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#include <signal.h> 
#include <stdlib.h>
#include <string.h>
 
char *err_msg; 
 
void handler() { 
  strcpy(err_msg, "SIGINT encountered.");
} 
 
int main() { 
  signal(SIGINT, handler); 

  err_msg = malloc(24);
  if(err_msg == NULL) {
    /* handle error condition */
  }
  strcpy(err_msg, "No errors yet.");
 
  /* main code loop */

  return 0;
}

#include <signal.h> 
#include <stdlib.h>
#include <string.h>
 
char *err_msg; 
volatile sig_atomic_t e_flag = 0;
 
void handler() { 
  e_flag = 1;
} 
 
int main() { 
  signal(SIGINT, handler); 

  err_msg = malloc(24);
  if (err_msg == NULL) {
    /* handle error condition */
  }

  strcpy(err_msg, "No errors yet.");
 
  /* main code loop */
  if(e_flag)
    strcpy(err_msg, "SIGINT received.");


  return 0;
}