// This file is called cgo_unix.go, but to allow syscalls-to-libc-based
// implementations to share the code, it does not use cgo directly.
// Instead of C.foo it uses _C_foo, which is defined in either
// cgo_unix_cgo.go or cgo_unix_syscall.go

//go:build !netgo && ((cgo && unix) || darwin)

package net

import (
	"context"
	"errors"
	"internal/bytealg"
	"net/netip"
	"syscall"
	"unsafe"

)

// Defined by Linux - the type number for tmpfs mounts.
const (
	linuxTmpfsMagic     = 0x01021994
	linuxHugetlbfsMagic = 0x958458f6
)

// realMountDetector implements mountDetector in terms of syscalls.
type realMountDetector struct {
	mounter mount.Interface
}

// getPageSize obtains page size from the 'pagesize' mount option of the
// mounted volume

	VM_REGION_BASIC_INFO_64       = C.VM_REGION_BASIC_INFO_64
)

type StackT C.struct_sigaltstack
type Sighandler C.union___sigaction_u

type Sigaction C.struct___sigaction // used in syscalls
type Usigaction C.struct_sigaction  // used by sigaction second argument
type Sigset C.sigset_t
type Sigval C.union_sigval
type Siginfo C.siginfo_t
type Timeval C.struct_timeval
type Itimerval C.struct_itimerval

}

func (t *Target) UsesLibc() bool {
	t.mustSetHeadType()
	switch t.HeadType {
	case objabi.Haix, objabi.Hdarwin, objabi.Hopenbsd, objabi.Hsolaris, objabi.Hwindows:
		// platforms where we use libc for syscalls.
		return true
	}
	return false

	getPodEtcHostsStats(podUID types.UID, rootFsInfo *cadvisorapiv2.FsInfo) (*statsapi.FsStats, error)
}

type hostStatsProvider struct {
	// osInterface is the interface for syscalls.
	osInterface kubecontainer.OSInterface
	// podEtcHostsPathFunc fetches a pod etc hosts path by uid.
	podEtcHostsPathFunc PodEtcHostsPathFunc
	// podLogsDirectory is the root directory path for pod logs.

func Fadvise(fd int, offset int64, length int64, advice int) (err error) {
	_, _, e1 := Syscall6(SYS_FADVISE64_64, uintptr(fd), uintptr(advice), uintptr(offset>>32), uintptr(offset), uintptr(length>>32), uintptr(length))
	if e1 != 0 {
		err = errnoErr(e1)
	}
	return
}

func seek(fd int, offset int64, whence int) (int64, syscall.Errno) {
	var newoffset int64
	offsetLow := uint32(offset & 0xffffffff)

}

//sys	syncFileRange2(fd int, flags int, off int64, n int64) (err error) = SYS_SYNC_FILE_RANGE2

func SyncFileRange(fd int, off int64, n int64, flags int) error {
	// The sync_file_range and sync_file_range2 syscalls differ only in the
	// order of their arguments.
	return syncFileRange2(fd, flags, off, n)
}

//sys	kexecFileLoad(kernelFd int, initrdFd int, cmdlineLen int, cmdline string, flags int) (err error)

// go run mksysnum.go /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS11.1.sdk/usr/include/sys/syscall.h
// Code generated by the command above; see README.md. DO NOT EDIT.

//go:build arm64 && darwin

package unix

// Deprecated: Use libSystem wrappers instead of direct syscalls.
const (
	SYS_SYSCALL                        = 0
	SYS_EXIT                           = 1
	SYS_FORK                           = 2

}

//sys	syncFileRange2(fd int, flags int, off int64, n int64) (err error) = SYS_SYNC_FILE_RANGE2

func SyncFileRange(fd int, off int64, n int64, flags int) error {
	// The sync_file_range and sync_file_range2 syscalls differ only in the
	// order of their arguments.
	return syncFileRange2(fd, flags, off, n)

		// a non-NULL pointer of length zero. Preserve the property of nilness,
		// even if we can't use dest directly.
		return unsafe.Pointer(&_zero)
	}
	return nil
}

// FreeBSD and NetBSD implement their own syscalls to handle extended attributes

func Getxattr(file string, attr string, dest []byte) (sz int, err error) {
	d := initxattrdest(dest, 0)
	destsize := len(dest)

	nsid, a, err := xattrnamespace(attr)
	if err != nil {