Matthew Leach 1d79d6b2df process: refactor signal handling and fix action table sharing ...

This commit refactors the signal handling subsystem to address a bug in
process creation and to improve the separation of concerns between
signal delivery and signal disposition.

1. Fix Action Table Sharing:
Previously, the signal action table was wrapped in an `Arc`, causing
forked child processes to inadvertently share signal dispositions with
the parent. `SignalActionState` now contains a direct `SigActionSet` and
implements Clone, ensuring that processes receive a private copy of the
action table upon fork/clone.

2. Decouple Signal Selection from Execution:
The logic for selecting a pending signal has been moved from the
disposition state into a new `take_signal` method on `OwnedTask`. This
decouples the "taking" of a signal (respecting masks and priorities)
from the "actioning" of that signal. This is a prerequisite for
implementing ptrace.

3. Various cleanup bits:
- Renamed `SignalState` to `SignalActionState` to more accurately
  reflect that it manages signal dispositions.
- Removed the `pending` signal set out of the action state and directly
  into the `ThreadGroup` and `OwnedTask`.
- Renamed `set_pending` to `set_signal` for consistency.
- Simplified the signal delivery loop in `dispatch_userspace_task`
  using the new `take_signal` API.

2026-01-09 06:49:48 +00:00

..

signal

process: refactor signal handling and fix action table sharing

2026-01-09 06:49:48 +00:00

builder.rs

process: refactor signal handling and fix action table sharing

2026-01-09 06:49:48 +00:00

pid.rs

…

rsrc_lim.rs

…

signal.rs

process: refactor signal handling and fix action table sharing

2026-01-09 06:49:48 +00:00

umask.rs

…

wait.rs

syscalls: wait4: implement WNOHANG

2026-01-08 15:29:42 -08:00