LIBSSH2_CHANNEL * libssh2_channel_forward_accept(LIBSSH2_LISTENER *listener);
listener is a forwarding listener instance as returned by libssh2_channel_forward_listen_ex.
When this function returns NULL use libssh2_session_last_errno to extract the error code. If that code is LIBSSH2_ERROR_EAGAIN, the session is set to do non-blocking I/O but the call would block.
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