libssh2_channel_flush_ex - flush a channel
int libssh2_channel_flush_ex(LIBSSH2_CHANNEL *channel, int streamid);
int libssh2_channel_flush(LIBSSH2_CHANNEL *channel);
int libssh2_channel_flush_stderr(LIBSSH2_CHANNEL *channel);
channel - Active channel stream to flush.
streamid - Specific substream number to flush. Groups of substreams may be flushed by passing on of the following Constants.
Flush the read buffer for a given channel instance. Individual substreams may be flushed by number or using one of the provided macros.
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.
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