Hi all -- I am using the realtime-realtime IPC mechanism with
socket(AF_RTIPC, SOCK_DGRAM, IPCPROTO_IDDP) I have a server process that opens a socket and periodically checks if anything came in from a client (a separate process on the same machine), which may or may not be running. If a client is running, the server successfully receives the packet from the client; but if no client is running, the server's call to recvfrom() blocks forever. I'm confused among the various ways of making connections non-blocking -- I have tried the following: . According to the linux manpage for socket(), this should work: s = socket(...,type|SOCK_NONBLOCK,...) but with AF_RTIPC,SOCK_DGRAM socket() throws error "Address family not supported by protocol" . fcntl: int flags = fcntl(s,F_GETFL,0); fcntl(s, F_SETFL, flags | O_NONBLOCK); However, the first call to fcntl throws an error, "Bad file descriptor" (the file descriptor returned from socket() is 896, which is unusual). . setsockopt: I have seen some examples on the internet (with other socket types) of calling: setsockopt(s,level,SO_NONBLOCK,&one,sizeof(int)) however, I think this is non-standard -- I cannot find a definition of SO_NONBLOCK on my linux 3.4.6/xenomai 2.6.4 machine. Can anyone tell me how to make recvfrom non-blocking on an IDDP socket? Thanks! csmith _______________________________________________ Xenomai mailing list Xenomai@xenomai.org https://xenomai.org/mailman/listinfo/xenomai
