Tracking Issue for `std::os::fd::CommandExt::fd`

Feature gate: #![feature(command_pass_fds)]

This is a tracking issue for passing file descriptors in std::comand::Command with std::os::fd::CommandExt::fd.

Public API

// std::os::unix::process

pub trait CommandExt {
    fn fd(&mut self, new_fd: RawFd, old_fd: impl Into<OwnedFd>);
}

impl CommandExt for std::process::Command { ... }

Note: if a lifetime can be introduced to std::process::Command at any time in the future, we should make this use BorrowedFd.

Steps / History

• Feature request: https://github.com/rust-lang/rust/issues/144191
• API change proposal: https://github.com/rust-lang/libs-team/issues/623

(Remember to update the S-tracking-* label when checking boxes.)

• Implementation: None yet
• Final comment period (FCP)^1
• Stabilization PR

Unresolved Questions

• Whether to name the function fd or pass_fd
• Is this also available on cfg(any(target_os = "hermit", target_os = "trusty", target_os = "wasi"))?

Start with the proposed std::os::unix::process::CommandExt API and read the linked feature request and API change proposal. The implementation is not started; completion requires resolving the function-name and platform-availability questions, followed by implementation, FCP, and a stabilization PR.