Re: Will AF_UNIX drop packets ever?

From: H. Peter Anvin (
Date: Wed Mar 05 2003 - 17:24:52 EST

David S. Miller wrote:
> From: "H. Peter Anvin" <>
> Date: 5 Mar 2003 13:24:58 -0800
> Question... I have heard conflicting info if (AF_UNIX, SOCK_DGRAM)
> sockets will drop packets or not. I would appreciate a conclusive
> answer for the Linux kernel specifically. Alternatively, is (AF_UNIX,
> SOCK_SEQPACKET) implemented in Linux?
> If sendmsg returns no errors, we reliably send the data and
> do not drop it.

Cool. I needed an IPC which preserve record boundaries, and it just
seems pointless to encapsulate the packets into a stream just to have
them unencapsulated at the end -- especially since it means the read
needs multiple system calls.

> We don't have AF_UNIX/SEQPACKET, but we do have AF_UNIX/STREAM.

Right, of course.



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