golang ioctl 代码
文件路径：/src/cmd/vendor/golang.org/x/sys/unix/ioctl.go
/ Copyright 2018 The Go Authors. All rights reserved.
/ Use of this source code is governed by a BSD-style
/ license that can be found in the LICENSE file.
/go:build aix || darwin || dragonfly || freebsd || linux || netbsd || openbsd || solaris
/ +build aix darwin dragonfly freebsd linux netbsd openbsd solaris
package unix
import (
"runtime"
"unsafe"
)
/ ioctl itself should not be exposed directly, but additional get/set
/ functions for specific types are permissible.
/ IoctlSetInt performs an ioctl operation which sets an integer value
/ on fd, using the specified request number.
func IoctlSetInt(fd int, req uint, value int) error {
return ioctl(fd, req, uintptr(value))
}
/ IoctlSetPointerInt performs an ioctl operation which sets an
/ integer value on fd, using the specified request number. The ioctl
/ argument is called with a pointer to the integer value, rather than
/ passing the integer value directly.
func IoctlSetPointerInt(fd int, req uint, value int) error {
v := int32(value)
return ioctl(fd, req, uintptr(unsafe.Pointer(&v)))
}
/ IoctlSetWinsize performs an ioctl on fd with a *Winsize argument.
/
/ To change fd's window size, the req argument should be TIOCSWINSZ.
func IoctlSetWinsize(fd int, req uint, value *Winsize) error {
/ TODO: if we get the chance, remove the req parameter and
/ hardcode TIOCSWINSZ.
err := ioctl(fd, req, uintptr(unsafe.Pointer(value)))
runtime.KeepAlive(value)
return err
}
/ IoctlSetTermios performs an ioctl on fd with a *Termios.
/
/ The req value will usually be TCSETA or TIOCSETA.
func IoctlSetTermios(fd int, req uint, value *Termios) error {
/ TODO: if we get the chance, remove the req parameter.
err := ioctl(fd, req, uintptr(unsafe.Pointer(value)))
runtime.KeepAlive(value)
return err
}
/ IoctlGetInt performs an ioctl operation which gets an integer value
/ from fd, using the specified request number.
/
/ A few ioctl requests use the return value as an output parameter;
/ for those, IoctlRetInt should be used instead of this function.
func IoctlGetInt(fd int, req uint) (int, error) {
var value int
err := ioctl(fd, req, uintptr(unsafe.Pointer(&value)))
return value, err
}
func IoctlGetWinsize(fd int, req uint) (*Winsize, error) {
var value Winsize
err := ioctl(fd, req, uintptr(unsafe.Pointer(&value)))
return &value, err
}
func IoctlGetTermios(fd int, req uint) (*Termios, error) {
var value Termios
err := ioctl(fd, req, uintptr(unsafe.Pointer(&value)))
return &value, err
}