1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
| | #define _GNU_SOURCE
#include <net/if.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <string.h>
#include <errno.h>
#include "syscall.h"
char *if_indextoname(unsigned index, char *name)
{
struct ifreq ifr;
int fd, r;
if ((fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC, 0)) < 0) return 0;
ifr.ifr_ifindex = index;
r = ioctl(fd, SIOCGIFNAME, &ifr);
__syscall(SYS_close, fd);
if (r < 0) {
if (errno == ENODEV) errno = ENXIO;
return 0;
}
return strncpy(name, ifr.ifr_name, IF_NAMESIZE);
}
|