Kill signals a command only while it runs, and only the pane it was meant for

A signal effect carried only a slot, so a Kill followed in the same step by
the pane's closing and its slot's reuse signalled the new pane's child; and a
command pane whose child had exited and been reaped kept a process group id
another process could take. The effect now carries the pane's serial, checked
as it is performed, and a host signals no command whose exit it has recorded;
the core already sends Kill only to a command it has not been told is done.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

1 files changed, 1 insertions, 1 deletions

diff --git a/src/ninep/pty.zig b/src/ninep/pty.zig
index 6065dab2..88dafdfc 100644
--- a/src/ninep/pty.zig
+++ b/src/ninep/pty.zig
@@ -65,7 +65,7 @@ fn verb(p: *Pardes, id: usize, line: []const u8, apply: bool) bool {
             const which = signalNamed(words.next() orelse return false) orelse return false;
             if (words.next() != null) return false;
             if (!apply) return true;
-            p.emit(.{ .signal_pty = .{ .pane = @intCast(id), .sig = which } });
+            p.emit(.{ .signal_pty = .{ .pane = @intCast(id), .serial = pane.serial, .sig = which } });
         },
         .exec => {
             if (words.next() != null) return false;