spray(3N) — NETWORK FUNCTIONS
NAME
spray − scatter data in order to check the network
SYNOPSIS
#include <rpcsvc/spray.h>
DESCRIPTION
The spray protocol sends packets to a given machine to test the speed and reliability of communications with that machine.
The spray protocol is not a C function interface, per se, but can be accessed using the generic remote procedure calling interface clnt_call() [see rpc_clnt_calls(3N)]. The protocol sends a packet to the called host. The host acknowledges receipt of the packet. The protocol counts the number of acknowledgments and can return that count.
The spray protocol currently supports the following procedures, which should be called in the order given:
SPRAYPROC_CLEAR
This procedure clears the counter.
SPRAYPROC_SPRAY
This procedure sends the packet.
SPRAYPROC_GET
This procedure returns the count and the amount of time since the last SPRAYPROC_CLEAR.
The following XDR routines are available in librpcsvc:
xdr_sprayarr
xdr_spraycumul
EXAMPLE
The following code fragment demonstrates how the spray protocol is used:
#include <rpc/rpc.h>
#include <rpcsvc/spray.h>
. . .
spraycumulspray_result;
sprayarrspray_data;
charbuf[100];/∗ arbitrary data ∗/
intloop = 1000;
CLIENT∗clnt;
struct timeval timeout0 = {0, 0};
struct timeval timeout25 = {25, 0};
spray_data.sprayarr_len = (u_int)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\n",
spray_result.counter,
spray_result.clock.sec,
spray_result.clock.usec);