How to use epoll (simple)

#include <cstdlib>
#include <sys/epoll.h>
#include <iostream>

#define MAXEVENTS 64

using namespace std;

string readLine(int fd) {
    char in;
    string buffer;

    // Read till the end, or a newline.
    while(read(fd, &in, 1) > 0) {
        buffer.push_back(in);

        if(in == '\n') {
            break;
        }
    }

    return buffer;
}


int main(int argc, char** argv) {

    // Create the epoll FD:
    int epollFd = epoll_create1(0);
    if(epollFd == -1) {
        cout << "Unable to create epoll instance." << endl;
        return 1;
    }

    // Let's read from the stdin:
    epoll_event readEvent;
    readEvent.data.fd = 0; // 0 = STDIN.
    readEvent.events  = EPOLLIN | EPOLLET; // EPOLLIN | EPOLLPRI | EPOLLERR | EPOLLHUP

    // Attempt to add the event:
    if(epoll_ctl(epollFd, EPOLL_CTL_ADD, readEvent.data.fd, &readEvent) == -1) {
        cout << "Unable to add fd to epoll" << endl;
        return 1;
    }

    // Will hold all recent events:
    epoll_event *newEvents = (struct epoll_event*) calloc (MAXEVENTS, sizeof readEvent);

    while(1) {

        cout << "Calling epoll wait." << endl;

        // Blocking call, will wait until an event occurs:
        int eventCount = epoll_wait (epollFd, newEvents, MAXEVENTS, -1);

        // Iterate over all events:
        for(int i = 0; i < eventCount; ++i) {
            epoll_event& event = newEvents[i];

            cout << "Received some sort of event!" << endl;

            // Most scripts include this, I'm actually unsure why.
            if ((event.events & EPOLLERR) || (event.events & EPOLLHUP) || (!(event.events & EPOLLIN))) {
                cout << "Some sort of broken socket? Closing said socket now." << endl;
                close (event.data.fd);
            }

            // Read some data:
            string line = readLine(event.data.fd);

            cout << "Data read: " << line;
        }

    }

    return 0;
}