te
Copyright 1989 AT&T Copyright (c) 1997, Sun Microsystems, Inc. All Rights Reserved
The contents of this file are subject to the terms of the Common Development and Distribution License (the "License"). You may not use this file except in compliance with the License.
You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE or http://www.opensolaris.org/os/licensing. See the License for the specific language governing permissions and limitations under the License.
When distributing Covered Code, include this CDDL HEADER in each file and include the License file at usr/src/OPENSOLARIS.LICENSE. If applicable, add the following below this CDDL HEADER, with the fields enclosed by brackets "[]" replaced with your own identifying information: Portions Copyright [yyyy] [name of copyright owner]
spray - scatter data in order to test the network

cc [ flag ... ] file ... -lsocket  -lnsl  [ library ... ]
#include <rpcsvc/spray.h>

bool_t xdr_sprayarr(XDR *xdrs, sprayarr *objp);

bool_t xdr_spraycumul(XDR *xdrs, spraycumul *objp);

The spray program sends packets to a given machine to test communications with that machine.

The spray program is not a C function interface, per se, but it can be accessed using the generic remote procedure calling interface clnt_call(). See rpc_clnt_calls(3NSL). The program sends a packet to the called host. The host acknowledges receipt of the packet. The program counts the number of acknowledgments and can return that count.

The spray program currently supports the following procedures, which should be called in the order given: SPRAYPROC_CLEAR

SPRAYPROC_SPRAY SPRAYPROC_GET

Example 1 Using spray()

The following code fragment demonstrates how the spray program is used:

#include <rpc/rpc.h>
#include <rpcsvc/spray.h>
 . . .
 spraycumul spray_result;
 sprayarr spray_data;
 char buf[100]; /* arbitrary data */
 int loop = 1000;
 CLIENT *clnt;
 struct timeval timeout0 = {0, 0};
 struct timeval timeout25 = {25, 0};
 spray_data.sprayarr_len = (uint_t)100;
 spray_data.sprayarr_val = buf;
 clnt = clnt_create("somehost", SPRAYPROG, SPRAYVERS, "netpath");
 if (clnt == (CLIENT *)NULL) {
 /* handle this error */
 }
 if (clnt_call(clnt, SPRAYPROC_CLEAR,
 xdr_void, NULL, xdr_void, NULL, timeout25)) {
 /* handle this error */
 }
 while (loop- > 0) {
 if (clnt_call(clnt, SPRAYPROC_SPRAY,
 xdr_sprayarr, &spray_data, xdr_void, NULL, timeout0)) {
 /* handle this error */
 }
 }
 if (clnt_call(clnt, SPRAYPROC_GET,
 xdr_void, NULL, xdr_spraycumul, &spray_result, timeout25)) {
 /* handle this error */
 }
 printf("Acknowledged %ld of 1000 packets in %d secs %d usecs\en",
 spray_result.counter,
 spray_result.clock.sec,
 spray_result.clock.usec);

See attributes(5) for descriptions of the following attributes:

ATTRIBUTE TYPE ATTRIBUTE VALUE

MT-Level Unsafe

spray(1M), rpc_clnt_calls(3NSL), attributes(5)

This interface is unsafe in multithreaded applications. Unsafe interfaces should be called only from the main thread.

A spray program is not useful as a networking benchmark as it uses unreliable connectionless transports, for example, udp. It can report a large number of packets dropped, when the drops were caused by the program sending packets faster than they can be buffered locally, that is, before the packets get to the network medium.