// Copyright 2012-2014 The Rust Project Developers. See the COPYRIGHT // file at the top-level directory of this distribution and at // http://rust-lang.org/COPYRIGHT. // // Licensed under the Apache License, Version 2.0 or the MIT license // , at your // option. This file may not be copied, modified, or distributed // except according to those terms. #![feature(rustc_private)] extern crate rustc_back; use std::fs::File; use std::io::{Read, Write}; use rustc_back::tempdir::TempDir; #[cfg(unix)] fn switch_stdout_to(file: File) { use std::os::unix::prelude::*; extern { fn dup2(old: i32, new: i32) -> i32; } unsafe { assert_eq!(dup2(file.as_raw_fd(), 1), 1); } } #[cfg(windows)] fn switch_stdout_to(file: File) { use std::os::windows::prelude::*; extern "system" { fn SetStdHandle(nStdHandle: u32, handle: *mut u8) -> i32; } const STD_OUTPUT_HANDLE: u32 = (-11i32) as u32; unsafe { let rc = SetStdHandle(STD_OUTPUT_HANDLE, file.into_raw_handle() as *mut _); assert!(rc != 0); } } fn main() { let td = TempDir::new("foo").unwrap(); let path = td.path().join("bar"); let f = File::create(&path).unwrap(); println!("foo"); std::io::stdout().flush().unwrap(); switch_stdout_to(f); println!("bar"); std::io::stdout().flush().unwrap(); let mut contents = String::new(); File::open(&path).unwrap().read_to_string(&mut contents).unwrap(); assert_eq!(contents, "bar\n"); }