Signal programming problems

Signal programming problems-General Linux technology-Linux programming and kernel information. The following is a detailed description. # Include
# Include
# Include
Void fun_ctrl_c ();
Int main ()
{
(Void) signal (SIGINT, fun_ctrl_c );
Printf ("main program: the program enters an infinite loop! \ N ");
While (1)
{
Printf ("This is an infinite loop (to exit, press Ctrl + C )! \ N ");
Sleep (3 );
}
Exit (0 );

}

Void fun_ctrl_c ()
{
Printf ("\ t you press Ctrl + C Oh :) \ n ");
Printf ("\ t signal processing function: What to process, programming in the processing function! \ N ");
Printf ("\ t this example is not processed, and the default processing of the SIGINT signal is restored. \ N ");
(Void) signal (SIGINT, SIG_DFL );
}

This is to print every three seconds. this is an infinite loop (to exit, press Ctrl + C )!
What I want to ask is how to implement Ctrl + C recognition in this program. The custom function fun_ctrl_c () does not seem to see Ctrl + c recognition, in addition, this still recognizes Ctrl + c twice. The first press is to implement the function fun_ctrl_c, and the second press is to exit the program. How is this implemented?