1 files changed, 84 insertions, 0 deletions
diff --git a/src/os/dir_darwin.go b/src/os/dir_darwin.go
new file mode 100644
index 0000000000..2f9ba78d68
--- /dev/null
+++ b/src/os/dir_darwin.go
@@ -0,0 +1,84 @@
+// Copyright 2009 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.
+
+package os
+
+import (
+	"io"
+	"runtime"
+	"syscall"
+	"unsafe"
+)
+
+// Auxiliary information if the File describes a directory
+type dirInfo struct {
+	dir uintptr // Pointer to DIR structure from dirent.h
+}
+
+func (d *dirInfo) close() {
+	if d.dir == 0 {
+		return
+	}
+	closedir(d.dir)
+	d.dir = 0
+}
+
+func (f *File) readdirnames(n int) (names []string, err error) {
+	if f.dirinfo == nil {
+		dir, call, errno := f.pfd.OpenDir()
+		if errno != nil {
+			return nil, wrapSyscallError(call, errno)
+		}
+		f.dirinfo = &dirInfo{
+			dir: dir,
+		}
+	}
+	d := f.dirinfo
+
+	size := n
+	if size <= 0 {
+		size = 100
+		n = -1
+	}
+
+	names = make([]string, 0, size)
+	var dirent syscall.Dirent
+	var entptr *syscall.Dirent
+	for len(names) < size || n == -1 {
+		if res := readdir_r(d.dir, &dirent, &entptr); res != 0 {
+			return names, wrapSyscallError("readdir", syscall.Errno(res))
+		}
+		if entptr == nil { // EOF
+			break
+		}
+		if dirent.Ino == 0 {
+			continue
+		}
+		name := (*[len(syscall.Dirent{}.Name)]byte)(unsafe.Pointer(&dirent.Name))[:]
+		for i, c := range name {
+			if c == 0 {
+				name = name[:i]
+				break
+			}
+		}
+		// Check for useless names before allocating a string.
+		if string(name) == "." || string(name) == ".." {
+			continue
+		}
+		names = append(names, string(name))
+		runtime.KeepAlive(f)
+	}
+	if n >= 0 && len(names) == 0 {
+		return names, io.EOF
+	}
+	return names, nil
+}
+
+// Implemented in syscall/syscall_darwin.go.
+
+//go:linkname closedir syscall.closedir
+func closedir(dir uintptr) (err error)
+
+//go:linkname readdir_r syscall.readdir_r
+func readdir_r(dir uintptr, entry *syscall.Dirent, result **syscall.Dirent) (res int)