Re: C and/or ioctl question

[Stephen Waters <swaters@xxxxxxxxxx>]

On 09 Aug 2001 03:43:13 +1000, James Morris wrote:
> On 8 Aug 2001, Stephen Waters wrote:
> 
> > hi, I've been studying the net-tools ifconfig implementation a bit in my
> > efforts to better learn C and ioctl for Linux.
> >
> 
> > int main () {
> >    struct ifconf ifc;
> >    int skfd;
> >    skfd = socket(AF_INET, SOCK_DGRAM, 0);
> >    if (ioctl(skfd, SIOCGIFCONF, &ifc) < 0) {
> 
> 
> You need to set up the ifconf structure first and allocate enough memory
> in it for a payload of ifreq structures to be returned from the kernel.
> 
> Have a look at if_readconf() in net-tools/lib/interface.c

Thanks!
-sw