Technical Reference: Kernel and Subsystems, Volume 1

if_down Kernel Service

Marks an interface as down.

#include <sys/types.h>
#include <sys/errno.h>
#include <net/if.h>
void if_down ( ifp)
register struct ifnet *ifp;

ifp	Specifies the ifnet structure associated with the interface array.

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.

The if_down kernel service can be called from either the process or interrupt environment.

The if_down service has no return values.

To mark an interface as down, invoke the if_down kernel service as follows:

if_down(ifp);

Network Kernel Services in AIX 5L Version 5.2 Kernel Extensions and Device Support Programming Concepts.