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rust_print.rs
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// SPDX-License-Identifier: GPL-2.0 //! Rust printing macros sample. use kernel::pr_cont; use kernel::prelude::*; module! { type: RustPrint, name: "rust_print", author: "Rust for Linux Contributors", description: "Rust printing macros sample", license: "GPL", } struct RustPrint; #[allow(clippy::disallowed_macros)] fn arc_print() -> Result { use kernel::sync::*; let a = Arc::new(1, GFP_KERNEL)?; let b = UniqueArc::new("hello, world", GFP_KERNEL)?; // Prints the value of data in `a`. pr_info!("{}", a); // Uses ":?" to print debug fmt of `b`. pr_info!("{:?}", b); let a: Arc<&str> = b.into(); let c = a.clone(); // Uses `dbg` to print, will move `c` (for temporary debugging purposes). dbg!(c); // Pretty-prints the debug formatting with lower-case hexadecimal integers. pr_info!("{:#x?}", a); Ok(()) } impl kernel::Module for RustPrint { fn init(_module: &'static ThisModule) -> Result<Self> { pr_info!("Rust printing macros sample (init)\n"); pr_emerg!("Emergency message (level 0) without args\n"); pr_alert!("Alert message (level 1) without args\n"); pr_crit!("Critical message (level 2) without args\n"); pr_err!("Error message (level 3) without args\n"); pr_warn!("Warning message (level 4) without args\n"); pr_notice!("Notice message (level 5) without args\n"); pr_info!("Info message (level 6) without args\n"); pr_info!("A line that"); pr_cont!(" is continued"); pr_cont!(" without args\n"); pr_emerg!("{} message (level {}) with args\n", "Emergency", 0); pr_alert!("{} message (level {}) with args\n", "Alert", 1); pr_crit!("{} message (level {}) with args\n", "Critical", 2); pr_err!("{} message (level {}) with args\n", "Error", 3); pr_warn!("{} message (level {}) with args\n", "Warning", 4); pr_notice!("{} message (level {}) with args\n", "Notice", 5); pr_info!("{} message (level {}) with args\n", "Info", 6); pr_info!("A {} that", "line"); pr_cont!(" is {}", "continued"); pr_cont!(" with {}\n", "args"); arc_print()?; Ok(RustPrint) } } impl Drop for RustPrint { fn drop(&mut self) { pr_info!("Rust printing macros sample (exit)\n"); } }
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