[New-bugs-announce] [issue24933] socket.recv(size, MSG_TRUNC) returns more than size bytes

[Andrey Wagin]

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?

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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 <report at bugs.python.org>
<http://bugs.python.org/issue24933>
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