feat: Add signal related params to exec

internal/exec/pipe_linux.go

@@ -0,0 +1,48 @@
+package exec
+
+import (
+	"bufio"
+	"io"
+	"os/exec"
+	"syscall"
+	"time"
+
+	"github.com/AlexxIT/go2rtc/pkg/core"
+)
+
+// PipeCloser - return StdoutPipe that Kill cmd on Close call
+func PipeCloser(cmd *exec.Cmd, params *Params) (io.ReadCloser, error) {
+	stdout, err := cmd.StdoutPipe()
+	if err != nil {
+		return nil, err
+	}
+
+	// add buffer for pipe reader to reduce syscall
+	return pipeCloser{bufio.NewReaderSize(stdout, core.BufferSize), stdout, cmd, params}, nil
+}
+
+type pipeCloser struct {
+	io.Reader
+	io.Closer
+	cmd    *exec.Cmd
+	params *Params
+}
+
+func (p pipeCloser) Close() error {
+	finished := make(chan bool)
+
+	if p.params.KillSignal != syscall.SIGKILL {
+		go func() {
+			select {
+			case <-time.After(p.params.KillTimeout):
+				p.cmd.Process.Kill()
+				break
+			case <-finished:
+				break
+			}
+		}()
+	}
+	err := core.Any(p.Closer.Close(), p.cmd.Process.Signal(p.params.KillSignal), p.cmd.Wait())
+	finished <- true
+	return err
+}