Force interface up before checking link status (#549751). (cherry picked from commit 28bd273b78885b535c25fae6a20a964f21e77213)
---
isys/linkdetect.c | 14 ++++++++++++++
1 files changed, 14 insertions(+), 0 deletions(-)
diff --git a/isys/linkdetect.c b/isys/linkdetect.c
index 1d1e33e..20877b3 100644
--- a/isys/linkdetect.c
+++ b/isys/linkdetect.c
@@ -130,6 +130,20 @@ int get_link_status(char * devname) {
return -1;
}
+ /* make sure interface is up and activated */
+ memset(&ifr, 0, sizeof(ifr));
+ strcpy(ifr.ifr_name, devname);
+
+ if (ioctl(sock, SIOCGIFFLAGS, &ifr) < 0) {
+ return -1;
+ }
+
+ ifr.ifr_flags |= (IFF_UP | IFF_RUNNING);
+
+ if (ioctl(sock, SIOCSIFFLAGS, &ifr) < 0) {
+ return -1;
+ }
+
/* Setup our control structures. */
memset(&ifr, 0, sizeof(ifr));
strcpy(ifr.ifr_name, devname);
--
1.6.6
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