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1 // Copyright 2020 The Go Authors. All rights reserved.
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2 // Use of this source code is governed by a BSD-style
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3 // license that can be found in the LICENSE file.
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4
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5 //go:build zos && s390x
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6 // +build zos,s390x
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7
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8 package unix
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9
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10 import (
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11 "runtime"
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12 "unsafe"
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13 )
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14
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15 // ioctl itself should not be exposed directly, but additional get/set
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16 // functions for specific types are permissible.
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17
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18 // IoctlSetInt performs an ioctl operation which sets an integer value
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19 // on fd, using the specified request number.
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20 func IoctlSetInt(fd int, req uint, value int) error {
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21 return ioctl(fd, req, uintptr(value))
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22 }
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23
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24 // IoctlSetWinsize performs an ioctl on fd with a *Winsize argument.
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25 //
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26 // To change fd's window size, the req argument should be TIOCSWINSZ.
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27 func IoctlSetWinsize(fd int, req uint, value *Winsize) error {
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28 // TODO: if we get the chance, remove the req parameter and
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29 // hardcode TIOCSWINSZ.
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30 err := ioctl(fd, req, uintptr(unsafe.Pointer(value)))
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31 runtime.KeepAlive(value)
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32 return err
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33 }
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34
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35 // IoctlSetTermios performs an ioctl on fd with a *Termios.
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36 //
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37 // The req value is expected to be TCSETS, TCSETSW, or TCSETSF
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38 func IoctlSetTermios(fd int, req uint, value *Termios) error {
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39 if (req != TCSETS) && (req != TCSETSW) && (req != TCSETSF) {
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40 return ENOSYS
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41 }
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42 err := Tcsetattr(fd, int(req), value)
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43 runtime.KeepAlive(value)
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44 return err
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45 }
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46
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47 // IoctlGetInt performs an ioctl operation which gets an integer value
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48 // from fd, using the specified request number.
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49 //
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50 // A few ioctl requests use the return value as an output parameter;
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51 // for those, IoctlRetInt should be used instead of this function.
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52 func IoctlGetInt(fd int, req uint) (int, error) {
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53 var value int
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54 err := ioctl(fd, req, uintptr(unsafe.Pointer(&value)))
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55 return value, err
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56 }
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57
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58 func IoctlGetWinsize(fd int, req uint) (*Winsize, error) {
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59 var value Winsize
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60 err := ioctl(fd, req, uintptr(unsafe.Pointer(&value)))
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61 return &value, err
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62 }
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63
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64 // IoctlGetTermios performs an ioctl on fd with a *Termios.
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65 //
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66 // The req value is expected to be TCGETS
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67 func IoctlGetTermios(fd int, req uint) (*Termios, error) {
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68 var value Termios
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69 if req != TCGETS {
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70 return &value, ENOSYS
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71 }
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72 err := Tcgetattr(fd, &value)
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73 return &value, err
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74 }
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