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docs: improve man page for libssh2_channel_request_auth_agent
Mention that the callback is needed for full functionality. This is inspired/copied from the existing X11 man pages. Closes #1503
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Viktor Szakats
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@ -16,9 +16,18 @@ request over this specific channel, which causes the agent listener to be
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started on the remote side upon success. This agent listener will then run
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for the duration of the SSH session.
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To use agent forwarding,
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.BR libssh2_session_callback_set2(3)
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must first be called to set \fBLIBSSH2_CALLBACK_AUTHAGENT\fP.
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This callback will be invoked when the remote host opens a connection to the
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local agent.
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\fIchannel\fP - Previously opened channel instance such as returned by
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.BR libssh2_channel_open_ex(3)
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.SH RETURN VALUE
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Return 0 on success or negative on failure. It returns
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LIBSSH2_ERROR_EAGAIN when it would otherwise block. While
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LIBSSH2_ERROR_EAGAIN is a negative number, it is not really a failure per se.
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.SH SEE ALSO
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.BR libssh2_session_callback_set2(3)
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