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
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
|
//! Process data collection for Linux.
use std::collections::hash_map::Entry;
use fxhash::{FxHashMap, FxHashSet};
use procfs::process::{Process, Stat};
use sysinfo::ProcessStatus;
use super::{ProcessHarvest, UserTable};
use crate::components::tui_widget::time_chart::Point;
use crate::utils::error::{self, BottomError};
use crate::Pid;
/// Maximum character length of a /proc/<PID>/stat process name.
/// If it's equal or greater, then we instead refer to the command for the name.
const MAX_STAT_NAME_LEN: usize = 15;
#[derive(Debug, Clone)]
pub struct PrevProcDetails {
pub total_read_bytes: u64,
pub total_write_bytes: u64,
pub cpu_time: u64,
pub process: Process,
}
impl PrevProcDetails {
fn new(pid: Pid) -> error::Result<Self> {
Ok(Self {
total_read_bytes: 0,
total_write_bytes: 0,
cpu_time: 0,
process: Process::new(pid)?,
})
}
}
fn calculate_idle_values(line: String) -> Point {
/// Converts a `Option<&str>` value to an f64. If it fails to parse or is `None`, then it will return `0_f64`.
fn str_to_f64(val: Option<&str>) -> f64 {
val.and_then(|v| v.parse::<f64>().ok()).unwrap_or(0_f64)
}
let mut val = line.split_whitespace();
let user = str_to_f64(val.next());
let nice: f64 = str_to_f64(val.next());
let system: f64 = str_to_f64(val.next());
let idle: f64 = str_to_f64(val.next());
let iowait: f64 = str_to_f64(val.next());
let irq: f64 = str_to_f64(val.next());
let softirq: f64 = str_to_f64(val.next());
let steal: f64 = str_to_f64(val.next());
// Note we do not get guest/guest_nice, as they are calculated as part of user/nice respectively
// See https://github.com/htop-dev/htop/blob/main/linux/LinuxProcessList.c
let idle = idle + iowait;
let non_idle = user + nice + system + irq + softirq + steal;
(idle, non_idle)
}
fn cpu_usage_calculation(prev_idle: &mut f64, prev_non_idle: &mut f64) -> error::Result<Point> {
use std::io::prelude::*;
use std::io::BufReader;
// From SO answer: https://stackoverflow.com/a/23376195
let mut reader = BufReader::new(std::fs::File::open("/proc/stat")?);
let mut first_line = String::new();
reader.read_line(&mut first_line)?;
let (idle, non_idle) = calculate_idle_values(first_line);
let total = idle + non_idle;
let prev_total = *prev_idle + *prev_non_idle;
let total_delta: f64 = total - prev_total;
let idle_delta: f64 = idle - *prev_idle;
*prev_idle = idle;
*prev_non_idle = non_idle;
let result = if total_delta - idle_delta != 0_f64 {
total_delta - idle_delta
} else {
1_f64
};
let cpu_percentage = if total_delta != 0_f64 {
result / total_delta
} else {
0_f64
};
Ok((result, cpu_percentage))
}
/// Returns the usage and a new set of process times. Note: cpu_fraction should be represented WITHOUT the x100 factor!
fn get_linux_cpu_usage(
stat: &Stat, cpu_usage: f64, cpu_fraction: f64, prev_proc_times: u64,
use_current_cpu_total: bool,
) -> (f64, u64) {
// Based heavily on https://stackoverflow.com/a/23376195 and https://stackoverflow.com/a/1424556
let new_proc_times = stat.utime + stat.stime;
let diff = (new_proc_times - prev_proc_times) as f64; // I HATE that it's done like this but there isn't a try_from for u64 -> f64... we can accept a bit of loss in the worst case though
if cpu_usage == 0.0 {
(0.0, new_proc_times)
} else if use_current_cpu_total {
(diff / cpu_usage * 100_f64, new_proc_times)
} else {
(diff / cpu_usage * 100_f64 * cpu_fraction, new_proc_times)
}
}
fn read_proc(
prev_proc: &PrevProcDetails, stat: &Stat, cpu_usage: f64, cpu_fraction: f64,
use_current_cpu_total: bool, time_difference_in_secs: u64, mem_total_kb: u64,
user_table: &mut UserTable,
) -> error::Result<(ProcessHarvest, u64)> {
use std::convert::TryFrom;
let process = &prev_proc.process;
let (command, name) = {
let truncated_name = stat.comm.as_str();
if let Ok(cmdline) = process.cmdline() {
if cmdline.is_empty() {
(format!("[{}]", truncated_name), truncated_name.to_string())
} else {
(
cmdline.join(" "),
if truncated_name.len() >= MAX_STAT_NAME_LEN {
if let Some(first_part) = cmdline.first() {
// We're only interested in the executable part... not the file path.
// That's for command.
first_part
.rsplit_once('/')
.map(|(_prefix, suffix)| suffix)
.unwrap_or(truncated_name)
.to_string()
} else {
truncated_name.to_string()
}
} else {
truncated_name.to_string()
},
)
}
} else {
(truncated_name.to_string(), truncated_name.to_string())
}
};
let process_state_char = stat.state;
let process_state = (
ProcessStatus::from(process_state_char).to_string(),
process_state_char,
);
let (cpu_usage_percent, new_process_times) = get_linux_cpu_usage(
stat,
cpu_usage,
cpu_fraction,
prev_proc.cpu_time,
use_current_cpu_total,
);
let parent_pid = Some(stat.ppid);
let mem_usage_bytes = u64::try_from(stat.rss_bytes()?).unwrap_or(0);
let mem_usage_kb = mem_usage_bytes / 1024;
let mem_usage_percent = mem_usage_kb as f64 / mem_total_kb as f64 * 100.0;
// This can fail if permission is denied!
let (total_read_bytes, total_write_bytes, read_bytes_per_sec, write_bytes_per_sec) =
if let Ok(io) = process.io() {
let total_read_bytes = io.read_bytes;
let total_write_bytes = io.write_bytes;
let read_bytes_per_sec = if time_difference_in_secs == 0 {
0
} else {
total_read_bytes.saturating_sub(prev_proc.total_read_bytes)
/ time_difference_in_secs
};
let write_bytes_per_sec = if time_difference_in_secs == 0 {
0
} else {
total_write_bytes.saturating_sub(prev_proc.total_write_bytes)
/ time_difference_in_secs
};
(
total_read_bytes,
total_write_bytes,
read_bytes_per_sec,
write_bytes_per_sec,
)
} else {
(0, 0, 0, 0)
};
let uid = process.owner;
Ok((
ProcessHarvest {
pid: process.pid,
parent_pid,
cpu_usage_percent,
mem_usage_percent,
mem_usage_bytes,
name,
command,
read_bytes_per_sec,
write_bytes_per_sec,
total_read_bytes,
total_write_bytes,
process_state,
uid: Some(uid),
user: user_table
.get_uid_to_username_mapping(uid)
.map(Into::into)
.unwrap_or_else(|_| "N/A".into()),
},
new_process_times,
))
}
pub fn get_process_data(
prev_idle: &mut f64, prev_non_idle: &mut f64,
pid_mapping: &mut FxHashMap<Pid, PrevProcDetails>, use_current_cpu_total: bool,
time_difference_in_secs: u64, mem_total_kb: u64, user_table: &mut UserTable,
) -> crate::utils::error::Result<Vec<ProcessHarvest>> {
// TODO: [PROC THREADS] Add threads
if let Ok((cpu_usage, cpu_fraction))<
|