Question

int (*foo)(epoll_event e, void *data);

If I name the file with cc extension, this gets accepted. With .c extension this

error: expected ‘)’ before ‘e’

I have googled and declaration seems to be valid for C. Can anyone please provide input on how to fix this?
Thanks

Answer 1

I’m guessing epoll_event is not a type name, it’s a structure tag name.

In this case you need to add struct:

  int (*foo)(struct epoll_event e, void *data);

This page suggests so:

struct epoll_event {
    uint32_t     events;      /* Epoll events */
    epoll_data_t data;        /* User data variable */
};