ioctl_zos.go

     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  }
    75
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