all: update to use os.ReadFile, os.WriteFile, os.CreateTemp, os.MkdirTemp

As part of #42026, these helpers from io/ioutil were moved to os.
(ioutil.TempFile and TempDir became os.CreateTemp and MkdirTemp.)

Update the Go tree to use the preferred names.

As usual, code compiled with the Go 1.4 bootstrap toolchain
and code vendored from other sources is excluded.

ReadDir changes are in a separate CL, because they are not a
simple search and replace.

For #42026.

Change-Id: If318df0216d57e95ea0c4093b89f65e5b0ababb3
Reviewed-on: https://go-review.googlesource.com/c/go/+/266365
Trust: Russ Cox <rsc@golang.org>
Run-TryBot: Russ Cox <rsc@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>

3 files changed, 5 insertions, 7 deletions

diff --git a/src/runtime/pprof/pprof_test.go b/src/runtime/pprof/pprof_test.go
index b807072485..b6ee160e84 100644
--- a/src/runtime/pprof/pprof_test.go
+++ b/src/runtime/pprof/pprof_test.go
@@ -13,7 +13,6 @@ import (
 	"internal/profile"
 	"internal/testenv"
 	"io"
-	"io/ioutil"
 	"math/big"
 	"os"
 	"os/exec"
@@ -1179,7 +1178,7 @@ func TestLabelRace(t *testing.T) {
 // Check that there is no deadlock when the program receives SIGPROF while in
 // 64bit atomics' critical section. Used to happen on mips{,le}. See #20146.
 func TestAtomicLoadStore64(t *testing.T) {
-	f, err := ioutil.TempFile("", "profatomic")
+	f, err := os.CreateTemp("", "profatomic")
 	if err != nil {
 		t.Fatalf("TempFile: %v", err)
 	}
@@ -1208,7 +1207,7 @@ func TestAtomicLoadStore64(t *testing.T) {
 func TestTracebackAll(t *testing.T) {
 	// With gccgo, if a profiling signal arrives at the wrong time
 	// during traceback, it may crash or hang. See issue #29448.
-	f, err := ioutil.TempFile("", "proftraceback")
+	f, err := os.CreateTemp("", "proftraceback")
 	if err != nil {
 		t.Fatalf("TempFile: %v", err)
 	}
diff --git a/src/runtime/pprof/proto.go b/src/runtime/pprof/proto.go
index 8519af6985..bdb4454b6e 100644
--- a/src/runtime/pprof/proto.go
+++ b/src/runtime/pprof/proto.go
@@ -9,7 +9,7 @@ import (
 	"compress/gzip"
 	"fmt"
 	"io"
-	"io/ioutil"
+	"os"
 	"runtime"
 	"strconv"
 	"time"
@@ -575,7 +575,7 @@ func (b *profileBuilder) emitLocation() uint64 {
 // It saves the address ranges of the mappings in b.mem for use
 // when emitting locations.
 func (b *profileBuilder) readMapping() {
-	data, _ := ioutil.ReadFile("/proc/self/maps")
+	data, _ := os.ReadFile("/proc/self/maps")
 	parseProcSelfMaps(data, b.addMapping)
 	if len(b.mem) == 0 { // pprof expects a map entry, so fake one.
 		b.addMappingEntry(0, 0, 0, "", "", true)
diff --git a/src/runtime/pprof/proto_test.go b/src/runtime/pprof/proto_test.go
index 3043d5353f..5eb1aab140 100644
--- a/src/runtime/pprof/proto_test.go
+++ b/src/runtime/pprof/proto_test.go
@@ -10,7 +10,6 @@ import (
 	"fmt"
 	"internal/profile"
 	"internal/testenv"
-	"io/ioutil"
 	"os"
 	"os/exec"
 	"reflect"
@@ -78,7 +77,7 @@ func testPCs(t *testing.T) (addr1, addr2 uint64, map1, map2 *profile.Mapping) {
 	switch runtime.GOOS {
 	case "linux", "android", "netbsd":
 		// Figure out two addresses from /proc/self/maps.
-		mmap, err := ioutil.ReadFile("/proc/self/maps")
+		mmap, err := os.ReadFile("/proc/self/maps")
 		if err != nil {
 			t.Fatal(err)
 		}