Add cfmakesane() on FreeBSD

Author: valpackett

CHANGELOG.md

@@ -70,6 +70,8 @@ This project adheres to [Semantic Versioning](http://semver.org/).
   ([#835](https://github.com/nix-rust/nix/pull/835))
 - Added `EVFILT_EMPTY`, `EVFILT_PROCDESC` and `EVFILT_SENDFILE` on FreeBSD.
   ([#825](https://github.com/nix-rust/nix/pull/825))
+- Exposed `termios::cfmakesane` on FreeBSD.
+  ([#825](https://github.com/nix-rust/nix/pull/825))
 
 ### Changed
 - Exposed the `mqueue` module for all supported operating systems.

src/sys/termios.rs

@@ -1022,6 +1022,19 @@ pub fn cfmakeraw(termios: &mut Termios) {
     termios.update_wrapper();
 }
 
+/// Configures the port to "sane" mode (like the configuration of a newly created terminal) (see
+/// [tcsetattr(3)](https://www.freebsd.org/cgi/man.cgi?query=tcsetattr)).
+///
+/// Note that this is a non-standard function, available on FreeBSD.
+#[cfg(target_os = "freebsd")]
+pub fn cfmakesane(termios: &mut Termios) {
+    let inner_termios = unsafe { termios.get_libc_termios_mut() };
+    unsafe {
+        libc::cfmakesane(inner_termios);
+    }
+    termios.update_wrapper();
+}
+
 /// Return the configuration of a port
 /// [tcgetattr(3p)](http://pubs.opengroup.org/onlinepubs/9699919799/functions/tcgetattr.html)).
 ///