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from abc import abstractmethod
from signal import Signals
from typing import Optional
from ._resources import AsyncResource
from ._streams import ByteReceiveStream, ByteSendStream
class Process(AsyncResource):
"""An asynchronous version of :class:`subprocess.Popen`."""
@abstractmethod
async def wait(self) -> int:
"""
Wait until the process exits.
:return: the exit code of the process
"""
@abstractmethod
def terminate(self) -> None:
"""
Terminates the process, gracefully if possible.
On Windows, this calls ``TerminateProcess()``.
On POSIX systems, this sends ``SIGTERM`` to the process.
.. seealso:: :meth:`subprocess.Popen.terminate`
"""
@abstractmethod
def kill(self) -> None:
"""
Kills the process.
On Windows, this calls ``TerminateProcess()``.
On POSIX systems, this sends ``SIGKILL`` to the process.
.. seealso:: :meth:`subprocess.Popen.kill`
"""
@abstractmethod
def send_signal(self, signal: Signals) -> None:
"""
Send a signal to the subprocess.
.. seealso:: :meth:`subprocess.Popen.send_signal`
:param signal: the signal number (e.g. :data:`signal.SIGHUP`)
"""
@property
@abstractmethod
def pid(self) -> int:
"""The process ID of the process."""
@property
@abstractmethod
def returncode(self) -> Optional[int]:
"""
The return code of the process. If the process has not yet terminated, this will be
``None``.
"""
@property
@abstractmethod
def stdin(self) -> Optional[ByteSendStream]:
"""The stream for the standard input of the process."""
@property
@abstractmethod
def stdout(self) -> Optional[ByteReceiveStream]:
"""The stream for the standard output of the process."""
@property
@abstractmethod
def stderr(self) -> Optional[ByteReceiveStream]:
"""The stream for the standard error output of the process."""