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Phase 2: implement PTY open and fork in pty.rs

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Adds PtySpawner struct that calls openpty() for master/slave fds, forks,
and runs login_tty on the child side before it exits. Fixes nix feature
flag (pty module is gated by `term`, not a `pty` feature in nix 0.29).
Adds mock-claude workspace stub so the workspace resolves cleanly.

Unit test: fork_and_login_tty_does_not_panic passes (child exits 0).

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
This commit is contained in:
jedarden 2026-06-07 16:38:07 -04:00
parent 689edda117
commit 4a38e8f6a3
6 changed files with 396 additions and 1 deletions
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321
Cargo.lock generated
View file

@ -58,6 +58,24 @@ version = "1.0.102"
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@ -104,8 +122,11 @@ version = "0.1.0"
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@ -186,6 +315,31 @@ dependencies = [
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6
Cargo.toml
View file

@ -1,3 +1,6 @@
[workspace]
members = [".", "test-fixtures/mock-claude"]
[package]
name = "claude-print"
version = "0.1.0"
@ -17,6 +20,9 @@ serde = { version = "1.0.219", features = ["derive"] }
serde_json = "1.0.140"
thiserror = "2.0.12"
toml = "0.8.22"
nix = { version = "0.29", features = ["process", "signal", "fs", "ioctl", "term"] }
tempfile = "3.20"
libc = "0.2"
[profile.release]
opt-level = 3

1
src/lib.rs
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@ -1,3 +1,4 @@
pub mod cli;
pub mod config;
pub mod error;
pub mod pty;

60
src/pty.rs Normal file
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@ -0,0 +1,60 @@
use nix::pty::{openpty, OpenptyResult};
use nix::unistd::{fork, ForkResult, Pid};
use std::os::unix::io::{IntoRawFd, OwnedFd};
use crate::error::{Error, Result};
pub struct PtySpawner {
pub master: OwnedFd,
pub child_pid: Pid,
}
impl PtySpawner {
/// Open a PTY pair, fork, and call `login_tty` on the child so it becomes
/// the controlling terminal session leader. The child exits immediately
/// after login_tty. No exec is performed — that is deferred to a later phase.
pub fn spawn() -> Result<Self> {
let OpenptyResult { master, slave } = openpty(None, None)
.map_err(|e| Error::Internal(anyhow::anyhow!("openpty failed: {e}")))?;
// SAFETY: fork is async-signal-safe; no threads exist at this point in
// the single-threaded call path.
let fork_result = unsafe { fork() }
.map_err(|e| Error::Internal(anyhow::anyhow!("fork failed: {e}")))?;
match fork_result {
ForkResult::Parent { child } => {
drop(slave);
Ok(PtySpawner {
master,
child_pid: child,
})
}
ForkResult::Child => {
drop(master);
// login_tty(3): setsid, make slave the ctty, dup to stdio, close slave.
let slave_fd = slave.into_raw_fd();
// SAFETY: in child immediately after fork, single-threaded.
unsafe { libc::login_tty(slave_fd) };
std::process::exit(0);
}
}
}
}
#[cfg(test)]
mod tests {
use super::*;
use nix::sys::wait::{waitpid, WaitStatus};
#[test]
fn fork_and_login_tty_does_not_panic() {
let spawner = PtySpawner::spawn().expect("PtySpawner::spawn should succeed");
let status = waitpid(spawner.child_pid, None).expect("waitpid should succeed");
match status {
WaitStatus::Exited(_, code) => assert_eq!(code, 0, "child exited non-zero"),
other => panic!("unexpected wait status: {other:?}"),
}
}
}

8
test-fixtures/mock-claude/Cargo.toml Normal file
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@ -0,0 +1,8 @@
[package]
name = "mock-claude"
version = "0.1.0"
edition = "2021"
[[bin]]
name = "mock-claude"
path = "src/main.rs"

1
test-fixtures/mock-claude/src/main.rs Normal file
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@ -0,0 +1 @@
fn main() {}