Added and implemented signal behavior

1 files changed, 20 insertions, 2 deletions

diff --git a/main.cpp b/main.cpp
index 9d7b2e8..f04e5ea 100644
--- a/main.cpp
+++ b/main.cpp
@@ -1,19 +1,37 @@
+#include <cstdlib>
 #include <unistd.h>
 #include <led.h>
 #include <morse.h>
 #include <iostream> // let the user use this with a screen, too
 #include <parse.h>
+#include <csignal>
 using namespace std;
 void parse_args(int argc, char* argv[])
 {
   // nothing for now
 }
+void prepare_to_exit(int signum)
+{
+  cerr << "Received signal " << signum << ", exiting." << endl;
+  dash();
+  usleep(250000);
+  dash();
+  exit(signum);
+}
 int main(int argc, char* argv[])
 {
   if(geteuid()!=0) // must be root to control LEDS!
     {
-      cerr << "Need to be root to control LEDs!"<< endl;
-      cerr << "PiSH will work fine, but the LEDs can not be used." << endl;
+      int ret=seteuid(0);
+      if(!ret)
+	{
+	  cerr << "Cannot become root."<< endl;
+	  cerr << "LEDs will not be used." << endl;
+	}
+    }
+  for(int i=0;i<_NSIG;++i) // handle any and all signals by exiting
+    {
+      signal(i, &prepare_to_exit);
     }
   parse_args(argc, argv);
   init_morse();