I’m writing a CAN logger program. The way I log the data is similar to the way the candump-tool is doing it when invoking candump like candump any: https://github.com/linux-can/can-utils/blob/master/candump.c candump any makes candump bind to any device, i.e. addr.can_ifindex = 0; then it uses recvmsg to obtain a CAN frame, then it gets the on the struct msghdr msg; attached