Does FreeBSD have sendmmsg or recvmmsg system calls?

[Konstantin Belousov]

On Tue, Jan 19, 2016 at 01:58:27PM +0200, Boris Astardzhiev wrote:
> +int
> +recvmmsg(int s, struct mmsghdr *msgvec, unsigned int vlen, int flags)
> +{
> +	int i, ret, rcvd;
Shouldn't i and rcvd be unsigned as well ?  Shouldn't return value
also be unsigned ?
> +
> +	if (vlen > VLEN_MAX)
> +		vlen = VLEN_MAX;
Why is this restriction needed ?

> +
> +	rcvd = 0;
> +	for (i = 0; i < vlen; i++) {
> +		errno = 0;
> +		ret = __sys_recvmsg(s, &msgvec[i].msg_hdr, flags);
> +		if (ret < 0 || errno != 0) {
I do not see why do you need to clear errno before, and then do this test.
Just check ret == -1, in which case errno was set from the immediate syscall.

> +			if (rcvd != 0) {
> +				/* We've received messages. Let caller know. */
> +				errno = 0;
This cleaning is not needed as well.  For successfull functions returns,
errno value is undefined.

> +				return (rcvd);
> +			}
> +			return (-1);
> +		}
> +
> +		/* Save received bytes */
> +		msgvec[i].msg_len = ret;
> +
Extra empty line.
> +		rcvd++;
> +	}
> +
> +	return (rcvd);
> +}