all the way up to the user interface. All code modules bug sftp.c have
been completed.
Functions that return an "int", or similar return LIBSSH2CHANNEL_EAGAIN to
indicate some part of the call would block, in non-blocking mode.
Functions that return a structure, like "LIBSSH2_CHANNEL *", return NULL
and set the libssh2 error. The error can be obtained with either
libssh2_session_last_error() or libssh2_session_last_errno(). Either of
these will return the error code of LIBSSH2_ERROR_EAGAIN if the
call would block, in non-blocking mode.
The current state of a function and some variable are keep in the
structures so that on the next call the operation that would block can
be retried again with the same data.
various stuff if libssh2 was built with debug. If built without debug, the
function does nothing.
2 - configure --enable-debug is now enough to build a debug version (including
picky compiler options)
3 - internally, we no longer need/use #ifdef/#endif around all uses of the
_libssh2_debug() function/macro.
The scp.c example is the first application to test this new debug logging.
