（C，Linux）的了解，如果一个网络接口是无线或有线 [英] (C, Linux) Knowing if a network interface is wireless or wired

问题描述

我有一个具有两个分开的部分的程序：其中一个应执行时所述网络接口是无线LAN而另一个时，它的一个有线LAN连接。我怎么能知道我的节目里面？我应该使用什么函数来获得这些信息？

I have a program that has two separate sections: one of them should be executed when the network interface is wireless LAN and the other one when it's a wired LAN connection. How can I know that inside of my program? What function should I use to get that information?

推荐答案

您可以在命令行中使用iwconfig命令：

You can use the iwconfig command from the command line:

$ iwconfig
lo        no wireless extensions.
eth0      no wireless extensions.

如果您需要使用它从C，如上@不透明的链接解释说，获得源代码，或者使用strace的，看看哪个的ioctl（），你需要使用：

If you need to use it from C, as @opaque's link above explains, get the sources or use strace to see which ioctls() you need to use:

ioctl(3, SIOCGIWNAME, 0x7fff82c0d040)   = -1 EOPNOTSUPP (Operation not supported)
ioctl(3, SIOCGIFFLAGS, {ifr_name="lo", ifr_flags=IFF_UP|IFF_LOOPBACK|IFF_RUNNING}) = 0
write(2, "lo        no wireless extensions"..., 35lo        no wireless extensions.

) = 35
ioctl(3, SIOCGIWNAME, 0x7fff82c0d040)   = -1 EOPNOTSUPP (Operation not supported)
ioctl(3, SIOCGIFFLAGS, {ifr_name="eth0", ifr_flags=IFF_UP|IFF_BROADCAST|IFF_RUNNING|IFF_MULTICAST}) = 0
write(2, "eth0      no wireless extensions"..., 35eth0      no wireless extensions.

) = 35

请参阅 SIOCGIWNAME使用：

#define SIOCGIWNAME 0x8B01 /* get name == wireless protocol */
/* SIOCGIWNAME is used to verify the presence of Wireless Extensions.
* Common values : "IEEE 802.11-DS", "IEEE 802.11-FH", "IEEE 802.11b"...

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