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-rw-r--r--Lib/test/support/__init__.py10
1 files changed, 8 insertions, 2 deletions
diff --git a/Lib/test/support/__init__.py b/Lib/test/support/__init__.py
index 9f378fd..956fe98 100644
--- a/Lib/test/support/__init__.py
+++ b/Lib/test/support/__init__.py
@@ -603,8 +603,14 @@ IPV6_ENABLED = _is_ipv6_enabled()
# Windows limit seems to be around 512 B, and many Unix kernels have a
# 64 KiB pipe buffer size or 16 * PAGE_SIZE: take a few megs to be sure.
# (see issue #17835 for a discussion of this number).
-PIPE_MAX_SIZE = 4 *1024 * 1024 + 1
-
+PIPE_MAX_SIZE = 4 * 1024 * 1024 + 1
+
+# A constant likely larger than the underlying OS socket buffer size, to make
+# writes blocking.
+# The socket buffer sizes can usually be tuned system-wide (e.g. through sysctl
+# on Linux), or on a per-socket basis (SO_SNDBUF/SO_RCVBUF). See issue #18643
+# for a discussion of this number).
+SOCK_MAX_SIZE = 16 * 1024 * 1024 + 1
# decorator for skipping tests on non-IEEE 754 platforms
requires_IEEE_754 = unittest.skipUnless(