Expose sendfile on supported BSDs

Author: Susurrus

src/sys/mod.rs

@@ -18,7 +18,12 @@ pub mod memfd;
 #[macro_use]
 pub mod ioctl;
 
-#[cfg(any(target_os = "linux", target_os = "android"))]
+#[cfg(any(target_os = "android",
+          target_os = "dragonfly",
+          target_os = "freebsd",
+          target_os = "ios",
+          target_os = "linux",
+          target_os = "macos"))]
 pub mod sendfile;
 
 pub mod signal;