introduces FreeBSD's SO_TS_CLOCK into net::sys::socket::sockopt. (#2093)

* introduces FreeBSD's SO_TS_CLOCK into net::sys::socket::sockopt.

close GH-2058.

* CHANGELOG entry

* changes from feedback

Author: devnexen

CHANGELOG.md

@@ -34,6 +34,8 @@ This project adheres to [Semantic Versioning](https://semver.org/).
 - Added `MSG_WAITFORONE` to `MsgFlags` on Android, Fuchsia, Linux, NetBSD,
   FreeBSD, OpenBSD, and Solaris.
   ([#2014](https://github.com/nix-rust/nix/pull/2014))
+- Added `SO_TS_CLOCK` for FreeBSD to `nix::sys::socket::sockopt`.
+  ([#2093](https://github.com/nix-rust/nix/pull/2093))
 
 ### Changed
 

src/sys/socket/sockopt.rs

@@ -711,6 +711,16 @@ sockopt_impl!(
     libc::SO_TIMESTAMPNS,
     bool
 );
+#[cfg(target_os = "freebsd")]
+sockopt_impl!(
+    /// Sets a specific timestamp format instead of the classic `SCM_TIMESTAMP`,
+    /// to follow up after `SO_TIMESTAMP` is set.
+    TsClock,
+    Both,
+    libc::SOL_SOCKET,
+    libc::SO_TS_CLOCK,
+    i32
+);
 #[cfg(any(target_os = "android", target_os = "linux"))]
 #[cfg(feature = "net")]
 sockopt_impl!(