Chris Lightcap wrote: > Hi Jan, > > I've modified a simple arcnet communication program to support the > new real-time driver.. but I'm having a problem opening the socket > (the first step, i know!) where the function returns an integer > value of -97? The original program called the socket function with > the following socket type and protocol and I've modified it as > shown below. > > int sockfd = socket(PF_PACKET, SOCK_PACKET, htons(ETH_P_ALL)); // > the original > > int sockfd = rt_dev_socket(PF_PACKET, SOCK_RAW, htons(ETH_P_ALL)); > // the modified > > I know that SOCK_PACKET is an outdated socket type but the > alternative SOCK_RAW will not work either. I found in the > rt_pci32.c driver that the arguments AF_INET and SOCK_DGRAM work > but I need to use header information in the arcnet packets. > > Any suggestions? >
Depends on what you really need for your arcnet app: RTnet's rtpacket currently provide PF_PACKET:SOCK_DGRAM, i.e. "cooked" access to some networking device. And this access is limited to a per-protocol basis, which means no ETH_P_ALL. Moreover, it's a bit Ethernet-specific, see rt_packet_recvmsg(). Some generalisation of the rtpacket socket interface will therefore be required. Whether you also have to add ETH_P_ALL support, depends on your application design. Currently, the core would demux incoming arcnet protocols for you and and distribute them to different sockets (registered via socket(PF_PACKET, SOCK_DGRAM, <protocol>)). ETH_P_ALL would require exclusive device access because RTnet has currently no means to clone incoming packets for multiple receivers. SOCK_RAW might be necessary if there is no clean way to get all required arcnet header informations through the SOCK_DGRAM interface. Re-check your situation and suggest what you think it's best for your scenario. Then we can see how to generalise your usage scenario and integrate it cleanly. Jan
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