0-reseed-threadrng.rs

use std::{fs, io::Write as _, process};

fn main() {
    let _ = rand::random::<u32>(); // initialize ThreadRng

    let parent_pid = process::id();

    unsafe { nix::unistd::fork() }.expect("fork failed");

    let filename = format!("out_{}_{}.txt", parent_pid, process::id());
    let mut f = fs::File::create(filename).expect("could not create file");

    for i in 0..64 {
        writeln!(f, "{:02}\t{}", i, rand::random::<u32>()).expect("could not write to file");
    }
}

1-out_13884_diff.txt

--- out_13884_13884.txt	2023-06-04 16:15:51
+++ out_13884_13946.txt	2023-06-04 16:15:51
@@ -61,4 +61,4 @@
 60	65424673
 61	3794020000
 62	3067067439
-63	365650879
+63	4036659996

Cargo.lock

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# It is not intended for manual editing.
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Cargo.toml

[package]
name = "reseed-threadrng"
version = "0.1.0"
edition = "2021"
publish = false

[[bin]]
name = "reseed-threadrng"
path = "0-reseed-threadrng.rs"

[dependencies]
nix = "0.26.2"
rand = "0.8.5"

out_13884_13884.txt

00	3783982018
01	406526761
02	599798609
03	1091621824
04	1431575904
05	3326531692
06	4278924660
07	470142879
08	3162189689
09	3179586422
10	3516564427
11	2889759026
12	3311226325
13	3520988473
14	2849876049
15	1075328657
16	3631730141
17	1297097035
18	1374881589
19	1587001849
20	3444933143
21	3436433103
22	3060571778
23	3705951655
24	3856879908
25	1850727388
26	187177798
27	3134255198
28	3416840891
29	2261848360
30	3783721500
31	2974613995
32	2241838541
33	91993926
34	3176613095
35	4167452852
36	3278357998
37	4031526536
38	131316144
39	1233587167
40	1553738062
41	1964748964
42	2842550088
43	2753937673
44	1138693857
45	1808157734
46	377645356
47	1506702466
48	1665128001
49	802996963
50	15511611
51	3115644975
52	2980790457
53	923387948
54	1143702588
55	3897732763
56	455464985
57	3626947410
58	418463823
59	2844909589
60	65424673
61	3794020000
62	3067067439
63	365650879

out_13884_13946.txt

00	3783982018
01	406526761
02	599798609
03	1091621824
04	1431575904
05	3326531692
06	4278924660
07	470142879
08	3162189689
09	3179586422
10	3516564427
11	2889759026
12	3311226325
13	3520988473
14	2849876049
15	1075328657
16	3631730141
17	1297097035
18	1374881589
19	1587001849
20	3444933143
21	3436433103
22	3060571778
23	3705951655
24	3856879908
25	1850727388
26	187177798
27	3134255198
28	3416840891
29	2261848360
30	3783721500
31	2974613995
32	2241838541
33	91993926
34	3176613095
35	4167452852
36	3278357998
37	4031526536
38	131316144
39	1233587167
40	1553738062
41	1964748964
42	2842550088
43	2753937673
44	1138693857
45	1808157734
46	377645356
47	1506702466
48	1665128001
49	802996963
50	15511611
51	3115644975
52	2980790457
53	923387948
54	1143702588
55	3897732763
56	455464985
57	3626947410
58	418463823
59	2844909589
60	65424673
61	3794020000
62	3067067439
63	4036659996