1// Copyright 2020 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//go:build zos && s390x
 6// +build zos,s390x
 7
 8package unix
 9
10import (
11	"runtime"
12	"unsafe"
13)
14
15// ioctl itself should not be exposed directly, but additional get/set
16// functions for specific types are permissible.
17
18// IoctlSetInt performs an ioctl operation which sets an integer value
19// on fd, using the specified request number.
20func IoctlSetInt(fd int, req int, value int) error {
21	return ioctl(fd, req, uintptr(value))
22}
23
24// IoctlSetWinsize performs an ioctl on fd with a *Winsize argument.
25//
26// To change fd's window size, the req argument should be TIOCSWINSZ.
27func IoctlSetWinsize(fd int, req int, value *Winsize) error {
28	// TODO: if we get the chance, remove the req parameter and
29	// hardcode TIOCSWINSZ.
30	return ioctlPtr(fd, req, unsafe.Pointer(value))
31}
32
33// IoctlSetTermios performs an ioctl on fd with a *Termios.
34//
35// The req value is expected to be TCSETS, TCSETSW, or TCSETSF
36func IoctlSetTermios(fd int, req int, value *Termios) error {
37	if (req != TCSETS) && (req != TCSETSW) && (req != TCSETSF) {
38		return ENOSYS
39	}
40	err := Tcsetattr(fd, int(req), value)
41	runtime.KeepAlive(value)
42	return err
43}
44
45// IoctlGetInt performs an ioctl operation which gets an integer value
46// from fd, using the specified request number.
47//
48// A few ioctl requests use the return value as an output parameter;
49// for those, IoctlRetInt should be used instead of this function.
50func IoctlGetInt(fd int, req int) (int, error) {
51	var value int
52	err := ioctlPtr(fd, req, unsafe.Pointer(&value))
53	return value, err
54}
55
56func IoctlGetWinsize(fd int, req int) (*Winsize, error) {
57	var value Winsize
58	err := ioctlPtr(fd, req, unsafe.Pointer(&value))
59	return &value, err
60}
61
62// IoctlGetTermios performs an ioctl on fd with a *Termios.
63//
64// The req value is expected to be TCGETS
65func IoctlGetTermios(fd int, req int) (*Termios, error) {
66	var value Termios
67	if req != TCGETS {
68		return &value, ENOSYS
69	}
70	err := Tcgetattr(fd, &value)
71	return &value, err
72}