| // 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 file |
| |
| import ( |
| "os" |
| "syscall" |
| ) |
| |
| type File struct { |
| fd syscall.Handle // file descriptor number |
| name string // file name at Open time |
| } |
| |
| func newFile(fd syscall.Handle, name string) *File { |
| if fd == ^syscall.Handle(0) { |
| return nil |
| } |
| return &File{fd, name} |
| } |
| |
| var ( |
| Stdin = newFile(syscall.Stdin, "/dev/stdin") |
| Stdout = newFile(syscall.Stdout, "/dev/stdout") |
| Stderr = newFile(syscall.Stderr, "/dev/stderr") |
| ) |
| |
| func OpenFile(name string, mode int, perm uint32) (file *File, err error) { |
| r, err := syscall.Open(name, mode, perm) |
| return newFile(r, name), err |
| } |
| |
| const ( |
| O_RDONLY = syscall.O_RDONLY |
| O_RDWR = syscall.O_RDWR |
| O_CREATE = syscall.O_CREAT |
| O_TRUNC = syscall.O_TRUNC |
| ) |
| |
| func Open(name string) (file *File, err error) { |
| return OpenFile(name, O_RDONLY, 0) |
| } |
| |
| func Create(name string) (file *File, err error) { |
| return OpenFile(name, O_RDWR|O_CREATE|O_TRUNC, 0666) |
| } |
| |
| func (file *File) Close() error { |
| if file == nil { |
| return os.EINVAL |
| } |
| err := syscall.Close(file.fd) |
| file.fd = syscall.InvalidHandle // so it can't be closed again |
| return err |
| } |
| |
| func (file *File) Read(b []byte) (ret int, err error) { |
| if file == nil { |
| return -1, os.EINVAL |
| } |
| r, err := syscall.Read(file.fd, b) |
| return int(r), err |
| } |
| |
| func (file *File) Write(b []byte) (ret int, err error) { |
| if file == nil { |
| return -1, os.EINVAL |
| } |
| r, err := syscall.Write(file.fd, b) |
| return int(r), err |
| } |
| |
| func (file *File) String() string { |
| return file.name |
| } |