struct if_nameindex* if_nameindex() {
struct ifnameindexctx _ctx, *ctx = &_ctx;
struct if_nameindex *ifs = 0, *d;
struct ifnamemap* s;
char* p;
int i;
int cs;
pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &cs);
memset(ctx, 0, sizeof(*ctx));
if (__rtnetlink_enumerate(AF_UNSPEC, AF_INET, netlink_msg_to_nameindex, ctx) <
0)
goto err;
ifs = malloc(sizeof(struct if_nameindex[ctx->num + 1]) + ctx->str_bytes);
if (!ifs)
goto err;
p = (char*)(ifs + ctx->num + 1);
for (i = ctx->num, d = ifs, s = ctx->list; i; i--, s++, d++) {
d->if_index = s->index;
d->if_name = p;
memcpy(p, s->name, s->namelen);
p += s->namelen;
*p++ = 0;
}
d->if_index = 0;
d->if_name = 0;
err:
pthread_setcancelstate(cs, 0);
free(ctx->list);
errno = ENOBUFS;
return ifs;
}
int getifaddrs(struct ifaddrs **ifap)
{
struct ifaddrs_ctx _ctx, *ctx = &_ctx;
int r;
memset(ctx, 0, sizeof *ctx);
r = __rtnetlink_enumerate(AF_UNSPEC, AF_UNSPEC, netlink_msg_to_ifaddr, ctx);
if (r == 0) *ifap = &ctx->first->ifa;
else freeifaddrs(&ctx->first->ifa);
return r;
}
