Comments on: Get list of interfaces using SIOCGIFCONF ioctl

By: Neo

Neo — Wed, 11 Nov 2009 00:53:26 +0000

You must use < for < symbol. Similarly > for > symbol. It is HTML way which we can’t be avoided for now.

By: Ganesh

Ganesh — Tue, 27 Oct 2009 07:32:16 +0000

The code within the for loop in ‘main’ function is also missing:
char ip_addr [ INET_ADDRSTRLEN ] ; struct sockaddr_in *b = (struct sockaddr_in *) &(ifreqs[i].ifr_addr) ;

printf(“\t%-10s\t%s\n”, ifreqs[i].ifr_name, inet_ntop(AF_INET, & b->sin_addr, ip_addr, sizeof ip_addr));

By: Ganesh

Ganesh — Tue, 27 Oct 2009 07:29:52 +0000

I am sorry, somehow none of the header file names are visible in the comment that I posted.

Anyway, I only included ‘arpa/inet.h’ header file apart from what was already there in the code.

Warm Regards,
Ganesh

By: Ganesh

Ganesh — Tue, 27 Oct 2009 07:26:16 +0000

Hi Neo,

Thanks for this article. It cleared up all my questions on using ioctl function call with SIOCGIFCONF request.

I have made a small modification to your code. It now prints the IP address of all the interfaces configured in the computer.

#include

Code inside main loop:

char ip_addr [ INET_ADDRSTRLEN ] ; struct sockaddr_in *b = (struct sockaddr_in *) &(ifreqs[i].ifr_addr) ;

printf(”\t%-10s\t%s\n”, ifreqs[i].ifr_name, inet_ntop(AF_INET, & b->sin_addr, ip_addr, sizeof ip_addr));