what is the difference between EPOLL File descriptor and event file descriptor?

Question

i am using EPOLL and eventfd for IPC in threads but i am not getting the differences between the arguments epoll file descriptor and event file descriptor

can you please elaborate...

thank you.

Answer 1

epoll file descriptor : system call :

      int epoll_create1(int flags);  

returns the epoll file descriptor, also called efd . This descriptor is use for polling( epoll_wait ) and control(epoll_ctl) commands.

event file descriptor : Normal socket fd return from socket or accept like system calls knows as event file descriptor. These file descriptors are set events like EPOLLIN , EPOLLOUT , EPOLLET etc..

event file descriptors are register or bind on event file descriptor for polling the events.