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