This how I think ifplugd should work, it should not poll it
should just use libnetlink and read for the next message.
The RUNNING flag works for wireless and non-wireless devices.
If there is a driver it doesn't work on than that is a bug in
the device driver and should be fixed ASAP, not worked around
in user space.
===============================
/* Demo of how to monitor link status with netlink */
#include <stdio.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <linux/netdevice.h>
#include "libnetlink.h"
static int filter_link(const struct sockaddr_nl *who,
struct nlmsghdr *n, void *arg)
{
struct ifinfomsg *ifi = NLMSG_DATA(n);
struct rtattr * tb[IFLA_MAX+1];
int len = n->nlmsg_len;
if (n->nlmsg_type != RTM_NEWLINK && n->nlmsg_type != RTM_DELLINK)
return 0;
len -= NLMSG_LENGTH(sizeof(*ifi));
if (len < 0)
return -1;
parse_rtattr(tb, IFLA_MAX, IFLA_RTA(ifi), len);
if (n->nlmsg_type == RTM_DELLINK)
printf("Deleted ");
printf("%d: %s %s,%sCARRIER\n", ifi->ifi_index,
tb[IFLA_IFNAME] ? (char *) RTA_DATA(tb[IFLA_IFNAME]) : "???",
(ifi->ifi_flags & IFF_UP) ? "UP" : "DOWN",
(ifi->ifi_flags & IFF_RUNNING) ? "": "NO");
return 0;
}
int main(int argc, char **argv)
{
struct rtnl_handle rth;
if (rtnl_open(&rth, RTMGRP_LINK) < 0) {
fprintf(stderr, "Cannot open rtnetlink\n");
return -1;
}
if (rtnl_wilddump_request(&rth, AF_UNSPEC, RTM_NEWLINK) < 0) {
perror("Cannot send dump request");
return -1;
}
return (rtnl_listen(&rth, filter_link, NULL) < 0) ? 1 : 0;
}
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