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#include <signal.h>
#include <stdlib.h>
#include <string.h>

char *err_msg;

void handler(int signum) {
  strcpy(err_msg, "SIGINT encountered.");
}

int main(void) {
  enum { MAX_MSG_SIZE = 24 };
  signal(SIGINT, handler);

  err_msg = (char *)malloc(MAX_MSG_SIZE);
  if (err_msg == NULL) {
    /* Handle error condition. */
  }
  strcpy(err_msg, "No errors yet.");

  /* Main code loop */

  return 0;
}