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Re: [rdiff-backup-users] Socket error: AF_UNIX path too long


From: devzero
Subject: Re: [rdiff-backup-users] Socket error: AF_UNIX path too long
Date: Sat, 13 May 2006 23:00:58 +0200

>so you can't create a UNIX domain socket if the entire path is longer
>than 104 characters - trailing null = 103 characters.

errrrrrrrrr - what? :D

> rdiff-backup must be copying these files to a path with a prefix  
> longer than 79 characters. I don't know why it'd be doing so on this  
> day but not others, but I'm not familiar with its internal format.

no - my prefix is definetely shorter than 79 chars

roland


> -----Urspr√ľngliche Nachricht-----
> Von: Scott Lamb <address@hidden>
> Gesendet: 13.05.06 21:28:04
> An: address@hidden
> CC: address@hidden
> Betreff: Re: [rdiff-backup-users] Socket error: AF_UNIX path too long


> On May 13, 2006, at 4:31 AM, address@hidden wrote:
> > $ zcat error_log.2006-04-29T02\:18\:43+02\:00.data.gz
> > SpecialFileError var/lib/mysql/mysql.sock AF_UNIX path too long
> > SpecialFileError var/run/authdaemon.courier-imap/socket Socket  
> > error: AF_UNIX path too long
> >
> > does anybody have a clue, what this means and why this only  
> > happened on april 29 ?
> 
> I can answer the first half of your question:
> 
> /*
>   * [XSI] Definitions for UNIX IPC domain.
>   */
> struct  sockaddr_un {
>          unsigned char   sun_len;        /* sockaddr len including  
> null */
>          sa_family_t     sun_family;     /* [XSI] AF_UNIX */
>          char            sun_path[104];  /* [XSI] path name (gag) */
> };
> 
> <http://svn.python.org/view/python/trunk/Modules/socketmodule.c? 
> view=log> in getsockaddrarg:
> 
>                          if (len >= sizeof addr->sun_path) {
>                                  PyErr_SetString(socket_error,
>                                                  "AF_UNIX path too  
> long");
>                                  return 0;
>                          }
> 
> so you can't create a UNIX domain socket if the entire path is longer  
> than 104 characters - trailing null = 103 characters.
> 
> I'm not sure if the OS would accept a longer one if you allocated a  
> larger memory region and set sun_len appropriately, but you  
> definitely can't do it with a current version of Python.
> 
> rdiff-backup must be copying these files to a path with a prefix  
> longer than 79 characters. I don't know why it'd be doing so on this  
> day but not others, but I'm not familiar with its internal format.
> 
> -- 
> Scott Lamb <http://www.slamb.org/>
> 
> 


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