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#![allow(clippy::expect_used)]
#![allow(clippy::unwrap_used)]
#![allow(clippy::panic)]
#![allow(clippy::uninlined_format_args)]
#![allow(clippy::match_wild_err_arm)]
/// run with `cargo run --example example_pipe`
use std::{
io::prelude::*,
process::{Command, Stdio, exit},
};
use fork::{Fork, fork, setsid};
use os_pipe::pipe;
fn main() {
// Create a pipe for communication
let (mut reader, writer) = pipe().expect("Failed to create pipe");
match fork() {
Ok(Fork::Child) => match fork() {
Ok(Fork::Child) => {
setsid().expect("Failed to setsid");
match Command::new("sleep")
.arg("300")
.stdin(Stdio::null())
.stdout(Stdio::null())
.stderr(Stdio::null())
.spawn()
{
Ok(child) => {
println!("Child pid: {}", child.id());
// Write child pid to the pipe
let mut writer = writer; // Shadowing to prevent move errors
writeln!(writer, "{}", child.id()).expect("Failed to write to pipe");
exit(0);
}
Err(e) => {
eprintln!("Error running command: {:?}", e);
exit(1);
}
}
}
Ok(Fork::Parent(_)) => exit(0),
Err(e) => {
eprintln!("Error spawning process: {:?}", e);
exit(1)
}
},
Ok(Fork::Parent(_)) => {
drop(writer);
// Read the child pid from the pipe
let mut child_pid_str = String::new();
reader
.read_to_string(&mut child_pid_str)
.expect("Failed to read from pipe");
if let Ok(child_pid) = child_pid_str.trim().parse::<i32>() {
println!("Received child pid: {}", child_pid);
} else {
eprintln!("Failed to parse child pid");
}
}
Err(e) => eprintln!("Error spawning process: {:?}", e),
}
}
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