lo0 not in ioctl( SIOCGIFCONF )
rehsack at web.de
Mon Jul 21 21:31:03 UTC 2008
Brooks Davis wrote:
>> maybe this question is better asked in this list ...
>> I was searching why ports/net/p5-Net-Interface was not working as
>> expected and found some reasons. Most of them I can answer by implementing
>> some test code as attached, but now I'm wondering why em0 is shown twice
>> and lo0 is not included.
>> The same situation on another machine ..
> The attachment didn't make it through.
> -- Brooks
Copy&Paste starts here ...
#define _SIZEOF_ADDR_IFREQ(ifr) \
((ifr).ifr_addr.sa_len > sizeof(struct sockaddr) ? \
(sizeof(struct ifreq) - sizeof(struct sockaddr) + \
(ifr).ifr_addr.sa_len) : sizeof(struct ifreq))
struct ifconf ifc;
struct ifreq *ifr, *lifr;
unsigned int n;
fd = socket( AF_INET, SOCK_STREAM, 0 );
n = 3;
ifr = calloc( ifc.ifc_len, sizeof(*ifr) );
n *= 2;
ifr = realloc( ifr, sizeof(*ifr) * n );
bzero( ifr, sizeof(*ifr) * n );
ifc.ifc_req = ifr;
ifc.ifc_len = n * sizeof(*ifr);
} while( ( ioctl( fd, SIOCGIFCONF, &ifc ) == -1 ) || ( ifc.ifc_len
== n * sizeof(*ifr)) );
lifr = (struct ifreq *)&ifc.ifc_buf[ifc.ifc_len];
while (ifr < lifr)
printf( "%s\n", ifr->ifr_name );
ifr = (struct ifreq *)(((char *)ifr) + _SIZEOF_ADDR_IFREQ(*ifr));
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