How to retrieve network link status from Kernel? Post: 302387818

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LEARN ABOUT DEBIAN

ifstatus

ifplugstatus(8) 					      System Manager's Manual						   ifplugstatus(8)

NAME

       ifplugstatus - A link beat detection tool

SYNOPSIS

       ifplugstatus [options] [INTERFACE]

DESCRIPTION

       ifplugstatus  is  an  utility  which may be used to detect the link status of a local Linux ethernet device, much in the same way mii-diag,
       mii-tool and ethtool work. In fact it supports all three different APIs these three tools use. In addition it supports link  checking  with
       the  IFF_RUNNING  interface  flag, which most modern drivers (not only ethernet) support, and association status checking with the wireless
       extension API for WLAN devices.

       The APIs are tried in the following order:

       First the newest API: SIOCETHTOOL (aka ethtool API)

       Second the next older API: SIOCGMIIREG (aka mii-diag API)

       Than the WLAN API: wireless extension (aka iwconfig API)

       Followed by the cleanest API: IFF_RUNNING (aka ifconfig API)

       The oldest API (SIOCPRIV aka mii-tool API) is not tested since it is obsolete.

       ifplugstatus may be used in shell script since it returns the current status as return value. It is especially useful to detect the  avail-
       able APIs on the used network driver. (Option -v)

OPTIONS

       You may specify an ethernet device on the command line. Otherwise ifplugstatus will check all available network interfaces.

       -a | --auto
	      Enable interface automatically before querying (default: off)

       -h | --help
	      Show help

       -q | --quiet
	      Decrease	verbosity by one. If the verbosity is < 0, no text will be shown, only the return value is relevant; if the verbosity is =
	      0, a terse status will be shown; If the verbosity is > 0, detailed information about the used API is returned. (By default the  ver-
	      bosity is 0)

       -v | --verbose
	      Increase verbosity by one. See option -q.

       -V | --version
	      Show version

RETURN VALUES

       0 Success

       1 Failure

       2 Link beat detected (only available when an interface is specified)

       3 Unplugged (same here)

AUTHOR

       ifplugd	  was	 written    by	  Lennart    Poettering    <mzvscyhtq	 (at)	 0pointer    (dot)    de>.   ifplugd   is   available	at
       http://0pointer.de/lennart/projects/ifplugd/

SEE ALSO

       mii-diag(8), mii-tool(8), ethtool(8), ifplugd(8)

COMMENTS

       This man page was written using xml2man(1) by Oliver Kurth.

Manuals 							       User							   ifplugstatus(8)