Required Methods

unsafe fn from_raw_fd(fd: RawFd) -> Self

Constructs a new instance of Self from the given raw file descriptor.

This function is typically used to consume ownership of the specified file descriptor. When used in this way, the returned object will take responsibility for closing it when the object goes out of scope.

However, consuming ownership is not strictly required. Use a [From<OwnedFd>::from] implementation for an API which strictly consumes ownership.

Safety

The fd passed in must be an owned file descriptor; in particular, it must be open.

Example

use std::fs::File;
# use std::io;
#[cfg(any(unix, target_os = "wasi"))]
use std::os::fd::{FromRawFd, IntoRawFd, RawFd};

let f = File::open("foo.txt")?;
# #[cfg(any(unix, target_os = "wasi"))]
let raw_fd: RawFd = f.into_raw_fd();
// SAFETY: no other functions should call `from_raw_fd`, so there
// is only one owner for the file descriptor.
# #[cfg(any(unix, target_os = "wasi"))]
let f = unsafe { File::from_raw_fd(raw_fd) };
# Ok::<(), io::Error>(())