#include <sys/select.h>
#include <sys/time.h>
#include <sys/stat.h>
#include <stddef.h>
#include <fcntl.h>
#include <stdio.h>

#define nfds 2

int
main() {

    fd_set read, write;

    struct timeval timeout;
    int fd1 = open("fds/1", O_RDWR),
        fd2 = open("fds/2", O_RDWR);

    printf("fd: %i\n", fd1);
    printf("fd: %i\n", fd2);

    int ready;

    FD_ZERO(&read);
    FD_ZERO(&write);

    FD_SET(fd1, &read);
    FD_SET(fd2, &read);

    for(;;){
        timeout.tv_sec = 5;
        timeout.tv_usec = 0;

        ready = select(nfds + 1, &read, NULL, NULL, &timeout);
        printf("ready = %i\t", ready);

        if (ready < 0) {
            perror("fail\n");
            return 1;
        } else if (ready > 0) {
            printf("reading\n");
        } else {
            printf("no data within time interval\n");
        }
    }

    return 0;
}