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Difference in behaviour between getifaddrs() and ioctl(SIOCGIFCONF)


Hello,

I've seen an issue when using getifaddrs() using Cygwin 1.7.x (snapshot build from 2010-11-24, shortly after the ARP fixes from Corinna). Operating System is Windows 7 x64_86 Ultimate.

When I use getifaddrs() I get a list of interface names, some are appended with ":1".

Getting the list with ioctl(SIOCGIFCONF) provides a different list of names, where interface names only differ sometimes by ":1".

The list from ioctl() is correct, that from getifaddrs() is incorrect, in that the name cannot be used to resolve the HWADDR, SIOCGIFFRNDLYNAM with ioctl().

Using getifaddrs():
device: {4ED54D4E-1024-4BDF-A926-67D2895D2DC4}; ioctl(SIOCGIFFRNDLYNAM)=0 Local Area Connection 4
device: {A045DC0F-A979-49B3-954C-D0678365FF26}:1; ioctl(SIOCGIFFRNDLYNAM)=-1
device: {4EB69B61-C791-434A-8FCE-8F4859EA8DFC}; ioctl(SIOCGIFFRNDLYNAM)=0 Local Area Connection 3
device: {85C2CEC7-A2B9-47D4-9A50-D63E9F9ED007}; ioctl(SIOCGIFFRNDLYNAM)=0 Bluetooth Network Connection
device: {56D2E68A-4173-4117-A719-65123B973C65}:1; ioctl(SIOCGIFFRNDLYNAM)=-1
device: {7E5203E8-97DE-4822-9A2E-380BD258D97E}:1; ioctl(SIOCGIFFRNDLYNAM)=-1
device: {8424F604-4FAE-4541-9D8E-7B0A583A0956}:1; ioctl(SIOCGIFFRNDLYNAM)=-1
device: {846EE342-7039-11DE-9D20-806E6F6E6963}:1; ioctl(SIOCGIFFRNDLYNAM)=-1



Using ioctl(SIOCGIFCONF):
device: {4ED54D4E-1024-4BDF-A926-67D2895D2DC4}; ioctl(SIOCGIFFRNDLYNAM)=0 Local Area Connection 4
device: {A045DC0F-A979-49B3-954C-D0678365FF26}; ioctl(SIOCGIFFRNDLYNAM)=0 Bluetooth Network Connection 2
device: {4EB69B61-C791-434A-8FCE-8F4859EA8DFC}; ioctl(SIOCGIFFRNDLYNAM)=0 Local Area Connection 3
device: {85C2CEC7-A2B9-47D4-9A50-D63E9F9ED007}; ioctl(SIOCGIFFRNDLYNAM)=0 Bluetooth Network Connection
device: {56D2E68A-4173-4117-A719-65123B973C65}; ioctl(SIOCGIFFRNDLYNAM)=0 Local Area Connection
device: {7E5203E8-97DE-4822-9A2E-380BD258D97E}; ioctl(SIOCGIFFRNDLYNAM)=0 VMware Network Adapter VMnet1
device: {8424F604-4FAE-4541-9D8E-7B0A583A0956}; ioctl(SIOCGIFFRNDLYNAM)=0 VMware Network Adapter VMnet8
device: {846EE342-7039-11DE-9D20-806E6F6E6963}; ioctl(SIOCGIFFRNDLYNAM)=0 Loopback Pseudo-Interface 1



My control panel shows only interfaces * Bluetooth Network Connection 2 * Local Area Connection * VMware Network Adapter VMnet1 * VMware Network Adapter VMnet8


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