Add FileTypeUnix trait to add unix special file types

3 files changed, 24 insertions, 2 deletions

diff --git a/src/libstd/sys/unix/ext/fs.rs b/src/libstd/sys/unix/ext/fs.rs
index 97703b83056..4ee790b0161 100644
--- a/src/libstd/sys/unix/ext/fs.rs
+++ b/src/libstd/sys/unix/ext/fs.rs
@@ -16,6 +16,7 @@ use prelude::v1::*;
 
 use fs::{self, Permissions, OpenOptions};
 use io;
+use libc;
 use os::raw::c_long;
 use os::unix::raw;
 use path::Path;
@@ -178,6 +179,27 @@ impl MetadataExt for fs::Metadata {
     }
 }
 
+/// Add special unix types (block/char device, fifo and socket)
+#[unstable(feature = "file_type_ext", reason = "recently added API")]
+pub trait FileTypeExt {
+    /// Returns whether this file type is a block device.
+    fn is_block_device(&self) -> bool;
+    /// Returns whether this file type is a char device.
+    fn is_char_device(&self) -> bool;
+    /// Returns whether this file type is a fifo.
+    fn is_fifo(&self) -> bool;
+    /// Returns whether this file type is a socket.
+    fn is_socket(&self) -> bool;
+}
+
+#[unstable(feature = "file_type_ext", reason = "recently added API")]
+impl FileTypeExt for fs::FileType {
+    fn is_block_device(&self) -> bool { self.as_inner().is(libc::S_IFBLK) }
+    fn is_char_device(&self) -> bool { self.as_inner().is(libc::S_IFCHR) }
+    fn is_fifo(&self) -> bool { self.as_inner().is(libc::S_IFIFO) }
+    fn is_socket(&self) -> bool { self.as_inner().is(libc::S_IFSOCK) }
+}
+
 /// Unix-specific extension methods for `fs::DirEntry`
 #[stable(feature = "dir_entry_ext", since = "1.1.0")]
 pub trait DirEntryExt {
diff --git a/src/libstd/sys/unix/ext/mod.rs b/src/libstd/sys/unix/ext/mod.rs
index 48c77480899..f7dee1a8f35 100644
--- a/src/libstd/sys/unix/ext/mod.rs
+++ b/src/libstd/sys/unix/ext/mod.rs
@@ -45,7 +45,7 @@ pub mod prelude {
     #[doc(no_inline)] #[stable(feature = "rust1", since = "1.0.0")]
     pub use super::ffi::{OsStrExt, OsStringExt};
     #[doc(no_inline)]
-    pub use super::fs::{PermissionsExt, OpenOptionsExt, MetadataExt};
+    pub use super::fs::{PermissionsExt, OpenOptionsExt, MetadataExt, FileTypeExt};
     #[doc(no_inline)]
     pub use super::fs::{DirEntryExt};
     #[doc(no_inline)] #[stable(feature = "rust1", since = "1.0.0")]
diff --git a/src/libstd/sys/unix/fs.rs b/src/libstd/sys/unix/fs.rs
index 128284834ab..7396d088ade 100644
--- a/src/libstd/sys/unix/fs.rs
+++ b/src/libstd/sys/unix/fs.rs
@@ -113,7 +113,7 @@ impl FileType {
     pub fn is_file(&self) -> bool { self.is(libc::S_IFREG) }
     pub fn is_symlink(&self) -> bool { self.is(libc::S_IFLNK) }
 
-    fn is(&self, mode: mode_t) -> bool { self.mode & libc::S_IFMT == mode }
+    pub fn is(&self, mode: mode_t) -> bool { self.mode & libc::S_IFMT == mode }
 }
 
 impl FromInner<raw::mode_t> for FilePermissions {