chore: deprecate IpTos in favor of Ipv4Tos (#2465)

* chore: deprecate IpTos in favor of Ipv4Tos

* chore: allow deprecated in its macro

* try again

* refactor: allow(deprecated) in set/getsockopt_impl!()

changelog/2465.changed.md

@@ -0,0 +1 @@
+Socket option `IpTos` has been renamed to `Ipv4Tos`, the old symbol is deprecated since 0.30.0

src/sys/socket/sockopt.rs

@@ -44,6 +44,7 @@ const TCP_CA_NAME_MAX: usize = 16;
 ///    `bool`, `SetUsize` for `usize`, etc.).
 macro_rules! setsockopt_impl {
     ($name:ident, $level:expr, $flag:path, $ty:ty, $setter:ty) => {
+        #[allow(deprecated)] // to allow we have deprecated socket option
         impl SetSockOpt for $name {
             type Val = $ty;
 
@@ -89,6 +90,7 @@ macro_rules! setsockopt_impl {
 ///    `bool`, `GetUsize` for `usize`, etc.).
 macro_rules! getsockopt_impl {
     ($name:ident, $level:expr, $flag:path, $ty:ty, $getter:ty) => {
+        #[allow(deprecated)] // to allow we have deprecated socket option
         impl GetSockOpt for $name {
             type Val = $ty;
 
@@ -404,6 +406,19 @@ sockopt_impl!(
 );
 #[cfg(any(linux_android, target_os = "freebsd"))]
 #[cfg(feature = "net")]
+sockopt_impl!(
+    #[deprecated(since = "0.30.0", note = "Use Ipv4Tos instead")]
+    #[cfg_attr(docsrs, doc(cfg(feature = "net")))]
+    /// Set or receive the Type-Of-Service (TOS) field that is
+    /// sent with every IP packet originating from this socket
+    IpTos,
+    Both,
+    libc::IPPROTO_IP,
+    libc::IP_TOS,
+    libc::c_int
+);
+#[cfg(any(linux_android, target_os = "freebsd"))]
+#[cfg(feature = "net")]
 sockopt_impl!(
     #[cfg_attr(docsrs, doc(cfg(feature = "net")))]
     /// Set or receive the Type-Of-Service (TOS) field that is