Re: [PATCH] convert udevsend/udevd to DGRAM and single-threaded

[Patrick Mansfield <patmans@us.ibm.com>]

On Sat, Feb 07, 2004 at 02:06:25AM -0500, Chris Friesen wrote:
> Patrick Mansfield wrote:
> 
> > I mean, SOCK_DGRAM is an unreliable transport, so what happens if the
> > transport drops packets? It might be unlikely, especially for the AF_LOCAL,
> > but it is possible.
> > 
> > I don't see any ack or retransmit code in udevsend.
> 
> Unix sockets are basically reliable.  Barring something really wierd going on, 
> if the server is present, a blocking sendto() (with valid parameters, of course) 
> will succeed eventually, which guarantees that the message was queued up in the 
> server's receive buffer.  If the server is not present, then you get an errno of 
> ECONNREFUSED, and you know to start the server.
> 
>  From the man page: "Unix sockets are always reliable and don't reorder datagrams."

OK, thanks for the explanations, I did not know about the "man unix" ;-)

-- Patrick Mansfield


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