linux-kernel - Re: Stray nulls when reading from AF

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Date:	Thu, 6 Sep 2007 09:09:50 -0700
From:	Randy Dunlap <randy.dunlap@...cle.com>
To:	Anders Blomdell <anders.blomdell@...trol.lth.se>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: Stray nulls when reading from AF_UNIX sockets

On Thu, 06 Sep 2007 17:48:07 +0200 Anders Blomdell wrote:

> Hi,
> 
> With recent kernels (2.6.22.x), we are experiencing that random null characters
> are read by  our mySQL server (i.e. the number of bytes read by the server is
> larger than the number of bytes written). I'm currently investigating the
> problem (that occurs every 1-35 hours on a loaded system). A current suspect is
> the following code in  net/unix/af_unix.c:
> 
>   static int unix_stream_recvmsg(struct kiocb *iocb, struct socket *sock,
>                                  struct msghdr *msg, size_t size,
>                                  int flags)
>   {
>     ...
>     return copied ? : err;
>   }
> 
> Shouldn't this read:
> 
>     return copied ? copied : err;
> 
> Or am I missing something?
> 
> Please CC me personally.

It's (?:) a gcc extension.  See

http://gcc.gnu.org/onlinedocs/gcc-4.2.1/gcc/Conditionals.html#Conditionals

---
~Randy
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