Libev, How to pass arguments to relevant callbacks

Question

I\'m trapped in a situation of argument passing in libev.

Usually, libev receives packages in a function like *receive_callback*, that\'s OK, but in pra

Answer 1

Yes it's explained in libev document, and there is another way. Each watcher has a void *data member that you can read or modify, and libev will completely ignore it, so you can pass the argument like this:

w->data = (void *)recv_buff;
...
static void my_cb (struct ev_loop *loop, ev_io *w_, int revents)
{
    S_RECV_MSG *recv_buff = (S_RECV_MSG*)w_->data;
    ...
}

see libev document.