C언어에서 용량큰 파일 read할때

#define _GNU_SOURCE
#include <stdio.h>
#include <stdlib.h>
 
int
main(void)
{
   FILE *stream;
   char *line = NULL;
   size_t len = 0;
   ssize_t read;
 
   stream = fopen("/etc/motd", "r");
   if (stream == NULL)
	   exit(EXIT_FAILURE);
 
   while ((read = getline(&line, &len, stream)) != -1) {
	   printf("Retrieved line of length %zu :\n", read);
	   printf("%s", line);
   }
 
   free(line);
   fclose(stream);
   exit(EXIT_SUCCESS);
}