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-rw-r--r--Lib/asyncio/constants.py4
1 files changed, 4 insertions, 0 deletions
diff --git a/Lib/asyncio/constants.py b/Lib/asyncio/constants.py
index 739b0a70c1..d7ba496942 100644
--- a/Lib/asyncio/constants.py
+++ b/Lib/asyncio/constants.py
@@ -14,6 +14,10 @@ DEBUG_STACK_DEPTH = 10
# Number of seconds to wait for SSL handshake to complete
SSL_HANDSHAKE_TIMEOUT = 10.0
+# Used in sendfile fallback code. We use fallback for platforms
+# that don't support sendfile, or for TLS connections.
+SENDFILE_FALLBACK_READBUFFER_SIZE = 1024 * 256
+
# The enum should be here to break circular dependencies between
# base_events and sslproto
class _SendfileMode(enum.Enum):