Yes,The user level will never see LIBSSH2_ERROR_BAD_USE. I handle it in the function _libssh2_channel_receive_window_adjust(), just return it when LIBSSH2_ERROR_BAD_USE occur, and the channel->adjust_state will still be libssh2_NB_state_created, in the next time when sending , the function _libssh2_channel_write() will send the receive window adjust request in high priority before blocking. that can prevent LIBSSH2_ERROR_BAD_USE recurrence,then the receive window will expand normally. please see: http://www.libssh2.org/mail/libssh2-devel-archive-2011-08/0109.shtml
Regards liuzl
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