On Thu, 26 Aug 2010 11:17:51 -0400
"Loke, Chetan" <Chetan.Loke@xxxxxxxxxxxx> wrote:
> What if we extend 'IFNAMSIZ'(beyond 16 chars. Older apps don't need to
> worry because they have been working w/ 16 chars anyways) and also get
> ifalias to work in udev(Or is ifalias a bad idea?)?
>
> Chetan
>
That is non-starter for the ioctl() style interface.
struct ifreq {
#define IFHWADDRLEN 6
union
{
char ifrn_name[IFNAMSIZ]; /* if name, e.g. "en0" */
} ifr_ifrn;
union {
struct sockaddr ifru_addr;
struct sockaddr ifru_dstaddr;
struct sockaddr ifru_broadaddr;
struct sockaddr ifru_netmask;
struct sockaddr ifru_hwaddr;
short ifru_flags;
int ifru_ivalue;
int ifru_mtu;
struct ifmap ifru_map;
char ifru_slave[IFNAMSIZ]; /* Just fits the size */
char ifru_newname[IFNAMSIZ];
void __user * ifru_data;
struct if_settings ifru_settings;
} ifr_ifru;
};
Applications do:
strncpy(ifr.ifr_name, "my name", IFNAMSIZ);
ioctl(fd, SIOCGHWADDR, &ifr)
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