Is there any API(or special file) on Linux that provides an event on the change in link status of an ethernet card without polling ? i.e. when you plug in/out the cable ?
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Is there any API(or special file) on Linux that provides an event on the change in link status of an ethernet card without polling ? i.e. when you plug in/out the cable ?
You can get link up/down events via netlink. You would create a
PF_NETLINKsocket, bind to theRTMGRP_LINKgroup, and wait forRTM_NEWLINK/RTM_DELLINKmessages. Link up events haveIFF_RUNNINGandIFF_LOWER_UPset inifinfomsg.flags, while link down events have both flags cleared (funnily enough, I’m gettingRTM_NEWLINKmessages for both type of events).