Isolate ffmpeg process group

internal/audio/record.go

@@ -7,6 +7,7 @@ import (
 	"os/exec"
 	"path/filepath"
 	"strings"
+	"syscall"
 	"time"
 )
 
@@ -31,6 +32,8 @@ func (r Recorder) Start(ctx context.Context) (*exec.Cmd, *RecordResult, error) {
 	args = append(args, "-ac", "1", "-ar", "16000", "-c:a", "pcm_s16le", wav)
 
 	cmd := exec.CommandContext(ctx, "ffmpeg", args...)
+	// Put ffmpeg in its own process group so Ctrl+C only targets the daemon.
+	cmd.SysProcAttr = &syscall.SysProcAttr{Setpgid: true}
 	if err := cmd.Start(); err != nil {
 		_ = os.RemoveAll(tmpdir)
 		return nil, nil, err

internal/daemon/daemon.go

@@ -8,6 +8,7 @@ import (
 	"os/exec"
 	"path/filepath"
 	"sync"
+	"syscall"
 	"time"
 
 	"lel/internal/aiprocess"
@@ -194,7 +195,7 @@ func (d *Daemon) stopAndProcess(reason string) {
 
 	d.log.Printf("stopping recording (%s)", reason)
 	if cmd.Process != nil {
-		_ = cmd.Process.Signal(os.Interrupt)
+		_ = syscall.Kill(-cmd.Process.Pid, syscall.SIGINT)
 	}
 	_ = audio.WaitWithTimeout(cmd, 5*time.Second)