Description:
------------
i just got the same problem.
and i modify the function ssh2_scp_send.
i make it resume sending when it breaks,

it works.cause the socket is block.

anyone who need it.send me a email.

Reproduce code:
---------------
if ( bytesread !=  libssh2_channel_write(remote_file, buffer , bytesread) ) ) {
php_error_docref(NULL TSRMLS_CC, E_WARNING, "Failed copying file");
php_stream_close(local_file);
libssh2_channel_free(remote_file);
RETURN_FALSE;
}


Expected result:
----------------
bytesread ==  libssh2_channel_write(remote_file, buffer , bytesread)

Actual result:
--------------

bytesread <libssh2_channel_write(remote_file, buffer , bytesread)

it breaks and report a warning where send a large file.