}

//go:nosplit
func fcntl(fd, cmd, arg int32) (int32, int32) {
	r, errno := syscall3(&libc_fcntl, uintptr(fd), uintptr(cmd), uintptr(arg))
	return int32(r), int32(errno)
}

//go:nosplit
func setNonblock(fd int32) {
	flags, _ := fcntl(fd, _F_GETFL, 0)
	if flags != -1 {
		fcntl(fd, _F_SETFL, flags|_O_NONBLOCK)
	}
}

// sigPerThreadSyscall is only used on linux, so we assign a bogus signal
// number.

		// non-blocking mode.
		if nonBlocking {
			// See the comments on net_newUnixFile.
			if kind == kindSock {
				f.nonblock = true // tell Fd to return blocking descriptor
			}
		} else if err := syscall.SetNonblock(fd, true); err == nil {
			f.nonblock = true
			clearNonBlock = true
		} else {
			pollable = false
		}
	}

	// An error here indicates a failure to register

	n = 0
	for i, s := range ss {
		bb[i] = &b[n]
		copy(b[n:], s)
		n += len(s) + 1
	}
	return bb, nil
}

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 (flag&O_NONBLOCK != 0) == nonblocking {
		return nil
	}
	if nonblocking {

	clockProcessCPUTimeID
	clockThreadCPUTimeID
)

//go:wasmimport wasi_snapshot_preview1 clock_time_get
//go:noescape
func clock_time_get(id clockid, precision timestamp, time unsafe.Pointer) Errno

func SetNonblock(fd int, nonblocking bool) error {
	flags, err := fd_fdstat_get_flags(fd)
	if err != nil {
		return err
	}
	if nonblocking {
		flags |= FDFLAG_NONBLOCK
	} else {
		flags &^= FDFLAG_NONBLOCK
	}

		}
		b = utf16.AppendRune(b, 0)
	}
	b = utf16.AppendRune(b, 0)
	return b, nil
}

func CloseOnExec(fd Handle) {
	SetHandleInformation(Handle(fd), HANDLE_FLAG_INHERIT, 0)
}

func SetNonblock(fd Handle, nonblocking bool) (err error) {
	return nil
}

// FullPath retrieves the full path of the specified file.
func FullPath(name string) (path string, err error) {
	p, err := UTF16PtrFromString(name)

	// buffer is somehow full we will not block in the signal handler.
	// Leave the read end of the pipe blocking so that we will block
	// in sigNoteSleep.
	setNonblock(sigNoteWrite)
}

// sigNoteWakeup wakes up a thread sleeping on a note created by sigNoteSetup.
func sigNoteWakeup(*note) {
	var b byte
	write(uintptr(sigNoteWrite), unsafe.Pointer(&b), 1)
}

	if err == nil {
		fd[0] = int(fdx[0])
		fd[1] = int(fdx[1])
	}
	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 (flag&O_NONBLOCK != 0) == nonblocking {
		return nil
	}
	if nonblocking {

	// Atomic store so that concurrent calls to SetBlocking
	// do not cause a race condition. isBlocking only ever goes
	// from 0 to 1 so there is no real race here.
	atomic.StoreUint32(&fd.isBlocking, 1)
	return syscall.SetNonblock(fd.Sysfd, false)
}

// Darwin and FreeBSD can't read or write 2GB+ files at a time,
// even on 64-bit systems.
// The same is true of socket implementations on many systems.

	return ret
}
func pthread_cond_signal_trampoline()

// Not used on Darwin, but must be defined.
func exitThread(wait *atomic.Uint32) {
	throw("exitThread")
}

//go:nosplit
func setNonblock(fd int32) {
	flags, _ := fcntl(fd, _F_GETFL, 0)
	if flags != -1 {
		fcntl(fd, _F_SETFL, flags|_O_NONBLOCK)
	}
}

func issetugid() int32 {

	if err == nil {
		fd[0] = int(fdx[0])
		fd[1] = int(fdx[1])
	}
	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
	}