iom_add - add event to I/O multiplexer

       iom_add adds an event you are interested in to an I/O multiplexer.

       fd  is the file descriptor (usually a socket) you are interested in, and events is the operation you want
       to do. It can be IOM_READ or IOM_WRITE.

       If that operation becomes possible on that descriptor, and some thread is calling iom_wait at  the  time,
       it will return and tell you the fd and the event.

       Note  that the event registration is removed from the iomux_t context if it occurs. You will have to call
       iom_wait again after you handled the event, if you are still interested in it.

       Closing a file descriptor with registered events will discard the event registration.

       You may have to add -lpthread to the command line in the linking step.

       iom_add - add event to I/O multiplexer

       iom_add returns 0 on success and -1 on error, setting errno.

       iom_init, iom_wait, iom_abort

                                                                                                      iom_add(3)

#include<libowfat/io.h>

       int iom_add(iomux_t* c, int64 fd, unsigned int events);