| // run-pass |
| |
| use std::env; |
| use std::fs::File; |
| use std::io::{Read, Write}; |
| use std::path::PathBuf; |
| |
| #[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 path = PathBuf::from(env::var_os("RUST_TEST_TMPDIR").unwrap()); |
| let path = path.join("switch-stdout-output"); |
| 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"); |
| } |