feat: Added ifconf struct

Author: Brijeshkrishna

src/unix/linux_like/linux/mod.rs

@@ -792,6 +792,19 @@ s_no_extra_traits! {
         pub ifr_ifru: ::sockaddr,
     }
 
+    pub union __c_anonymous_ifc_ifcu {
+        ifcu_buf: *mut ::c_char,
+        ifcu_req: *mut ::ifreq,
+    }
+
+    /*  Structure used in SIOCGIFCONF request.  Used to retrieve interface
+        configuration for machine (useful for programs which must know all
+        networks accessible).  */
+    pub struct ifconf {
+        pub ifc_len: ::c_int,       /* Size of buffer.  */
+        pub ifc_ifcu: __c_anonymous_ifc_ifcu,
+    }
+
     pub struct hwtstamp_config {
         pub flags: ::c_int,
         pub tx_type: ::c_int,