add some return values to some shit so it shuts down elegantly on crash

src/LCDDisplay.cpp

@@ -13,11 +13,22 @@
 /* lcd size hardcoded to 4x40 idgaf */
 LCDDisplay::LCDDisplay(const std::string& dev, const uint32_t baud) {
     _dev = dev;
-    this->open();  // calls this (LCDDisplay) open() function, LCDDisplay::open()
+    _baud = baud;
+}
+
+LCDDisplay::~LCDDisplay() {
+    this->close();
+}
+
+int LCDDisplay::Init() {
+    if (const int ret = this->open(); ret < 0) {
+        this->close();
+        return -1;
+    }
 
     struct termios term{};
     // Setup the serial port 8 data bits, no parity, 1 stopbit, no flow control
-    term.c_cflag = baud | CS8 | CSTOPB | CLOCAL | CREAD;
+    term.c_cflag = _baud | CS8 | CSTOPB | CLOCAL | CREAD;
     term.c_iflag = 0;
     term.c_oflag = 0;
     term.c_lflag = 0;
@@ -33,20 +44,18 @@ LCDDisplay::LCDDisplay(const std::string& dev, const uint32_t baud) {
 
     // clear display and set cursor home
     this->clear();
+    return 0;
 }
 
-LCDDisplay::~LCDDisplay() {
-    this->close();
-}
-
-void LCDDisplay::open(const bool reopen) {
+int LCDDisplay::open(const bool reopen) {
     applog(LOG::INF, "Opening serial port at \"{}\"", _dev);
     if (_lcd < 0 || reopen)
         _lcd = ::open(_dev.c_str(), O_RDWR | O_NOCTTY | O_NONBLOCK);  // ::open calls the global open() instead of LCDDisplay::open()
     if (_lcd < 0) {
         applog(LOG::ERR, "Error opening serial port \"{}\"", _dev);  // err
-        exit(_lcd);
+        return -1;
     }
+    return 0;
 }
 
 void LCDDisplay::close() {