Messages in this thread | | | Date | Wed, 18 May 2005 23:20:35 +0100 | From | Baruch Even <> | Subject | Re: Detecting link up |
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Stephen Hemminger wrote: > Filipe Abrantes wrote: > >> Hi all, >> >> I need to detect when an interface (wired ethernet) has link up/down. >> Is there a system signal which is sent when this happens? What is the >> best way to this programatically? >> >> Best Regards >> >> Filipe >> >> > > The best way is to open a netlink socket and look for the mesaages about > link up/down there. Read iproute2 http://developer.osdl.org/dev/iproute2 > source for ip command (ipmonitor.c). > > This works for almost all devices unlike ethtool and mii which only > work on a small subset of devices.
And libnl is a very good library to get just that information without the need to manually parse netlink messages.
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