3 #include <sys/socket.h>
9 char *if_indextoname(unsigned index, char *name)
14 if ((fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC, 0)) < 0) return 0;
15 ifr.ifr_ifindex = index;
16 r = ioctl(fd, SIOCGIFNAME, &ifr);
17 __syscall(SYS_close, fd);
19 if (errno == ENODEV) errno = ENXIO;
22 return strncpy(name, ifr.ifr_name, IF_NAMESIZE);