c - CAN Bus - handle multiple CAN Bus sockets

Question

I am attempting to read/write to multiple CAN Bus sockets on a device out of the same thread. However, I am only getting RX messages when I write to the boards that are supposed to be on can1 when I write to can0's file descriptor.

I am thinking it is due to how the interface indices are bound. The ifr_ifindex is 0 for both sockets I have opened.

ioctl(s, SIOCGIFINDEX, &ifr);

addr.can_ifindex = ifr.ifr_ifindex;

bind(s, (struct sockaddr*)&addr, sizeof(addr));

What is the proper procedure for handling multiple CAN sockets when determining or setting the interface index using ioctl?

Answer 1

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