Created
July 17, 2020 14:46
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A process that repeatedly executes itself
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use std::process::Command; | |
use std::env; | |
use std::process; | |
use std::time::SystemTime; | |
use crossbeam; // 0.7.3; | |
pub fn main() { | |
let myself = env::current_exe().expect("no current exe"); | |
let n: u64 = env::args() | |
.enumerate() | |
.find(|&(i, _)| i == 1) | |
.and_then(|(_, s)| s.parse().ok()) | |
.unwrap_or(0); | |
crossbeam::scope(|s| { | |
loop{ | |
s.spawn( |_| { | |
loop{ | |
let res = Command::new(&myself) | |
.args( &[ (n+1).to_string() ] ) | |
.spawn() | |
.expect("failed to execute process"); | |
println!("{}spawned process {} from {} (generation {}) (time: {:?})", | |
Spaces(n), | |
res.id(), | |
process::id(), | |
n, | |
SystemTime::now() | |
); | |
} | |
}); | |
} | |
}).expect("no scope"); | |
} | |
struct Spaces(u64); | |
impl std::fmt::Display for Spaces { | |
fn fmt(&self, f:&mut std::fmt::Formatter<'_>) -> std::fmt::Result { | |
for _ in 0..self.0 { | |
f.write_str(" ")? | |
} | |
Ok(()) | |
} | |
} |
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