Initial commit

examples/chan.rs

@@ -0,0 +1,46 @@
+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(())
+}