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24 lines
774 B
Groff
24 lines
774 B
Groff
.TH io_getcookie 3
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.SH NAME
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io_getcookie \- retrieve cookie
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.SH SYNTAX
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.B #include <io.h>
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void* \fBio_getcookie\fP(int64 fd);
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.SH DESCRIPTION
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io_getcookie retrieves a cookie (pointer to some anonymous data
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structure you associated with this descriptor).
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Use io_setcookie(3) to associate a cookie with a descriptor.
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If you did not associate a cookie with this descriptor, io_getcookie
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returns NULL.
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The idea is that you put the state associated with a TCP connection you
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serve in a common struct. Then you do not need to have your own data
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structure to retrieve the state for a connection, you can just use the
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data structure io_wait already maintains. The lookup works in constant
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time and should not cause any cache misses.
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.SH "SEE ALSO"
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io_wait(3), io_setcookie(3)
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