Stderr in std::io - Rust (original) (raw)
Struct Stderr
1.0.0 · Source
pub struct Stderr { /* private fields */ }Expand description
A handle to the standard error stream of a process.
For more information, see the io::stderr method.
§Note: Windows Portability Considerations
When operating in a console, the Windows implementation of this stream does not support non-UTF-8 byte sequences. Attempting to write bytes that are not valid UTF-8 will return an error.
In a process with a detached console, such as one using#![windows_subsystem = "windows"], or in a child process spawned from such a process, the contained handle will be null. In such cases, the standard library’s Read andWrite will do nothing and silently succeed. All other I/O operations, via the standard library or via raw Windows API calls, will fail.
1.0.0 · Source
Locks this handle to the standard error stream, returning a writable guard.
The lock is released when the returned lock goes out of scope. The returned guard also implements the Write trait for writing data.
§Examples
use std::io::{self, Write};
fn foo() -> io::Result<()> {
let stderr = io::stderr();
let mut handle = stderr.lock();
handle.write_all(b"hello world")?;
Ok(())
}Available on Windows only.
Available on Windows only.
Redirect command stdout/stderr to our stderr
§Examples
#![feature(exit_status_error)]
use std::io;
use std::process::Command;
let output = Command::new("whoami")
.stdout(io::stderr())
.output()?;
output.status.exit_ok()?;
assert!(output.stdout.is_empty());Returns true if the descriptor/handle refers to a terminal/tty. Read more
Writes a buffer into this writer, returning how many bytes were written. Read more
Like write, except that it writes from a slice of buffers. Read more
🔬This is a nightly-only experimental API. (can_vector #69941)
Flushes this output stream, ensuring that all intermediately buffered contents reach their destination. Read more
Attempts to write an entire buffer into this writer. Read more
🔬This is a nightly-only experimental API. (write_all_vectored #70436)
Attempts to write multiple buffers into this writer. Read more
Writes a formatted string into this writer, returning any error encountered. Read more
Creates a “by reference” adapter for this instance of Write. Read more
Writes a buffer into this writer, returning how many bytes were written. Read more
Like write, except that it writes from a slice of buffers. Read more
🔬This is a nightly-only experimental API. (can_vector #69941)
Flushes this output stream, ensuring that all intermediately buffered contents reach their destination. Read more
Attempts to write an entire buffer into this writer. Read more
🔬This is a nightly-only experimental API. (write_all_vectored #70436)
Attempts to write multiple buffers into this writer. Read more
Writes a formatted string into this writer, returning any error encountered. Read more
Creates a “by reference” adapter for this instance of Write. Read more