return x;
}
void dwrite (char *path, char *buf, int len) {
int fd;
fd = open(path, O_RDWR|O_CREAT|O_TRUNC, 0600);
write(fd, buf, len);
close(fd);
static int iface_addr(const char * name, in_addr_t * result) {
int r, s;
struct ifreq ifr;