Greetings, Ken Brown!
> While investigating emacs test failures, I found two problems with the
> interfaces returned by getifaddrs(3):
> 1. For an IPv6 interface, the netmask address family is always 0 instead of
> AF_INET6.
> 2. For a disconnected interface, the IPv4 address and netmask are sometimes 0.
For a disconnected interface this could be true as
Configuration for interface "TAP12"
DHCP enabled: Yes
IP Address: 172.16.40.6
Subnet Prefix: 172.16.40.0/24 (mask 255.255.255.0)
InterfaceMetric: 25
Configuration for interface "TAP55"
DHCP enabled: Yes
InterfaceMetric: 25
Configuration for interface "TAP63"
DHCP enabled: No
IP Address: 172.18.104.18
Subnet Prefix: 172.18.104.0/22 (mask 255.255.252.0)
InterfaceMetric: 25
There's actually no IP address assigned to TAP55, which could be reported as
0/0.
Can you please cross-check with
netsh interface ipv4 show addr
> I will be sending patches to fix these problems later today, but I wanted to
> report them here for reference.
> I don't know enough about this to be sure that problem 2 is really a Cygwin
> bug.
> Are there cases where a 0 IP address is appropriate? Or should it be up to
> the caller of getifaddrs to handle that case?
--
With best regards,
Andrey Repin
Tuesday, July 27, 2021 1:57:57
Sorry for my terrible english...
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