How to get errno when epoll_wait returns EPOLLERR?

Question

Is there a way to find out the errno when epoll_wait returns EPOLLERR for a particular fd?

Is there any further information about

Answer 1

Include errno.h and use perror to see the error message. Basically error is from the epfd or interupt, it will not arise from the file descriptor in your set.

include "errno.h"

if(epoll_wait() == -1)
    {
      perror("Epoll error : ");
    }