#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, 0)) < 0) return 0;
+ 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);
- return r < 0 ? 0 : strncpy(name, ifr.ifr_name, IF_NAMESIZE);
+ if (r < 0) {
+ if (errno == ENODEV) errno = ENXIO;
+ return 0;
+ }
+ return strncpy(name, ifr.ifr_name, IF_NAMESIZE);
}