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#![cfg(any(target_family = "unix", target_family = "windows"))]
use std::fs::File;
use std::io::{Read, Write};
mod common;
#[cfg(unix)]
fn switch_stdout_to(file: File) {
use std::os::unix::prelude::*;
extern "C" {
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);
}
}
#[test]
fn switch_stdout() {
let temp = common::tmpdir();
let path = temp.join("switch-stdout-output");
let f = File::create(&path).unwrap();
let mut stdout = std::io::stdout();
stdout.write(b"foo\n").unwrap();
stdout.flush().unwrap();
switch_stdout_to(f);
stdout.write(b"bar\n").unwrap();
stdout.flush().unwrap();
let mut contents = String::new();
File::open(&path).unwrap().read_to_string(&mut contents).unwrap();
assert_eq!(contents, "bar\n");
}
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