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