Re: consistent ioctl for getting all net interfaces?

[joshk@triplehelix.org (Joshua Kwan)]

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On Sun, May 23, 2004 at 04:20:57PM +0100, Tigran Aivazian wrote:
> Note that a more simple solution is also possible but is less portable
> (because will depend on glibc version).

That uses if_nameindex, right? It's also affected by kernel version.

> 		if(ioctl(fd, SIOCGIFCONF, &ifc) < 0) {
> 			DPRINTF("ioctl(SIOCGIFCONF), errno=%d (%s)\n",
> 					errno, strerror(errno));
> 			if (ifc.ifc_buf)
> 				free(ifc.ifc_buf);
> 			ret = TERR_IOCTL;
> 			goto outclose;
> 		}

As I said, when I tried SIOCGIFCONF, results varied..
I think it's slightly more reliable to just keep using /proc/net/dev for
now. (My parser is more robust than viro's ;))

I took a look at the net-tools ifconfig source and saw that it also
parsed /proc/net/dev to pick up what SIOCGIFCONF didn't. Shudder.

-- 
Joshua Kwan

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