// TimeToTimespec converts t into a Timespec.
// On some 32-bit systems the range of valid Timespec values are smaller
// than that of time.Time values.  So if t is out of the valid range of
// Timespec, it returns a zero Timespec and ERANGE.
func TimeToTimespec(t time.Time) (Timespec, error) {
	sec := t.Unix()
	nsec := int64(t.Nanosecond())
	ts := setTimespec(sec, nsec)

	// Currently all targets have either int32 or int64 for Timespec.Sec.

// or the buffer exceeds a reasonable limit.
func retryWithBuffer(kind bufferKind, f func([]byte) syscall.Errno) error {
	buf := make([]byte, kind.initialSize())
	for {
		errno := f(buf)
		if errno == 0 {
			return nil
		} else if runtime.GOOS == "aix" && errno+1 == 0 {
			// On AIX getpwuid_r appears to return -1,
			// not ERANGE, on buffer overflow.

	EPIPE           = syscall.Errno(0x20)
	EPROCLIM        = syscall.Errno(0x53)
	EPROTO          = syscall.Errno(0x79)
	EPROTONOSUPPORT = syscall.Errno(0x3e)
	EPROTOTYPE      = syscall.Errno(0x3c)
	ERANGE          = syscall.Errno(0x22)
	EREMOTE         = syscall.Errno(0x5d)
	ERESTART        = syscall.Errno(0x52)
	EROFS           = syscall.Errno(0x1e)
	ESAD            = syscall.Errno(0x71)

	// dynamically-sized buffer at this point.
	const maxCPUs = 64 * 1024
	var mask [maxCPUs / 8]byte
	var mib [_CTL_MAXNAME]uint32

	// According to FreeBSD's /usr/src/sys/kern/kern_cpuset.c,
	// cpuset_getaffinity return ERANGE when provided buffer size exceed the limits in kernel.
	// Querying kern.smp.maxcpus to calculate maximum buffer size.
	// See https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=200802

	EPFNOSUPPORT    = syscall.Errno(0x7b)
	EPIPE           = syscall.Errno(0x20)
	EPROTO          = syscall.Errno(0x47)
	EPROTONOSUPPORT = syscall.Errno(0x78)
	EPROTOTYPE      = syscall.Errno(0x62)
	ERANGE          = syscall.Errno(0x22)
	EREMCHG         = syscall.Errno(0x52)
	EREMOTE         = syscall.Errno(0x42)
	ERESTART        = syscall.Errno(0x5b)
	EROFS           = syscall.Errno(0x1e)

	EPIPE           = syscall.Errno(0x20)
	EPROCLIM        = syscall.Errno(0x53)
	EPROTO          = syscall.Errno(0x79)
	EPROTONOSUPPORT = syscall.Errno(0x3e)
	EPROTOTYPE      = syscall.Errno(0x3c)
	ERANGE          = syscall.Errno(0x22)
	EREMOTE         = syscall.Errno(0x5d)
	ERESTART        = syscall.Errno(0x52)
	EROFS           = syscall.Errno(0x1e)
	ESAD            = syscall.Errno(0x71)

	EPROTO          = syscall.Errno(0x64)
	EPROTONOSUPPORT = syscall.Errno(0x2b)
	EPROTOTYPE      = syscall.Errno(0x29)
	EPWROFF         = syscall.Errno(0x52)
	EQFULL          = syscall.Errno(0x6a)
	ERANGE          = syscall.Errno(0x22)
	EREMOTE         = syscall.Errno(0x47)
	EROFS           = syscall.Errno(0x1e)
	ERPCMISMATCH    = syscall.Errno(0x49)
	ESHLIBVERS      = syscall.Errno(0x57)

	EPROGMISMATCH   = syscall.Errno(0x4b)
	EPROGUNAVAIL    = syscall.Errno(0x4a)
	EPROTO          = syscall.Errno(0x5f)
	EPROTONOSUPPORT = syscall.Errno(0x2b)
	EPROTOTYPE      = syscall.Errno(0x29)
	ERANGE          = syscall.Errno(0x22)
	EREMOTE         = syscall.Errno(0x47)
	EROFS           = syscall.Errno(0x1e)
	ERPCMISMATCH    = syscall.Errno(0x49)
	ESHUTDOWN       = syscall.Errno(0x3a)

	EPROGMISMATCH   = syscall.Errno(0x4b)
	EPROGUNAVAIL    = syscall.Errno(0x4a)
	EPROTO          = syscall.Errno(0x60)
	EPROTONOSUPPORT = syscall.Errno(0x2b)
	EPROTOTYPE      = syscall.Errno(0x29)
	ERANGE          = syscall.Errno(0x22)
	EREMOTE         = syscall.Errno(0x47)
	EROFS           = syscall.Errno(0x1e)
	ERPCMISMATCH    = syscall.Errno(0x49)
	ESHUTDOWN       = syscall.Errno(0x3a)

	EPROGMISMATCH   = syscall.Errno(0x4b)
	EPROGUNAVAIL    = syscall.Errno(0x4a)
	EPROTO          = syscall.Errno(0x5c)
	EPROTONOSUPPORT = syscall.Errno(0x2b)
	EPROTOTYPE      = syscall.Errno(0x29)
	ERANGE          = syscall.Errno(0x22)
	EREMOTE         = syscall.Errno(0x47)
	EROFS           = syscall.Errno(0x1e)
	ERPCMISMATCH    = syscall.Errno(0x49)
	ESHUTDOWN       = syscall.Errno(0x3a)