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https://github.com/golang/go
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293c8f8c65
will bring document in line in a later CL, which may include revisiting some of the names R=rsc DELTA=58 (0 added, 0 deleted, 58 changed) OCL=22906 CL=22908
63 lines
1.3 KiB
Go
63 lines
1.3 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 fd
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import (
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"os";
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"syscall";
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)
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export type FD struct {
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fildes int64; // file descriptor number
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name string; // file name at Open time
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}
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func newFD(fd int64, name string) *FD {
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if fd < 0 {
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return nil
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}
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return &FD{fd, name}
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}
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export var (
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Stdin = newFD(0, "/dev/stdin");
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Stdout = newFD(1, "/dev/stdout");
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Stderr = newFD(2, "/dev/stderr");
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)
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export func Open(name string, mode int64, perm int64) (fd *FD, err *os.Error) {
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r, e := syscall.open(name, mode, perm);
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return newFD(r, name), os.ErrnoToError(e)
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}
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func (fd *FD) Close() *os.Error {
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if fd == nil {
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return os.EINVAL
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}
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r, e := syscall.close(fd.fildes);
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fd.fildes = -1; // so it can't be closed again
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return nil
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}
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func (fd *FD) Read(b []byte) (ret int, err *os.Error) {
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if fd == nil {
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return -1, os.EINVAL
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}
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r, e := syscall.read(fd.fildes, &b[0], int64(len(b)));
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return int(r), os.ErrnoToError(e)
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}
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func (fd *FD) Write(b []byte) (ret int, err *os.Error) {
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if fd == nil {
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return -1, os.EINVAL
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}
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r, e := syscall.write(fd.fildes, &b[0], int64(len(b)));
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return int(r), os.ErrnoToError(e)
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}
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func (fd *FD) String() string {
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return fd.name
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}
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