| 1 | #define _GNU_SOURCE |
| 2 | #include <net/if.h> |
| 3 | #include <sys/socket.h> |
| 4 | #include <sys/ioctl.h> |
| 5 | #include <string.h> |
| 6 | #include "syscall.h" |
| 7 | |
| 8 | unsigned if_nametoindex(const char *name) |
| 9 | { |
| 10 | struct ifreq ifr; |
| 11 | int fd, r; |
| 12 | |
| 13 | if ((fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC, 0)) < 0) return 0; |
| 14 | strncpy(ifr.ifr_name, name, sizeof ifr.ifr_name); |
| 15 | r = ioctl(fd, SIOCGIFINDEX, &ifr); |
| 16 | __syscall(SYS_close, fd); |
| 17 | return r < 0 ? 0 : ifr.ifr_ifindex; |
| 18 | } |