#include <stdio.h>
#include <sys/stat.h>
#include <unistd.h>

int main(void) {
    struct stat st;
    if (fstat(0, &st) < 0) {
        ssize_t rv;
        char c;
        perror("fstat");
        printf("attempting to read from 0...\n");
        rv = read(0, &c, 1);
        if (rv < 0)
            perror("read");
        else if (rv == 0)
            printf("EOF\n");
        else
            printf("read byte: %d\n", (int) c);
        return 1;
    }
    return 0;
}