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