From: Andrey Repin <anrdaemon@yandex.ru>
To: Ken Brown <kbrown@cornell.edu>, cygwin@cygwin.com
Subject: Re: Problems with getifaddrs
Date: Tue, 27 Jul 2021 02:04:08 +0300 [thread overview]
Message-ID: <529122968.20210727020408@yandex.ru> (raw)
In-Reply-To: <05d378e2-dd26-9ca1-2888-22015c4c63bd@cornell.edu>
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...
next prev parent reply other threads:[~2021-07-26 23:05 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-07-26 15:15 Ken Brown
2021-07-26 23:04 ` Andrey Repin [this message]
2021-07-29 14:43 ` Ken Brown
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