evdaemon: clean up SIGCHLD

opencv-motion-detect/evdaemon.cpp

@@ -1173,6 +1173,11 @@ class EvWatchDog {
 
 EvWatchDog gWatchDog = EvWatchDog("/dev/ttyS1");
 
+void waitchild(int signal)
+{
+    while (waitpid((pid_t) (-1), 0, WNOHANG) > 0) {}
+}
+
 void cleanup(int signal)
 {
     // STOP watch dog
@@ -1186,7 +1191,7 @@ void cleanup(int signal)
 
 int main()
 {
-    // signal(SIGCHLD, cleanup);
+    signal(SIGCHLD, waitchild);
     signal(SIGINT, cleanup);
     signal(SIGTERM, cleanup);
     signal(SIGKILL, cleanup);