func setKeepAliveInterval(fd *netFD, d time.Duration) error {
	if d == 0 {
		d = defaultTCPKeepAliveInterval
	} else if d < 0 {
		return nil
	}

	// The kernel expects seconds so round to next highest second.
	secs := int(roundDurationUp(d, time.Second))
	err := fd.pfd.SetsockoptInt(syscall.IPPROTO_TCP, sysTCP_KEEPINTVL, secs)
	runtime.KeepAlive(fd)
	return wrapSyscallError("setsockopt", err)
}

package runtime

import (
	"unsafe"
)

func exit(code int32)

func write1(fd uintptr, p unsafe.Pointer, n int32) int32 {
	if fd > 2 {
		throw("runtime.write to fd > 2 is unsupported")
	}
	wasmWrite(fd, p, n)
	return n
}

//go:wasmimport gojs runtime.wasmWrite
//go:noescape
func wasmWrite(fd uintptr, p unsafe.Pointer, n int32)

func usleep(usec uint32) {
	// TODO(neelance): implement usleep
}

	if e1 != 0 {
		err = errnoErr(e1)
	}
	return
}

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

func Fstatfs(fd int, buf *Statfs_t) (err error) {
	_, _, e1 := Syscall(SYS_FSTATFS, uintptr(fd), uintptr(unsafe.Pointer(buf)), 0)
	if e1 != 0 {
		err = errnoErr(e1)
	}
	return
}

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

	SYS_READV          = 120 // { ssize_t sys_readv(int fd, \
	SYS_WRITEV         = 121 // { ssize_t sys_writev(int fd, \
	SYS_KILL           = 122 // { int sys_kill(int pid, int signum); }
	SYS_FCHOWN         = 123 // { int sys_fchown(int fd, uid_t uid, gid_t gid); }
	SYS_FCHMOD         = 124 // { int sys_fchmod(int fd, mode_t mode); }
	SYS_SETREUID       = 126 // { int sys_setreuid(uid_t ruid, uid_t euid); }

	runtime.KeepAlive(fd)
	return os.NewSyscallError("setsockopt", err)
}

func setKeepAliveCount(fd *netFD, n int) error {
	if n == 0 {
		n = defaultTCPKeepAliveCount
	} else if n < 0 {
		return nil
	}

	err := fd.pfd.SetsockoptInt(syscall.IPPROTO_TCP, windows.TCP_KEEPCNT, n)
	runtime.KeepAlive(fd)
	return os.NewSyscallError("setsockopt", err)
}

//sysnb	socket(domain int, typ int, proto int) (fd int, err error)
//sysnb	socketpair(domain int, typ int, proto int, fd *[2]int32) (err error)
//sysnb	getpeername(fd int, rsa *RawSockaddrAny, addrlen *_Socklen) (err error)
//sysnb	getsockname(fd int, rsa *RawSockaddrAny, addrlen *_Socklen) (err error)
//sys	recvfrom(fd int, p []byte, flags int, from *RawSockaddrAny, fromlen *_Socklen) (n int, err error)

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

func Dup(oldfd int, newfd int) (fd int, err error) {
	r0, _, e1 := Syscall(SYS_DUP, uintptr(oldfd), uintptr(newfd), 0)
	fd = int(r0)
	if int32(r0) == -1 {
		err = e1
	}
	return
}

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

func Pread(fd int, p []byte, offset int64) (n int, err error) {
	var _p0 unsafe.Pointer
	if len(p) > 0 {

			return err
		}
	}
	return sendto(fd, p, flags, ptr, salen)
}

func SetsockoptByte(fd, level, opt int, value byte) (err error) {
	return setsockopt(fd, level, opt, unsafe.Pointer(&value), 1)
}

func SetsockoptInt(fd, level, opt int, value int) (err error) {
	var n = int32(value)
	return setsockopt(fd, level, opt, unsafe.Pointer(&n), 4)
}

func SetsockoptInet4Addr(fd, level, opt int, value [4]byte) (err error) {

}

func Socketpair(domain, typ, proto int) (fd [2]int, err error) {
	var fdx [2]int32
	err = socketpair(domain, typ, proto, &fdx)
	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 {

	SYS_MKFIFOAT       = 319 // { int sys_mkfifoat(int fd, const char *path, mode_t mode); }
	SYS_MKNODAT        = 320 // { int sys_mknodat(int fd, const char *path, mode_t mode, dev_t dev); }
	SYS_OPENAT         = 321 // { int sys_openat(int fd, const char *path, int flags, ... mode_t mode); }