From: Ulrich Drepper <[EMAIL PROTECTED]> Date: Wed, 14 Nov 2007 12:59:52 -0800
> Just FYI, with the current getaddrinfo code it is even more critical to > get to a point where I can cache network interface information and query > the kernel whether it changed. We now have to read the RTM_GETADDR > tables for every lookup. It was more limited with the old, incomplete > implementation. > > Even if it's something as simple as a RTM_SEQUENCE request which returns > a number that is bumped at every interface change. This sounds like a useful feature. Essentially you want a generation ID that increments every time a configuration change is made? Most daemons handle this by listening for events on the netlink socket, but I understand how that might not be practical for glibc. > Related: I need to know about the device type (the ARPHRD_* values) to > determine whether a device is for a native transport or a tunnel. What > I currently do is: > > - - at the beginning I get information about all interfaces using > RTM_GETADDR > > - - them later I have to find the device type by > > + reading the RTM_GETLINK data to get to the device name > > + then using the name and ioctl(SIOCGIFHWADDR) I get the device type > > > It would be so much nicer if the device type would be part of the > RTM_GETADDR data, or at least the RTM_GETLINK data. It's part of the link information, Look in ifinfomsg->ifi_type In general be suspicious if it seems netlink isn't providing the same information available via the old ioctls :-) - To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
