[libvirt] [PATCHv2 1/4] util: add an ifaceGetIPAddress to the interface utilies

[Eric Blake]

On 07/20/2011 02:11 AM, Laine Stump wrote:

In the subject:

  s/utilies/utilities/

> This function uses ioctl(SIOCGIFADDR), which limits it to returning
> the first IPv4 address of an interface, but that's what we want right
> now (the place we're going to use the address only accepts one).
> ---
>   src/libvirt_private.syms |    1 +
>   src/util/interface.c     |   60 ++++++++++++++++++++++++++++++++++++++++++++++
>   src/util/interface.h     |    3 ++
>   3 files changed, 64 insertions(+), 0 deletions(-)

>
> @@ -511,6 +512,65 @@ ifaceSetMacAddress(const char *ifname ATTRIBUTE_UNUSED,
>
>
>   /**
> + * ifaceGetIPAddress:
> + * @ifname: name of the interface whose IP address we want
> + * @macaddr: MAC address (VIR_MAC_BUFLEN in size)
> + *
> + * This function gets the @macaddr for a given interface @ifname.
> + *
> + * Returns 0 in case of success or an errno code in case of failure.

Positive on error?  Should we instead be returing -errno, so callers can 
check < 0, per our typical usage?

Conditional ACK, depending on the answer to that question (the code 
looks correct, and converting to negative return on failure seems 
trivial enough if we decide to go that way).

-- 
Eric Blake   eblake at redhat.com    +1-801-349-2682
Libvirt virtualization library http://libvirt.org