VxWorks Reference Manual : Libraries
if_loop - software loopback network interface driver
loattach( ) - publish the lo network interface and initialize the driver and pseudo-device
This module implements the software loopback network interface driver. The only user-callable routine is loattach( ), which publishes the lo interface and initializes the driver and device.
This interface is used for protocol testing and timing. By default, the loopback interface is accessible at Internet address 127.0.0.1.
This device is "software only." A jumpering diagram is not applicable.
loattach( ) - publish the lo network interface and initialize the driver and pseudo-device
STATUS loattach (void)
This routine attaches an lo Ethernet interface to the network, if the interface exists. It makes the interface available by filling in the network interface record. The system initializes the interface when it is ready to accept packets.
OK.