Set the banner that will be sent to the remote host when the SSH session is
started with
libssh2_session_startup(3) This is optional; a banner corresponding to the protocol and libssh2 version will be sent by default.
RETURN VALUE
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.
ERRORS
LIBSSH2_ERROR_ALLOC - An internal memory allocation call failed.