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io_getcookie(3)       DragonFly Library Functions Manual       io_getcookie(3)

NAME
       io_getcookie - retrieve cookie

SYNTAX
       #include <io.h>

       void* io_getcookie(int64 fd);

DESCRIPTION
       io_getcookie retrieves a cookie (pointer to some anonymous data
       structure you associated with this descriptor).

       Use io_setcookie(3) to associate a cookie with a descriptor.

       If you did not associate a cookie with this descriptor, io_getcookie
       returns NULL.

       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.

SEE ALSO
       io_wait(3), io_setcookie(3)

                                                               io_getcookie(3)