65     static int ip_fd = 0;  in tap_alloc()  local
84     if( ip_fd )  in tap_alloc()
85        close(ip_fd);  in tap_alloc()
87     ip_fd = RETRY_ON_EINTR(open("/dev/udp", O_RDWR, 0));  in tap_alloc()
88     if (ip_fd < 0) {  in tap_alloc()
135     if (ioctl (ip_fd, I_POP, NULL) < 0)  in tap_alloc()
137     if (ioctl (ip_fd, I_PUSH, "arp") < 0)  in tap_alloc()
153     if((ip_muxid = ioctl(ip_fd, I_LINK, if_fd)) < 0){  in tap_alloc()
158     if ((arp_muxid = ioctl (ip_fd, link_type, arp_fd)) < 0)  in tap_alloc()
168     if (ioctl (ip_fd, SIOCSLIFMUXID, &ifr) < 0)  in tap_alloc()
170       ioctl (ip_fd, I_PUNLINK , arp_muxid);  in tap_alloc()
171       ioctl (ip_fd, I_PUNLINK, ip_muxid);  in tap_alloc()