More advanced setns syscall

programs/contain/src/main.rs

@@ -1,18 +1,27 @@
 extern crate syscall;
 
 use std::fs::File;
-use std::io::{BufRead, BufReader};
+use std::io::{BufRead, BufReader, Read};
 
 pub fn main() {
-    let pid = unsafe { syscall::clone(syscall::CLONE_NEWNS).unwrap() };
+    let pid = unsafe { syscall::clone(0).unwrap() };
     if pid == 0 {
+        let rand = b"rand";
+        syscall::setns(&[[rand.as_ptr() as usize, rand.len()]]).unwrap();
+
         println!("Child Namespace:");
         let file = BufReader::new(File::open("sys:scheme").unwrap());
         for line in file.lines() {
             let line = line.unwrap();
             println!("{}", line);
         }
-        println!("");
+
+        let mut rand = File::open("rand:").unwrap();
+
+        let mut byte = [0];
+        rand.read(&mut byte).unwrap();
+
+        println!("Rand: {}", byte[0]);
     } else {
         let mut status = 0;
         syscall::waitpid(pid, &mut status, 0).unwrap();
@@ -23,6 +32,5 @@ pub fn main() {
             let line = line.unwrap();
             println!("{}", line);
         }
-        println!("");
     }
 }