mirror of
https://github.com/golang/go
synced 2024-11-24 22:00:09 -07:00
56069f0333
The set of errors forwarded by the os package varied with system and was therefore non-portable. Three helpers added for portable error checking: IsExist, IsNotExist, and IsPermission. One or two more may need to come, but let's keep the set very small to discourage thinking about errors that way. R=mikioh.mikioh, gustavo, r, rsc CC=golang-dev https://golang.org/cl/5672047
78 lines
1.5 KiB
Go
78 lines
1.5 KiB
Go
// 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 int // file descriptor number
|
|
name string // file name at Open time
|
|
}
|
|
|
|
func newFile(fd int, name string) *File {
|
|
if fd < 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.ErrInvalid
|
|
}
|
|
err := syscall.Close(file.fd)
|
|
file.fd = -1 // 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.ErrInvalid
|
|
}
|
|
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.ErrInvalid
|
|
}
|
|
r, err := syscall.Write(file.fd, b)
|
|
return int(r), err
|
|
}
|
|
|
|
func (file *File) String() string {
|
|
return file.name
|
|
}
|