io_getcookie(3) 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)
