RE: Timeout parameters

From: Kyotaro HORIGUCHI [mailto:horiguchi.kyotaro@lab.ntt.co.jp]
> +    if (setsockopt(conn->sock, IPPROTO_TCP, TCP_USER_TIMEOUT,
> +             (char *) &timeout, sizeof(timeout)) < 0 && errno !=
> ENOPROTOOPT)
> +    {
> +        char        sebuf[256];
> +
> +        appendPQExpBuffer(&conn->errorMessage,
> +                    libpq_gettext("setsockopt(TCP_USER_TIMEOUT)
> failed: %s\n"),
> 
> I suppose that the reason ENOPROTOOPT is excluded from error
> condition is that the system call may fail with that errno on
> older kernels, but I don't think that that justifies ignoring the
> failure.

I think that's for the case where the modules is built on an OS that supports TCP_USER_TIMEOUT (#ifdef TCP_USER_TIMEOUT
istrue), and the module is used on an older OS that doesn't support TCP_USER_TIMEOUT.  I remember I was sometimes able
todo such a thing on Linux and Solaris.  If we don't have to handle such usage, I agree about removing the special
handlingof ENOTPROTO.
 


Regards
Takayuki Tsunakawa