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// +build aix darwin dragonfly freebsd hurd js,wasm linux netbsd openbsd solaris windows
6
7package poll
8
9import (
10	"io"
11	"syscall"
12)
13
14// eofError returns io.EOF when fd is available for reading end of
15// file.
16func (fd *FD) eofError(n int, err error) error {
17	if n == 0 && err == nil && fd.ZeroReadIsEOF {
18		return io.EOF
19	}
20	return err
21}
22
23// Fchmod wraps syscall.Fchmod.
24func (fd *FD) Fchmod(mode uint32) error {
25	if err := fd.incref(); err != nil {
26		return err
27	}
28	defer fd.decref()
29	return syscall.Fchmod(fd.Sysfd, mode)
30}
31
32// Fchown wraps syscall.Fchown.
33func (fd *FD) Fchown(uid, gid int) error {
34	if err := fd.incref(); err != nil {
35		return err
36	}
37	defer fd.decref()
38	return syscall.Fchown(fd.Sysfd, uid, gid)
39}
40
41// Ftruncate wraps syscall.Ftruncate.
42func (fd *FD) Ftruncate(size int64) error {
43	if err := fd.incref(); err != nil {
44		return err
45	}
46	defer fd.decref()
47	return syscall.Ftruncate(fd.Sysfd, size)
48}
49