Add possibility to configure retrying for opening the input device

Author: coder-hugo

src/configuraion.c

@@ -78,6 +78,8 @@ configuration_t read_config(const char *filename) {
     errno = EINVAL;
     die("error: no touch device defined");
   }
+  result.retries = (uint8_t) iniparser_getint(ini, "general:retries", 2);
+  result.retry_delay = (uint8_t) iniparser_getint(ini, "general:retrydelay", 5);
   result.scroll.vert = iniparser_getboolean(ini, "scroll:vertical", false);
   result.scroll.horz = iniparser_getboolean(ini, "scroll:horizontal", false);
   result.scroll.vert_delta = (int8_t) iniparser_getint(ini, "scroll:verticaldelta", 79);
@@ -97,7 +99,7 @@ configuration_t read_config(const char *filename) {
       fill_keys_array(&result.swipe_keys[i][j].keys, iniparser_getstring(ini, ini_key, NULL));
     }
   }
-  
+
   iniparser_freedict(ini);
   return result;
 }

src/configuraion.h

@@ -41,6 +41,8 @@ typedef struct keys_array {
 
 typedef struct configuration {
   char *touch_device_path;
+  uint8_t retries;
+  uint8_t retry_delay;
   struct scroll_options {
     bool vert;
     bool horz;

src/main.c

@@ -66,10 +66,20 @@ int main(int argc, char *argv[]) {
     uinput_fd = init_uinput(keys);
     free(keys);
 
-    touch_device_fd = open(config.touch_device_path, O_RDONLY);
+    int8_t retries = 0;
+    while (retries < config.retries + 1) {
+      printf("Looking for input device: %s (Attempt %i/%i)\n", config.touch_device_path, retries + 1, config.retries + 1);
+      touch_device_fd = open(config.touch_device_path, O_RDONLY);
+      if (touch_device_fd > 0) {
+        break;
+      }
+      sleep(config.retry_delay);
+      retries++;
+    }
     if (touch_device_fd < 0) {
-      die("error: open");
+      die("Failed to open input device");
     }
+    printf("Opened input device: %s\n", config.touch_device_path);
     process_events(touch_device_fd, config, &execute_events);
 
     close(touch_device_fd);