Adding upstream version 1.34.4.

Signed-off-by: Daniel Baumann <daniel@debian.org>

plugins/inputs/execd/shim/shim_posix_test.go

@@ -0,0 +1,62 @@
+//go:build !windows
+
+package shim
+
+import (
+	"bufio"
+	"context"
+	"io"
+	"os"
+	"syscall"
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestShimUSR1SignalingWorks(t *testing.T) {
+	stdinReader, stdinWriter := io.Pipe()
+	stdoutReader, stdoutWriter := io.Pipe()
+
+	ctx, cancel := context.WithCancel(t.Context())
+	defer cancel()
+	metricProcessed, exited := runInputPlugin(t, 20*time.Minute, stdinReader, stdoutWriter, nil)
+
+	// signal USR1 to yourself.
+	pid := os.Getpid()
+	process, err := os.FindProcess(pid)
+	require.NoError(t, err)
+
+	go func() {
+		// On slow machines this signal can fire before the service comes up.
+		// rather than depend on accurate sleep times, we'll just retry sending
+		// the signal every so often until it goes through.
+		for {
+			select {
+			case <-ctx.Done():
+				return // test is done
+			default:
+				// test isn't done, keep going.
+				if err := process.Signal(syscall.SIGUSR1); err != nil {
+					t.Error(err)
+					metricProcessed <- false
+					return
+				}
+				time.Sleep(200 * time.Millisecond)
+			}
+		}
+	}()
+
+	<-metricProcessed
+	cancel()
+
+	r := bufio.NewReader(stdoutReader)
+	out, err := r.ReadString('\n')
+	require.NoError(t, err)
+	require.Equal(t, "measurement,tag=tag field=1i 1234000005678\n", out)
+
+	require.NoError(t, stdinWriter.Close())
+	readUntilEmpty(r)
+
+	<-exited
+}