Is there a way in Linux, using C code, to get the same information that “ifconfig eth0” would return? I’m interested in things like IP address, link status, and MAC address.
Here’s sample output from ifconfig:
eth0 Link encap:Ethernet HWaddr 00:0F:20:CF:8B:42 inet addr:217.149.127.10 Bcast:217.149.127.63 Mask:255.255.255.192 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:2472694671 errors:1 dropped:0 overruns:0 frame:0 TX packets:44641779 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:1761467179 (1679.8 Mb) TX bytes:2870928587 (2737.9 Mb) Interrupt:28
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Answer
Yes, ifconfig
itself is written in C. 🙂 See: http://cvsweb.netbsd.org/bsdweb.cgi/src/sbin/ifconfig/ifconfig.c?rev=1.169&content-type=text/x-cvsweb-markup
Do man netdevice
to see the details (on Linux). You use the ioctl()
system call.