1 files changed, 331 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..1e94fb715
--- /dev/null
+++ b/src/pkg/os/file_plan9.go
@@ -0,0 +1,331 @@
+// 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"
+)
+
+// File represents an open file descriptor.
+type File struct {
+	fd      int
+	name    string
+	dirinfo *dirInfo // nil unless directory being read
+}
+
+// Fd returns the integer Unix file descriptor referencing the open file.
+func (file *File) Fd() int {
+	if file == nil {
+		return -1
+	}
+	return file.fd
+}
+
+// NewFile returns a new File with the given file descriptor and name.
+func NewFile(fd int, name string) *File {
+	if fd < 0 {
+		return nil
+	}
+	f := &File{fd: fd, name: name}
+	runtime.SetFinalizer(f, (*File).Close)
+	return f
+}
+
+// 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
+		e      syscall.Error
+		create bool
+		excl   bool
+		trunc  bool
+		append bool
+	)
+
+	if flag&O_CREATE == O_CREATE {
+		flag = flag & ^O_CREATE
+		create = true
+	}
+	if flag&O_EXCL == O_EXCL {
+		excl = true
+	}
+	if flag&O_TRUNC == O_TRUNC {
+		trunc = true
+	}
+	// O_APPEND is emulated on Plan 9
+	if flag&O_APPEND == O_APPEND {
+		flag = flag &^ O_APPEND
+		append = true
+	}
+
+	syscall.ForkLock.RLock()
+	if (create && trunc) || excl {
+		fd, e = syscall.Create(name, flag, perm)
+	} else {
+		fd, e = syscall.Open(name, flag)
+		if e != nil && create {
+			var e1 syscall.Error
+			fd, e1 = syscall.Create(name, flag, perm)
+			if e1 == nil {
+				e = nil
+			}
+		}
+	}
+	syscall.ForkLock.RUnlock()
+
+	if e != nil {
+		return nil, &PathError{"open", name, e}
+	}
+
+	if append {
+		if _, e = syscall.Seek(fd, 0, SEEK_END); e != nil {
+			return nil, &PathError{"seek", 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 (f *File) Stat() (fi *FileInfo, err Error) {
+	d, err := dirstat(f)
+	if iserror(err) {
+		return nil, err
+	}
+	return fileInfoFromStat(new(FileInfo), d), err
+}
+
+// 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
+	var mask = ^uint32(0777)
+
+	d.Null()
+	odir, e := dirstat(f)
+	if iserror(e) {
+		return &PathError{"chmod", f.name, e}
+	}
+
+	d.Mode = (odir.Mode & mask) | (mode &^ mask)
+	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
+}
+
+// read reads up to len(b) bytes from the File.
+// It returns the number of bytes read and an error, if any.
+func (f *File) read(b []byte) (n int, err syscall.Error) {
+	return syscall.Read(f.fd, b)
+}
+
+// pread reads len(b) bytes from the File starting at byte offset off.
+// It returns the number of bytes read and the error, if any.
+// EOF is signaled by a zero count with err set to nil.
+func (f *File) pread(b []byte, off int64) (n int, err syscall.Error) {
+	return syscall.Pread(f.fd, b, off)
+}
+
+// write writes len(b) bytes to the File.
+// It returns the number of bytes written and an error, if any.
+func (f *File) write(b []byte) (n int, err syscall.Error) {
+	return syscall.Write(f.fd, b)
+}
+
+// pwrite writes len(b) bytes to the File starting at byte offset off.
+// It returns the number of bytes written and an error, if any.
+func (f *File) pwrite(b []byte, off int64) (n int, err syscall.Error) {
+	return syscall.Pwrite(f.fd, b, off)
+}
+
+// seek sets the offset for the next Read or Write on file to offset, interpreted
+// according to whence: 0 means relative to the origin of the file, 1 means
+// relative to the current offset, and 2 means relative to the end.
+// It returns the new offset and an error, if any.
+func (f *File) seek(offset int64, whence int) (ret int64, err syscall.Error) {
+	return syscall.Seek(f.fd, offset, whence)
+}
+
+// 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
+	var mask = ^uint32(0777)
+
+	d.Null()
+	odir, e := dirstat(name)
+	if iserror(e) {
+		return &PathError{"chmod", name, e}
+	}
+
+	d.Mode = (odir.Mode & mask) | (mode &^ mask)
+	if e := syscall.Wstat(name, pdir(nil, &d)); iserror(e) {
+		return &PathError{"chmod", 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
+}