[Click] Element::selected()

[Ian Rose]

Hi list,

Is there any rational for why Element::selected() doesn't tell you what 
the file descriptor was selected for (reading vs. writing)?  Or is there 
a way to get this info that I don't know about?  It seems to me that if 
you have a FD that you are both reading and writing to (like a socket) 
you are pretty much stuck with something like:

void
Foo::selected(int fd)
{
    // perhaps fd was selected for writes...
    int rv = send(fd, ...);
    if (rv == -1) {
        if (errno == EAGAIN) {
            // oops - I guess fd was actually selected for reads
            int rv = recv(fd, ...);
            (etc)
        } else {
            // this is a "real" send failure
        }
    }
    // send succeeded!
    (etc)
}

Seems kinda ugly and inefficient to me...  Am I missing something?

I guess an alternative is to call select() on your fd to figure out 
which it was selected for, but that's rather redundant!

- Ian