golang.org/x/sys@v0.9.0/unix/ioctl_zos.go (about)

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