Add app-server background terminal process APIs#26041
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| if !entry.initial_exec_command_returned { | ||
| return true; | ||
| } | ||
| store.remove(process_id) |
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When a terminal has already returned its initial exec_command, an agent can still have an in-flight write_stdin/empty poll that cloned the process handles before an app calls thread/backgroundTerminals/terminate. Removing the store entry here makes that in-flight poll wake up from termination and then hit ProcessStatus::Unknown in refresh_process_state, returning UnknownProcessId instead of a normal terminated/exited result; keep the entry visible until the active poll observes the exit, or otherwise let the poll finish with the stored metadata.
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Summary
Codex Apps needs app-server as the source of truth for chat-started background terminals instead of guessing from local process trees.
This PR adds experimental v2 APIs to list and terminate background terminals for a loaded thread using the app-server process id.
Changes
thread/backgroundTerminals/list, returningitemId, app-serverprocessId, command/cwd/runtime metadata, and nullable host OS/process metadata.thread/backgroundTerminals/terminateto terminate one running background terminal byprocessId.UnknownProcessIdafter app-initiated termination, and keep failed remote terminations retryable.