ioctl_zos.go (2163B)
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 8 package unix 9 10 import ( 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. 20 func 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. 27 func 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 38 func 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. 52 func 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 58 func 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 67 func 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 }