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#
# SPDX-FileCopyrightText: 2016 - 2026 Dimitri Staessens
# SPDX-License-Identifier: LGPL-2.1-only
#
"""
Shared float-seconds <-> ``struct timespec *`` conversions.
The caller passes its own ``ffi`` instance so the returned CData is
bound to the right CFFI extension module.
"""
from __future__ import annotations
from math import modf
from typing import TYPE_CHECKING, Any, Optional
if TYPE_CHECKING:
from cffi import FFI
BILLION = 1000 * 1000 * 1000
def fl_to_timespec(ffi: FFI, timeo: Optional[float]) -> Any:
"""
Convert *timeo* (seconds, or None) to a ``struct timespec *``.
*None* yields ``ffi.NULL`` (block forever). A non-positive *timeo*
yields a zeroed timespec (async / poll).
"""
if timeo is None:
return ffi.NULL
if timeo <= 0:
return ffi.new("struct timespec *", [0, 0])
frac, whole = modf(timeo)
_timeo = ffi.new("struct timespec *")
_timeo.tv_sec = int(whole)
_timeo.tv_nsec = int(frac * BILLION)
return _timeo
def timespec_to_fl(ffi: FFI, _timeo: Any) -> Optional[float]:
"""
Convert a ``struct timespec *`` to seconds-as-float.
``ffi.NULL`` yields *None* (block forever).
"""
if _timeo == ffi.NULL:
return None
if _timeo.tv_sec <= 0 and _timeo.tv_nsec == 0:
return 0.0
return _timeo.tv_sec + _timeo.tv_nsec / BILLION
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