Dennis Windisch wrote: >> Yes. The trick is to fill the rtskb cache with some buffers (module >> parameter of rtnet.ko). > Thanks for your help. > > But now I've encountered another problem, namely in setting the sockets to > nonblocking mode (all this happens before rt_make_hard_real_time). > First I want to get the current flags of the socket: >> int tmp = fcntl(m_socket, F_GETFL, 0); > Then I want to add the "non-blocking" mode >> int res = fcntl(m_socket, F_SETFL,tmp | O_NONBLOCK); > > The error arises already in the first line. When I print out the value of > tmp, I always getting a "-1" indicating an error.
fcntl is not supported for RTDM devices, thus is also not available with RTnet file descriptors (and it would have been called rt_dev_fcntl anyway, just like rt_dev_ioctl, rt_dev_socket, etc.). > > How are the commands to get/set flags for RT-sockets? I've searched in the > documentation, but couldn't find them. I've just give it a try and used the > "ioctl_rt" command instead of "fnctl", but this also returned a negative > number (-95). We used to have a special IOCTL for the non-blocking mode, but that one was dropped in favour of the unified timeout mechanism of recent RTDM: use RTNET_RTIOC_TIMEOUT and pass an arbitrary negative timeout value. Hmm, this is documented in stack/include/rtnet.h, and also in the ChangeLog, but I see the need for an updated API overview - volunteers? Review will be provided. Jan
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