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.TH io_passfd 3
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.SH NAME
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io_passfd \- pass a file descriptor over a Unix Domain socket
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.SH SYNTAX
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.B #include <io.h>
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int \fBio_passfd\fP(int64 sock,int64 fd);
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.SH DESCRIPTION
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io_passfd transfers the file descriptor \fIfd\fR over the Unix Domain
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socket \fIsock\fR. This works much like dup(2), only that the copy of
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the descriptor appears not in this process but at the other end of the
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Unix Domain socket (which therefore must be a process on the same
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system).
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The peer can then use io_receivefd(3) to receive the file descriptor.
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Note that the passed descriptor stays open in the sending process.
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.SH "RETURN VALUE"
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io_passfd returns 0 on success, -1 on error (setting errno accordingly).
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.SH "SEE ALSO"
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io_receivefd(3)
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