Kill asks the host to signal at once and says when a shell has no job to signal

Kill queued a signal effect for later, so the job it saw running by its marks
could have ended, and another started, before the signal went; and with job
control off the job shares the shell's process group, so the host skipped it
and Kill reported nothing. Kill now calls the host's kill_job while it holds the
turn, and when the only job is the shell's own group says 'Kill: no job to
signal', which also fails a write of Kill to ctl.

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

1 files changed, 8 insertions, 0 deletions

diff --git a/src/gui/gui.zig b/src/gui/gui.zig
index 2369dd28..6978284b 100644
--- a/src/gui/gui.zig
+++ b/src/gui/gui.zig
@@ -3841,6 +3841,7 @@ const Shell = struct {
         .pty_signal = ptySignal,
         .close_pty = closePaneShell,
         .tty_taken = ttyTaken,
+        .kill_job = killJob,
         .write_file = writeFile,
         .write_dump = writeDump,
         .watch_file = watchFile,
@@ -4196,6 +4197,13 @@ fn ttyTaken(ctx: ?*anyopaque, pane: u8) bool {
     return host_io.ttyTaken(pt.pid, pt.fd);
 }
 
+fn killJob(ctx: ?*anyopaque, pane: u8) bool {
+    const s = shellOf(ctx);
+    const pt = s.ptys[pane] orelse return false;
+    if (pt.fd < 0) return false;
+    return host_io.killJob(pt.pid, pt.fd);
+}
+
 fn writeFile(ctx: ?*anyopaque, pane: u8, path: []const u8, bytes: []const u8) void {
     const s = shellOf(ctx);
     filesystem.write(s.core, path, bytes) catch |err|