1 files changed, 110 insertions, 0 deletions
diff --git a/src/os/stat_plan9.go b/src/os/stat_plan9.go
new file mode 100644
index 000000000..25c9a8c14
--- /dev/null
+++ b/src/os/stat_plan9.go
@@ -0,0 +1,110 @@
+// Copyright 2011 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 (
+	"syscall"
+	"time"
+)
+
+func sameFile(fs1, fs2 *fileStat) bool {
+	a := fs1.sys.(*syscall.Dir)
+	b := fs2.sys.(*syscall.Dir)
+	return a.Qid.Path == b.Qid.Path && a.Type == b.Type && a.Dev == b.Dev
+}
+
+func fileInfoFromStat(d *syscall.Dir) FileInfo {
+	fs := &fileStat{
+		name:    d.Name,
+		size:    int64(d.Length),
+		modTime: time.Unix(int64(d.Mtime), 0),
+		sys:     d,
+	}
+	fs.mode = FileMode(d.Mode & 0777)
+	if d.Mode&syscall.DMDIR != 0 {
+		fs.mode |= ModeDir
+	}
+	if d.Mode&syscall.DMAPPEND != 0 {
+		fs.mode |= ModeAppend
+	}
+	if d.Mode&syscall.DMEXCL != 0 {
+		fs.mode |= ModeExclusive
+	}
+	if d.Mode&syscall.DMTMP != 0 {
+		fs.mode |= ModeTemporary
+	}
+	return fs
+}
+
+// arg is an open *File or a path string.
+func dirstat(arg interface{}) (*syscall.Dir, error) {
+	var name string
+
+	// This is big enough for most stat messages
+	// and rounded to a multiple of 128 bytes.
+	size := (syscall.STATFIXLEN + 16*4 + 128) &^ 128
+
+	for i := 0; i < 2; i++ {
+		buf := make([]byte, size)
+
+		var n int
+		var err error
+		switch a := arg.(type) {
+		case *File:
+			name = a.name
+			n, err = syscall.Fstat(a.fd, buf)
+		case string:
+			name = a
+			n, err = syscall.Stat(a, buf)
+		default:
+			panic("phase error in dirstat")
+		}
+		if err != nil {
+			return nil, &PathError{"stat", name, err}
+		}
+		if n < syscall.STATFIXLEN {
+			return nil, &PathError{"stat", name, syscall.ErrShortStat}
+		}
+
+		// Pull the real size out of the stat message.
+		size = int(uint16(buf[0]) | uint16(buf[1])<<8)
+
+		// If the stat message is larger than our buffer we will
+		// go around the loop and allocate one that is big enough.
+		if size > n {
+			continue
+		}
+
+		d, err := syscall.UnmarshalDir(buf[:n])
+		if err != nil {
+			return nil, &PathError{"stat", name, err}
+		}
+		return d, nil
+	}
+	return nil, &PathError{"stat", name, syscall.ErrBadStat}
+}
+
+// Stat returns a FileInfo describing the named file.
+// If there is an error, it will be of type *PathError.
+func Stat(name string) (fi FileInfo, err error) {
+	d, err := dirstat(name)
+	if err != nil {
+		return nil, err
+	}
+	return fileInfoFromStat(d), nil
+}
+
+// Lstat returns a FileInfo describing the named file.
+// If the file is a symbolic link, the returned FileInfo
+// describes the symbolic link.  Lstat makes no attempt to follow the link.
+// If there is an error, it will be of type *PathError.
+func Lstat(name string) (fi FileInfo, err error) {
+	return Stat(name)
+}
+
+// For testing.
+func atime(fi FileInfo) time.Time {
+	return time.Unix(int64(fi.Sys().(*syscall.Dir).Atime), 0)
+}