New submission from Andrey Wagin:
In [1]: import socket
In [2]: sks = socket.socketpair(socket.AF_UNIX, socket.SOCK_DGRAM)
In [3]: sks[1].send("asdfasdfsadfasdfsdfsadfsdfasdfsdfasdfsadfa")
Out[3]: 42
In [4]: sks[0].recv(1, socket.MSG_PEEK | socket.MSG_TRUNC)
Out[4]:
'a\x00\x00\x00\xc0\xbf8\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
recv() returns a buffer. The size of this buffer is equal to the size of
transferred data, but only the first symbol was initialized. What is the idea
of this behavior.
Usually recv(sk, NULL, 0, socket.MSG_PEEK | socket.MSG_TRUNC) is used to get a
message size. What is the right way to get a message size in Python?
----------
components: Library (Lib)
messages: 249114
nosy: Andrey Wagin
priority: normal
severity: normal
status: open
title: socket.recv(size, MSG_TRUNC) returns more than size bytes
versions: Python 2.7
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Python tracker <[email protected]>
<http://bugs.python.org/issue24933>
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