Не понял прикола fopen()

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


int
main(int argc, char **argv)
{
    FILE *fp1 = NULL;
    FILE *fp2 = NULL;

    char *abs1 = "/test.bin";
    char *abs2 = "/home/test.bin";

    fp1 = fopen(abs1, "r");
    if (!fp1) {
        printf("Cannot open file %s (%d)\n", abs1, fp1);
    } else {
        printf("Success open file %s (%d)\n", abs1, fp1);
    }

    fp2 = fopen(abs2, "r");
    if (!fp2) {
        printf("Cannot open file %s (%d)\n", abs2, fp2);
    } else {
        printf("Success open file %s (%d)\n", abs2, fp2);
    }

    return 0;
}

Success open file /test.bin (8671248)
Cannot open file /home/test.bin (0)