libssh2_session_set_blocking - set or clear blocking mode on session
void libssh2_session_set_blocking(LIBSSH2_SESSION *session, int
session - session instance as returned by libssh2_session_init_ex(3)
blocking - Set to a non-zero value to make the channel block, or zero
to make it non-blocking.
Set or clear blocking mode on the selected on the session. This will
instantly affect any channels associated with this session. If a read
is performed on a session with no data currently available, a blocking
session will wait for data to arrive and return what it receives. A
non-blocking session will return immediately with an empty buffer. If
a write is performed on a session with no room for more data, a
blocking session will wait for room. A non-blocking session will
return immediately without writing anything.