#include <assert.h>
#include <ev.h>
#include <ev.h>
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <fcntl.h>

#include <sys/types.h>
#include <sys/socket.h>

static void
child_read_cb(struct ev_loop *loop, ev_io *w, int revents)
{
    int fd = w->fd;
    char s[1024];
    ssize_t n = read(fd, s, 1023);
    assert(n >= 0);
    s[n] = '\0';
    printf(">>> Got line <%s>\n", s);
}

int
main(int argc, char *argv[])
{
    struct ev_loop *loop = ev_default_loop(0);
    ev_io read_ev;
    int fds[2], psock, csock;

    assert(socketpair(PF_UNIX, SOCK_STREAM, 0, fds) == 0);
    psock = fds[0];
    csock = fds[1];
    assert(fcntl(psock, F_SETFD, FD_CLOEXEC) == 0);
    assert(fcntl(psock, F_SETFD, O_NONBLOCK) == 0);
    if (fork() == 0)
        sleep(5);
    close(csock);
    ev_io_init(&read_ev, child_read_cb, psock, EV_READ);
    ev_io_start(loop, &read_ev);
    ev_loop(loop, 0);
}