iom_wait - wait for event from I/O multiplexer

       iom_wait  will  wait  for  events  registered  to  the I/O multiplexer with iom_add. It will wait timeout
       milliseconds.

       If during that time any of the registered events occur, iom_wait will set fd to the file  descriptor  the
       event  happened  on,  and events to the sum of IOM_READ, IOM_WRITE and IOM_ERROR, depending on what event
       actually happened, and return 1.

       If nothing happens during that time, it will return 0 and leave fd and events alone.

       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_wait - wait for event from I/O multiplexer

       iom_wait returns 1 on success, 0 if there was a timeout, and -1 on error, setting errno. If iom_abort was
       called on the I/O multiplexer context, it will return -2.

       iom_init, iom_add, iom_abort

                                                                                                     iom_wait(3)

#include<libowfat/io.h>

       int iom_wait(iomux_t* c,
                          int64* fd, unsigned int* events,              unsigned long timeout);