mirror of
https://github.com/golang/go
synced 2024-11-13 16:40:22 -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.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package file
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import (
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"os"
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"syscall"
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)
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type File struct {
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fd int // file descriptor number
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name string // file name at Open time
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}
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func newFile(fd int, name string) *File {
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if fd < 0 {
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return nil
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}
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return &File{fd, name}
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}
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var (
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Stdin = newFile(syscall.Stdin, "/dev/stdin")
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Stdout = newFile(syscall.Stdout, "/dev/stdout")
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Stderr = newFile(syscall.Stderr, "/dev/stderr")
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)
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func OpenFile(name string, mode int, perm uint32) (file *File, err error) {
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r, err := syscall.Open(name, mode, perm)
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return newFile(r, name), err
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}
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const (
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O_RDONLY = syscall.O_RDONLY
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O_RDWR = syscall.O_RDWR
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O_CREATE = syscall.O_CREAT
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O_TRUNC = syscall.O_TRUNC
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)
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func Open(name string) (file *File, err error) {
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return OpenFile(name, O_RDONLY, 0)
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}
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func Create(name string) (file *File, err error) {
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return OpenFile(name, O_RDWR|O_CREATE|O_TRUNC, 0666)
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}
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func (file *File) Close() error {
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if file == nil {
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return os.ErrInvalid
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}
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err := syscall.Close(file.fd)
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file.fd = -1 // so it can't be closed again
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return err
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}
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func (file *File) Read(b []byte) (ret int, err error) {
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if file == nil {
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return -1, os.ErrInvalid
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}
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r, err := syscall.Read(file.fd, b)
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return int(r), err
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}
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func (file *File) Write(b []byte) (ret int, err error) {
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if file == nil {
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return -1, os.ErrInvalid
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}
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r, err := syscall.Write(file.fd, b)
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return int(r), err
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}
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func (file *File) String() string {
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return file.name
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}
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