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RTDM drivers refer to open files or sockets by using struct rtdm_fd. Normally, the user-side file descriptors returned by socket() or open() calls are not necessary for driver operations. However, in some special cases the user-side fd has to be determined, for example as return value of rt_tcp_accept() which is a driver function of RTnet's TCP protocol driver. Signed-off-by: Sebastian Smolorz <sebastian.smolorz@gmx.de> Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
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