1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
use crate::{util, Error};
use std::{fs::File, io};
macro_rules! parse_single {
($name:expr) => {
|input| {
let (input, name) = util::parse_token(input).ok_or(Error::from("cannot read name"))?;
if name != $name {
return Err(Error::from(format!(
"incorrect name, expected: {}, actual: {}",
$name, name
)));
}
let (input, value) = util::parse_u64(input).ok_or(Error::from("cannot read value"))?;
let input = util::consume_space(input);
if !input.is_empty() {
return Err(Error::from("trailing content"));
}
Ok(value)
}
};
}
#[derive(Debug, Clone, Eq, PartialEq, Ord, PartialOrd, Hash)]
pub struct Stat {
pub cpu_totals: StatCpu,
pub cpus: Vec<StatCpu>,
pub context_switches: u64,
pub boot_time: u64,
pub processes: u64,
pub procs_running: u64,
pub procs_blocked: u64,
}
impl Stat {
const PATH: &'static str = "/proc/stat";
pub fn from_system() -> io::Result<Self> {
Stat::from_reader(File::open(Self::PATH)?)
}
fn from_reader(reader: impl io::Read) -> io::Result<Self> {
let mut reader = util::LineParser::new(reader);
let cpu_totals = reader.parse_line(StatCpu::from_str)?;
let mut cpus = Vec::new();
loop {
if let Ok(cpu_info) = reader.parse_line(StatCpu::from_str) {
cpus.push(cpu_info);
} else {
break;
}
}
reader.parse_line(util::parse_dummy)?;
let context_switches = reader.parse_line(parse_single!("ctxt"))?;
let boot_time = reader.parse_line(parse_single!("btime"))?;
let processes = reader.parse_line(parse_single!("processes"))?;
let procs_running = reader.parse_line(parse_single!("procs_running"))?;
let procs_blocked = reader.parse_line(parse_single!("procs_blocked"))?;
Ok(Stat {
cpu_totals,
cpus,
context_switches,
boot_time,
processes,
procs_running,
procs_blocked,
})
}
}
#[derive(Debug, Copy, Clone, Eq, PartialEq, Ord, PartialOrd, Hash)]
pub struct StatCpu {
pub user: u64,
pub nice: u64,
pub system: u64,
pub idle: u64,
pub iowait: u64,
pub irq: u64,
pub softirq: u64,
pub steal: Option<u64>,
pub guest: Option<u64>,
pub guest_nice: Option<u64>,
}
macro_rules! err_msg {
($inner:expr, $msg:expr) => {
$inner.ok_or_else(|| Error::from($msg))
};
}
impl StatCpu {
fn from_str(input: &str) -> Result<StatCpu, Error> {
let (input, cpunum) = err_msg!(util::parse_token(input), "first token")?;
if !cpunum.starts_with("cpu") {
return Err("starts with cpu<x>".into());
}
let (input, user) = err_msg!(util::parse_u64(input), "user")?;
let (input, nice) = err_msg!(util::parse_u64(input), "nice")?;
let (input, system) = err_msg!(util::parse_u64(input), "system")?;
let (input, idle) = err_msg!(util::parse_u64(input), "idle")?;
let (input, iowait) = err_msg!(util::parse_u64(input), "iowait")?;
let (input, irq) = err_msg!(util::parse_u64(input), "irq")?;
let (input, softirq) = err_msg!(util::parse_u64(input), "softirq")?;
let (input, steal) = match util::parse_u64(input) {
Some((i, steal)) => (i, Some(steal)),
None => (input, None),
};
let (input, guest) = match util::parse_u64(input) {
Some((i, guest)) => (i, Some(guest)),
None => (input, None),
};
let (_, guest_nice) = match util::parse_u64(input) {
Some((i, guest_nice)) => (i, Some(guest_nice)),
None => (input, None),
};
Ok(StatCpu {
user,
nice,
system,
idle,
iowait,
irq,
softirq,
steal,
guest,
guest_nice,
})
}
pub fn total(&self) -> u64 {
self.user
.checked_add(self.nice)
.unwrap()
.checked_add(self.system)
.unwrap()
.checked_add(self.idle)
.unwrap()
.checked_add(self.iowait)
.unwrap()
.checked_add(self.irq)
.unwrap()
.checked_add(self.softirq)
.unwrap()
.checked_add(self.steal.unwrap_or(0))
.unwrap()
.checked_add(self.guest.unwrap_or(0))
.unwrap()
.checked_add(self.guest_nice.unwrap_or(0))
.unwrap()
}
}
#[test]
fn test_stat() {
let raw = "\
cpu 17501 2 6293 8212469 20141 1955 805 0 0 0
cpu0 4713 0 1720 2049410 8036 260 255 0 0 0
cpu1 3866 0 1325 2054893 3673 928 307 0 0 0
cpu2 4966 1 1988 2051243 5596 516 141 0 0 0
cpu3 3955 0 1258 2056922 2835 250 100 0 0 0
intr 1015182 8 8252 0 0 0 0 0 0 1 113449 0 0 198907 0 0 0 18494 0 0 1 0 0 0 29 22 7171 46413 13 0 413 167 528 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
ctxt 2238717
btime 1535128607
processes 2453
procs_running 1
procs_blocked 0
softirq 4257581 64 299604 69 2986 36581 0 3497229 283111 0 137937
";
let _stat = Stat::from_reader(io::Cursor::new(raw)).unwrap();
}