1 files changed, 240 insertions, 0 deletions
diff --git a/src/pkg/os/file_plan9.go b/src/pkg/os/file_plan9.go
new file mode 100644
index 000000000..c8d0efba4
--- /dev/null
+++ b/src/pkg/os/file_plan9.go
@@ -0,0 +1,240 @@
+// 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 (
+	"runtime"
+	"syscall"
+)
+
+// Auxiliary information if the File describes a directory
+type dirInfo struct {
+	buf  [syscall.STATMAX]byte // buffer for directory I/O
+	nbuf int                   // length of buf; return value from Read
+	bufp int                   // location of next record in buf.
+}
+
+func epipecheck(file *File, e syscall.Error) {
+}
+
+
+// DevNull is the name of the operating system's ``null device.''
+// On Unix-like systems, it is "/dev/null"; on Windows, "NUL".
+const DevNull = "/dev/null"
+
+// OpenFile is the generalized open call; most users will use Open
+// or Create instead.  It opens the named file with specified flag
+// (O_RDONLY etc.) and perm, (0666 etc.) if applicable.  If successful,
+// methods on the returned File can be used for I/O.
+// It returns the File and an Error, if any.
+func OpenFile(name string, flag int, perm uint32) (file *File, err Error) {
+	var fd int
+	var e syscall.Error
+
+	syscall.ForkLock.RLock()
+	if flag&O_CREATE == O_CREATE {
+		fd, e = syscall.Create(name, flag & ^O_CREATE, perm)
+	} else {
+		fd, e = syscall.Open(name, flag)
+	}
+	syscall.ForkLock.RUnlock()
+
+	if e != nil {
+		return nil, &PathError{"open", name, e}
+	}
+
+	return NewFile(fd, name), nil
+}
+
+// Close closes the File, rendering it unusable for I/O.
+// It returns an Error, if any.
+func (file *File) Close() Error {
+	if file == nil || file.fd < 0 {
+		return Ebadfd
+	}
+	var err Error
+	syscall.ForkLock.RLock()
+	if e := syscall.Close(file.fd); e != nil {
+		err = &PathError{"close", file.name, e}
+	}
+	syscall.ForkLock.RUnlock()
+	file.fd = -1 // so it can't be closed again
+
+	// no need for a finalizer anymore
+	runtime.SetFinalizer(file, nil)
+	return err
+}
+
+// Stat returns the FileInfo structure describing file.
+// It returns the FileInfo and an error, if any.
+func (file *File) Stat() (fi *FileInfo, err Error) {
+	return dirstat(file)
+}
+
+// Truncate changes the size of the file.
+// It does not change the I/O offset.
+func (f *File) Truncate(size int64) Error {
+	var d Dir
+	d.Null()
+
+	d.Length = uint64(size)
+
+	if e := syscall.Fwstat(f.fd, pdir(nil, &d)); iserror(e) {
+		return &PathError{"truncate", f.name, e}
+	}
+	return nil
+}
+
+// Chmod changes the mode of the file to mode.
+func (f *File) Chmod(mode uint32) Error {
+	var d Dir
+	d.Null()
+
+	d.Mode = mode & 0777
+
+	if e := syscall.Fwstat(f.fd, pdir(nil, &d)); iserror(e) {
+		return &PathError{"chmod", f.name, e}
+	}
+	return nil
+}
+
+// Sync commits the current contents of the file to stable storage.
+// Typically, this means flushing the file system's in-memory copy
+// of recently written data to disk.
+func (f *File) Sync() (err Error) {
+	if f == nil {
+		return EINVAL
+	}
+
+	var d Dir
+	d.Null()
+
+	if e := syscall.Fwstat(f.fd, pdir(nil, &d)); iserror(e) {
+		return NewSyscallError("fsync", e)
+	}
+	return nil
+}
+
+// Truncate changes the size of the named file.
+// If the file is a symbolic link, it changes the size of the link's target.
+func Truncate(name string, size int64) Error {
+	var d Dir
+	d.Null()
+
+	d.Length = uint64(size)
+
+	if e := syscall.Wstat(name, pdir(nil, &d)); iserror(e) {
+		return &PathError{"truncate", name, e}
+	}
+	return nil
+}
+
+// Remove removes the named file or directory.
+func Remove(name string) Error {
+	if e := syscall.Remove(name); iserror(e) {
+		return &PathError{"remove", name, e}
+	}
+	return nil
+}
+
+// Rename renames a file.
+func Rename(oldname, newname string) Error {
+	var d Dir
+	d.Null()
+
+	d.Name = newname
+
+	if e := syscall.Wstat(oldname, pdir(nil, &d)); iserror(e) {
+		return &PathError{"rename", oldname, e}
+	}
+	return nil
+}
+
+// Chmod changes the mode of the named file to mode.
+func Chmod(name string, mode uint32) Error {
+	var d Dir
+	d.Null()
+
+	d.Mode = mode & 0777
+
+	if e := syscall.Wstat(name, pdir(nil, &d)); iserror(e) {
+		return &PathError{"chmod", name, e}
+	}
+	return nil
+}
+
+// ChownPlan9 changes the uid and gid strings of the named file.
+func ChownPlan9(name, uid, gid string) Error {
+	var d Dir
+	d.Null()
+
+	d.Uid = uid
+	d.Gid = gid
+
+	if e := syscall.Wstat(name, pdir(nil, &d)); iserror(e) {
+		return &PathError{"chown_plan9", name, e}
+	}
+	return nil
+}
+
+// Chtimes changes the access and modification times of the named
+// file, similar to the Unix utime() or utimes() functions.
+//
+// The argument times are in nanoseconds, although the underlying
+// filesystem may truncate or round the values to a more
+// coarse time unit.
+func Chtimes(name string, atimeNs int64, mtimeNs int64) Error {
+	var d Dir
+	d.Null()
+
+	d.Atime = uint32(atimeNs / 1e9)
+	d.Mtime = uint32(mtimeNs / 1e9)
+
+	if e := syscall.Wstat(name, pdir(nil, &d)); iserror(e) {
+		return &PathError{"chtimes", name, e}
+	}
+	return nil
+}
+
+func Pipe() (r *File, w *File, err Error) {
+	var p [2]int
+
+	syscall.ForkLock.RLock()
+	if e := syscall.Pipe(p[0:]); iserror(e) {
+		syscall.ForkLock.RUnlock()
+		return nil, nil, NewSyscallError("pipe", e)
+	}
+	syscall.ForkLock.RUnlock()
+
+	return NewFile(p[0], "|0"), NewFile(p[1], "|1"), nil
+}
+
+
+// not supported on Plan 9
+
+// Link creates a hard link.
+func Link(oldname, newname string) Error {
+	return EPLAN9
+}
+
+func Symlink(oldname, newname string) Error {
+	return EPLAN9
+}
+
+func Readlink(name string) (string, Error) {
+	return "", EPLAN9
+}
+
+func Chown(name string, uid, gid int) Error {
+	return EPLAN9
+}
+
+func Lchown(name string, uid, gid int) Error {
+	return EPLAN9
+}
+
+func (f *File) Chown(uid, gid int) Error {
+	return EPLAN9
+}