c code to register a signal (posix) handler

/*

 * the below code is used to register a signal handler.

 */

#include <signal.h>

#include <assert.h>

#include <unistd.h>

#include <stdio.h>

void myhandler(int signum) {

   printf("Signal catched!\n");

}

int main(void) {

   int ret;

   struct sigaction action = {

      .sa_handler = myhandler,

   };

   ret = sigaction(SIGUSR1, & action, NULL);

   assert(ret == 0);

   while(1);

   return 0;

}