Suffix Socket::(set_)tos with v4

To indicate it an option for IPv4 sockets.

Author: Thomasdezeeuw

src/socket.rs

@@ -1165,8 +1165,8 @@ impl Socket {
     ///
     /// [`SOCK_RAW`]: Type::RAW
     /// [raw(7)]: https://man7.org/linux/man-pages/man7/raw.7.html
-    /// [`IP_TOS`]: Socket::set_tos
     /// [`IP_TTL`]: Socket::set_ttl_v4
+    /// [`IP_TOS`]: Socket::set_tos_v4
     #[cfg_attr(
         any(target_os = "fuchsia", target_os = "illumos", target_os = "solaris"),
         allow(rustdoc::broken_intra_doc_links)
@@ -1562,26 +1562,26 @@ impl Socket {
         target_os = "illumos",
         target_os = "haiku",
     )))]
-    pub fn set_tos(&self, tos: u32) -> io::Result<()> {
+    pub fn set_tos_v4(&self, tos: u32) -> io::Result<()> {
         unsafe { setsockopt(self.as_raw(), sys::IPPROTO_IP, sys::IP_TOS, tos as c_int) }
     }
 
     /// Get the value of the `IP_TOS` option for this socket.
     ///
-    /// For more information about this option, see [`set_tos`].
+    /// For more information about this option, see [`set_tos_v4`].
     ///
     /// NOTE: <https://docs.microsoft.com/en-us/windows/win32/winsock/ipproto-ip-socket-options>
     /// documents that not all versions of windows support `IP_TOS`.
     ///
-    /// [`set_tos`]: Socket::set_tos
+    /// [`set_tos_v4`]: Socket::set_tos_v4
     #[cfg(not(any(
         target_os = "fuchsia",
         target_os = "redox",
         target_os = "solaris",
         target_os = "illumos",
         target_os = "haiku",
     )))]
-    pub fn tos(&self) -> io::Result<u32> {
+    pub fn tos_v4(&self) -> io::Result<u32> {
         unsafe {
             getsockopt::<c_int>(self.as_raw(), sys::IPPROTO_IP, sys::IP_TOS).map(|tos| tos as u32)
         }

tests/socket.rs

@@ -1410,7 +1410,7 @@ test!(IPv4 ttl_v4, set_ttl_v4(40));
     target_os = "illumos",
     target_os = "haiku",
 )))]
-test!(IPv4 tos, set_tos(96));
+test!(IPv4 tos_v4, set_tos_v4(96));
 
 #[cfg(not(any(
     target_os = "dragonfly",