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// 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 fd
import Syscall "syscall"
export type FD struct {
fildes int64; // file descriptor number
name string; // file name at Open time
}
func NewFD(fd int64, name string) *FD {
if fd < 0 {
return nil
}
n := new(FD);
n.fildes = fd;
n.name = name;
return n
}
export var (
Stdin = NewFD(0, "/dev/stdin");
Stdout = NewFD(1, "/dev/stdout");
Stderr = NewFD(2, "/dev/stderr");
)
export func Open(name string, mode int64, perm int64) (fd *FD, errno int64) {
r, e := Syscall.open(name, mode, perm);
return NewFD(r, name), e
}
func (fd *FD) Close() int64 {
if fd == nil {
return Syscall.EINVAL
}
r, e := Syscall.close(fd.fildes);
fd.fildes = -1; // so it can't be closed again
return 0
}
func (fd *FD) Read(b []byte) (ret int64, errno int64) {
if fd == nil {
return -1, Syscall.EINVAL
}
r, e := Syscall.read(fd.fildes, &b[0], int64(len(b)));
return r, e
}
func (fd *FD) Write(b []byte) (ret int64, errno int64) {
if fd == nil {
return -1, Syscall.EINVAL
}
r, e := Syscall.write(fd.fildes, &b[0], int64(len(b)));
return r, e
}
func (fd *FD) Name() string {
return fd.name
}
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