libgo: update to Go1.18rc1 release

Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/386594

3 files changed, 50 insertions, 14 deletions

diff --git a/libgo/go/os/example_test.go b/libgo/go/os/example_test.go
index e8554b0..53e3c52 100644
--- a/libgo/go/os/example_test.go
+++ b/libgo/go/os/example_test.go
@@ -241,3 +241,25 @@ func ExampleWriteFile() {
 		log.Fatal(err)
 	}
 }
+
+func ExampleMkdir() {
+	err := os.Mkdir("testdir", 0750)
+	if err != nil && !os.IsExist(err) {
+		log.Fatal(err)
+	}
+	err = os.WriteFile("testdir/testfile.txt", []byte("Hello, Gophers!"), 0660)
+	if err != nil {
+		log.Fatal(err)
+	}
+}
+
+func ExampleMkdirAll() {
+	err := os.MkdirAll("test/subdir", 0750)
+	if err != nil && !os.IsExist(err) {
+		log.Fatal(err)
+	}
+	err = os.WriteFile("test/subdir/testfile.txt", []byte("Hello, Gophers!"), 0660)
+	if err != nil {
+		log.Fatal(err)
+	}
+}
diff --git a/libgo/go/os/os_test.go b/libgo/go/os/os_test.go
index e90b89d..59e4fb6 100644
--- a/libgo/go/os/os_test.go
+++ b/libgo/go/os/os_test.go
@@ -28,6 +28,16 @@ import (
 	"time"
 )
 
+func TestMain(m *testing.M) {
+	if Getenv("GO_OS_TEST_DRAIN_STDIN") == "1" {
+		os.Stdout.Close()
+		io.Copy(io.Discard, os.Stdin)
+		Exit(0)
+	}
+
+	Exit(m.Run())
+}
+
 var dot = []string{
 	"dir.go",
 	"env.go",
@@ -2261,9 +2271,18 @@ func testKillProcess(t *testing.T, processKiller func(p *Process)) {
 	testenv.MustHaveExec(t)
 	t.Parallel()
 
-	// Re-exec the test binary itself to emulate "sleep 1".
-	cmd := osexec.Command(Args[0], "-test.run", "TestSleep")
-	err := cmd.Start()
+	// Re-exec the test binary to start a process that hangs until stdin is closed.
+	cmd := osexec.Command(Args[0])
+	cmd.Env = append(os.Environ(), "GO_OS_TEST_DRAIN_STDIN=1")
+	stdout, err := cmd.StdoutPipe()
+	if err != nil {
+		t.Fatal(err)
+	}
+	stdin, err := cmd.StdinPipe()
+	if err != nil {
+		t.Fatal(err)
+	}
+	err = cmd.Start()
 	if err != nil {
 		t.Fatalf("Failed to start test process: %v", err)
 	}
@@ -2272,19 +2291,14 @@ func testKillProcess(t *testing.T, processKiller func(p *Process)) {
 		if err := cmd.Wait(); err == nil {
 			t.Errorf("Test process succeeded, but expected to fail")
 		}
+		stdin.Close() // Keep stdin alive until the process has finished dying.
 	}()
 
-	time.Sleep(100 * time.Millisecond)
-	processKiller(cmd.Process)
-}
+	// Wait for the process to be started.
+	// (It will close its stdout when it reaches TestMain.)
+	io.Copy(io.Discard, stdout)
 
-// TestSleep emulates "sleep 1". It is a helper for testKillProcess, so we
-// don't have to rely on an external "sleep" command being available.
-func TestSleep(t *testing.T) {
-	if testing.Short() {
-		t.Skip("Skipping in short mode")
-	}
-	time.Sleep(time.Second)
+	processKiller(cmd.Process)
 }
 
 func TestKillStartProcess(t *testing.T) {
diff --git a/libgo/go/os/tempfile.go b/libgo/go/os/tempfile.go
index 5b681fc..3be3d13 100644
--- a/libgo/go/os/tempfile.go
+++ b/libgo/go/os/tempfile.go
@@ -46,7 +46,7 @@ func CreateTemp(dir, pattern string) (*File, error) {
 			if try++; try < 10000 {
 				continue
 			}
-			return nil, &PathError{Op: "createtemp", Path: dir + string(PathSeparator) + prefix + "*" + suffix, Err: ErrExist}
+			return nil, &PathError{Op: "createtemp", Path: prefix + "*" + suffix, Err: ErrExist}
 		}
 		return f, err
 	}