// syscall defines this global on our behalf to avoid a build dependency on other platforms
func init() {
	execveLibc = execve
}

// Fork, dup fd onto 0..len(fd), and exec(argv0, argvv, envv) in child.
// If a dup or exec fails, write the errno error to pipe.
// (Pipe is close-on-exec so if exec succeeds, it will be closed.)
// In the child, this function must not acquire any locks, because

//go:build openbsd && !mips64

package syscall

import (
	"internal/abi"
)

var dupTrampoline = abi.FuncPCABI0(libc_dup3_trampoline)

func init() {
	execveOpenBSD = execve
}

func syscallInternal(trap, a1, a2, a3 uintptr) (r1, r2 uintptr, err Errno) {
	// OpenBSD 7.5+ no longer supports indirect syscalls. A number of Go
	// packages make use of syscall.Syscall with SYS_IOCTL since it is

  scavenge,
  sweep,
  sweepWaiters,
  testR,
  wakeableSleep
# Above SCHED are things that can call into the scheduler.
< SCHED
# Below SCHED is the scheduler implementation.
< allocmR,
  execR;
allocmR, execR, hchan < sched;
sched < allg, allp;

# Channels
NONE < notifyList;
hchan, notifyList < sudog;

hchan, pollDesc, wakeableSleep < timers;
timers, timerSend < timer < netpollInit;

# Semaphores
NONE < root;

// execveLibc is non-nil on OS using libc syscall, set to execve in exec_libc.go; this
// avoids a build dependency for other platforms.
var execveLibc func(path uintptr, argv uintptr, envp uintptr) Errno
var execveDarwin func(path *byte, argv **byte, envp **byte) error
var execveOpenBSD func(path *byte, argv **byte, envp **byte) error

// Exec invokes the execve(2) system call.
func Exec(argv0 string, argv []string, envv []string) (err error) {

	}
	r, err := Open(name)
	if err != nil {
		t.Fatal(err)
	}
	defer r.Close()
	const n = 100
	var execs [n]string
	// First create n executables.
	for i := 0; i < n; i++ {
		// Rewind r.
		if _, err := r.Seek(0, io.SeekStart); err != nil {
			t.Fatal(err)
		}
		name := filepath.Join(t.TempDir(), "test.exe")
		execs[i] = name
		w, err := Create(name)
		if err != nil {
			t.Fatal(err)
		}

		log.Fatalf("stressExec: exec output = %q; want %q", out, wantOutput)
	}
	Println("did exec")
}

func stressExec() {
	gate := make(chan bool, 10) // max execs at once
	for {
		gate <- true
		go func() {
			doAnExec()
			<-gate
		}()
	}
}

func ringf(in <-chan int, out chan<- int, donec chan bool) {
	for {
		var n int
		select {
		case <-donec:
			return
		case n = <-in:
		}

type Execer interface {
	Exec(query string, args []Value) (Result, error)
}

// ExecerContext is an optional interface that may be implemented by a [Conn].
//
// If a [Conn] does not implement [ExecerContext], the [database/sql.DB.Exec]
// will fall back to [Execer]; if the Conn does not implement Execer either,
// [database/sql.DB.Exec] will first prepare a query, execute the statement, and then
// close the statement.
//

	}

	// non-windows checks
	checks = addSwapCheck(checks)
	checks = addExecChecks(checks, execer)
	checks = append(checks,
		SystemVerificationCheck{},
		HostnameCheck{nodeName: nodeReg.Name},
		KubeletVersionCheck{KubernetesVersion: k8sVersion, exec: execer},
		ServiceCheck{Service: "kubelet", CheckIfActive: false},
		PortOpenCheck{port: kubeadmconstants.KubeletPort})
	return checks

	// the file it points to has been changed we will use the updated symlink.
	argv0, err := exec.LookPath(os.Args[0])
	if err != nil {
		return err
	}

	// Invokes the execve system call.
	// Re-uses the same pid. This preserves the pid over multiple server-respawns.
	return syscall.Exec(argv0, os.Args, os.Environ())
}

// freezeServices will freeze all incoming S3 API calls.

//sys   mmap(addr uintptr, length uintptr, prot int, flag int, fd int, pos int64) (ret uintptr, err error)
//sys   munmap(addr uintptr, length uintptr) (err error)
//sysnb fork() (pid int, err error)
//sysnb execve(path *byte, argv **byte, envp **byte) (err error)
//sysnb exit(res int) (err error)
//sys	sysctl(mib []_C_int, old *byte, oldlen *uintptr, new *byte, newlen uintptr) (err error)