int event_add_read()

in src/event/cc_epoll.c [131:152]

• 14 lines of code
• 4 McCabe index (conditional complexity)

int event_add_read(struct event_base *evb, int fd, void *data)
{
    int status;

    ASSERT(evb != NULL && evb->ep > 0);
    ASSERT(fd >= 0);

    /*
     * Note(yao): there have been tests showing EPOLL_CTL_ADD is cheaper than
     * EPOLL_CTL_MOD, and the only difference is we need to ignore EEXIST
     */
    status = _event_update(evb, fd, EPOLL_CTL_ADD, EPOLLIN, data);
    if (status < 0 && errno != EEXIST) {
        log_error("ctl (add read) w/ epoll fd %d on fd %d failed: %s", evb->ep,
                fd, strerror(errno));
    }

    INCR(event_metrics, event_read);
    log_verb("add read event to epoll fd %d on fd %d", evb->ep, fd);

    return status;
}