create_subprocess_shell does not have the user parameter that asyncio has

• uvloop version: 0.20.0
• Python version: 3.12.3
• Platform: Ubuntu 24
• Can you reproduce the bug with PYTHONASYNCIODEBUG in env?: yes
• Does uvloop behave differently from vanilla asyncio? How?: yes

Below is a slightly modified minimal example from the stdlib, with the addition of the user parameter.
https://docs.python.org/3/library/asyncio-subprocess.html

It will work with asyncio, but the parameter is missing for uvloop in the corresponding method:
TypeError: __subprocess_run() got an unexpected keyword argument 'user'

import asyncio
import getpass

import uvloop


async def run(cmd, user: None | int | str = getpass.getuser()):
    proc = await asyncio.create_subprocess_shell(
        cmd,
        stdout=asyncio.subprocess.PIPE,
        stderr=asyncio.subprocess.PIPE,
        user=user,
    )

    stdout, stderr = await proc.communicate()

    print(f"[{cmd!r} exited with {proc.returncode}]")
    if stdout:
        print(f"[stdout]\n{stdout.decode()}")
    if stderr:
        print(f"[stderr]\n{stderr.decode()}")


asyncio.run(run("ls /tmp"))  # this works


uvloop.install()
asyncio.run(run("ls /tmp"))  # this errors

Could this be fixed/enhanced? This is very useful for scenarios where both changing the user and environment variables are required, since doing "su" to another user does not transfer the environment variables, and it then needs to be handled in a rather tedious way.

Thank you!

从 uvloop 的 create_subprocess_shell 实现入手，将其接受的参数与 Python asyncio subprocess 文档进行比较。在 uvloop 上复现所提供的示例，并确认 user 参数能够被接受，且其行为与 asyncio 一致，不会引发 unexpected-keyword TypeError。