On 09.07.19 16:49, Lange Norbert via Xenomai wrote: > Hi, > > I am opening a packetsocket, which is supposed to be realtime. Unfortunatly > if the rtpacket (rtnet?) module is not loaded, > then this will just silently fall back to a linux packet socket. Then later > demote thread during accesses. > > How would I be able to detect this early during startup? I could __STD(close) > the descriptor and check the returncode for EBADF I suppose... >
Yeah, looks this is some feature we lost while embedding the RTDM file descriptor range into the regular Linux space. We could either add a compile-time or runtime feature to libcobalt that permits to disable this silent fallback again or introduce alternative open and socket implementations that do not expose this behavior. Spontaneously, I would be in favor or a runtime switch for the existing implementations. Jan -- Siemens AG, Corporate Technology, CT RDA IOT SES-DE Corporate Competence Center Embedded Linux
