# Trait std::os::fd::FromRawFd

1.1.0 · source ·

    pub trait FromRawFd {
        // Required method
        unsafe fn from_raw_fd(fd: RawFd) -> Self;
    }

Expand description

A trait to express the ability to construct an object from a raw file descriptor.

## Required Methods§

source

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

    let f = File::open("foo.txt")?;
    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.
    let f = unsafe { File::from_raw_fd(raw_fd) };

Run

## Object Safety§

This trait is not object safe.

## Implementors§

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### impl FromRawFd for File

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### impl FromRawFd for TcpListener

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### impl FromRawFd for TcpStream

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### impl FromRawFd for UdpSocket

1.2.0 · source§

### impl FromRawFd for Stdio

Available on Unix only.
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### impl FromRawFd for PidFd

Available on Linux only.
1.10.0 · source§

### impl FromRawFd for UnixDatagram

Available on Unix only.
1.10.0 · source§

### impl FromRawFd for UnixListener

Available on Unix only.
1.10.0 · source§

### impl FromRawFd for UnixStream

Available on Unix only.
1.63.0 · source§

### impl FromRawFd for OwnedFd

1.48.0 · source§

### impl FromRawFd for RawFd