Leaky program

leaky.c

#include <stdio.h>
#include <unistd.h>
#include <string.h>

void open_file(char *filename)
{
    FILE *fd = fopen(filename, "r");
}

int main(void)
{
    char filename[FILENAME_MAX];
    strcpy(filename, "/etc/passwd");
    int iteration = 0;

    while (1) {
        iteration++;
        printf("Iteration %d\n", iteration);
         open_file(filename);

        sleep(60);

    }
       return 0;
}

How to compile
$ gcc -g leaky.c -o leaky