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doc: Add network interface link up/down hint

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Sebastian Huber 2014-10-16 07:29:37 +02:00
parent d5eac12255
commit 43dc972cbc
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@ -274,6 +274,17 @@ http://www.freebsd.org/cgi/man.cgi?query=resolver&sektion=3&apropos=0&manpath=Fr
http://www.freebsd.org/cgi/man.cgi?query=gethostbyname&sektion=3&apropos=0&manpath=FreeBSD+9.2-RELEASE[GETHOSTBYNAME(3)]:: Get network host entry
== Network Interface Drivers
=== Link Up/Down Events
You can notifiy the application space of link up/down events in your network
interface driver via the if_link_state_change(LINK_STATE_UP/LINK_STATE_DOWN)
function. The DHCPCD(8) client is a consumer of these events for example.
Make sure that the interface flag IFF_UP and the interface driver flag
IFF_DRV_RUNNING is set in case the link is up, otherwise ether_output() will
return the error status ENETDOWN.
== Issues and TODO
* Per-CPU data should be enabled once the new stack is ready for SMP.