Added isOpen, and credited John Harrison as an author as well.

include/serial.h

 /**
  * @file serial.h
  * @author  William Woodall <wjwwood@gmail.com>
+ * @author  John Harrison   <ash.gti@gmail.com>
  * @version 0.1
  *
  * @section LICENSE
@@ -143,6 +144,12 @@ public:
     */
     void open();
     
+    /** Gets the status of the serial port.
+    * 
+    * @return A boolean value that represents whether or not the serial port is open.
+    */
+    const bool isOpen();
+    
     /** Closes the serial port and terminates threads. */
     void close();
     

src/serial.cpp

@@ -182,6 +182,12 @@ void Serial::open() {
     }
 }
 
+const bool Serial::isOpen() {
+    if(this->serial_port != NULL)
+        return this->serial_port->is_open();
+    return false;
+}
+
 void Serial::close() {
     // Cancel the current timeout timer and async reads
     this->timeout_timer.cancel();

src/test_serial.cpp

@@ -13,6 +13,12 @@ int main(int argc, char **argv)
     
     serial::Serial serial(port, 115200, 250);
     
+    std::cout << "Is the serial port open?";
+    if(serial.isOpen())
+        std::cout << " Yes." << std::endl;
+    else
+        std::cout << " No." << std::endl;
+    
     int count = 0;
     while (count >= 0) {
         int bytes_wrote = serial.write("Testing.");