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
if_nametoindex(const char * name)8 unsigned if_nametoindex(const char *name)
9 {
10 struct ifreq ifr;
11 int fd, r;
12 #ifdef __LITEOS_A__
13 if ((fd = socket(AF_INET, SOCK_DGRAM|SOCK_CLOEXEC, 0)) < 0) return 0;
14 #else
15 if ((fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC, 0)) < 0) return 0;
16 #endif
17 strncpy(ifr.ifr_name, name, sizeof ifr.ifr_name);
18 r = ioctl(fd, SIOCGIFINDEX, &ifr);
19 __syscall(SYS_close, fd);
20 return r < 0 ? 0 : ifr.ifr_ifindex;
21 }
22