rust/library/std/src/sys/process, branch beta

Fix spurious test timeout

2025-08-30T18:07:09+00:00

library: Migrate from `cfg_if` to `cfg_select`

2025-08-16T12:28:31+00:00

Migrate the standard library from using the external `cfg_if` crate to using the now-built-in `cfg_select` macro. This does not yet eliminate the dependency from `library/std/Cargo.toml`, because while the standard library itself no longer uses `cfg_if`, it also incorporates the `backtrace` crate, which does. Migration assisted by the following vim command (after selecting the full `cfg_if!` invocation): ``` '<,'>s/\(cfg_if::\)\?cfg_if/cfg_select/ | '<,'>s/^\( *\)} else {/\1}\r\1_ => {/c | '<,'>s/^\( *\)} else if #\[cfg(\(.*\))\] /\1}\r\1\2 => /e | '<,'>s/if #\[cfg(\(.*\))\] {/\1 => {/e ``` This is imperfect, but substantially accelerated the process. This prompts for confirmation on the `} else {` since that can also appear inside one of the arms. This also requires manual intervention to handle any multi-line conditions.

Replace unsafe function with safe alternative

2025-08-09T07:05:12+00:00

The `security_attributes` function is marked as safe despite taking a raw pointer which will later be used. Fortunately this function is only used internally and only in one place that has been basically the same for a decade now. However, we only ever set one bool so it's easy enough to replace with something that's actually safe.

Rollup merge of #142391 - LevitatingBusinessMan:setsid, r=workingjubilee

2025-07-11T05:35:17+00:00

rust: library: Add `setsid` method to `CommandExt` trait Add a setsid method to the CommandExt trait so that callers can create a process in a new session and process group whilst still using the POSIX spawn fast path. Tracking issue: rust-lang/rust#105376 ACP: https://github.com/rust-lang/libs-team/issues/184 This PR was previously submitted by ``@HarveyHunt`` (whom I marked as Co-Author in the commit message) in rust-lang/rust#105377. However that PR went stale. I applied the [suggestion](https://github.com/rust-lang/rust/pull/105377/files/231d19fcbfe155b2e85116865adae4253380ff1f#r1893457943) to change the function signature to `fn setsid(&mut self, setsid: bool) -> &mut Command`.

rust: library: Add setsid method to CommandExt trait

2025-07-10T03:26:58+00:00

Add a setsid method to the CommandExt trait so that callers can create a process in a new session and process group whilst still using the POSIX spawn fast path. Co-Authored-By: Harvey Hunt

update internal `send_signal` comment

2025-06-27T10:24:42+00:00

add ChildExt(::send_signal)

2025-06-18T04:38:55+00:00

std: add safety comments to `CStringArray`

2025-05-23T15:09:02+00:00

std: fix aliasing bug in UNIX process implementation

2025-05-23T15:09:00+00:00

`CStringArray` contained both `CString`s and their pointers. Unfortunately, since `CString` uses `Box`, moving the `CString`s into the `Vec` can (under stacked borrows) invalidate the pointer to the string, meaning the resulting `Vec<*const c_char>` was, from an opsem perspective, unusable. This PR removes removes the `Vec` from `CStringArray`, instead recreating the `CString`/`CStr` from the pointers when necessary. Also,`CStringArray` is now used for the process args as well, the old implementation was suffering from the same kind of bug.

Add `std::os::unix::process::CommandExt::chroot` to safely chroot a child process

2025-05-20T16:25:05+00:00

This adds a `chroot` method to the `CommandExt` extension trait for the `Command` builder, to set a directory to chroot into. This will chroot the child process into that directory right before calling chdir for the `Command`'s working directory. To avoid allowing a process to have a working directory outside of the chroot, if the `Command` does not yet have a working directory set, `chroot` will set its working directory to "/".