linux-user: support the SIOCGIFINDEX ioctl

Add a definition of the SIOCGIFINDEX ioctl, allowing its use by target
programs.
Signed-off-by: NPaul Burton <paul@archlinuxmips.org>
Signed-off-by: NRiku Voipio <riku.voipio@linaro.org>

linux-user/ioctls.h

@@ -118,6 +118,7 @@
   IOCTL(SIOCSIFMEM, IOC_W, MK_PTR(MK_STRUCT(STRUCT_ptr_ifreq)))
   IOCTL(SIOCADDMULTI, IOC_W, MK_PTR(MK_STRUCT(STRUCT_sockaddr_ifreq)))
   IOCTL(SIOCDELMULTI, IOC_W, MK_PTR(MK_STRUCT(STRUCT_sockaddr_ifreq)))
+  IOCTL(SIOCGIFINDEX, IOC_W | IOC_R, MK_PTR(MK_STRUCT(STRUCT_sockaddr_ifreq)))
   IOCTL(SIOCSIFLINK, 0, TYPE_NULL)
   IOCTL_SPECIAL(SIOCGIFCONF, IOC_W | IOC_R, do_ioctl_ifconf,
                 MK_PTR(MK_STRUCT(STRUCT_ifconf)))

linux-user/syscall_defs.h

@@ -865,6 +865,7 @@ struct target_pollfd {
 #define TARGET_SIOCSIFSLAVE    0x8930
 #define TARGET_SIOCADDMULTI    0x8931          /* Multicast address lists      */
 #define TARGET_SIOCDELMULTI    0x8932
+#define TARGET_SIOCGIFINDEX    0x8933
 
 /* Bridging control calls */
 #define TARGET_SIOCGIFBR       0x8940          /* Bridging support             */