Function Nwrite

src/net.c:648–680

 */

int
Nwrite(int fd, const char *buf, size_t count, int prot)
{
    register ssize_t r;
    register size_t nleft = count;

    while (nleft > 0) {
	r = write(fd, buf, nleft);
	if (r < 0) {
	    switch (errno) {
		case EINTR:
		case EAGAIN:
#if (EAGAIN != EWOULDBLOCK)
                    /* XXX EWOULDBLOCK can't happen without non-blocking sockets */
		case EWOULDBLOCK:
#endif
		if (count == nleft)
		    return NET_SOFTERROR;
		return count - nleft;

                case ENOBUFS :
                return NET_SOFTERROR;

                default:
		return NET_HARDERROR;
	    }
	} else if (r == 0)
	    return NET_SOFTERROR;
	nleft -= r;
	buf += r;
    }
    return count;
}

#ifdef HAVE_UDP_SEGMENT
static void udp_msg_gso(struct cmsghdr *cm, uint16_t gso_size)