Re: RFC - document network device carrier management
From: Jan Engelhardt <hidden>
Date: 2012-09-10 02:00:13
On Wednesday 2012-08-15 17:58, Stephen Hemminger wrote:
quoted hunk ↗ jump to hunk
--- a/Documentation/networking/netdevices.txt 2012-06-22 08:27:46.729168196 -0700 +++ b/Documentation/networking/netdevices.txt 2012-08-15 08:56:31.120429994 -0700@@ -45,6 +45,36 @@ drop, truncate, or pass up oversize packpackets is preferred. +CARRIER +======= +Most network devices have an operational state that the device +monitors. The Linux kernel uses the name "carrier" for this flag which +is a historical reference to old modems. Carrier is reported to +userspace via the IFF_RUNNING flag from SIOCGIFFLAGS ioctl.
I think Netlink should be mentioned instead: Carrier is reported to userspace via the IFF_RUNNING flag in struct ifinfomsg.ifi_flags returned by RTM_GETLINK (see rtnetlink(7)).