9 files changed, 22 insertions, 16 deletions
diff --git a/src/os/exec/example_test.go b/src/os/exec/example_test.go
index 62866fa710..a66890be69 100644
--- a/src/os/exec/example_test.go
+++ b/src/os/exec/example_test.go
@@ -10,7 +10,6 @@ import (
 	"encoding/json"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"log"
 	"os"
 	"os/exec"
@@ -128,7 +127,7 @@ func ExampleCmd_StderrPipe() {
 		log.Fatal(err)
 	}
 
-	slurp, _ := ioutil.ReadAll(stderr)
+	slurp, _ := io.ReadAll(stderr)
 	fmt.Printf("%s\n", slurp)
 
 	if err := cmd.Wait(); err != nil {
diff --git a/src/os/exec/exec_plan9.go b/src/os/exec/exec_plan9.go
index d90bd04399..21ac7b765f 100644
--- a/src/os/exec/exec_plan9.go
+++ b/src/os/exec/exec_plan9.go
@@ -4,14 +4,14 @@
 
 package exec
 
-import "os"
+import "io/fs"
 
 func init() {
 	skipStdinCopyError = func(err error) bool {
 		// Ignore hungup errors copying to stdin if the program
 		// completed successfully otherwise.
 		// See Issue 35753.
-		pe, ok := err.(*os.PathError)
+		pe, ok := err.(*fs.PathError)
 		return ok &&
 			pe.Op == "write" && pe.Path == "|1" &&
 			pe.Err.Error() == "i/o on hungup channel"
diff --git a/src/os/exec/exec_test.go b/src/os/exec/exec_test.go
index dafbc64a17..cd3d759ebc 100644
--- a/src/os/exec/exec_test.go
+++ b/src/os/exec/exec_test.go
@@ -605,6 +605,10 @@ func TestExtraFiles(t *testing.T) {
 	testenv.MustHaveExec(t)
 	testenv.MustHaveGoBuild(t)
 
+	// This test runs with cgo disabled. External linking needs cgo, so
+	// it doesn't work if external linking is required.
+	testenv.MustInternalLink(t)
+
 	if runtime.GOOS == "windows" {
 		t.Skipf("skipping test on %q", runtime.GOOS)
 	}
@@ -633,7 +637,7 @@ func TestExtraFiles(t *testing.T) {
 	// cgo), to make sure none of that potential C code leaks fds.
 	ts := httptest.NewUnstartedServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {}))
 	// quiet expected TLS handshake error "remote error: bad certificate"
-	ts.Config.ErrorLog = log.New(ioutil.Discard, "", 0)
+	ts.Config.ErrorLog = log.New(io.Discard, "", 0)
 	ts.StartTLS()
 	defer ts.Close()
 	_, err = http.Get(ts.URL)
@@ -826,7 +830,7 @@ func TestHelperProcess(*testing.T) {
 			}
 		}
 	case "stdinClose":
-		b, err := ioutil.ReadAll(os.Stdin)
+		b, err := io.ReadAll(os.Stdin)
 		if err != nil {
 			fmt.Fprintf(os.Stderr, "Error: %v\n", err)
 			os.Exit(1)
diff --git a/src/os/exec/exec_unix.go b/src/os/exec/exec_unix.go
index 9c3e17d23a..51c52427c2 100644
--- a/src/os/exec/exec_unix.go
+++ b/src/os/exec/exec_unix.go
@@ -7,7 +7,7 @@
 package exec
 
 import (
-	"os"
+	"io/fs"
 	"syscall"
 )
 
@@ -16,7 +16,7 @@ func init() {
 		// Ignore EPIPE errors copying to stdin if the program
 		// completed successfully otherwise.
 		// See Issue 9173.
-		pe, ok := err.(*os.PathError)
+		pe, ok := err.(*fs.PathError)
 		return ok &&
 			pe.Op == "write" && pe.Path == "|1" &&
 			pe.Err == syscall.EPIPE
diff --git a/src/os/exec/exec_windows.go b/src/os/exec/exec_windows.go
index af8cd97218..bb937f8aed 100644
--- a/src/os/exec/exec_windows.go
+++ b/src/os/exec/exec_windows.go
@@ -5,7 +5,7 @@
 package exec
 
 import (
-	"os"
+	"io/fs"
 	"syscall"
 )
 
@@ -15,7 +15,7 @@ func init() {
 		// to stdin if the program completed successfully otherwise.
 		// See Issue 20445.
 		const _ERROR_NO_DATA = syscall.Errno(0xe8)
-		pe, ok := err.(*os.PathError)
+		pe, ok := err.(*fs.PathError)
 		return ok &&
 			pe.Op == "write" && pe.Path == "|1" &&
 			(pe.Err == syscall.ERROR_BROKEN_PIPE || pe.Err == _ERROR_NO_DATA)
diff --git a/src/os/exec/lp_plan9.go b/src/os/exec/lp_plan9.go
index 5860cbca4d..e8826a5083 100644
--- a/src/os/exec/lp_plan9.go
+++ b/src/os/exec/lp_plan9.go
@@ -6,6 +6,7 @@ package exec
 
 import (
 	"errors"
+	"io/fs"
 	"os"
 	"path/filepath"
 	"strings"
@@ -22,7 +23,7 @@ func findExecutable(file string) error {
 	if m := d.Mode(); !m.IsDir() && m&0111 != 0 {
 		return nil
 	}
-	return os.ErrPermission
+	return fs.ErrPermission
 }
 
 // LookPath searches for an executable named file in the
diff --git a/src/os/exec/lp_unix.go b/src/os/exec/lp_unix.go
index 93793e0eee..66c1df76fb 100644
--- a/src/os/exec/lp_unix.go
+++ b/src/os/exec/lp_unix.go
@@ -8,6 +8,7 @@ package exec
 
 import (
 	"errors"
+	"io/fs"
 	"os"
 	"path/filepath"
 	"strings"
@@ -24,7 +25,7 @@ func findExecutable(file string) error {
 	if m := d.Mode(); !m.IsDir() && m&0111 != 0 {
 		return nil
 	}
-	return os.ErrPermission
+	return fs.ErrPermission
 }
 
 // LookPath searches for an executable named file in the
diff --git a/src/os/exec/lp_windows.go b/src/os/exec/lp_windows.go
index 9ea3d76575..e7a2cdf142 100644
--- a/src/os/exec/lp_windows.go
+++ b/src/os/exec/lp_windows.go
@@ -6,6 +6,7 @@ package exec
 
 import (
 	"errors"
+	"io/fs"
 	"os"
 	"path/filepath"
 	"strings"
@@ -20,7 +21,7 @@ func chkStat(file string) error {
 		return err
 	}
 	if d.IsDir() {
-		return os.ErrPermission
+		return fs.ErrPermission
 	}
 	return nil
 }
@@ -47,7 +48,7 @@ func findExecutable(file string, exts []string) (string, error) {
 			return f, nil
 		}
 	}
-	return "", os.ErrNotExist
+	return "", fs.ErrNotExist
 }
 
 // LookPath searches for an executable named file in the
diff --git a/src/os/exec/read3.go b/src/os/exec/read3.go
index 25d732a991..8852023e77 100644
--- a/src/os/exec/read3.go
+++ b/src/os/exec/read3.go
@@ -15,7 +15,7 @@ package main
 import (
 	"fmt"
 	"internal/poll"
-	"io/ioutil"
+	"io"
 	"os"
 	"os/exec"
 	"runtime"
@@ -24,7 +24,7 @@ import (
 
 func main() {
 	fd3 := os.NewFile(3, "fd3")
-	bs, err := ioutil.ReadAll(fd3)
+	bs, err := io.ReadAll(fd3)
 	if err != nil {
 		fmt.Printf("ReadAll from fd 3: %v\n", err)
 		os.Exit(1)