# Trait std::os::wasi::io::FromRawFd
1.1.0[−][src]

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

This is supported on WASI only.
Expand description

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

## Required methods

[src]

#### unsafe fn from_raw_fd(fd: RawFd) -> Self

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

This function consumes ownership of the specified file descriptor. The returned object will take responsibility for closing it when the object goes out of scope.

This function is also unsafe as the primitives currently returned have the contract that they are the sole owner of the file descriptor they are wrapping. Usage of this function could accidentally allow violating this contract which can cause memory unsafety in code that relies on it being true.

##### Example

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

## Implementors

[src]

### impl FromRawFd for File

[src]

### impl FromRawFd for TcpListener

[src]

### impl FromRawFd for TcpStream

[src]

### impl FromRawFd for UdpSocket

1.2.0[src]

### impl FromRawFd for Stdio

This is supported on Unix only.
[src]

### impl FromRawFd for PidFd

This is supported on Linux only.
[src]

### impl FromRawFd for OwnedFd

1.10.0[src]

### impl FromRawFd for UnixDatagram

This is supported on Unix only.
1.10.0[src]

### impl FromRawFd for UnixListener

This is supported on Unix only.
1.10.0[src]

### impl FromRawFd for UnixStream

This is supported on Unix only.
1.48.0[src]

### impl FromRawFd for RawFd