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| 1 // Copyright 2009 The Go Authors. All rights reserved. | |
| 2 // Use of this source code is governed by a BSD-style | |
| 3 // license that can be found in the LICENSE file. | |
| 4 | |
| 5 package file | |
| 6 | |
| 7 import ( | |
| 8 "os" | |
| 9 "syscall" | |
| 10 ) | |
| 11 | |
| 12 type File struct { | |
| 13 fd int // file descriptor number | |
| 14 name string // file name at Open time | |
| 15 } | |
| 16 | |
| 17 func newFile(fd int, name string) *File { | |
| 18 if fd < 0 { | |
| 19 return nil | |
| 20 } | |
| 21 return &File{fd, name} | |
| 22 } | |
| 23 | |
| 24 var ( | |
| 25 Stdin = newFile(syscall.Stdin, "/dev/stdin") | |
| 26 Stdout = newFile(syscall.Stdout, "/dev/stdout") | |
| 27 Stderr = newFile(syscall.Stderr, "/dev/stderr") | |
| 28 ) | |
| 29 | |
| 30 func OpenFile(name string, mode int, perm uint32) (file *File, err error) { | |
| 31 r, err := syscall.Open(name, mode, perm) | |
| 32 return newFile(r, name), err | |
| 33 } | |
| 34 | |
| 35 const ( | |
| 36 O_RDONLY = syscall.O_RDONLY | |
| 37 O_RDWR = syscall.O_RDWR | |
| 38 O_CREATE = syscall.O_CREAT | |
| 39 O_TRUNC = syscall.O_TRUNC | |
| 40 ) | |
| 41 | |
| 42 func Open(name string) (file *File, err error) { | |
| 43 return OpenFile(name, O_RDONLY, 0) | |
| 44 } | |
| 45 | |
| 46 func Create(name string) (file *File, err error) { | |
| 47 return OpenFile(name, O_RDWR|O_CREATE|O_TRUNC, 0666) | |
| 48 } | |
| 49 | |
| 50 func (file *File) Close() error { | |
| 51 if file == nil { | |
| 52 return os.ErrInvalid | |
| 53 } | |
| 54 err := syscall.Close(file.fd) | |
| 55 file.fd = -1 // so it can't be closed again | |
| 56 return err | |
| 57 } | |
| 58 | |
| 59 func (file *File) Read(b []byte) (ret int, err error) { | |
| 60 if file == nil { | |
| 61 return -1, os.ErrInvalid | |
| 62 } | |
| 63 r, err := syscall.Read(file.fd, b) | |
| 64 return int(r), err | |
| 65 } | |
| 66 | |
| 67 func (file *File) Write(b []byte) (ret int, err error) { | |
| 68 if file == nil { | |
| 69 return -1, os.ErrInvalid | |
| 70 } | |
| 71 r, err := syscall.Write(file.fd, b) | |
| 72 return int(r), err | |
| 73 } | |
| 74 | |
| 75 func (file *File) String() string { | |
| 76 return file.name | |
| 77 } | |
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