io_setcookie - associate cookie with descriptor

       io_setcookie  associates  a cookie (pointer to some anonymous data structure) with this descriptor.  Only
       one cookie can be associated with a descriptor.

       Use io_getcookie(3) to retrieve the cookie for a descriptor  (usually  after  io_canread  or  io_canwrite
       brought it to your attention).

       Please note that io_close does not deallocate your cookie.  You need to do that yourself.

       The  idea  is that you put the state associated with a TCP connection you serve in a common struct.  Then
       you do not need to have your own data structure to retrieve the state for a connection, you can just  use
       the data structure io_wait already maintains.  The lookup works in constant time and should not cause any
       cache misses.

       io_setcookie - associate cookie with descriptor

io_wait(3), io_getcookie(3)

                                                                                                 io_setcookie(3)

#include<libowfat/io.h>

       void io_setcookie(int64 fd,void* cookie);