libssh2_poll_channel_read - check if data is available
int libssh2_poll_channel_read(LIBSSH2_CHANNEL *channel, int extended);
This function is deprecated. Do note use.
libssh2_poll_channel_read(3) checks to see if data is available in the
channel’s read buffer. No attempt is made with this method to see if
packets are available to be processed. For full polling support, use
Returns 1 when data is available and 0 otherwise.