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

enum { MAXLINE = 1024 };
char *info = NULL;

void log_message() {
  fprintf(stderr, info);
}

void handler(int signum) {
  log_message();
  free(info);
  info = NULL;
}

int main(void) {
  signal(SIGINT, handler);
  info = (char*)malloc(MAXLINE);

  while (1) {
    /* main loop program code */

    log_message();

    /* more program code */
  }
  return 0;
}

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

enum { MAXLINE = 1024 };
volatile sig_atomic_t eflag = 0;
char *info = NULL;

void log_message() {
  fprintf(stderr, info);
}

void handler(int signum) {
  eflag = 1;
}

int main(void) {
  signal(SIGINT, handler);
  info = (char*)malloc(MAXLINE);

  while (!eflag) {
    /* main loop program code */

    log_message();

    /* more program code */
  }

  log_message();
  free(info);
  info = NULL;

  return 0;
}