jD91mZM2
47 lines
1.1 KiB
Rust
47 lines
1.1 KiB
Rust
extern crate syscall;
|
|
|
|
use std::{
|
|
fs::File,
|
|
io::{self, prelude::*},
|
|
os::unix::io::{AsRawFd, FromRawFd},
|
|
thread,
|
|
time::Duration
|
|
};
|
|
|
|
fn from_syscall_error(error: syscall::Error) -> io::Error {
|
|
io::Error::from_raw_os_error(error.errno as i32)
|
|
}
|
|
|
|
fn main() -> io::Result<()> {
|
|
let server = File::create("chan:hello_world")?;
|
|
let mut client = File::open("chan:hello_world")?;
|
|
|
|
let dup = syscall::dup(server.as_raw_fd(), b"listen").map_err(from_syscall_error)?;
|
|
let mut dup = unsafe { File::from_raw_fd(dup) };
|
|
|
|
dup.write(b"abc")?;
|
|
dup.flush()?;
|
|
|
|
let mut buf = [0; 5];
|
|
assert_eq!(client.read(&mut buf)?, 3);
|
|
assert_eq!(&buf[..3], b"abc");
|
|
|
|
// Tada, you can clone handles properly!
|
|
let mut client_clone = client.try_clone()?;
|
|
|
|
let thread = thread::spawn(move || -> io::Result<()> {
|
|
thread::sleep(Duration::from_secs(1));
|
|
client_clone.write(b"def")?;
|
|
client_clone.flush()?;
|
|
Ok(())
|
|
});
|
|
|
|
let mut buf = [0; 5];
|
|
assert_eq!(dup.read(&mut buf)?, 3);
|
|
assert_eq!(&buf[..3], b"def");
|
|
|
|
thread.join().unwrap().unwrap();
|
|
|
|
Ok(())
|
|
}
|