// 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.

	EOVERFLOW       Errno = 61
	EOWNERDEAD      Errno = 62
	EPERM           Errno = 63
	EPIPE           Errno = 64
	EPROTO          Errno = 65
	EPROTONOSUPPORT Errno = 66
	EPROTOTYPE      Errno = 67
	ERANGE          Errno = 68
	EROFS           Errno = 69
	ESPIPE          Errno = 70
	ESRCH           Errno = 71
	ESTALE          Errno = 72
	ETIMEDOUT       Errno = 73
	ETXTBSY         Errno = 74
	EXDEV           Errno = 75

	ENOTRECOVERABLE
	ENOTSOCK
	ENOTSUP
	ENOTTY
	ENOTUNIQ
	ENXIO
	EOPNOTSUPP
	EOVERFLOW
	EOWNERDEAD
	EPERM
	EPFNOSUPPORT
	EPIPE
	EPROTO
	EPROTONOSUPPORT
	EPROTOTYPE
	ERANGE
	EREMCHG
	EREMOTE
	EREMOTEIO
	ERESTART
	EROFS
	ESHUTDOWN
	ESOCKTNOSUPPORT
	ESPIPE
	ESRCH
	ESRMNT
	ESTALE
	ESTRPIPE
	ETIME
	ETIMEDOUT
	ETOOMANYREFS
	ETXTBSY

	"EROFS":           EROFS,
	"EMLINK":          EMLINK,
	"EPIPE":           EPIPE,
	"ENAMETOOLONG":    ENAMETOOLONG,
	"ENOSYS":          ENOSYS,
	"EDQUOT":          EDQUOT,
	"EDOM":            EDOM,
	"ERANGE":          ERANGE,
	"EDEADLK":         EDEADLK,
	"ENOLCK":          ENOLCK,
	"ENOTEMPTY":       ENOTEMPTY,
	"ELOOP":           ELOOP,
	"ENOMSG":          ENOMSG,
	"EIDRM":           EIDRM,
	"ECHRNG":          ECHRNG,

	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)