all: replace package ioutil with os and io in src

For #45557

Change-Id: I56824135d86452603dd4ed4bab0e24c201bb0683
Reviewed-on: https://go-review.googlesource.com/c/go/+/426257
Run-TryBot: Ian Lance Taylor <iant@google.com>
Auto-Submit: Ian Lance Taylor <iant@google.com>
Run-TryBot: Andy Pan <panjf2000@gmail.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@google.com>

3 files changed, 5 insertions, 8 deletions

diff --git a/src/internal/fuzz/fuzz.go b/src/internal/fuzz/fuzz.go
index 3ccf74745f..9ce39cbcf0 100644
--- a/src/internal/fuzz/fuzz.go
+++ b/src/internal/fuzz/fuzz.go
@@ -14,7 +14,6 @@ import (
 	"fmt"
 	"internal/godebug"
 	"io"
-	"io/ioutil"
 	"math/bits"
 	"os"
 	"path/filepath"
@@ -963,7 +962,7 @@ func (e *MalformedCorpusError) Error() string {
 // be saved in a MalformedCorpusError and returned, along with the most recent
 // error.
 func ReadCorpus(dir string, types []reflect.Type) ([]CorpusEntry, error) {
-	files, err := ioutil.ReadDir(dir)
+	files, err := os.ReadDir(dir)
 	if os.IsNotExist(err) {
 		return nil, nil // No corpus to read
 	} else if err != nil {
@@ -981,7 +980,7 @@ func ReadCorpus(dir string, types []reflect.Type) ([]CorpusEntry, error) {
 			continue
 		}
 		filename := filepath.Join(dir, file.Name())
-		data, err := ioutil.ReadFile(filename)
+		data, err := os.ReadFile(filename)
 		if err != nil {
 			return nil, fmt.Errorf("failed to read corpus file: %v", err)
 		}
@@ -1038,7 +1037,7 @@ func writeToCorpus(entry *CorpusEntry, dir string) (err error) {
 	if err := os.MkdirAll(dir, 0777); err != nil {
 		return err
 	}
-	if err := ioutil.WriteFile(entry.Path, entry.Data, 0666); err != nil {
+	if err := os.WriteFile(entry.Path, entry.Data, 0666); err != nil {
 		os.Remove(entry.Path) // remove partially written file
 		return err
 	}
diff --git a/src/internal/fuzz/mem.go b/src/internal/fuzz/mem.go
index a5c3b02242..ea29b60607 100644
--- a/src/internal/fuzz/mem.go
+++ b/src/internal/fuzz/mem.go
@@ -6,7 +6,6 @@ package fuzz
 
 import (
 	"fmt"
-	"io/ioutil"
 	"os"
 	"unsafe"
 )
@@ -65,7 +64,7 @@ func sharedMemSize(valueSize int) int {
 // it into memory. The file will be removed when the Close method is called.
 func sharedMemTempFile(size int) (m *sharedMem, err error) {
 	// Create a temporary file.
-	f, err := ioutil.TempFile("", "fuzz-*")
+	f, err := os.CreateTemp("", "fuzz-*")
 	if err != nil {
 		return nil, err
 	}
diff --git a/src/internal/fuzz/worker.go b/src/internal/fuzz/worker.go
index 6e4c4e2d0f..fca3aea578 100644
--- a/src/internal/fuzz/worker.go
+++ b/src/internal/fuzz/worker.go
@@ -12,7 +12,6 @@ import (
 	"errors"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"os"
 	"os/exec"
 	"reflect"
@@ -958,7 +957,7 @@ func (wc *workerClient) Close() error {
 
 	// Drain fuzzOut and close it. When the server exits, the kernel will close
 	// its end of fuzzOut, and we'll get EOF.
-	if _, err := io.Copy(ioutil.Discard, wc.fuzzOut); err != nil {
+	if _, err := io.Copy(io.Discard, wc.fuzzOut); err != nil {
 		wc.fuzzOut.Close()
 		return err
 	}