct scrcpy_options *options);
 
 #endif