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Fix child process kill error with npx based servers by surya-prakash-susarla · Pull Request #850 · modelcontextprotocol/python-sdk · GitHub

/ python-sdk Public

Fix child process kill error with npx based servers #850

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Fix child process kill error with npx based servers #850

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10 changes: 9 additions & 1 deletion src/mcp/client/stdio/__init__.py
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Original file line number Diff line number Diff line change
@@ -1,4 +1,5 @@
import os
import signal
import sys
from contextlib import asynccontextmanager
from pathlib import Path
Expand Down Expand Up @@ -190,6 +191,13 @@ async def stdin_writer():
await terminate_windows_process(process)
else:
process.terminate()

try:
with anyio.fail_after(5):
await process.wait()
except TimeoutError:
pgid = os.getpgid(process.pid)
os.killpg(pgid, signal.SIGKILL)
except ProcessLookupError:
# Process already exited, which is fine
pass
Expand Down Expand Up @@ -230,7 +238,7 @@ async def _create_platform_compatible_process(
process = await create_windows_process(command, args, env, errlog, cwd)
else:
process = await anyio.open_process(
[command, *args], env=env, stderr=errlog, cwd=cwd
[command, *args], env=env, stderr=errlog, cwd=cwd, start_new_session=True
)

return process
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