From 9da626701289791690490b2272b25e1f4f0e1db0 Mon Sep 17 00:00:00 2001
From: leojay <130761+leojay@users.noreply.github.com>
Date: Mon, 19 Oct 2020 14:01:44 -0700
Subject: [PATCH] Fix a crash in pypy.

Apparently, in pypy, "signal.set_wakeup_fd" doesn't have the keyword argument warn_on_full_buffer.

Here is a simple script to reproduce this problem:
import trio

async def handler(stream: trio.abc.Stream):
    await stream.receive_some(1)

async def trio_main():
    socket_listeners = await trio.serve_tcp(handler)

trio.run(trio_main)
---
 trio/_core/_wakeup_socketpair.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/trio/_core/_wakeup_socketpair.py b/trio/_core/_wakeup_socketpair.py
index 86eaeb6355..d78b1a506b 100644
--- a/trio/_core/_wakeup_socketpair.py
+++ b/trio/_core/_wakeup_socketpair.py
@@ -6,7 +6,7 @@
 from .. import _core
 from .._util import is_main_thread
 
-if sys.version_info >= (3, 7):
+if sys.version_info >= (3, 7) and '__pypy__' not in sys.builtin_module_names:
     HAVE_WARN_ON_FULL_BUFFER = True
 else:
     HAVE_WARN_ON_FULL_BUFFER = False