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io_getcookie(3)		   Library Functions Manual	       io_getcookie(3)

NAME
       io_getcookie - retrieve cookie

SYNTAX
       #include	<libowfat/io.h>

       void* io_getcookie(int64	fd);

DESCRIPTION
       io_getcookie  retrieves a cookie	(pointer to some anonymous data	struc-
       ture 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)

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