2 files changed, 28 insertions, 3 deletions

diff --git a/tools/gsr-global-hotkeys/hotplug.c b/tools/gsr-global-hotkeys/hotplug.c
index ba3ef9c..5ea2978 100644
--- a/tools/gsr-global-hotkeys/hotplug.c
+++ b/tools/gsr-global-hotkeys/hotplug.c
@@ -22,7 +22,7 @@ bool hotplug_event_init(hotplug_event *self) {
 
     const int fd = socket(PF_NETLINK, SOCK_DGRAM, NETLINK_KOBJECT_UEVENT);
     if(fd == -1)
-        return false; /* Not root user */
+        return false;
 
     if(bind(fd, (void*)&nls, sizeof(struct sockaddr_nl))) {
         close(fd);
@@ -56,19 +56,21 @@ static void hotplug_event_parse_netlink_data(hotplug_event *self, const char *li
         if(strcmp(line, "SUBSYSTEM=input") == 0)
             self->subsystem_is_input = true;
 
-        if(self->subsystem_is_input && strncmp(line, "DEVNAME=", 8) == 0)
+        if(self->subsystem_is_input && strncmp(line, "DEVNAME=", 8) == 0) {
             callback(line+8, userdata);
+            self->event_is_add = false;
+        }
     }
 }
 
 /* Netlink uevent structure is documented here: https://web.archive.org/web/20160127215232/https://www.kernel.org/doc/pending/hotplug.txt */
 void hotplug_event_process_event_data(hotplug_event *self, int fd, hotplug_device_added_callback callback, void *userdata) {
     const int bytes_read = read(fd, self->event_data, sizeof(self->event_data));
-    int data_index = 0;
     if(bytes_read <= 0)
         return;
 
     /* Hotplug data ends with a newline and a null terminator */
+    int data_index = 0;
     while(data_index < bytes_read) {
         hotplug_event_parse_netlink_data(self, self->event_data + data_index, callback, userdata);
         data_index += strlen(self->event_data + data_index) + 1; /* Skip null terminator as well */
diff --git a/tools/gsr-global-hotkeys/main.c b/tools/gsr-global-hotkeys/main.c
index b64d60f..d05ca5f 100644
--- a/tools/gsr-global-hotkeys/main.c
+++ b/tools/gsr-global-hotkeys/main.c
@@ -116,6 +116,24 @@ static x11_context setup_x11_context(void) {
     return x_context;
 }
 
+static bool is_gsr_global_hotkeys_already_running(void) {
+    FILE *f = fopen("/proc/bus/input/devices", "rb");
+    if(!f)
+        return false;
+
+    bool virtual_keyboard_running = false;
+    char line[1024];
+    while(fgets(line, sizeof(line), f)) {
+        if(strstr(line, "gsr-ui virtual keyboard")) {
+            virtual_keyboard_running = true;
+            break;
+        }
+    }
+
+    fclose(f);
+    return virtual_keyboard_running;
+}
+
 int main(int argc, char **argv) {
     keyboard_grab_type grab_type = KEYBOARD_GRAB_TYPE_ALL;
     if(argc == 2) {
@@ -135,6 +153,11 @@ int main(int argc, char **argv) {
         return 1;
     }
 
+    if(is_gsr_global_hotkeys_already_running()) {
+        fprintf(stderr, "Error: gsr-global-hotkeys is already running\n");
+        return 1;
+    }
+
     x11_context x_context = setup_x11_context();
 
     const uid_t user_id = getuid();