Struct PidFd

pub struct PidFd { /* private fields */ }

🔬This is a nightly-only experimental API. (linux_pidfd #82971)

Available on Linux only.

This type represents a file descriptor that refers to a process.

A PidFd can be obtained by setting the corresponding option on Command with create_pidfd. Subsequently, the created pidfd can be retrieved from the Child by calling pidfd or into_pidfd.

Example:

#![feature(linux_pidfd)]
use std::os::linux::process::{CommandExt, ChildExt};
use std::process::Command;

let mut child = Command::new("echo")
    .create_pidfd(true)
    .spawn()
    .expect("Failed to spawn child");

let pidfd = child
    .into_pidfd()
    .expect("Failed to retrieve pidfd");

// The file descriptor will be closed when `pidfd` is dropped.

Refer to the man page of pidfd_open(2) for further details.

Implementations

impl PidFd

pub fn kill(&self) -> Result<()>

🔬This is a nightly-only experimental API. (linux_pidfd #82971)

Forces the child process to exit.

Unlike Child::kill it is possible to attempt to kill reaped children since PidFd does not suffer from pid recycling races. But doing so will return an Error.

pub fn wait(&self) -> Result<ExitStatus>

🔬This is a nightly-only experimental API. (linux_pidfd #82971)

Waits for the child to exit completely, returning the status that it exited with.

Unlike Child::wait it does not ensure that the stdin handle is closed. Additionally it will not return an ExitStatus if the child has already been reaped. Instead an error will be returned.

pub fn try_wait(&self) -> Result<Option<ExitStatus>>

🔬This is a nightly-only experimental API. (linux_pidfd #82971)

Attempts to collect the exit status of the child if it has already exited.

Unlike Child::try_wait this method will return an Error if the child has already been reaped.

Trait Implementations

impl AsFd for PidFd

fn as_fd(&self) -> BorrowedFd<'_>

Borrows the file descriptor.

impl AsRawFd for PidFd

fn as_raw_fd(&self) -> RawFd

Extracts the raw file descriptor.

impl Debug for PidFd

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl From<OwnedFd> for PidFd

fn from(fd: OwnedFd) -> Self

Converts to this type from the input type.

impl From<PidFd> for OwnedFd

fn from(pid_fd: PidFd) -> Self

Converts to this type from the input type.

impl FromRawFd for PidFd

unsafe fn from_raw_fd(fd: RawFd) -> Self

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

impl IntoRawFd for PidFd

fn into_raw_fd(self) -> RawFd

Consumes this object, returning the raw underlying file descriptor.