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|
package ioctl
import (
"fmt"
"os"
"reflect"
"syscall"
)
const (
nrBits = 8
typeBits = 8
sizeBits = 14
dirBits = 2
)
const (
nrMask = (1 << nrBits) - 1
typeMask = (1 << typeBits) - 1
sizeMask = (1 << sizeBits) - 1
dirMask = (1 << dirBits) - 1
)
const (
nrShift = 0
typeShift = nrShift + nrBits
sizeShift = typeShift + typeBits
dirShift = sizeShift + sizeBits
)
const (
None = 0
Write = 1
Read = 2
)
func IOC(dir, typ, nr, size uintptr) uintptr {
return (dir << dirShift) |
(typ << typeShift) |
(nr << nrShift) |
(size << sizeShift)
}
func IO(typ, nr uintptr) uintptr {
return IOC(None, typ, nr, 0)
}
func IOR(typ, nr, size uintptr) uintptr {
return IOC(Read, typ, nr, size)
}
func IOW(typ, nr, size uintptr) uintptr {
return IOC(Write, typ, nr, size)
}
func IOWR(typ, nr, size uintptr) uintptr {
return IOC(Read|Write, typ, nr, size)
}
func Ioctl(f *os.File, ioc uintptr, addr uintptr) error {
_, _, e := syscall.Syscall(syscall.SYS_IOCTL, f.Fd(), ioc, addr)
if e != 0 {
return e
}
return nil
}
func Do(f *os.File, ioc uintptr, arg interface{}) error {
var addr uintptr
if arg != nil {
v := reflect.ValueOf(arg)
switch v.Kind() {
case reflect.Ptr:
addr = v.Elem().UnsafeAddr()
case reflect.Slice:
addr = v.Index(0).UnsafeAddr()
default:
return fmt.Errorf("expected ptr or slice, got %T", arg)
}
}
return Ioctl(f, ioc, addr)
}
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