if_down Kernel Service
Purpose
Marks an interface as down.
Syntax
#include <sys/types.h> #include <sys/errno.h> #include <net/if.h> void if_down ( ifp) register struct ifnet *ifp;
Parameter
| Item | Description |
|---|---|
| ifp | Specifies the ifnet structure associated with the interface array. |
Description
The if_down kernel service:
- Marks an interface as down by setting the flags field of the ifnet structure appropriately.
- Notifies the protocols of the transaction.
- Flushes the output queue.
The ifp parameter specifies the ifnet structure associated with the interface as the structure to be marked as down.
Execution Environment
The if_down kernel service can be called from either the process or interrupt environment.
Return Values
The if_down service has no return values.
Example
To mark an interface as down, invoke the if_down kernel service as follows:
if_down(ifp);