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Add "Fd" wrapper for RawFd type.

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This allows more type-safe usage of RawFds (preventing confusion with other c_ints) and provides a lightweight type that is usable in arguments to methods that take parameters of type AsRawFd.

BUG=None
TEST=Built.

Change-Id: Ibdeb03b0e759577385b05acb25ce76d51f2188c6
Reviewed-on: https://chromium-review.googlesource.com/1396495
Commit-Ready: ChromeOS CL Exonerator Bot <chromiumos-cl-exonerator@appspot.gserviceaccount.com>
Tested-by: Miriam Zimmerman <mutexlox@chromium.org>
Reviewed-by: David Tolnay <dtolnay@chromium.org>
Reviewed-by: Dylan Reid <dgreid@chromium.org>
This commit is contained in:
Miriam Zimmerman 2019-01-04 11:32:59 -08:00 committed by chrome-bot
parent 70eb15dbb7
commit 3a794ccb25
2 changed files with 18 additions and 0 deletions
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2
sys_util/src/lib.rs
View file

@ -29,6 +29,7 @@ mod mmap;
mod passwd;
mod poll;
mod priority;
mod raw_fd;
mod seek_hole;
mod shm;
pub mod signal;
@ -53,6 +54,7 @@ pub use passwd::*;
pub use poll::*;
pub use poll_token_derive::*;
pub use priority::*;
pub use raw_fd::*;
pub use shm::*;
pub use signal::*;
pub use signalfd::*;

16
sys_util/src/raw_fd.rs Normal file
View file

@ -0,0 +1,16 @@
// Copyright 2019 The Chromium OS Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// Utility file to provide a slightly safer Fd type that cannot be confused with c_int.
// Also useful for situations that require something that is `AsRawFd` but
// where we don't want to store more than the fd.
use std::os::unix::io::{AsRawFd, RawFd};
pub struct Fd(pub RawFd);
impl AsRawFd for Fd {
fn as_raw_fd(&self) -> RawFd {
self.0
}
}