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
use std::error::Error;
use std::fs::OpenOptions;
use std::io::prelude::*;
pub fn parse(path: &str) -> Result<Vec<std::ops::Range<u64>>, Box<dyn Error>> {
let mut f = OpenOptions::new().read(true).open(path)?;
let mut buffer = String::new();
f.read_to_string(&mut buffer)?;
let mut ranges = Vec::new();
for line in buffer.split_terminator('\n') {
if !line.ends_with(" : System RAM") {
continue;
}
let mut line1 = line
.split_terminator(' ')
.next()
.expect("invalid iomem line")
.split_terminator('-');
let start = line1.next().expect("invalid range");
let end = line1.next().expect("invalid range end");
let start = u64::from_str_radix(start, 16)?;
let end = u64::from_str_radix(end, 16)?;
if start == 0 && end == 0 {
return Err(From::from("Need CAP_SYS_ADMIN to read /proc/iomem"));
}
ranges.push(start..end);
}
Ok(ranges)
}
#[cfg(test)]
mod tests {
#[test]
fn parse_iomem() {
let ranges = super::parse("test/iomem.txt").unwrap();
let expected = [
4096..654_335,
1_048_576..1_073_676_287,
4_294_967_296..6_979_321_855,
];
assert_eq!(ranges, expected);
let ranges = super::parse("test/iomem-2.txt").unwrap();
let expected = [
4096..655_359,
1_048_576..1_055_838_207,
1_056_026_624..1_073_328_127,
1_073_737_728..1_073_741_823,
4_294_967_296..6_979_321_855,
];
assert_eq!(ranges, expected);
}
}