Vendor dependencies for 0.3.0 release

vendor/nix/test/sys/test_memfd.rs

@@ -0,0 +1,20 @@
+#[test]
+fn test_memfd_create() {
+    use nix::sys::memfd::memfd_create;
+    use nix::sys::memfd::MFdFlags;
+    use nix::unistd::lseek;
+    use nix::unistd::read;
+    use nix::unistd::{write, Whence};
+
+    let fd =
+        memfd_create("test_memfd_create_name", MFdFlags::MFD_CLOEXEC).unwrap();
+    let contents = b"hello";
+    assert_eq!(write(&fd, contents).unwrap(), 5);
+
+    lseek(&fd, 0, Whence::SeekSet).unwrap();
+
+    let mut buf = vec![0_u8; contents.len()];
+    assert_eq!(read(&fd, &mut buf).unwrap(), 5);
+
+    assert_eq!(contents, buf.as_slice());
+}