mosh-client: return meaningful exitstatus on network setup/teardown or other failure

src/frontend/mosh-client.cc

@@ -163,12 +163,13 @@ int main( int argc, char *argv[] )
   /* Adopt native locale */
   set_native_locale();
 
+  bool success = false;
   try {
     STMClient client( ip, desired_port, key, predict_mode );
     client.init();
 
     try {
-      client.main();
+      success = client.main();
     } catch ( ... ) {
       client.shutdown();
       throw;
@@ -178,16 +179,19 @@ int main( int argc, char *argv[] )
   } catch ( const Network::NetworkException &e ) {
     fprintf( stderr, "Network exception: %s\r\n",
 	     e.what() );
+    success = false;
   } catch ( const Crypto::CryptoException &e ) {
     fprintf( stderr, "Crypto exception: %s\r\n",
 	     e.what() );
+    success = false;
   } catch ( const std::exception &e ) {
     fprintf( stderr, "Error: %s\r\n", e.what() );
+    success = false;
   }
 
   printf( "\n[mosh is exiting.]\n" );
 
   free( key );
 
-  return 0;
+  return !success;
 }

src/frontend/stmclient.cc

@@ -408,7 +408,7 @@ bool STMClient::process_resize( void )
   return true;
 }
 
-void STMClient::main( void )
+bool STMClient::main( void )
 {
   /* initialize signal handling and structures */
   main_init();
@@ -479,7 +479,7 @@ void STMClient::main( void )
 
       if ( sel.signal( SIGWINCH ) ) {
         /* resize */
-        if ( !process_resize() ) { return; }
+        if ( !process_resize() ) { return false; }
       }
 
       if ( sel.signal( SIGCONT ) ) {
@@ -572,5 +572,6 @@ void STMClient::main( void )
       }
     }
   }
+  return clean_shutdown;
 }
 

src/frontend/stmclient.h

@@ -118,7 +118,7 @@ public:
 
   void init( void );
   void shutdown( void );
-  void main( void );
+  bool main( void );
 
   ~STMClient()
   {