Add sock_extended_err and associated constants from errqueue.h

sock_extended_err is a struct returned as a control message when the sockopt
IP_RECVERR is set, when recvmsg has the MSG_ERRQUEUE flag set.  IP_RECVERR and
MSG_ERRQUEUE are constants both already defined here.

Author: mcpherrinm

libc-test/build.rs

@@ -2189,6 +2189,7 @@ fn test_linux(target: &str) {
         cfg:
         "asm/mman.h",
         "linux/dccp.h",
+        "linux/errqueue.h",
         "linux/falloc.h",
         "linux/fs.h",
         "linux/futex.h",

src/unix/linux_like/mod.rs

@@ -199,6 +199,16 @@ s! {
         pub msg_hdr: ::msghdr,
         pub msg_len: ::c_uint,
     }
+
+    pub struct sock_extended_err {
+        pub ee_errno: u32,
+        pub ee_origin: u8,
+        pub ee_type: u8,
+        pub ee_code: u8,
+        pub ee_pad: u8,
+        pub ee_info: u32,
+        pub ee_data: u32
+    }
 }
 
 s_no_extra_traits! {
@@ -1189,6 +1199,13 @@ pub const ARPHRD_IEEE802154: u16 = 804;
 pub const ARPHRD_VOID: u16 = 0xFFFF;
 pub const ARPHRD_NONE: u16 = 0xFFFE;
 
+pub const SO_EE_ORIGIN_NONE: u8 = 0;
+pub const SO_EE_ORIGIN_LOCAL: u8 = 1;
+pub const SO_EE_ORIGIN_ICMP: u8 = 2;
+pub const SO_EE_ORIGIN_ICMP6: u8 = 3;
+pub const SO_EE_ORIGIN_TXSTATUS: u8 = 4;
+pub const SO_EE_ORIGIN_TIMESTAMPING: u8 = SO_EE_ORIGIN_TXSTATUS;
+
 const_fn! {
     {const} fn CMSG_ALIGN(len: usize) -> usize {
         len + ::mem::size_of::<usize>() - 1 & !(::mem::size_of::<usize>() - 1)
@@ -1294,6 +1311,10 @@ f! {
     pub fn IPTOS_ECN(x: u8) -> u8 {
         x & ::IPTOS_ECN_MASK
     }
+
+    pub fn SO_EE_OFFENDER(ee: *const ::sock_extended_err) -> *mut ::sockaddr {
+        ee.offset(1) as *mut ::sockaddr
+    }
 }
 
 extern "C" {