return
}

var ioSync int64

func CloseOnExec(fd int) { fcntl(fd, F_SETFD, FD_CLOEXEC) }

func SetNonblock(fd int, nonblocking bool) (err error) {
	flag, err := fcntl(fd, F_GETFL, 0)
	if err != nil {
		return err
	}
	if nonblocking {
		flag |= O_NONBLOCK
	} else {
		flag &= ^O_NONBLOCK
	}
	_, err = fcntl(fd, F_SETFL, flag)
	return err
}

//go:build zos && s390x

package unix

import (
	"runtime"
	"syscall"
	"unsafe"
)

var _ syscall.Errno

// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT

func fcntl(fd int, cmd int, arg int) (val int, err error) {
	runtime.EnterSyscall()
	r0, e2, e1 := CallLeFuncWithErr(GetZosLibVec()+SYS_FCNTL<<4, uintptr(fd), uintptr(cmd), uintptr(arg))
	runtime.ExitSyscall()
	val = int(r0)