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  
     7  package unix
     8  
     9  import (
    10  	"runtime"
    11  	"unsafe"
    12  )
    13  
    14  // ioctl itself should not be exposed directly, but additional get/set
    15  // functions for specific types are permissible.
    16  
    17  // IoctlSetInt performs an ioctl operation which sets an integer value
    18  // on fd, using the specified request number.
    19  func IoctlSetInt(fd int, req int, value int) error {
    20  	return ioctl(fd, req, uintptr(value))
    21  }
    22  
    23  // IoctlSetWinsize performs an ioctl on fd with a *Winsize argument.
    24  //
    25  // To change fd's window size, the req argument should be TIOCSWINSZ.
    26  func IoctlSetWinsize(fd int, req int, value *Winsize) error {
    27  	// TODO: if we get the chance, remove the req parameter and
    28  	// hardcode TIOCSWINSZ.
    29  	return ioctlPtr(fd, req, unsafe.Pointer(value))
    30  }
    31  
    32  // IoctlSetTermios performs an ioctl on fd with a *Termios.
    33  //
    34  // The req value is expected to be TCSETS, TCSETSW, or TCSETSF
    35  func IoctlSetTermios(fd int, req int, value *Termios) error {
    36  	if (req != TCSETS) && (req != TCSETSW) && (req != TCSETSF) {
    37  		return ENOSYS
    38  	}
    39  	err := Tcsetattr(fd, int(req), value)
    40  	runtime.KeepAlive(value)
    41  	return err
    42  }
    43  
    44  // IoctlGetInt performs an ioctl operation which gets an integer value
    45  // from fd, using the specified request number.
    46  //
    47  // A few ioctl requests use the return value as an output parameter;
    48  // for those, IoctlRetInt should be used instead of this function.
    49  func IoctlGetInt(fd int, req int) (int, error) {
    50  	var value int
    51  	err := ioctlPtr(fd, req, unsafe.Pointer(&value))
    52  	return value, err
    53  }
    54  
    55  func IoctlGetWinsize(fd int, req int) (*Winsize, error) {
    56  	var value Winsize
    57  	err := ioctlPtr(fd, req, unsafe.Pointer(&value))
    58  	return &value, err
    59  }
    60  
    61  // IoctlGetTermios performs an ioctl on fd with a *Termios.
    62  //
    63  // The req value is expected to be TCGETS
    64  func IoctlGetTermios(fd int, req int) (*Termios, error) {
    65  	var value Termios
    66  	if req != TCGETS {
    67  		return &value, ENOSYS
    68  	}
    69  	err := Tcgetattr(fd, &value)
    70  	return &value, err
    71  }
    72
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