Merge pull request #152 from fuad1502/dmesg

Implement program `dmesg` with support for `--kmsg-file` and `--json` option.

Cargo.lock

@@ -880,6 +880,7 @@ dependencies = [
  "tempfile",
  "textwrap",
  "uu_ctrlaltdel",
+ "uu_dmesg",
  "uu_last",
  "uu_lscpu",
  "uu_lsmem",
@@ -898,6 +899,17 @@ dependencies = [
  "uucore",
 ]
 
+[[package]]
+name = "uu_dmesg"
+version = "0.0.1"
+dependencies = [
+ "clap",
+ "regex",
+ "serde",
+ "serde_json",
+ "uucore",
+]
+
 [[package]]
 name = "uu_last"
 version = "0.0.1"

Cargo.toml

@@ -32,7 +32,8 @@ feat_common_core = [
   "ctrlaltdel",
   "rev",
   "setsid",
-  "last"
+  "last",
+  "dmesg"
 ]
 
 [workspace.dependencies]
@@ -72,6 +73,7 @@ ctrlaltdel = { optional = true, version = "0.0.1", package = "uu_ctrlaltdel", pa
 rev = { optional = true, version = "0.0.1", package = "uu_rev", path = "src/uu/rev" }
 setsid = { optional = true, version = "0.0.1", package = "uu_setsid", path ="src/uu/setsid" }
 last = { optional = true, version = "0.0.1", package = "uu_last", path = "src/uu/last" }
+dmesg = { optional = true, version = "0.0.1", package = "uu_dmesg", path = "src/uu/dmesg" }
 
 [dev-dependencies]
 pretty_assertions = "1"

src/uu/dmesg/Cargo.toml

@@ -0,0 +1,18 @@
+[package]
+name = "uu_dmesg"
+version = "0.0.1"
+edition = "2021"
+
+[lib]
+path = "src/dmesg.rs"
+
+[[bin]]
+name = "dmesg"
+path = "src/main.rs"
+
+[dependencies]
+clap = { workspace = true }
+uucore = { workspace = true }
+regex = { workspace = true }
+serde_json = { workspace = true }
+serde = { workspace = true }

src/uu/dmesg/dmesg.md

@@ -0,0 +1,7 @@
+# dmesg
+
+```
+dmesg [options]
+```
+
+Display or control the kernel ring buffer.

src/uu/dmesg/src/dmesg.rs

@@ -0,0 +1,153 @@
+// This file is part of the uutils util-linux package.
+//
+// For the full copyright and license information, please view the LICENSE
+// file that was distributed with this source code.
+
+use clap::{crate_version, Arg, ArgAction, Command};
+use regex::Regex;
+use std::fs;
+use uucore::{
+    error::{FromIo, UResult, USimpleError},
+    format_usage, help_about, help_usage,
+};
+
+mod json;
+
+const ABOUT: &str = help_about!("dmesg.md");
+const USAGE: &str = help_usage!("dmesg.md");
+
+#[uucore::main]
+pub fn uumain(args: impl uucore::Args) -> UResult<()> {
+    let mut dmesg = Dmesg::new();
+    let matches: clap::ArgMatches = uu_app().try_get_matches_from(args)?;
+    if let Some(kmsg_file) = matches.get_one::<String>(options::KMSG_FILE) {
+        dmesg.kmsg_file = kmsg_file;
+    }
+    if matches.get_flag(options::JSON) {
+        dmesg.output_format = OutputFormat::Json;
+    }
+    dmesg.parse()?.print();
+    Ok(())
+}
+
+pub fn uu_app() -> Command {
+    Command::new(uucore::util_name())
+        .override_usage(format_usage(USAGE))
+        .about(ABOUT)
+        .version(crate_version!())
+        .arg(
+            Arg::new(options::KMSG_FILE)
+                .short('K')
+                .long("kmsg-file")
+                .help("use the file in kmsg format")
+                .action(ArgAction::Set),
+        )
+        .arg(
+            Arg::new(options::JSON)
+                .short('J')
+                .long("json")
+                .help("use JSON output format")
+                .action(ArgAction::SetTrue),
+        )
+}
+
+mod options {
+    pub const KMSG_FILE: &str = "kmsg-file";
+    pub const JSON: &str = "json";
+}
+
+struct Dmesg<'a> {
+    kmsg_file: &'a str,
+    output_format: OutputFormat,
+    records: Option<Vec<Record>>,
+}
+
+impl Dmesg<'_> {
+    fn new() -> Self {
+        Dmesg {
+            kmsg_file: "/dev/kmsg",
+            output_format: OutputFormat::Normal,
+            records: None,
+        }
+    }
+
+    fn parse(mut self) -> UResult<Self> {
+        let mut records = vec![];
+        let re = Self::record_regex();
+        let lines = self.read_lines_from_kmsg_file()?;
+        for line in lines {
+            for (_, [pri_fac, seq, time, msg]) in re.captures_iter(&line).map(|c| c.extract()) {
+                records.push(Record::from_str_fields(
+                    pri_fac,
+                    seq,
+                    time,
+                    msg.to_string(),
+                )?);
+            }
+        }
+        self.records = Some(records);
+        Ok(self)
+    }
+
+    fn record_regex() -> Regex {
+        let valid_number_pattern = "0|[1-9][0-9]*";
+        let additional_fields_pattern = ",^[,;]*";
+        let record_pattern = format!(
+            "(?m)^({0}),({0}),({0}),.(?:{1})*;(.*)$",
+            valid_number_pattern, additional_fields_pattern
+        );
+        Regex::new(&record_pattern).expect("invalid regex.")
+    }
+
+    fn read_lines_from_kmsg_file(&self) -> UResult<Vec<String>> {
+        let kmsg_bytes = fs::read(self.kmsg_file)
+            .map_err_context(|| format!("cannot open {}", self.kmsg_file))?;
+        let lines = kmsg_bytes
+            .split(|&byte| byte == 0)
+            .map(|line| String::from_utf8_lossy(line).to_string())
+            .collect();
+        Ok(lines)
+    }
+
+    fn print(&self) {
+        match self.output_format {
+            OutputFormat::Json => self.print_json(),
+            OutputFormat::Normal => unimplemented!(),
+        }
+    }
+
+    fn print_json(&self) {
+        if let Some(records) = &self.records {
+            println!("{}", json::serialize_records(records));
+        }
+    }
+}
+
+enum OutputFormat {
+    Normal,
+    Json,
+}
+
+struct Record {
+    priority_facility: u32,
+    _sequence: u64,
+    timestamp_us: u64,
+    message: String,
+}
+
+impl Record {
+    fn from_str_fields(pri_fac: &str, seq: &str, time: &str, msg: String) -> UResult<Record> {
+        let pri_fac = str::parse(pri_fac);
+        let seq = str::parse(seq);
+        let time = str::parse(time);
+        match (pri_fac, seq, time) {
+            (Ok(pri_fac), Ok(seq), Ok(time)) => Ok(Record {
+                priority_facility: pri_fac,
+                _sequence: seq,
+                timestamp_us: time,
+                message: msg,
+            }),
+            _ => Err(USimpleError::new(1, "Failed to parse record field(s)")),
+        }
+    }
+}

src/uu/dmesg/src/json.rs

@@ -0,0 +1,142 @@
+// This file is part of the uutils util-linux package.
+//
+// For the full copyright and license information, please view the LICENSE
+// file that was distributed with this source code.
+
+use serde::Serialize;
+use std::io;
+
+pub fn serialize_records(records: &Vec<crate::Record>) -> String {
+    let json = Dmesg::from(records);
+    let formatter = DmesgFormatter::new();
+    let mut buf = vec![];
+    let mut serializer = serde_json::Serializer::with_formatter(&mut buf, formatter);
+    json.serialize(&mut serializer).unwrap();
+    String::from_utf8_lossy(&buf).to_string()
+}
+
+#[derive(serde::Serialize)]
+struct Dmesg<'a> {
+    dmesg: Vec<Record<'a>>,
+}
+
+#[derive(serde::Serialize)]
+struct Record<'a> {
+    pri: u32,
+    time: u64,
+    msg: &'a str,
+}
+
+impl<'a> From<&'a Vec<crate::Record>> for Dmesg<'a> {
+    fn from(value: &'a Vec<crate::Record>) -> Self {
+        let mut dmesg_json = Dmesg { dmesg: vec![] };
+        for record in value {
+            let record_json = Record {
+                pri: record.priority_facility,
+                time: record.timestamp_us,
+                msg: &record.message,
+            };
+            dmesg_json.dmesg.push(record_json);
+        }
+        dmesg_json
+    }
+}
+
+struct DmesgFormatter {
+    nesting_depth: i32,
+}
+
+impl DmesgFormatter {
+    const SINGLE_INDENTATION: &[u8] = b"   ";
+
+    fn new() -> Self {
+        DmesgFormatter { nesting_depth: 0 }
+    }
+
+    fn write_indentation<W>(&mut self, writer: &mut W) -> io::Result<()>
+    where
+        W: ?Sized + io::Write,
+    {
+        for _ in 0..self.nesting_depth {
+            writer.write_all(Self::SINGLE_INDENTATION)?;
+        }
+        Ok(())
+    }
+}
+
+impl serde_json::ser::Formatter for DmesgFormatter {
+    fn begin_object<W>(&mut self, writer: &mut W) -> io::Result<()>
+    where
+        W: ?Sized + io::Write,
+    {
+        self.nesting_depth += 1;
+        writer.write_all(b"{\n")
+    }
+
+    fn end_object<W>(&mut self, writer: &mut W) -> io::Result<()>
+    where
+        W: ?Sized + io::Write,
+    {
+        writer.write_all(b"\n")?;
+        self.nesting_depth -= 1;
+        self.write_indentation(writer)?;
+        writer.write_all(b"}")
+    }
+
+    fn begin_array<W>(&mut self, writer: &mut W) -> io::Result<()>
+    where
+        W: ?Sized + io::Write,
+    {
+        self.nesting_depth += 1;
+        writer.write_all(b"[\n")
+    }
+
+    fn end_array<W>(&mut self, writer: &mut W) -> io::Result<()>
+    where
+        W: ?Sized + io::Write,
+    {
+        writer.write_all(b"\n")?;
+        self.nesting_depth -= 1;
+        self.write_indentation(writer)?;
+        writer.write_all(b"]")
+    }
+
+    fn begin_object_key<W>(&mut self, writer: &mut W, first: bool) -> io::Result<()>
+    where
+        W: ?Sized + io::Write,
+    {
+        if !first {
+            writer.write_all(b",\n")?;
+        }
+        self.write_indentation(writer)
+    }
+
+    fn begin_object_value<W>(&mut self, writer: &mut W) -> io::Result<()>
+    where
+        W: ?Sized + io::Write,
+    {
+        writer.write_all(b": ")
+    }
+
+    fn begin_array_value<W>(&mut self, writer: &mut W, first: bool) -> io::Result<()>
+    where
+        W: ?Sized + io::Write,
+    {
+        if first {
+            self.write_indentation(writer)
+        } else {
+            writer.write_all(b",")
+        }
+    }
+
+    fn write_u64<W>(&mut self, writer: &mut W, value: u64) -> io::Result<()>
+    where
+        W: ?Sized + io::Write,
+    {
+        // The only u64 field in Dmesg is time, which requires a specific format
+        let seconds = value / 1000000;
+        let sub_seconds = value % 1000000;
+        let repr = format!("{:>5}.{:0>6}", seconds, sub_seconds);
+        writer.write_all(repr.as_bytes())
+    }
+}

src/uu/dmesg/src/main.rs

@@ -0,0 +1 @@
+uucore::bin!(uu_dmesg);

tests/by-util/test_dmesg.rs

@@ -0,0 +1,32 @@
+// This file is part of the uutils util-linux package.
+//
+// For the full copyright and license information, please view the LICENSE
+// file that was distributed with this source code.
+use crate::common::util::TestScenario;
+
+#[test]
+fn test_invalid_arg() {
+    new_ucmd!().arg("--definitely-invalid").fails().code_is(1);
+}
+
+#[test]
+fn test_kmsg_nonexistent_file() {
+    new_ucmd!()
+        .arg("--kmsg-file")
+        .arg("definitely-nonexistent-file")
+        .fails()
+        .code_is(1)
+        .no_stdout()
+        .stderr_is("dmesg: cannot open definitely-nonexistent-file: No such file or directory\n");
+}
+
+#[test]
+fn test_kmsg_json() {
+    new_ucmd!()
+        .arg("--kmsg-file")
+        .arg("kmsg.input")
+        .arg("--json")
+        .run()
+        .no_stderr()
+        .stdout_is_templated_fixture("test_kmsg_json.expected", &[("\r\n", "\n")]);
+}

tests/fixtures/dmesg/test_kmsg_json.expected

@@ -0,0 +1,645 @@
+{
+   "dmesg": [
+      {
+         "pri": 32,
+         "time":     0.000000,
+         "msg": "LOG_EMERG LOG_AUTH"
+      },{
+         "pri": 80,
+         "time":  1000.000000,
+         "msg": "LOG_EMERG LOG_AUTHPRIV"
+      },{
+         "pri": 72,
+         "time":  2000.000000,
+         "msg": "LOG_EMERG LOG_CRON"
+      },{
+         "pri": 24,
+         "time":  3000.000000,
+         "msg": "LOG_EMERG LOG_DAEMON"
+      },{
+         "pri": 88,
+         "time":  4000.000000,
+         "msg": "LOG_EMERG LOG_FTP"
+      },{
+         "pri": 0,
+         "time":  5000.000000,
+         "msg": "LOG_EMERG LOG_KERN"
+      },{
+         "pri": 128,
+         "time":  6000.000000,
+         "msg": "LOG_EMERG LOG_LOCAL0"
+      },{
+         "pri": 136,
+         "time":  7000.000000,
+         "msg": "LOG_EMERG LOG_LOCAL1"
+      },{
+         "pri": 144,
+         "time":  8000.000000,
+         "msg": "LOG_EMERG LOG_LOCAL2"
+      },{
+         "pri": 152,
+         "time":  9000.000000,
+         "msg": "LOG_EMERG LOG_LOCAL3"
+      },{
+         "pri": 160,
+         "time": 10000.000000,
+         "msg": "LOG_EMERG LOG_LOCAL4"
+      },{
+         "pri": 168,
+         "time": 11000.000000,
+         "msg": "LOG_EMERG LOG_LOCAL5"
+      },{
+         "pri": 176,
+         "time": 12000.000000,
+         "msg": "LOG_EMERG LOG_LOCAL6"
+      },{
+         "pri": 184,
+         "time": 13000.000000,
+         "msg": "LOG_EMERG LOG_LOCAL7"
+      },{
+         "pri": 48,
+         "time": 14000.000000,
+         "msg": "LOG_EMERG LOG_LPR"
+      },{
+         "pri": 16,
+         "time": 15000.000000,
+         "msg": "LOG_EMERG LOG_MAIL"
+      },{
+         "pri": 56,
+         "time": 16000.000000,
+         "msg": "LOG_EMERG LOG_NEWS"
+      },{
+         "pri": 40,
+         "time": 17000.000000,
+         "msg": "LOG_EMERG LOG_SYSLOG"
+      },{
+         "pri": 8,
+         "time": 18000.000000,
+         "msg": "LOG_EMERG LOG_USER"
+      },{
+         "pri": 64,
+         "time": 19000.000000,
+         "msg": "LOG_EMERG LOG_UUCP"
+      },{
+         "pri": 33,
+         "time": 20000.000000,
+         "msg": "LOG_ALERT LOG_AUTH"
+      },{
+         "pri": 81,
+         "time": 21000.000000,
+         "msg": "LOG_ALERT LOG_AUTHPRIV"
+      },{
+         "pri": 73,
+         "time": 22000.000000,
+         "msg": "LOG_ALERT LOG_CRON"
+      },{
+         "pri": 25,
+         "time": 23000.000000,
+         "msg": "LOG_ALERT LOG_DAEMON"
+      },{
+         "pri": 89,
+         "time": 24000.000000,
+         "msg": "LOG_ALERT LOG_FTP"
+      },{
+         "pri": 1,
+         "time": 25000.000000,
+         "msg": "LOG_ALERT LOG_KERN"
+      },{
+         "pri": 129,
+         "time": 26000.000000,
+         "msg": "LOG_ALERT LOG_LOCAL0"
+      },{
+         "pri": 137,
+         "time": 27000.000000,
+         "msg": "LOG_ALERT LOG_LOCAL1"
+      },{
+         "pri": 145,
+         "time": 28000.000000,
+         "msg": "LOG_ALERT LOG_LOCAL2"
+      },{
+         "pri": 153,
+         "time": 29000.000000,
+         "msg": "LOG_ALERT LOG_LOCAL3"
+      },{
+         "pri": 161,
+         "time": 30000.000000,
+         "msg": "LOG_ALERT LOG_LOCAL4"
+      },{
+         "pri": 169,
+         "time": 31000.000000,
+         "msg": "LOG_ALERT LOG_LOCAL5"
+      },{
+         "pri": 177,
+         "time": 32000.000000,
+         "msg": "LOG_ALERT LOG_LOCAL6"
+      },{
+         "pri": 185,
+         "time": 33000.000000,
+         "msg": "LOG_ALERT LOG_LOCAL7"
+      },{
+         "pri": 49,
+         "time": 34000.000000,
+         "msg": "LOG_ALERT LOG_LPR"
+      },{
+         "pri": 17,
+         "time": 35000.000000,
+         "msg": "LOG_ALERT LOG_MAIL"
+      },{
+         "pri": 57,
+         "time": 36000.000000,
+         "msg": "LOG_ALERT LOG_NEWS"
+      },{
+         "pri": 41,
+         "time": 37000.000000,
+         "msg": "LOG_ALERT LOG_SYSLOG"
+      },{
+         "pri": 9,
+         "time": 38000.000000,
+         "msg": "LOG_ALERT LOG_USER"
+      },{
+         "pri": 65,
+         "time": 39000.000000,
+         "msg": "LOG_ALERT LOG_UUCP"
+      },{
+         "pri": 34,
+         "time": 40000.000000,
+         "msg": "LOG_CRIT LOG_AUTH"
+      },{
+         "pri": 82,
+         "time": 41000.000000,
+         "msg": "LOG_CRIT LOG_AUTHPRIV"
+      },{
+         "pri": 74,
+         "time": 42000.000000,
+         "msg": "LOG_CRIT LOG_CRON"
+      },{
+         "pri": 26,
+         "time": 43000.000000,
+         "msg": "LOG_CRIT LOG_DAEMON"
+      },{
+         "pri": 90,
+         "time": 44000.000000,
+         "msg": "LOG_CRIT LOG_FTP"
+      },{
+         "pri": 2,
+         "time": 45000.000000,
+         "msg": "LOG_CRIT LOG_KERN"
+      },{
+         "pri": 130,
+         "time": 46000.000000,
+         "msg": "LOG_CRIT LOG_LOCAL0"
+      },{
+         "pri": 138,
+         "time": 47000.000000,
+         "msg": "LOG_CRIT LOG_LOCAL1"
+      },{
+         "pri": 146,
+         "time": 48000.000000,
+         "msg": "LOG_CRIT LOG_LOCAL2"
+      },{
+         "pri": 154,
+         "time": 49000.000000,
+         "msg": "LOG_CRIT LOG_LOCAL3"
+      },{
+         "pri": 162,
+         "time": 50000.000000,
+         "msg": "LOG_CRIT LOG_LOCAL4"
+      },{
+         "pri": 170,
+         "time": 51000.000000,
+         "msg": "LOG_CRIT LOG_LOCAL5"
+      },{
+         "pri": 178,
+         "time": 52000.000000,
+         "msg": "LOG_CRIT LOG_LOCAL6"
+      },{
+         "pri": 186,
+         "time": 53000.000000,
+         "msg": "LOG_CRIT LOG_LOCAL7"
+      },{
+         "pri": 50,
+         "time": 54000.000000,
+         "msg": "LOG_CRIT LOG_LPR"
+      },{
+         "pri": 18,
+         "time": 55000.000000,
+         "msg": "LOG_CRIT LOG_MAIL"
+      },{
+         "pri": 58,
+         "time": 56000.000000,
+         "msg": "LOG_CRIT LOG_NEWS"
+      },{
+         "pri": 42,
+         "time": 57000.000000,
+         "msg": "LOG_CRIT LOG_SYSLOG"
+      },{
+         "pri": 10,
+         "time": 58000.000000,
+         "msg": "LOG_CRIT LOG_USER"
+      },{
+         "pri": 66,
+         "time": 59000.000000,
+         "msg": "LOG_CRIT LOG_UUCP"
+      },{
+         "pri": 35,
+         "time": 60000.000000,
+         "msg": "LOG_ERR LOG_AUTH"
+      },{
+         "pri": 83,
+         "time": 61000.000000,
+         "msg": "LOG_ERR LOG_AUTHPRIV"
+      },{
+         "pri": 75,
+         "time": 62000.000000,
+         "msg": "LOG_ERR LOG_CRON"
+      },{
+         "pri": 27,
+         "time": 63000.000000,
+         "msg": "LOG_ERR LOG_DAEMON"
+      },{
+         "pri": 91,
+         "time": 64000.000000,
+         "msg": "LOG_ERR LOG_FTP"
+      },{
+         "pri": 3,
+         "time": 65000.000000,
+         "msg": "LOG_ERR LOG_KERN"
+      },{
+         "pri": 131,
+         "time": 66000.000000,
+         "msg": "LOG_ERR LOG_LOCAL0"
+      },{
+         "pri": 139,
+         "time": 67000.000000,
+         "msg": "LOG_ERR LOG_LOCAL1"
+      },{
+         "pri": 147,
+         "time": 68000.000000,
+         "msg": "LOG_ERR LOG_LOCAL2"
+      },{
+         "pri": 155,
+         "time": 69000.000000,
+         "msg": "LOG_ERR LOG_LOCAL3"
+      },{
+         "pri": 163,
+         "time": 70000.000000,
+         "msg": "LOG_ERR LOG_LOCAL4"
+      },{
+         "pri": 171,
+         "time": 71000.000000,
+         "msg": "LOG_ERR LOG_LOCAL5"
+      },{
+         "pri": 179,
+         "time": 72000.000000,
+         "msg": "LOG_ERR LOG_LOCAL6"
+      },{
+         "pri": 187,
+         "time": 73000.000000,
+         "msg": "LOG_ERR LOG_LOCAL7"
+      },{
+         "pri": 51,
+         "time": 74000.000000,
+         "msg": "LOG_ERR LOG_LPR"
+      },{
+         "pri": 19,
+         "time": 75000.000000,
+         "msg": "LOG_ERR LOG_MAIL"
+      },{
+         "pri": 59,
+         "time": 76000.000000,
+         "msg": "LOG_ERR LOG_NEWS"
+      },{
+         "pri": 43,
+         "time": 77000.000000,
+         "msg": "LOG_ERR LOG_SYSLOG"
+      },{
+         "pri": 11,
+         "time": 78000.000000,
+         "msg": "LOG_ERR LOG_USER"
+      },{
+         "pri": 67,
+         "time": 79000.000000,
+         "msg": "LOG_ERR LOG_UUCP"
+      },{
+         "pri": 36,
+         "time": 80000.000000,
+         "msg": "LOG_WARNING LOG_AUTH"
+      },{
+         "pri": 84,
+         "time": 81000.000000,
+         "msg": "LOG_WARNING LOG_AUTHPRIV"
+      },{
+         "pri": 76,
+         "time": 82000.000000,
+         "msg": "LOG_WARNING LOG_CRON"
+      },{
+         "pri": 28,
+         "time": 83000.000000,
+         "msg": "LOG_WARNING LOG_DAEMON"
+      },{
+         "pri": 92,
+         "time": 84000.000000,
+         "msg": "LOG_WARNING LOG_FTP"
+      },{
+         "pri": 4,
+         "time": 85000.000000,
+         "msg": "LOG_WARNING LOG_KERN"
+      },{
+         "pri": 132,
+         "time": 86000.000000,
+         "msg": "LOG_WARNING LOG_LOCAL0"
+      },{
+         "pri": 140,
+         "time": 87000.000000,
+         "msg": "LOG_WARNING LOG_LOCAL1"
+      },{
+         "pri": 148,
+         "time": 88000.000000,
+         "msg": "LOG_WARNING LOG_LOCAL2"
+      },{
+         "pri": 156,
+         "time": 89000.000000,
+         "msg": "LOG_WARNING LOG_LOCAL3"
+      },{
+         "pri": 164,
+         "time": 90000.000000,
+         "msg": "LOG_WARNING LOG_LOCAL4"
+      },{
+         "pri": 172,
+         "time": 91000.000000,
+         "msg": "LOG_WARNING LOG_LOCAL5"
+      },{
+         "pri": 180,
+         "time": 92000.000000,
+         "msg": "LOG_WARNING LOG_LOCAL6"
+      },{
+         "pri": 188,
+         "time": 93000.000000,
+         "msg": "LOG_WARNING LOG_LOCAL7"
+      },{
+         "pri": 52,
+         "time": 94000.000000,
+         "msg": "LOG_WARNING LOG_LPR"
+      },{
+         "pri": 20,
+         "time": 95000.000000,
+         "msg": "LOG_WARNING LOG_MAIL"
+      },{
+         "pri": 60,
+         "time": 96000.000000,
+         "msg": "LOG_WARNING LOG_NEWS"
+      },{
+         "pri": 44,
+         "time": 97000.000000,
+         "msg": "LOG_WARNING LOG_SYSLOG"
+      },{
+         "pri": 12,
+         "time": 98000.000000,
+         "msg": "LOG_WARNING LOG_USER"
+      },{
+         "pri": 68,
+         "time": 99000.000000,
+         "msg": "LOG_WARNING LOG_UUCP"
+      },{
+         "pri": 37,
+         "time": 100000.000000,
+         "msg": "LOG_NOTICE LOG_AUTH"
+      },{
+         "pri": 85,
+         "time": 101000.000000,
+         "msg": "LOG_NOTICE LOG_AUTHPRIV"
+      },{
+         "pri": 77,
+         "time": 102000.000000,
+         "msg": "LOG_NOTICE LOG_CRON"
+      },{
+         "pri": 29,
+         "time": 103000.000000,
+         "msg": "LOG_NOTICE LOG_DAEMON"
+      },{
+         "pri": 93,
+         "time": 104000.000000,
+         "msg": "LOG_NOTICE LOG_FTP"
+      },{
+         "pri": 5,
+         "time": 105000.000000,
+         "msg": "LOG_NOTICE LOG_KERN"
+      },{
+         "pri": 133,
+         "time": 106000.000000,
+         "msg": "LOG_NOTICE LOG_LOCAL0"
+      },{
+         "pri": 141,
+         "time": 107000.000000,
+         "msg": "LOG_NOTICE LOG_LOCAL1"
+      },{
+         "pri": 149,
+         "time": 108000.000000,
+         "msg": "LOG_NOTICE LOG_LOCAL2"
+      },{
+         "pri": 157,
+         "time": 109000.000000,
+         "msg": "LOG_NOTICE LOG_LOCAL3"
+      },{
+         "pri": 165,
+         "time": 110000.000000,
+         "msg": "LOG_NOTICE LOG_LOCAL4"
+      },{
+         "pri": 173,
+         "time": 111000.000000,
+         "msg": "LOG_NOTICE LOG_LOCAL5"
+      },{
+         "pri": 181,
+         "time": 112000.000000,
+         "msg": "LOG_NOTICE LOG_LOCAL6"
+      },{
+         "pri": 189,
+         "time": 113000.000000,
+         "msg": "LOG_NOTICE LOG_LOCAL7"
+      },{
+         "pri": 53,
+         "time": 114000.000000,
+         "msg": "LOG_NOTICE LOG_LPR"
+      },{
+         "pri": 21,
+         "time": 115000.000000,
+         "msg": "LOG_NOTICE LOG_MAIL"
+      },{
+         "pri": 61,
+         "time": 116000.000000,
+         "msg": "LOG_NOTICE LOG_NEWS"
+      },{
+         "pri": 45,
+         "time": 117000.000000,
+         "msg": "LOG_NOTICE LOG_SYSLOG"
+      },{
+         "pri": 13,
+         "time": 118000.000000,
+         "msg": "LOG_NOTICE LOG_USER"
+      },{
+         "pri": 69,
+         "time": 119000.000000,
+         "msg": "LOG_NOTICE LOG_UUCP"
+      },{
+         "pri": 38,
+         "time": 120000.000000,
+         "msg": "LOG_INFO LOG_AUTH"
+      },{
+         "pri": 86,
+         "time": 121000.000000,
+         "msg": "LOG_INFO LOG_AUTHPRIV"
+      },{
+         "pri": 78,
+         "time": 122000.000000,
+         "msg": "LOG_INFO LOG_CRON"
+      },{
+         "pri": 30,
+         "time": 123000.000000,
+         "msg": "LOG_INFO LOG_DAEMON"
+      },{
+         "pri": 94,
+         "time": 124000.000000,
+         "msg": "LOG_INFO LOG_FTP"
+      },{
+         "pri": 6,
+         "time": 125000.000000,
+         "msg": "LOG_INFO LOG_KERN"
+      },{
+         "pri": 134,
+         "time": 126000.000000,
+         "msg": "LOG_INFO LOG_LOCAL0"
+      },{
+         "pri": 142,
+         "time": 127000.000000,
+         "msg": "LOG_INFO LOG_LOCAL1"
+      },{
+         "pri": 150,
+         "time": 128000.000000,
+         "msg": "LOG_INFO LOG_LOCAL2"
+      },{
+         "pri": 158,
+         "time": 129000.000000,
+         "msg": "LOG_INFO LOG_LOCAL3"
+      },{
+         "pri": 166,
+         "time": 130000.000000,
+         "msg": "LOG_INFO LOG_LOCAL4"
+      },{
+         "pri": 174,
+         "time": 131000.000000,
+         "msg": "LOG_INFO LOG_LOCAL5"
+      },{
+         "pri": 182,
+         "time": 132000.000000,
+         "msg": "LOG_INFO LOG_LOCAL6"
+      },{
+         "pri": 190,
+         "time": 133000.000000,
+         "msg": "LOG_INFO LOG_LOCAL7"
+      },{
+         "pri": 54,
+         "time": 134000.000000,
+         "msg": "LOG_INFO LOG_LPR"
+      },{
+         "pri": 22,
+         "time": 135000.000000,
+         "msg": "LOG_INFO LOG_MAIL"
+      },{
+         "pri": 62,
+         "time": 136000.000000,
+         "msg": "LOG_INFO LOG_NEWS"
+      },{
+         "pri": 46,
+         "time": 137000.000000,
+         "msg": "LOG_INFO LOG_SYSLOG"
+      },{
+         "pri": 14,
+         "time": 138000.000000,
+         "msg": "LOG_INFO LOG_USER"
+      },{
+         "pri": 70,
+         "time": 139000.000000,
+         "msg": "LOG_INFO LOG_UUCP"
+      },{
+         "pri": 39,
+         "time": 140000.000000,
+         "msg": "LOG_DEBUG LOG_AUTH"
+      },{
+         "pri": 87,
+         "time": 141000.000000,
+         "msg": "LOG_DEBUG LOG_AUTHPRIV"
+      },{
+         "pri": 79,
+         "time": 142000.000000,
+         "msg": "LOG_DEBUG LOG_CRON"
+      },{
+         "pri": 31,
+         "time": 143000.000000,
+         "msg": "LOG_DEBUG LOG_DAEMON"
+      },{
+         "pri": 95,
+         "time": 144000.000000,
+         "msg": "LOG_DEBUG LOG_FTP"
+      },{
+         "pri": 7,
+         "time": 145000.000000,
+         "msg": "LOG_DEBUG LOG_KERN"
+      },{
+         "pri": 135,
+         "time": 146000.000000,
+         "msg": "LOG_DEBUG LOG_LOCAL0"
+      },{
+         "pri": 143,
+         "time": 147000.000000,
+         "msg": "LOG_DEBUG LOG_LOCAL1"
+      },{
+         "pri": 151,
+         "time": 148000.000000,
+         "msg": "LOG_DEBUG LOG_LOCAL2"
+      },{
+         "pri": 159,
+         "time": 149000.000000,
+         "msg": "LOG_DEBUG LOG_LOCAL3"
+      },{
+         "pri": 167,
+         "time": 150000.000000,
+         "msg": "LOG_DEBUG LOG_LOCAL4"
+      },{
+         "pri": 175,
+         "time": 151000.000000,
+         "msg": "LOG_DEBUG LOG_LOCAL5"
+      },{
+         "pri": 183,
+         "time": 152000.000000,
+         "msg": "LOG_DEBUG LOG_LOCAL6"
+      },{
+         "pri": 191,
+         "time": 153000.000000,
+         "msg": "LOG_DEBUG LOG_LOCAL7"
+      },{
+         "pri": 55,
+         "time": 154000.000000,
+         "msg": "LOG_DEBUG LOG_LPR"
+      },{
+         "pri": 23,
+         "time": 155000.000000,
+         "msg": "LOG_DEBUG LOG_MAIL"
+      },{
+         "pri": 63,
+         "time": 156000.000000,
+         "msg": "LOG_DEBUG LOG_NEWS"
+      },{
+         "pri": 47,
+         "time": 157000.000000,
+         "msg": "LOG_DEBUG LOG_SYSLOG"
+      },{
+         "pri": 15,
+         "time": 158000.000000,
+         "msg": "LOG_DEBUG LOG_USER"
+      },{
+         "pri": 71,
+         "time": 159000.000000,
+         "msg": "LOG_DEBUG LOG_UUCP"
+      }
+   ]
+}

tests/tests.rs

@@ -32,3 +32,7 @@ mod test_setsid;
 #[cfg(feature = "last")]
 #[path = "by-util/test_last.rs"]
 mod test_last;
+
+#[cfg(feature = "dmesg")]
+#[path = "by-util/test_dmesg.rs"]
+mod test_dmesg;