1io_setcookie(3)            Library Functions Manual            io_setcookie(3)
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NAME

6       io_setcookie - associate cookie with descriptor
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SYNTAX

9       #include <io.h>
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11       void io_setcookie(int64 fd,void* cookie);
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DESCRIPTION

14       io_setcookie associates a cookie (pointer to some anonymous data struc‐
15       ture) with this descriptor.  Only one cookie can be associated  with  a
16       descriptor.
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18       Use  io_getcookie(3)  to  retrieve the cookie for a descriptor (usually
19       after io_canread or io_canwrite brought it to your attention).
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21       Please note that io_close does not deallocate your cookie.  You need to
22       do that yourself.
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24       The idea is that you put the state associated with a TCP connection you
25       serve in a common struct.  Then you do not need to have your  own  data
26       structure  to retrieve the state for a connection, you can just use the
27       data structure io_wait already maintains.  The lookup works in constant
28       time and should not cause any cache misses.
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SEE ALSO

31       io_wait(3), io_getcookie(3)
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35                                                               io_setcookie(3)
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