From 66cac9e1e4877ac7e66f888b0599a7a4a5787b76 Mon Sep 17 00:00:00 2001
From: Johan Brandhorst-Satzkorn <johan.brandhorst@gmail.com>
Date: Sat, 25 Mar 2023 10:18:26 -0700
Subject: [PATCH] os: add wasip1 support

For #58141

Co-authored-by: Richard Musiol <neelance@gmail.com>
Co-authored-by: Achille Roussel <achille.roussel@gmail.com>
Co-authored-by: Julien Fabre <ju.pryz@gmail.com>
Co-authored-by: Evan Phoenix <evan@phx.io>
Change-Id: I52e3e161f81dcbe8605570e47d732992979c4d34
Reviewed-on: https://go-review.googlesource.com/c/go/+/479623
Run-TryBot: Johan Brandhorst-Satzkorn <johan.brandhorst@gmail.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@google.com>
Auto-Submit: Ian Lance Taylor <iant@google.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
Run-TryBot: Ian Lance Taylor <iant@google.com>
---
 src/os/dir_unix.go                         |  2 +-
 src/os/dirent_wasip1.go                    | 52 ++++++++++++++++++++++
 src/os/error_posix.go                      |  2 +-
 src/os/error_unix_test.go                  |  2 +-
 src/os/exec/internal/fdtest/exists_js.go   | 18 --------
 src/os/exec/internal/fdtest/exists_unix.go |  2 +-
 src/os/exec/{lp_js.go => lp_wasm.go}       |  2 +-
 src/os/exec_posix.go                       |  2 +-
 src/os/exec_unix.go                        |  2 +-
 src/os/executable_procfs.go                |  2 +-
 src/os/executable_wasm.go                  | 16 +++++++
 src/os/export_unix_test.go                 |  2 +-
 src/os/file_open_unix.go                   | 17 +++++++
 src/os/file_open_wasip1.go                 | 31 +++++++++++++
 src/os/file_posix.go                       |  2 +-
 src/os/file_unix.go                        | 11 +++--
 src/os/os_test.go                          | 39 ++++++++++++----
 src/os/os_unix_test.go                     | 15 ++++++-
 src/os/path_unix.go                        |  2 +-
 src/os/pipe_test.go                        |  2 +-
 src/os/pipe_unix.go                        |  2 +-
 src/os/pipe_wasm.go                        | 16 +++++++
 src/os/rawconn_test.go                     |  2 +-
 src/os/read_test.go                        |  4 ++
 src/os/removeall_test.go                   | 11 +++--
 src/os/signal/signal_unix.go               |  2 +-
 src/os/stat_unix.go                        |  2 +-
 src/os/stat_wasip1.go                      | 40 +++++++++++++++++
 src/os/sticky_bsd.go                       |  2 +-
 src/os/sticky_notbsd.go                    |  2 +-
 src/os/sys_bsd.go                          |  2 +-
 src/os/sys_wasip1.go                       | 11 +++++
 src/os/timeout_test.go                     |  2 +-
 src/os/user/listgroups_stub.go             |  2 +-
 src/os/user/listgroups_unix.go             |  2 +-
 src/os/user/listgroups_unix_test.go        |  2 +-
 src/os/user/lookup_unix.go                 |  2 +-
 src/os/wait_unimp.go                       |  4 +-
 38 files changed, 271 insertions(+), 62 deletions(-)
 create mode 100644 src/os/dirent_wasip1.go
 delete mode 100644 src/os/exec/internal/fdtest/exists_js.go
 rename src/os/exec/{lp_js.go => lp_wasm.go} (97%)
 create mode 100644 src/os/executable_wasm.go
 create mode 100644 src/os/file_open_unix.go
 create mode 100644 src/os/file_open_wasip1.go
 create mode 100644 src/os/pipe_wasm.go
 create mode 100644 src/os/stat_wasip1.go
 create mode 100644 src/os/sys_wasip1.go

diff --git a/src/os/dir_unix.go b/src/os/dir_unix.go
index 9b3871a3e8..004b9fbb2b 100644
--- a/src/os/dir_unix.go
+++ b/src/os/dir_unix.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-//go:build aix || dragonfly || freebsd || (js && wasm) || linux || netbsd || openbsd || solaris
+//go:build aix || dragonfly || freebsd || (js && wasm) || wasip1 || linux || netbsd || openbsd || solaris
 
 package os
 
diff --git a/src/os/dirent_wasip1.go b/src/os/dirent_wasip1.go
new file mode 100644
index 0000000000..d3f10b2aeb
--- /dev/null
+++ b/src/os/dirent_wasip1.go
@@ -0,0 +1,52 @@
+// Copyright 2023 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build wasip1
+
+package os
+
+import (
+	"syscall"
+	"unsafe"
+)
+
+// https://github.com/WebAssembly/WASI/blob/main/legacy/preview1/docs.md#-dirent-record
+const sizeOfDirent = 24
+
+func direntIno(buf []byte) (uint64, bool) {
+	return readInt(buf, unsafe.Offsetof(syscall.Dirent{}.Ino), unsafe.Sizeof(syscall.Dirent{}.Ino))
+}
+
+func direntReclen(buf []byte) (uint64, bool) {
+	namelen, ok := direntNamlen(buf)
+	return sizeOfDirent + namelen, ok
+}
+
+func direntNamlen(buf []byte) (uint64, bool) {
+	return readInt(buf, unsafe.Offsetof(syscall.Dirent{}.Namlen), unsafe.Sizeof(syscall.Dirent{}.Namlen))
+}
+
+func direntType(buf []byte) FileMode {
+	off := unsafe.Offsetof(syscall.Dirent{}.Type)
+	if off >= uintptr(len(buf)) {
+		return ^FileMode(0) // unknown
+	}
+	switch syscall.Filetype(buf[off]) {
+	case syscall.FILETYPE_BLOCK_DEVICE:
+		return ModeDevice
+	case syscall.FILETYPE_CHARACTER_DEVICE:
+		return ModeDevice | ModeCharDevice
+	case syscall.FILETYPE_DIRECTORY:
+		return ModeDir
+	case syscall.FILETYPE_REGULAR_FILE:
+		return 0
+	case syscall.FILETYPE_SOCKET_DGRAM:
+		return ModeSocket
+	case syscall.FILETYPE_SOCKET_STREAM:
+		return ModeSocket
+	case syscall.FILETYPE_SYMBOLIC_LINK:
+		return ModeSymlink
+	}
+	return ^FileMode(0) // unknown
+}
diff --git a/src/os/error_posix.go b/src/os/error_posix.go
index f709d6e344..b159c036c1 100644
--- a/src/os/error_posix.go
+++ b/src/os/error_posix.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-//go:build unix || (js && wasm) || windows
+//go:build unix || (js && wasm) || wasip1 || windows
 
 package os
 
diff --git a/src/os/error_unix_test.go b/src/os/error_unix_test.go
index 1c694fe5f1..07a3286cd6 100644
--- a/src/os/error_unix_test.go
+++ b/src/os/error_unix_test.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-//go:build unix || (js && wasm)
+//go:build unix || (js && wasm) || wasip1
 
 package os_test
 
diff --git a/src/os/exec/internal/fdtest/exists_js.go b/src/os/exec/internal/fdtest/exists_js.go
deleted file mode 100644
index a7ce33c74f..0000000000
--- a/src/os/exec/internal/fdtest/exists_js.go
+++ /dev/null
@@ -1,18 +0,0 @@
-// Copyright 2021 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-//go:build js
-
-package fdtest
-
-import (
-	"syscall"
-)
-
-// Exists returns true if fd is a valid file descriptor.
-func Exists(fd uintptr) bool {
-	var s syscall.Stat_t
-	err := syscall.Fstat(int(fd), &s)
-	return err != syscall.EBADF
-}
diff --git a/src/os/exec/internal/fdtest/exists_unix.go b/src/os/exec/internal/fdtest/exists_unix.go
index 265cb69822..472a802d7b 100644
--- a/src/os/exec/internal/fdtest/exists_unix.go
+++ b/src/os/exec/internal/fdtest/exists_unix.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-//go:build unix
+//go:build unix || wasm
 
 // Package fdtest provides test helpers for working with file descriptors across exec.
 package fdtest
diff --git a/src/os/exec/lp_js.go b/src/os/exec/lp_wasm.go
similarity index 97%
rename from src/os/exec/lp_js.go
rename to src/os/exec/lp_wasm.go
index 54ddc4d5b4..f2c8e9c5de 100644
--- a/src/os/exec/lp_js.go
+++ b/src/os/exec/lp_wasm.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-//go:build js && wasm
+//go:build wasm
 
 package exec
 
diff --git a/src/os/exec_posix.go b/src/os/exec_posix.go
index e1e7d53a27..a512d5199a 100644
--- a/src/os/exec_posix.go
+++ b/src/os/exec_posix.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-//go:build unix || (js && wasm) || windows
+//go:build unix || (js && wasm) || wasip1 || windows
 
 package os
 
diff --git a/src/os/exec_unix.go b/src/os/exec_unix.go
index 90a4a61222..f9063b4db4 100644
--- a/src/os/exec_unix.go
+++ b/src/os/exec_unix.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-//go:build unix || (js && wasm)
+//go:build unix || (js && wasm) || wasip1
 
 package os
 
diff --git a/src/os/executable_procfs.go b/src/os/executable_procfs.go
index 18348eab91..94e674e364 100644
--- a/src/os/executable_procfs.go
+++ b/src/os/executable_procfs.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-//go:build linux || netbsd || (js && wasm)
+//go:build linux || netbsd
 
 package os
 
diff --git a/src/os/executable_wasm.go b/src/os/executable_wasm.go
new file mode 100644
index 0000000000..a88360c16f
--- /dev/null
+++ b/src/os/executable_wasm.go
@@ -0,0 +1,16 @@
+// Copyright 2023 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build wasm
+
+package os
+
+import (
+	"errors"
+	"runtime"
+)
+
+func executable() (string, error) {
+	return "", errors.New("Executable not implemented for " + runtime.GOOS)
+}
diff --git a/src/os/export_unix_test.go b/src/os/export_unix_test.go
index 49c8dae036..b8dcca0f8f 100644
--- a/src/os/export_unix_test.go
+++ b/src/os/export_unix_test.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-//go:build unix || (js && wasm)
+//go:build unix || (js && wasm) || wasip1
 
 package os
 
diff --git a/src/os/file_open_unix.go b/src/os/file_open_unix.go
new file mode 100644
index 0000000000..a3336eac81
--- /dev/null
+++ b/src/os/file_open_unix.go
@@ -0,0 +1,17 @@
+// Copyright 2023 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build unix || (js && wasm)
+
+package os
+
+import (
+	"internal/poll"
+	"syscall"
+)
+
+func open(path string, flag int, perm uint32) (int, poll.SysFile, error) {
+	fd, err := syscall.Open(path, flag, perm)
+	return fd, poll.SysFile{}, err
+}
diff --git a/src/os/file_open_wasip1.go b/src/os/file_open_wasip1.go
new file mode 100644
index 0000000000..f3ef165e6d
--- /dev/null
+++ b/src/os/file_open_wasip1.go
@@ -0,0 +1,31 @@
+// Copyright 2023 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build wasip1
+
+package os
+
+import (
+	"internal/poll"
+	"syscall"
+)
+
+func open(filePath string, flag int, perm uint32) (int, poll.SysFile, error) {
+	if filePath == "" {
+		return -1, poll.SysFile{}, syscall.EINVAL
+	}
+	absPath := filePath
+	// os.(*File).Chdir is emulated by setting the working directory to the
+	// absolute path that this file was opened at, which is why we have to
+	// resolve and capture it here.
+	if filePath[0] != '/' {
+		wd, err := syscall.Getwd()
+		if err != nil {
+			return -1, poll.SysFile{}, err
+		}
+		absPath = joinPath(wd, filePath)
+	}
+	fd, err := syscall.Open(absPath, flag, perm)
+	return fd, poll.SysFile{Path: absPath}, err
+}
diff --git a/src/os/file_posix.go b/src/os/file_posix.go
index c6d18ffeb6..4e0f7c1d80 100644
--- a/src/os/file_posix.go
+++ b/src/os/file_posix.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-//go:build unix || (js && wasm) || windows
+//go:build unix || (js && wasm) || wasip1 || windows
 
 package os
 
diff --git a/src/os/file_unix.go b/src/os/file_unix.go
index 6a884a29a8..4962e9077d 100644
--- a/src/os/file_unix.go
+++ b/src/os/file_unix.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-//go:build unix || (js && wasm)
+//go:build unix || (js && wasm) || wasip1
 
 package os
 
@@ -231,9 +231,10 @@ func openFileNolog(name string, flag int, perm FileMode) (*File, error) {
 	}
 
 	var r int
+	var s poll.SysFile
 	for {
 		var e error
-		r, e = syscall.Open(name, flag|syscall.O_CLOEXEC, syscallMode(perm))
+		r, s, e = open(name, flag|syscall.O_CLOEXEC, syscallMode(perm))
 		if e == nil {
 			break
 		}
@@ -257,7 +258,9 @@ func openFileNolog(name string, flag int, perm FileMode) (*File, error) {
 		syscall.CloseOnExec(r)
 	}
 
-	return newFile(uintptr(r), name, kindOpenFile), nil
+	f := newFile(uintptr(r), name, kindOpenFile)
+	f.pfd.SysFile = s
+	return f, nil
 }
 
 func (file *file) close() error {
@@ -399,7 +402,7 @@ func Readlink(name string) (string, error) {
 			}
 		}
 		// buffer too small
-		if runtime.GOOS == "aix" && e == syscall.ERANGE {
+		if (runtime.GOOS == "aix" || runtime.GOOS == "wasip1") && e == syscall.ERANGE {
 			continue
 		}
 		if e != nil {
diff --git a/src/os/os_test.go b/src/os/os_test.go
index 01211dde3e..d049357b1a 100644
--- a/src/os/os_test.go
+++ b/src/os/os_test.go
@@ -104,6 +104,18 @@ var sysdir = func() *sysDir {
 				"local",
 			},
 		}
+	case "wasip1":
+		// wasmtime has issues resolving symbolic links that are often present
+		// in directories like /etc/group below (e.g. private/etc/group on OSX).
+		// For this reason we use files in the Go source tree instead.
+		return &sysDir{
+			runtime.GOROOT(),
+			[]string{
+				"go.env",
+				"LICENSE",
+				"CONTRIBUTING.md",
+			},
+		}
 	}
 	return &sysDir{
 		"/etc",
@@ -1253,6 +1265,10 @@ func checkMode(t *testing.T, path string, mode FileMode) {
 }
 
 func TestChmod(t *testing.T) {
+	// Chmod is not supported on wasip1.
+	if runtime.GOOS == "wasip1" {
+		t.Skip("Chmod is not supported on " + runtime.GOOS)
+	}
 	t.Parallel()
 
 	f := newFile("TestChmod", t)
@@ -1661,7 +1677,7 @@ func TestSeek(t *testing.T) {
 
 func TestSeekError(t *testing.T) {
 	switch runtime.GOOS {
-	case "js", "plan9":
+	case "js", "plan9", "wasip1":
 		t.Skipf("skipping test on %v", runtime.GOOS)
 	}
 	t.Parallel()
@@ -2172,6 +2188,9 @@ func TestLargeWriteToConsole(t *testing.T) {
 }
 
 func TestStatDirModeExec(t *testing.T) {
+	if runtime.GOOS == "wasip1" {
+		t.Skip("Chmod is not supported on " + runtime.GOOS)
+	}
 	t.Parallel()
 
 	const mode = 0111
@@ -2365,9 +2384,11 @@ func TestLongPath(t *testing.T) {
 					if dir.Size() != filesize || filesize != wantSize {
 						t.Errorf("Size(%q) is %d, len(ReadFile()) is %d, want %d", path, dir.Size(), filesize, wantSize)
 					}
-					err = Chmod(path, dir.Mode())
-					if err != nil {
-						t.Fatalf("Chmod(%q) failed: %v", path, err)
+					if runtime.GOOS != "wasip1" { // Chmod is not supported on wasip1
+						err = Chmod(path, dir.Mode())
+						if err != nil {
+							t.Fatalf("Chmod(%q) failed: %v", path, err)
+						}
 					}
 				}
 				if err := Truncate(sizedTempDir+"/bar.txt", 0); err != nil {
@@ -2561,6 +2582,8 @@ func TestPipeThreads(t *testing.T) {
 		t.Skip("skipping on Plan 9; does not support runtime poller")
 	case "js":
 		t.Skip("skipping on js; no support for os.Pipe")
+	case "wasip1":
+		t.Skip("skipping on wasip1; no support for os.Pipe")
 	}
 
 	threads := 100
@@ -2963,8 +2986,8 @@ func TestWriteStringAlloc(t *testing.T) {
 // Test that it's OK to have parallel I/O and Close on a pipe.
 func TestPipeIOCloseRace(t *testing.T) {
 	// Skip on wasm, which doesn't have pipes.
-	if runtime.GOOS == "js" {
-		t.Skip("skipping on js: no pipes")
+	if runtime.GOOS == "js" || runtime.GOOS == "wasip1" {
+		t.Skipf("skipping on %s: no pipes", runtime.GOOS)
 	}
 	t.Parallel()
 
@@ -3041,8 +3064,8 @@ func TestPipeIOCloseRace(t *testing.T) {
 // Test that it's OK to call Close concurrently on a pipe.
 func TestPipeCloseRace(t *testing.T) {
 	// Skip on wasm, which doesn't have pipes.
-	if runtime.GOOS == "js" {
-		t.Skip("skipping on js: no pipes")
+	if runtime.GOOS == "js" || runtime.GOOS == "wasip1" {
+		t.Skipf("skipping on %s: no pipes", runtime.GOOS)
 	}
 	t.Parallel()
 
diff --git a/src/os/os_unix_test.go b/src/os/os_unix_test.go
index 9a0ba70400..73940f982f 100644
--- a/src/os/os_unix_test.go
+++ b/src/os/os_unix_test.go
@@ -2,11 +2,12 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-//go:build unix || (js && wasm)
+//go:build unix || (js && wasm) || wasip1
 
 package os_test
 
 import (
+	"internal/testenv"
 	"io"
 	. "os"
 	"path/filepath"
@@ -39,6 +40,9 @@ func checkUidGid(t *testing.T, path string, uid, gid int) {
 }
 
 func TestChown(t *testing.T) {
+	if runtime.GOOS == "wasip1" {
+		t.Skip("file ownership not supported on " + runtime.GOOS)
+	}
 	t.Parallel()
 
 	// Use TempDir() to make sure we're on a local file system,
@@ -84,6 +88,9 @@ func TestChown(t *testing.T) {
 }
 
 func TestFileChown(t *testing.T) {
+	if runtime.GOOS == "wasip1" {
+		t.Skip("file ownership not supported on " + runtime.GOOS)
+	}
 	t.Parallel()
 
 	// Use TempDir() to make sure we're on a local file system,
@@ -129,6 +136,7 @@ func TestFileChown(t *testing.T) {
 }
 
 func TestLchown(t *testing.T) {
+	testenv.MustHaveSymlink(t)
 	t.Parallel()
 
 	// Use TempDir() to make sure we're on a local file system,
@@ -219,6 +227,9 @@ func TestReaddirRemoveRace(t *testing.T) {
 
 // Issue 23120: respect umask when doing Mkdir with the sticky bit
 func TestMkdirStickyUmask(t *testing.T) {
+	if runtime.GOOS == "wasip1" {
+		t.Skip("file permissions not supported on " + runtime.GOOS)
+	}
 	t.Parallel()
 
 	const umask = 0077
@@ -241,7 +252,7 @@ func TestMkdirStickyUmask(t *testing.T) {
 
 // See also issues: 22939, 24331
 func newFileTest(t *testing.T, blocking bool) {
-	if runtime.GOOS == "js" {
+	if runtime.GOOS == "js" || runtime.GOOS == "wasip1" {
 		t.Skipf("syscall.Pipe is not available on %s.", runtime.GOOS)
 	}
 
diff --git a/src/os/path_unix.go b/src/os/path_unix.go
index 3c6310a4df..c975cdb11e 100644
--- a/src/os/path_unix.go
+++ b/src/os/path_unix.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-//go:build unix || (js && wasm)
+//go:build unix || (js && wasm) || wasip1
 
 package os
 
diff --git a/src/os/pipe_test.go b/src/os/pipe_test.go
index d0a4c65de2..6f01d30e24 100644
--- a/src/os/pipe_test.go
+++ b/src/os/pipe_test.go
@@ -4,7 +4,7 @@
 
 // Test broken pipes on Unix systems.
 //
-//go:build !plan9 && !js
+//go:build !plan9 && !js && !wasip1
 
 package os_test
 
diff --git a/src/os/pipe_unix.go b/src/os/pipe_unix.go
index 710f77670e..a12412e0ca 100644
--- a/src/os/pipe_unix.go
+++ b/src/os/pipe_unix.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-//go:build aix || darwin || (js && wasm)
+//go:build aix || darwin
 
 package os
 
diff --git a/src/os/pipe_wasm.go b/src/os/pipe_wasm.go
new file mode 100644
index 0000000000..87a29b1f71
--- /dev/null
+++ b/src/os/pipe_wasm.go
@@ -0,0 +1,16 @@
+// Copyright 2023 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build wasm
+
+package os
+
+import "syscall"
+
+// Pipe returns a connected pair of Files; reads from r return bytes written to w.
+// It returns the files and an error, if any.
+func Pipe() (r *File, w *File, err error) {
+	// Neither GOOS=js nor GOOS=wasip1 have pipes.
+	return nil, nil, NewSyscallError("pipe", syscall.ENOSYS)
+}
diff --git a/src/os/rawconn_test.go b/src/os/rawconn_test.go
index 62b99f8784..8aae7ae684 100644
--- a/src/os/rawconn_test.go
+++ b/src/os/rawconn_test.go
@@ -4,7 +4,7 @@
 
 // Test use of raw connections.
 //
-//go:build !plan9 && !js
+//go:build !plan9 && !js && !wasip1
 
 package os_test
 
diff --git a/src/os/read_test.go b/src/os/read_test.go
index 5511dad948..18f7d54734 100644
--- a/src/os/read_test.go
+++ b/src/os/read_test.go
@@ -8,6 +8,7 @@ import (
 	"bytes"
 	. "os"
 	"path/filepath"
+	"runtime"
 	"testing"
 )
 
@@ -71,6 +72,9 @@ func TestReadOnlyWriteFile(t *testing.T) {
 	if Getuid() == 0 {
 		t.Skipf("Root can write to read-only files anyway, so skip the read-only test.")
 	}
+	if runtime.GOOS == "wasip1" {
+		t.Skip("no support for file permissions on " + runtime.GOOS)
+	}
 	t.Parallel()
 
 	// We don't want to use CreateTemp directly, since that opens a file for us as 0600.
diff --git a/src/os/removeall_test.go b/src/os/removeall_test.go
index 32c0cbaefa..2f7938bb5c 100644
--- a/src/os/removeall_test.go
+++ b/src/os/removeall_test.go
@@ -79,8 +79,8 @@ func TestRemoveAll(t *testing.T) {
 		t.Fatalf("Lstat %q succeeded after RemoveAll (third)", path)
 	}
 
-	// Chmod is not supported under Windows and test fails as root.
-	if runtime.GOOS != "windows" && Getuid() != 0 {
+	// Chmod is not supported under Windows or wasip1 and test fails as root.
+	if runtime.GOOS != "windows" && runtime.GOOS != "wasip1" && Getuid() != 0 {
 		// Make directory with file and subdirectory and trigger error.
 		if err = MkdirAll(dpath, 0777); err != nil {
 			t.Fatalf("MkdirAll %q: %s", dpath, err)
@@ -273,7 +273,7 @@ func TestRemoveReadOnlyDir(t *testing.T) {
 // Issue #29983.
 func TestRemoveAllButReadOnlyAndPathError(t *testing.T) {
 	switch runtime.GOOS {
-	case "js", "windows":
+	case "js", "wasip1", "windows":
 		t.Skipf("skipping test on %s", runtime.GOOS)
 	}
 
@@ -421,9 +421,12 @@ func TestRemoveAllWithMoreErrorThanReqSize(t *testing.T) {
 		return
 	}
 	if err == nil {
-		if runtime.GOOS == "windows" {
+		if runtime.GOOS == "windows" || runtime.GOOS == "wasip1" {
 			// Marking a directory as read-only in Windows does not prevent the RemoveAll
 			// from creating or removing files within it.
+			//
+			// For wasip1, there is no support for file permissions so we cannot prevent
+			// RemoveAll from removing the files.
 			return
 		}
 		t.Fatal("RemoveAll(<read-only directory>) = nil; want error")
diff --git a/src/os/signal/signal_unix.go b/src/os/signal/signal_unix.go
index 772175a922..21dfa41691 100644
--- a/src/os/signal/signal_unix.go
+++ b/src/os/signal/signal_unix.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-//go:build unix || (js && wasm) || windows
+//go:build unix || (js && wasm) || wasip1 || windows
 
 package signal
 
diff --git a/src/os/stat_unix.go b/src/os/stat_unix.go
index 437afc02b4..431df33fae 100644
--- a/src/os/stat_unix.go
+++ b/src/os/stat_unix.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-//go:build unix || (js && wasm)
+//go:build unix || (js && wasm) || wasip1
 
 package os
 
diff --git a/src/os/stat_wasip1.go b/src/os/stat_wasip1.go
new file mode 100644
index 0000000000..a4f0a20430
--- /dev/null
+++ b/src/os/stat_wasip1.go
@@ -0,0 +1,40 @@
+// Copyright 2023 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build wasip1
+
+package os
+
+import (
+	"syscall"
+	"time"
+)
+
+func fillFileStatFromSys(fs *fileStat, name string) {
+	fs.name = basename(name)
+	fs.size = int64(fs.sys.Size)
+	fs.mode = FileMode(fs.sys.Mode)
+	fs.modTime = time.Unix(0, int64(fs.sys.Mtime))
+
+	switch fs.sys.Filetype {
+	case syscall.FILETYPE_BLOCK_DEVICE:
+		fs.mode |= ModeDevice
+	case syscall.FILETYPE_CHARACTER_DEVICE:
+		fs.mode |= ModeDevice | ModeCharDevice
+	case syscall.FILETYPE_DIRECTORY:
+		fs.mode |= ModeDir
+	case syscall.FILETYPE_SOCKET_DGRAM:
+		fs.mode |= ModeSocket
+	case syscall.FILETYPE_SOCKET_STREAM:
+		fs.mode |= ModeSocket
+	case syscall.FILETYPE_SYMBOLIC_LINK:
+		fs.mode |= ModeSymlink
+	}
+}
+
+// For testing.
+func atime(fi FileInfo) time.Time {
+	st := fi.Sys().(*syscall.Stat_t)
+	return time.Unix(0, int64(st.Atime))
+}
diff --git a/src/os/sticky_bsd.go b/src/os/sticky_bsd.go
index e71daf7c74..a6d9339505 100644
--- a/src/os/sticky_bsd.go
+++ b/src/os/sticky_bsd.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-//go:build aix || darwin || dragonfly || freebsd || (js && wasm) || netbsd || openbsd || solaris
+//go:build aix || darwin || dragonfly || freebsd || (js && wasm) || netbsd || openbsd || solaris || wasip1
 
 package os
 
diff --git a/src/os/sticky_notbsd.go b/src/os/sticky_notbsd.go
index 9a87fbde92..1d289b0fe3 100644
--- a/src/os/sticky_notbsd.go
+++ b/src/os/sticky_notbsd.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-//go:build !aix && !darwin && !dragonfly && !freebsd && (!js || !wasm) && !netbsd && !openbsd && !solaris
+//go:build !aix && !darwin && !dragonfly && !freebsd && !js && !netbsd && !openbsd && !solaris && !wasip1
 
 package os
 
diff --git a/src/os/sys_bsd.go b/src/os/sys_bsd.go
index e272c24571..63120fb9b4 100644
--- a/src/os/sys_bsd.go
+++ b/src/os/sys_bsd.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-//go:build darwin || dragonfly || freebsd || (js && wasm) || netbsd || openbsd
+//go:build darwin || dragonfly || freebsd || (js && wasm) || netbsd || openbsd || wasip1
 
 package os
 
diff --git a/src/os/sys_wasip1.go b/src/os/sys_wasip1.go
new file mode 100644
index 0000000000..5a29aa53cb
--- /dev/null
+++ b/src/os/sys_wasip1.go
@@ -0,0 +1,11 @@
+// Copyright 2023 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build wasip1
+
+package os
+
+// supportsCloseOnExec reports whether the platform supports the
+// O_CLOEXEC flag.
+const supportsCloseOnExec = false
diff --git a/src/os/timeout_test.go b/src/os/timeout_test.go
index 110b914e13..3cf06d5647 100644
--- a/src/os/timeout_test.go
+++ b/src/os/timeout_test.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-//go:build !js && !plan9 && !windows
+//go:build !js && !plan9 && !wasip1 && !windows
 
 package os_test
 
diff --git a/src/os/user/listgroups_stub.go b/src/os/user/listgroups_stub.go
index 4cf808b65d..aa7df93eed 100644
--- a/src/os/user/listgroups_stub.go
+++ b/src/os/user/listgroups_stub.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-//go:build android || (js && !wasm)
+//go:build android
 
 package user
 
diff --git a/src/os/user/listgroups_unix.go b/src/os/user/listgroups_unix.go
index ef366fa280..67bd8a776e 100644
--- a/src/os/user/listgroups_unix.go
+++ b/src/os/user/listgroups_unix.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-//go:build ((darwin || dragonfly || freebsd || (js && wasm) || (!android && linux) || netbsd || openbsd || solaris) && ((!cgo && !darwin) || osusergo)) || aix || illumos
+//go:build ((darwin || dragonfly || freebsd || (js && wasm) || wasip1 || (!android && linux) || netbsd || openbsd || solaris) && ((!cgo && !darwin) || osusergo)) || aix || illumos
 
 package user
 
diff --git a/src/os/user/listgroups_unix_test.go b/src/os/user/listgroups_unix_test.go
index 4fa8b1f29b..ae50319ec8 100644
--- a/src/os/user/listgroups_unix_test.go
+++ b/src/os/user/listgroups_unix_test.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-//go:build ((darwin || dragonfly || freebsd || (js && wasm) || (!android && linux) || netbsd || openbsd || solaris) && ((!cgo && !darwin) || osusergo)) || aix || illumos
+//go:build ((darwin || dragonfly || freebsd || (js && wasm) || wasip1 || (!android && linux) || netbsd || openbsd || solaris) && ((!cgo && !darwin) || osusergo)) || aix || illumos
 
 package user
 
diff --git a/src/os/user/lookup_unix.go b/src/os/user/lookup_unix.go
index 608d9b2140..a4308269e0 100644
--- a/src/os/user/lookup_unix.go
+++ b/src/os/user/lookup_unix.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-//go:build ((unix && !android) || (js && wasm)) && ((!cgo && !darwin) || osusergo)
+//go:build ((unix && !android) || (js && wasm) || wasip1) && ((!cgo && !darwin) || osusergo)
 
 package user
 
diff --git a/src/os/wait_unimp.go b/src/os/wait_unimp.go
index bc93e44cf9..d4aac372fb 100644
--- a/src/os/wait_unimp.go
+++ b/src/os/wait_unimp.go
@@ -2,11 +2,11 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// aix, darwin, js/wasm, openbsd and solaris don't implement
+// aix, darwin, js/wasm, openbsd, solaris and wasip1/wasm don't implement
 // waitid/wait6. netbsd implements wait6, but that is causing test
 // failures, see issue #48789.
 
-//go:build aix || darwin || (js && wasm) || openbsd || solaris
+//go:build aix || darwin || (js && wasm) || openbsd || solaris || wasip1
 
 package os
 
-- 
2.48.1