package poll

import "syscall"

// Fsync wraps syscall.Fsync.
func (fd *FD) Fsync() error {
	if err := fd.incref(); err != nil {
		return err
	}
	defer fd.decref()
	return ignoringEINTR(func() error {
		return syscall.Fsync(fd.Sysfd)
	})

//sys	Fadvise(fd int, offset int64, length int64, advice int) (err error) = SYS_FADVISE64_64
//sys	Fchown(fd int, uid int, gid int) (err error) = SYS_FCHOWN32
//sys	Fstat(fd int, stat *Stat_t) (err error) = SYS_FSTAT64
//sys	Fstatat(dirfd int, path string, stat *Stat_t, flags int) (err error) = SYS_FSTATAT64
//sys	Ftruncate(fd int, length int64) (err error) = SYS_FTRUNCATE64

// IoctlSetInt performs an ioctl operation which sets an integer value
// on fd, using the specified request number.
func IoctlSetInt(fd int, req int, value int) error {
	return ioctl(fd, req, uintptr(value))
}

// IoctlSetWinsize performs an ioctl on fd with a *Winsize argument.
//
// To change fd's window size, the req argument should be TIOCSWINSZ.
func IoctlSetWinsize(fd int, req int, value *Winsize) error {

func SendtoInet6(fd int, p []byte, flags int, to *syscall.SockaddrInet6) (err error) {
	return syscall.ENOSYS
}

func SendmsgNInet4(fd int, p, oob []byte, to *syscall.SockaddrInet4, flags int) (n int, err error) {
	return 0, syscall.ENOSYS
}

func SendmsgNInet6(fd int, p, oob []byte, to *syscall.SockaddrInet6, flags int) (n int, err error) {
	return 0, syscall.ENOSYS
}

//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)

// on write calls.
//
//go:nowritebarrierrec
func write(fd uintptr, p unsafe.Pointer, n int32) int32 {
	if !(fd == 1 || fd == 2) {
		// Do an ordinary write.
		return write1(fd, p, n)
	}

	// Write with the playback header.

	// First, lock to avoid interleaving writes.
	lock(&faketimeState.lock)

	// If the current fd doesn't match the fd of the previous write,

}

func open(name string) (uintptr, error) {
	fd, err := syscall.Open(name, syscall.O_RDONLY)
	if err != nil {
		return 0, err
	}
	return uintptr(fd), nil
}

func read(fd uintptr, buf []byte) (int, error) {
	return syscall.Read(int(fd), buf)
}

func closefd(fd uintptr) {
	syscall.Close(int(fd))
}

func preadn(fd uintptr, buf []byte, off int) error {
	whence := seekStart
	if off < 0 {

//sys	Chroot(path string) (err error)
//sys	Close(fd int) (err error)
//sys	Dup(fd int) (nfd int, err error)
//sys	Dup2(from int, to int) (err error)
//sys	Fchdir(fd int) (err error)
//sys	Fchflags(fd int, flags int) (err error)
//sys	Fchmod(fd int, mode uint32) (err error)
//sys	Fchown(fd int, uid int, gid int) (err error)
//sys	Flock(fd int, how int) (err error)
//sys	Fpathconf(fd int, name int) (val int, err error)

	if err != nil {
		fmt.Printf("ReadAll from fd 3: %v\n", err)
		os.Exit(1)
	}

	// Now verify that there are no other open fds.
	// stdin == 0
	// stdout == 1
	// stderr == 2
	// descriptor from parent == 3
	// All descriptors 4 and up should be available,
	// except for any used by the network poller.
	for fd := uintptr(4); fd <= 100; fd++ {
		if poll.IsPollDescriptor(fd) {
			continue
		}

//sys	Fadvise(fd int, offset int64, length int64, advice int) (err error) = SYS_FADVISE64
//sys	Fchown(fd int, uid int, gid int) (err error)
//sys	Fstat(fd int, stat *Stat_t) (err error)
//sys	Fstatat(dirfd int, path string, stat *Stat_t, flags int) (err error) = SYS_NEWFSTATAT
//sys	Fstatfs(fd int, buf *Statfs_t) (err error)
//sys	Ftruncate(fd int, length int64) (err error)
//sysnb	Getegid() (egid int)