hwitag_find_nicaddr()

Get the NIC address of a device

Synopsis:

#include <drvr/hwinfo.h>

int hwitag_find_nicaddr( unsigned hwi_off,
                         unsigned *nicaddr_idx,
                         uint8_t *nicaddr );

Arguments:

hwi_off

The offset into the hwinfo section of the system page for the device, which you can get by calling hwi_find_device().

nicaddr_idx

NULL, or a pointer to a location that holds the index of the NIC address that you want to find; see below.

nicaddr

NULL, or a pointer to a location where the function can store the NIC address.

Library:

libdrvr

Use the -l drvr option to qcc to link against this library.

Description:

You can use hwitag_find_nicaddr() to find one or more NIC (MAC) addresses associated with the device at hwi_off in the hwinfo section of the syspage. If the specified NIC address exists and hwi_off isn't NULL, hwitag_find_nicaddr() stores the retrieved address in the location that nicaddr points to.

Some devices contain multiple NIC addresses. You can retrieve all of them by using the nicaddr_idx parameter as follows:

• On the first call, set *nicaddr_idx to 0. The first address (if one exists) is returned in *nicaddr.
• You can then continue to call hwitag_find_nicaddr() with the same arguments until the function sets in *nicaddr to NULL.
• If you know that there's more than one NIC address for the specified device, you can set *nicaddr_idx to the entry number of the desired address. If that entry exists, the address will be returned in *nicaddr. For example, to obtain the third address for hwi_off, set *nicaddr_idx to 2 (base-0 indexing applies).
• If you're interested only in the first address, you can pass NULL for nicaddr_idx (which is the same as setting *nicaddr_idx to 0).

Returns:

0 on success (whether or not hwi_off is NULL) or -1 on error.

Classification:

QNX Neutrino

See also:

hwi_find(), hwi_find_bus(), hwi_find_device(), hwi_find_devicebus(), hwi_find_num_units(), hwi_find_unit(), hwi_tag_find(), hwiattr_get(), hwiattr_get_*(), hwitag_find_busattr(), hwitag_find_clkfreq(), hwitag_find_errata(), hwitag_find_ivec(), hwitag_find_phyaddr()