libssh2_channel_x11_req_ex - request an X11 forwarding channel
int libssh2_channel_x11_req_ex(LIBSSH2_CHANNEL *channel, int single_connection, const char *auth_proto, const char *auth_cookie, int screen_number);
int libssh2_channel_x11_req(LIBSSH2_CHANNEL *channel, int screen_number);
channel - Previously opened channel instance such as returned by libssh2_channel_open_ex
single_connection - non-zero to only forward a single connection.
auth_proto - X11 authentication protocol to use
auth_cookie - the cookie (hexadecimal encoded).
screen_number - the XLL screen to forward
Request an X11 forwarding on channel. To use X11 forwarding, libssh2_session_callback_set must first be called to set LIBSSH2_CALLBACK_X11. This callback will be invoked when the remote host accepts the X11 forwarding.
Return 0 on success or negative on failure. It returns LIBSSH2_ERROR_EAGAIN when it would otherwise block. While LIBSSH2_ERROR_EAGAIN is a negative number, it isn't really a failure per se.
LIBSSH2_ERROR_ALLOC - An internal memory allocation call failed.
LIBSSH2_ERROR_SOCKET_SEND - Unable to send data on socket.
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