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#define _GNU_SOURCE #include <net/if.h> #include <sys/socket.h> #include <sys/ioctl.h> #include <string.h>
#include <unsupported_api.h>
#include "syscall.h" unsigned if_nametoindex(const char *name) { struct ifreq ifr; int fd, r;
unsupported_api(__FUNCTION__);
if ((fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC, 0)) < 0) return 0;
strncpy(ifr.ifr_name, name, sizeof ifr.ifr_name); r = ioctl(fd, SIOCGIFINDEX, &ifr); __syscall(SYS_close, fd);
return r < 0 ? 0 : ifr.ifr_ifindex;
}