return err
}

func Uname(uname *Utsname) error {
	mib := []_C_int{CTL_KERN, KERN_OSTYPE}
	n := unsafe.Sizeof(uname.Sysname)
	if err := sysctlUname(mib, &uname.Sysname[0], &n); err != nil {
		return err
	}
	uname.Sysname[unsafe.Sizeof(uname.Sysname)-1] = 0

	mib = []_C_int{CTL_KERN, KERN_HOSTNAME}
	n = unsafe.Sizeof(uname.Nodename)
	if err := sysctlUname(mib, &uname.Nodename[0], &n); err != nil {
		return err
	}

//go:build freebsd || dragonfly

package os

import (
	"syscall"
	"unsafe"
)

func executable() (string, error) {
	mib := [4]int32{_CTL_KERN, _KERN_PROC, _KERN_PROC_PATHNAME, -1}

	n := uintptr(0)
	// get length
	_, _, err := syscall.Syscall6(syscall.SYS___SYSCTL, uintptr(unsafe.Pointer(&mib[0])), 4, 0, uintptr(unsafe.Pointer(&n)), 0, 0)
	if err != 0 {
		return "", err
	}
	if n == 0 { // shouldn't happen
		return "", nil

}

func Uname(uname *Utsname) error {
	mib := []_C_int{CTL_KERN, KERN_OSTYPE}
	n := unsafe.Sizeof(uname.Sysname)
	if err := sysctl(mib, &uname.Sysname[0], &n, nil, 0); err != nil {
		return err
	}

	mib = []_C_int{CTL_KERN, KERN_HOSTNAME}
	n = unsafe.Sizeof(uname.Nodename)
	if err := sysctl(mib, &uname.Nodename[0], &n, nil, 0); err != nil {
		return err
	}

	mib = []_C_int{CTL_KERN, KERN_OSRELEASE}

)

func sysctlInt(mib []uint32) (int32, bool) {
	var out int32
	nout := unsafe.Sizeof(out)
	ret := sysctl(&mib[0], uint32(len(mib)), (*byte)(unsafe.Pointer(&out)), &nout, nil, 0)
	if ret < 0 {
		return 0, false
	}
	return out, true
}

func sysctlUint64(mib []uint32) (uint64, bool) {
	var out uint64
	nout := unsafe.Sizeof(out)
	ret := sysctl(&mib[0], uint32(len(mib)), (*byte)(unsafe.Pointer(&out)), &nout, nil, 0)

	if err := sysctl(mib, &uname.Nodename[0], &n, nil, 0); err != nil {
		return err
	}

	mib = []_C_int{CTL_KERN, KERN_OSRELEASE}
	n = unsafe.Sizeof(uname.Release)
	if err := sysctl(mib, &uname.Release[0], &n, nil, 0); err != nil {
		return err
	}

	mib = []_C_int{CTL_KERN, KERN_VERSION}
	n = unsafe.Sizeof(uname.Version)
	if err := sysctl(mib, &uname.Version[0], &n, nil, 0); err != nil {
		return err
	}

	_CTL_QUERY     = 0
	_CTL_QUERY_MIB = 3
)

// sysctlnametomib fill mib with dynamically assigned sysctl entries of name,
// return count of effected mib slots, return 0 on error.
func sysctlnametomib(name []byte, mib *[_CTL_MAXNAME]uint32) uint32 {
	oid := [2]uint32{_CTL_QUERY, _CTL_QUERY_MIB}
	miblen := uintptr(_CTL_MAXNAME)
	if sysctl(&oid[0], 2, (*byte)(unsafe.Pointer(mib)), &miblen, (*byte)(unsafe.Pointer(&name[0])), (uintptr)(len(name))) < 0 {

	}

	mib = []_C_int{CTL_KERN, KERN_HOSTNAME}
	n = unsafe.Sizeof(uname.Nodename)
	if err := sysctl(mib, &uname.Nodename[0], &n, nil, 0); err != nil && !errors.Is(err, ENOMEM) {
		return err
	}

	mib = []_C_int{CTL_KERN, KERN_OSRELEASE}
	n = unsafe.Sizeof(uname.Release)
	if err := sysctl(mib, &uname.Release[0], &n, nil, 0); err != nil && !errors.Is(err, ENOMEM) {
		return err
	}

func getncpu() int32 {
	mib := [2]uint32{_CTL_HW, _HW_NCPU}
	out := uint32(0)
	nout := unsafe.Sizeof(out)
	ret := sysctl(&mib[0], 2, (*byte)(unsafe.Pointer(&out)), &nout, nil, 0)
	if ret >= 0 {
		return int32(out)
	}
	return 1
}

func getPageSize() uintptr {
	mib := [2]uint32{_CTL_HW, _HW_PAGESIZE}
	out := uint32(0)
	nout := unsafe.Sizeof(out)

			t.Skip("fallocate is not supported")
		}
		if err == syscall.EINTR {
			continue // try again
		}
		if err != nil {
			t.Fatalf("fallocate failed: %v", err)
		}
		break
	}

	// Mmap 1 MiB initially, and grow to 2 and 3 MiB.
	// Check if the file size and disk usage is expected.
	for _, sz := range []int64{1 << 20, 2 << 20, 3 << 20} {
		err = out.Mmap(uint64(sz))
		if err != nil {
			t.Fatalf("Mmap failed: %v", err)
		}

// license that can be found in the LICENSE file.

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

package route

import _ "unsafe" // for linkname

//go:linkname sysctl syscall.sysctl