blob: 419931f9f35311ab3da34c5633c47e58b82d133e [file] [log] [blame]
#define _GNU_SOURCE
#include <net/if.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <string.h>
#include "syscall.h"
unsigned if_nametoindex(const char *name)
{
struct ifreq ifr;
int fd, r;
if ((fd = socket(AF_UNIX, SOCK_DGRAM, 0)) < 0) return -1;
strncpy(ifr.ifr_name, name, sizeof ifr.ifr_name);
r = ioctl(fd, SIOCGIFINDEX, &ifr);
__syscall(SYS_close, fd);
return r < 0 ? r : ifr.ifr_ifindex;
}