Re: Cannot bind an AF_UNIX socket with large filenames

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Hi Sam,

(Always worth CCing me as well as the list, if you want my attention
on a bug report.)
On Sat, Nov 29, 2008 at 9:34 AM, Sam Varshavchik <mrsam@xxxxxxxxxxxxxxx> wrote:
> It looks like the kernel -- at least 2.6.27.5 -- rejects with EINVAL a
> bind() of an AF_UNIX socket whose given size exceeds sizeof(struct
> sockaddr_un).
>
> Even if I make arrangements for a larger structure to accomodate a path that
> exceeds sockaddr_un's 107 bytes + \0, and I specify the actual size of the
> structure, bind() fails for me.
>
> I don't have the details, but I'm pretty sure other unixes accept domain
> sockets with larger filenames.

Are you sure of that?  Offhand, I don't know of such implementations,
but it's been a while since I tested this.  Which systems have you
seen this on?

> There, the sockaddr_un structure exists for
> historical reasons, and you can pretty much roll your own.
>
> This is perhaps worth mentioning in the description of EINVAL in unix(7).

I'm not (yet) convinced.

Cheers,

Michael


-- 
Michael Kerrisk
Linux man-pages maintainer; http://www.kernel.org/doc/man-pages/
git://git.kernel.org/pub/scm/docs/man-pages/man-pages.git
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