cnet's Application Programming Interface

NAME

CNET_carrier_sense - determines if a LT_LAN or LT_WLAN link is busy.

SYNOPSIS

#include <cnet.h>

int CNET_carrier_sense(int link);

DESCRIPTION

CNET_carrier_sense indicates if the indicated LT_LAN or LT_WLAN link is currently transmitting or receiving a signal.

RETURN VALUE

The value 1 is returned if the link is currently transmitting or receiving a signal. The value 0 is returned if there is no error, and the link is neither transmitting nor receiving a signal. On failure, the value -1 is returned, and the global variable cnet_errno is set to one of the following values to describe the error:

ER_BADLINK

The value of link is not a valid link number.

ER_LINKDOWN

The indicated link is down.

ER_NOTREADY

The current node is rebooting.

ER_NOTSUPPORTED

The indicated link is not of type LT_LAN or LT_WLAN.

SEE ALSO

CNET_write_physical.