Function dup2_stdout

pub fn dup2_stdout<Fd: AsFd>(fd: Fd) -> Result<()>

Duplicate fd with Stdout, i.e., Stdout redirection.

Examples

Redirect the Stdout to file foo and restore it:

use nix::fcntl::open;
use nix::fcntl::OFlag;
use nix::sys::stat::Mode;
use nix::unistd::dup;
use nix::unistd::dup2_stdout;
use std::io::{stdout, Write};

let mut stdout = stdout();

// Save the previous Stdout so that we can restore it
let saved_stdout = dup(&stdout).unwrap();
let foo = open(
    "foo",
    OFlag::O_RDWR | OFlag::O_CLOEXEC | OFlag::O_CREAT | OFlag::O_EXCL,
    Mode::S_IRWXU,
)
.unwrap();
// Now our Stdout has been redirected to file foo
dup2_stdout(foo).unwrap();
// Let's say hi to foo
// NOTE: add a newline here to flush the buffer
stdout.write(b"Hi, foo!\n").unwrap();

// Restore the Stdout
dup2_stdout(saved_stdout).unwrap();

// Let's say hi to Stdout
// NOTE: add a newline here to flush the buffer
stdout.write(b"Hi, Stdout!\n").unwrap();