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1 // Copyright 2018 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 aix || darwin || dragonfly || freebsd || linux || netbsd || openbsd || solaris
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6 // +build aix darwin dragonfly freebsd linux netbsd openbsd solaris
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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 // IoctlSetPointerInt performs an ioctl operation which sets an
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25 // integer value on fd, using the specified request number. The ioctl
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26 // argument is called with a pointer to the integer value, rather than
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27 // passing the integer value directly.
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28 func IoctlSetPointerInt(fd int, req uint, value int) error {
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29 v := int32(value)
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30 return ioctl(fd, req, uintptr(unsafe.Pointer(&v)))
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31 }
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32
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33 // IoctlSetWinsize performs an ioctl on fd with a *Winsize argument.
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34 //
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35 // To change fd's window size, the req argument should be TIOCSWINSZ.
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36 func IoctlSetWinsize(fd int, req uint, value *Winsize) error {
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37 // TODO: if we get the chance, remove the req parameter and
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38 // hardcode TIOCSWINSZ.
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39 err := ioctl(fd, req, uintptr(unsafe.Pointer(value)))
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40 runtime.KeepAlive(value)
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41 return err
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42 }
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43
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44 // IoctlSetTermios performs an ioctl on fd with a *Termios.
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45 //
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46 // The req value will usually be TCSETA or TIOCSETA.
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47 func IoctlSetTermios(fd int, req uint, value *Termios) error {
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48 // TODO: if we get the chance, remove the req parameter.
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49 err := ioctl(fd, req, uintptr(unsafe.Pointer(value)))
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50 runtime.KeepAlive(value)
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51 return err
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52 }
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53
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54 // IoctlGetInt performs an ioctl operation which gets an integer value
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55 // from fd, using the specified request number.
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56 //
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57 // A few ioctl requests use the return value as an output parameter;
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58 // for those, IoctlRetInt should be used instead of this function.
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59 func IoctlGetInt(fd int, req uint) (int, error) {
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60 var value int
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61 err := ioctl(fd, req, uintptr(unsafe.Pointer(&value)))
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62 return value, err
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63 }
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64
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65 func IoctlGetWinsize(fd int, req uint) (*Winsize, error) {
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66 var value Winsize
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67 err := ioctl(fd, req, uintptr(unsafe.Pointer(&value)))
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68 return &value, err
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69 }
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70
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71 func IoctlGetTermios(fd int, req uint) (*Termios, error) {
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72 var value Termios
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73 err := ioctl(fd, req, uintptr(unsafe.Pointer(&value)))
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74 return &value, err
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75 }
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