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Oystein Kristoffer Tveit 2024-11-22 21:20:05 +01:00
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9
Cargo.toml Normal file
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@ -0,0 +1,9 @@
[package]
name = "rtkit-client-rs"
version = "0.1.0"
edition = "2021"
[dependencies]
nix = { version = "0.29.0", features = ["process"] }
thiserror = "2.0.3"
zbus = "5.1.1"

21
LICENSE Normal file
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@ -0,0 +1,21 @@
MIT License
Copyright (c) 2024 h7x4 <h7x4@nani.wtf>
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.

9
README.md Normal file
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@ -0,0 +1,9 @@
# rtkit-client-rs
Small implementation of the rtkit dbus interface in rust.
This interface lets you request real-time scheduling for one or more threads.
## Usage
See the examples directory.

21
examples/make_realtime/main.rs Normal file
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@ -0,0 +1,21 @@
use nix::unistd::gettid;
use std::thread;
// use rtkit_client_rs::::RTKitProxyBlocking;
use rtkit_client_rs::{make_current_thread_realtime, Error};
fn main() {
println!("Main tid: {}", gettid());
thread::spawn(important_thread).join().unwrap();
}
fn important_thread() {
println!("Important thread tid: {}", gettid());
let requested_priority = 40;
let actual_priority = make_current_thread_realtime(Some(requested_priority));
match actual_priority {
Ok(actual_priority) => println!("Requested priority: {}, Actual priority: {}", requested_priority, actual_priority),
Err(Error::PermissionDenied) => println!("Permission denied. Do you have polkit rules set up, or otherwise have the necessary permissions?"),
Err(e) => println!("Internal zbus error: {}", e),
}
}

48
flake.lock Normal file
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@ -0,0 +1,48 @@
{
"nodes": {
"nixpkgs": {
"locked": {
"lastModified": 1732014248,
"narHash": "sha256-y/MEyuJ5oBWrWAic/14LaIr/u5E0wRVzyYsouYY3W6w=",
"owner": "NixOS",
"repo": "nixpkgs",
"rev": "23e89b7da85c3640bbc2173fe04f4bd114342367",
"type": "github"
},
"original": {
"owner": "NixOS",
"ref": "nixos-unstable",
"repo": "nixpkgs",
"type": "github"
}
},
"root": {
"inputs": {
"nixpkgs": "nixpkgs",
"rust-overlay": "rust-overlay"
}
},
"rust-overlay": {
"inputs": {
"nixpkgs": [
"nixpkgs"
]
},
"locked": {
"lastModified": 1732242723,
"narHash": "sha256-NWI8csIK0ujFlFuEXKnoc+7hWoCiEtINK9r48LUUMeU=",
"owner": "oxalica",
"repo": "rust-overlay",
"rev": "a229311fcb45b88a95fdfa5cecd8349c809a272a",
"type": "github"
},
"original": {
"owner": "oxalica",
"repo": "rust-overlay",
"type": "github"
}
}
},
"root": "root",
"version": 7
}

43
flake.nix Normal file
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@ -0,0 +1,43 @@
{
inputs = {
nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
rust-overlay.url = "github:oxalica/rust-overlay";
rust-overlay.inputs.nixpkgs.follows = "nixpkgs";
};
outputs = { self, nixpkgs, rust-overlay }:
let
inherit (nixpkgs) lib;
systems = [
"x86_64-linux"
"aarch64-linux"
"armv7l-linux"
];
forAllSystems = f: lib.genAttrs systems (system: let
pkgs = import nixpkgs {
inherit system;
overlays = [
(import rust-overlay)
];
};
rust-bin = rust-overlay.lib.mkRustBin { } pkgs.buildPackages;
toolchain = rust-bin.stable.latest.default.override {
extensions = [ "rust-src" "rust-analyzer" "rust-std" ];
};
in f system pkgs toolchain);
in {
devShells = forAllSystems (system: pkgs: toolchain: {
default = pkgs.mkShell {
nativeBuildInputs = [
toolchain
];
RUST_SRC_PATH = "${toolchain}/lib/rustlib/src/rust/library";
};
});
};
}

87
src/lib.rs Normal file
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mod low_level_zbus_api;
#[derive(thiserror::Error, Debug)]
pub enum Error {
#[error("Permission denied")]
PermissionDenied,
#[error(transparent)]
ZbusError(#[from] zbus::Error),
#[error(transparent)]
ZbusMethodError(#[from] zbus::fdo::Error),
}
/// Helper for [make_thread_realtime], uses the current thread's tid.
pub fn make_current_thread_realtime(priority: Option<u32>) -> Result<u32, Error> {
let thread_id = nix::unistd::gettid().as_raw().try_into().unwrap();
make_thread_realtime(thread_id, priority)
}
/// Elevates the realtime priority of a thread as close as possible to the requested priority.
///
/// If no priority is specified, the maximum priority allowed by the system will be used.
///
/// Returns the actual priority that was set.
pub fn make_thread_realtime(tid: u64, priority: Option<u32>) -> Result<u32, Error> {
debug_assert!(
priority.is_some_and(|p| p <= 99),
"priority must be between 0 and 99"
);
let connection = zbus::blocking::Connection::system()?;
let proxy = low_level_zbus_api::RTKitProxyBlocking::builder(&connection)
.cache_properties(zbus::proxy::CacheProperties::No)
.build()?;
let max_realtime_priority = proxy.max_realtime_priority()?;
debug_assert!(
(0..=99).contains(&max_realtime_priority),
"max_realtime_priority must be between 0 and 99"
);
let priority = priority.unwrap_or(max_realtime_priority as u32);
proxy
.make_thread_realtime(tid, priority)
.map(|_| priority)
.map_err(|e| match e {
zbus::fdo::Error::AccessDenied(_) => Error::PermissionDenied,
e => Error::ZbusMethodError(e),
})
}
/// Elevates the realtime priority of a specified processes thread as close as possible to the requested priority.
///
/// If no priority is specified, the maximum priority allowed by the system will be used.
///
/// Returns the actual priority that was set.
pub fn make_process_thread_realtime(
pid: u64,
tid: u64,
priority: Option<u32>,
) -> Result<u32, Error> {
debug_assert!(
priority.is_some_and(|p| p <= 99),
"priority must be between 0 and 99"
);
let connection = zbus::blocking::Connection::system()?;
let proxy = low_level_zbus_api::RTKitProxyBlocking::builder(&connection)
.cache_properties(zbus::proxy::CacheProperties::No)
.build()?;
let max_realtime_priority = proxy.max_realtime_priority()?;
debug_assert!(
(0..=99).contains(&max_realtime_priority),
"max_realtime_priority must be between 0 and 99"
);
let priority = priority.unwrap_or(max_realtime_priority as u32);
proxy
.make_thread_realtime_with_pid(pid, tid, priority)
.map(|_| priority)
.map_err(|e| match e {
zbus::fdo::Error::AccessDenied(_) => Error::PermissionDenied,
e => Error::ZbusMethodError(e),
})
}

36
src/low_level_zbus_api.rs Normal file
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use zbus::{fdo::Result, proxy};
/// Low level interface to the RealtimeKit1 D-Bus service.
///
/// Note: due to a missing implementation of GetAll in the canonical rtkit service,
/// you will need to disable the cache for properties in order not to trigger an UnknownMethod error.
#[proxy(
interface = "org.freedesktop.RealtimeKit1",
default_service = "org.freedesktop.RealtimeKit1",
default_path = "/org/freedesktop/RealtimeKit1"
)]
pub trait RTKit {
fn make_thread_realtime(&self, thread: u64, priority: u32) -> Result<()>;
fn make_thread_realtime_with_pid(&self, process: u64, thread: u64, priority: u32)
-> Result<()>;
fn make_thread_high_priority(&self, thread: u64, priority: i32) -> Result<()>;
fn make_thread_high_priority_with_pid(
&self,
process: u64,
thread: u64,
// lmao, why are these different?
priority: i32,
) -> Result<()>;
fn reset_known(&self) -> Result<()>;
fn reset_all(&self) -> Result<()>;
fn exit(&self) -> Result<()>;
#[zbus(property)]
fn rt_time_usec_max(&self) -> Result<i64>;
#[zbus(property)]
fn max_realtime_priority(&self) -> Result<i32>;
#[zbus(property)]
fn min_nice_level(&self) -> Result<i32>;
}