Initial import of same-file-1.0.6.
Bug: 155309706
Change-Id: Iaa5474ae70e5c8533693d858e824d2c070410571
diff --git a/src/unix.rs b/src/unix.rs
new file mode 100644
index 0000000..fb3d19f
--- /dev/null
+++ b/src/unix.rs
@@ -0,0 +1,112 @@
+use std::fs::{File, OpenOptions};
+use std::hash::{Hash, Hasher};
+use std::io;
+use std::os::unix::fs::MetadataExt;
+use std::os::unix::io::{AsRawFd, FromRawFd, IntoRawFd, RawFd};
+use std::path::Path;
+
+#[derive(Debug)]
+pub struct Handle {
+ file: Option<File>,
+ // If is_std is true, then we don't drop the corresponding File since it
+ // will close the handle.
+ is_std: bool,
+ dev: u64,
+ ino: u64,
+}
+
+impl Drop for Handle {
+ fn drop(&mut self) {
+ if self.is_std {
+ // unwrap() will not panic. Since we were able to open an
+ // std stream successfully, then `file` is guaranteed to be Some()
+ self.file.take().unwrap().into_raw_fd();
+ }
+ }
+}
+
+impl Eq for Handle {}
+
+impl PartialEq for Handle {
+ fn eq(&self, other: &Handle) -> bool {
+ (self.dev, self.ino) == (other.dev, other.ino)
+ }
+}
+
+impl AsRawFd for crate::Handle {
+ fn as_raw_fd(&self) -> RawFd {
+ // unwrap() will not panic. Since we were able to open the
+ // file successfully, then `file` is guaranteed to be Some()
+ self.0.file.as_ref().take().unwrap().as_raw_fd()
+ }
+}
+
+impl IntoRawFd for crate::Handle {
+ fn into_raw_fd(mut self) -> RawFd {
+ // unwrap() will not panic. Since we were able to open the
+ // file successfully, then `file` is guaranteed to be Some()
+ self.0.file.take().unwrap().into_raw_fd()
+ }
+}
+
+impl Hash for Handle {
+ fn hash<H: Hasher>(&self, state: &mut H) {
+ self.dev.hash(state);
+ self.ino.hash(state);
+ }
+}
+
+impl Handle {
+ pub fn from_path<P: AsRef<Path>>(p: P) -> io::Result<Handle> {
+ Handle::from_file(OpenOptions::new().read(true).open(p)?)
+ }
+
+ pub fn from_file(file: File) -> io::Result<Handle> {
+ let md = file.metadata()?;
+ Ok(Handle {
+ file: Some(file),
+ is_std: false,
+ dev: md.dev(),
+ ino: md.ino(),
+ })
+ }
+
+ pub fn from_std(file: File) -> io::Result<Handle> {
+ Handle::from_file(file).map(|mut h| {
+ h.is_std = true;
+ h
+ })
+ }
+
+ pub fn stdin() -> io::Result<Handle> {
+ Handle::from_std(unsafe { File::from_raw_fd(0) })
+ }
+
+ pub fn stdout() -> io::Result<Handle> {
+ Handle::from_std(unsafe { File::from_raw_fd(1) })
+ }
+
+ pub fn stderr() -> io::Result<Handle> {
+ Handle::from_std(unsafe { File::from_raw_fd(2) })
+ }
+
+ pub fn as_file(&self) -> &File {
+ // unwrap() will not panic. Since we were able to open the
+ // file successfully, then `file` is guaranteed to be Some()
+ self.file.as_ref().take().unwrap()
+ }
+
+ pub fn as_file_mut(&mut self) -> &mut File {
+ // unwrap() will not panic. Since we were able to open the
+ // file successfully, then `file` is guaranteed to be Some()
+ self.file.as_mut().take().unwrap()
+ }
+
+ pub fn dev(&self) -> u64 {
+ self.dev
+ }
+
+ pub fn ino(&self) -> u64 {
+ self.ino
+ }
+}