>> There is no nonportability here unless they care about portability
>> across the silent API change (which is unlikely) or unless Linux
>> does it gratuitously differently (which is reasonably likely,
>> actually).
> The struct msghdr and function arguments are identical.  However,
> OpenVPN does use a flag not defined in NetBSD:

> MSG_NOSIGNAL
>  	Requests not to send SIGPIPE on errors on stream oriented
>  	sockets when the other end breaks the connection.  The EPIPE
>  	error is still returned.

> That doesn't look like a showstopper...

Depends on how OpenVPN uses it.  But, looking at the code for SIGPIPE
generation, it looks as though this would be dead easy to add to
NetBSD.  sendit(), in uipc_syscalls.c, is the only place that I think
needs to be touched:

-                if (error == EPIPE)
-                        psignal(p, SIGPIPE);
+                if ((error == EPIPE) && !(flags & MSG_NOSIGNAL))
+                        psignal(p, SIGPIPE);

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