properly structure rfkill util

src/util/rfkill.cpp

@@ -0,0 +1,49 @@
+#include "util/rfkill.hpp"
+#include <unistd.h>
+#include <stdlib.h>
+#include <cstring>
+#include <fcntl.h>
+#include <cerrno>
+
+bool waybar::util::isDisabled(enum rfkill_type rfkill_type) {
+  struct rfkill_event event;
+  ssize_t len;
+  int fd;
+  int ret;
+  ret = false;
+
+  fd = open("/dev/rfkill", O_RDONLY);
+  if (fd < 0) {
+    //perror("Can't open RFKILL control device");
+    return false;
+  }
+
+  if (fcntl(fd, F_SETFL, O_NONBLOCK) < 0) {
+    //perror("Can't set RFKILL control device to non-blocking");
+    close(fd);
+    return false;
+  }
+
+  while(true) {
+    len = read(fd, &event, sizeof(event));
+    if (len < 0) {
+      if (errno == EAGAIN)
+        return 1;
+      //perror("Reading of RFKILL events failed");
+      return false;
+    }
+
+    if (len != RFKILL_EVENT_SIZE_V1) {
+      //fprintf(stderr, "Wrong size of RFKILL event\n");
+      return false;
+    }
+
+    if(event.type == rfkill_type) {
+      ret = event.soft || event.hard;
+      break;
+    }
+  }
+
+  close(fd);
+  return ret;
+}