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 uint, 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 uint, value *Winsize) error { 28 // TODO: if we get the chance, remove the req parameter and 29 // hardcode TIOCSWINSZ. 30 err := ioctl(fd, req, uintptr(unsafe.Pointer(value))) 31 runtime.KeepAlive(value) 32 return err 33} 34 35// IoctlSetTermios performs an ioctl on fd with a *Termios. 36// 37// The req value is expected to be TCSETS, TCSETSW, or TCSETSF 38func IoctlSetTermios(fd int, req uint, value *Termios) error { 39 if (req != TCSETS) && (req != TCSETSW) && (req != TCSETSF) { 40 return ENOSYS 41 } 42 err := Tcsetattr(fd, int(req), value) 43 runtime.KeepAlive(value) 44 return err 45} 46 47// IoctlGetInt performs an ioctl operation which gets an integer value 48// from fd, using the specified request number. 49// 50// A few ioctl requests use the return value as an output parameter; 51// for those, IoctlRetInt should be used instead of this function. 52func IoctlGetInt(fd int, req uint) (int, error) { 53 var value int 54 err := ioctl(fd, req, uintptr(unsafe.Pointer(&value))) 55 return value, err 56} 57 58func IoctlGetWinsize(fd int, req uint) (*Winsize, error) { 59 var value Winsize 60 err := ioctl(fd, req, uintptr(unsafe.Pointer(&value))) 61 return &value, err 62} 63 64// IoctlGetTermios performs an ioctl on fd with a *Termios. 65// 66// The req value is expected to be TCGETS 67func IoctlGetTermios(fd int, req uint) (*Termios, error) { 68 var value Termios 69 if req != TCGETS { 70 return &value, ENOSYS 71 } 72 err := Tcgetattr(fd, &value) 73 return &value, err 74} 75