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(c) 2024 h7x4 + +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. \ No newline at end of file diff --git a/README.md b/README.md new file mode 100644 index 0000000..58256a6 --- /dev/null +++ b/README.md @@ -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. \ No newline at end of file diff --git a/examples/make_realtime/main.rs b/examples/make_realtime/main.rs new file mode 100644 index 0000000..94f9536 --- /dev/null +++ b/examples/make_realtime/main.rs @@ -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), + } +} diff --git a/flake.lock b/flake.lock new file mode 100644 index 0000000..7c9f770 --- /dev/null +++ b/flake.lock @@ -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 +} diff --git a/flake.nix b/flake.nix new file mode 100644 index 0000000..b93a330 --- /dev/null +++ b/flake.nix @@ -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"; + }; + }); + }; +} diff --git a/src/lib.rs b/src/lib.rs new file mode 100644 index 0000000..99c4a74 --- /dev/null +++ b/src/lib.rs @@ -0,0 +1,87 @@ +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) -> Result { + 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) -> Result { + 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, +) -> Result { + 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), + }) +} diff --git a/src/low_level_zbus_api.rs b/src/low_level_zbus_api.rs new file mode 100644 index 0000000..47cfa74 --- /dev/null +++ b/src/low_level_zbus_api.rs @@ -0,0 +1,36 @@ +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; + + #[zbus(property)] + fn max_realtime_priority(&self) -> Result; + + #[zbus(property)] + fn min_nice_level(&self) -> Result; +}