1 // SPDX-License-Identifier: GPL-2.0
2
3 //! Rust printing macros sample.
4
5 use kernel::pr_cont;
6 use kernel::prelude::*;
7
8 module! {
9 type: RustPrint,
10 name: "rust_print",
11 author: "Rust for Linux Contributors",
12 description: "Rust printing macros sample",
13 license: "GPL",
14 }
15
16 struct RustPrint;
17
18 fn arc_print() -> Result {
19 use kernel::sync::*;
20
21 let a = Arc::new(1, GFP_KERNEL)?;
22 let b = UniqueArc::new("hello, world", GFP_KERNEL)?;
23
24 // Prints the value of data in `a`.
25 pr_info!("{}", a);
26
27 // Uses ":?" to print debug fmt of `b`.
28 pr_info!("{:?}", b);
29
30 let a: Arc<&str> = b.into();
31 let c = a.clone();
32
33 // Uses `dbg` to print, will move `c` (for temporary debugging purposes).
34 dbg!(c);
35
36 // Pretty-prints the debug formatting with lower-case hexadecimal integers.
37 pr_info!("{:#x?}", a);
38
39 Ok(())
40 }
41
42 impl kernel::Module for RustPrint {
43 fn init(_module: &'static ThisModule) -> Result<Self> {
44 pr_info!("Rust printing macros sample (init)\n");
45
46 pr_emerg!("Emergency message (level 0) without args\n");
47 pr_alert!("Alert message (level 1) without args\n");
48 pr_crit!("Critical message (level 2) without args\n");
49 pr_err!("Error message (level 3) without args\n");
50 pr_warn!("Warning message (level 4) without args\n");
51 pr_notice!("Notice message (level 5) without args\n");
52 pr_info!("Info message (level 6) without args\n");
53
54 pr_info!("A line that");
55 pr_cont!(" is continued");
56 pr_cont!(" without args\n");
57
58 pr_emerg!("{} message (level {}) with args\n", "Emergency", 0);
59 pr_alert!("{} message (level {}) with args\n", "Alert", 1);
60 pr_crit!("{} message (level {}) with args\n", "Critical", 2);
61 pr_err!("{} message (level {}) with args\n", "Error", 3);
62 pr_warn!("{} message (level {}) with args\n", "Warning", 4);
63 pr_notice!("{} message (level {}) with args\n", "Notice", 5);
64 pr_info!("{} message (level {}) with args\n", "Info", 6);
65
66 pr_info!("A {} that", "line");
67 pr_cont!(" is {}", "continued");
68 pr_cont!(" with {}\n", "args");
69
70 arc_print()?;
71
72 Ok(RustPrint)
73 }
74 }
75
76 impl Drop for RustPrint {
77 fn drop(&mut self) {
78 pr_info!("Rust printing macros sample (exit)\n");
79 }
80 }
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