ioctl.go

// battery
// Copyright (C) 2016,2023 Karol 'Kenji Takahashi' Woźniak
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the "Software"),
// to deal in the Software without restriction, including without limitation
// the rights to use, copy, modify, merge, publish, distribute, sublicense,
// and/or sell copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
// OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
// IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
// TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE
// OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

//go:build freebsd || dragonfly || netbsd

package battery

import (
	"unsafe"

	"golang.org/x/sys/unix"
)

func ioctl(fd int, nr int64, typ byte, size uintptr, retptr unsafe.Pointer) error {
	_, _, errno := unix.Syscall(
		unix.SYS_IOCTL,
		uintptr(fd),
		// Some magicks derived from sys/ioccom.h.
		uintptr((0x40000000|0x80000000)|
			((int64(size)&(1<<13-1))<<16)|
			(int64(typ)<<8)|
			nr,
		),
		uintptr(retptr),
	)
	if errno != 0 {
		return errno
	}
	return nil
}