Re: minimum write size of SOCK_STREAM?

[RVP <rvp%SDF.ORG@localhost>]

On Thu, 30 Oct 2025, Andrew Cagney wrote:

> I've what I thought was some stock (if somewhat old) code that used a
> SOCK_STREAM for communication between a daemon and its control
> program.

What domain? AF_LOCAL or AF_INET{,6}?

> Because the messages were all below the socket's buffer size (8K
> according to getsockopt()), my understanding is partial reads
> shouldn't happen.

With SOCK_STREAM, partial reads can always happen. If you want whole-packet
reads (< MTU size) you'll have to use SOCK_DGRAM or SOCK_SEQPACKET; or send
the message size too, so that the server can loop until it gets the whole
packet.

Let's see your code.

-RVP