STINNER Victor <vstin...@redhat.com> added the comment:

Oh, I found a test written by Nathaniel in trio source code and he wrote that 
"if SNDBUF = 0 freezes, so that's useless" :-)

https://github.com/python-trio/trio/blob/master/notes-to-self/socketpair-buffering.py

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<https://bugs.python.org/issue34130>
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