[libssh2] Non-blocking vs. standard functions

I am in the process of update libssh2_sftp_readdir() so it will work
in true non-blocking mode, just like Daniel Stenberg did with his
excellent work with libssh2_sftp_readnb() and libssh2_sftp_writenb
(). However, I have noticed that now libssh2_sftp_read() and
libssh2_sftp_write() explicitly set blocking to on in their
operation, and I am guessing the same is true for
libssh2_channel_read_ex() and libssh2_channel_write_ex(). While it
always has been possible for the consumer of libssh2 to call
libssh2_channel_set_blocking() and turn off blocking, did it work?

If it does work, are there programs that are depending on that
functionality? The fix looks like it might be straight forward, just
not force blocking on. If it doesn't work, should it be dropped from
the external interface.

Jim

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