1 '\" te
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6 .TH SPRAY 3SOCKET "Dec 30, 1996"
7 .SH NAME
8 spray \- scatter data in order to test the network
9 .SH SYNOPSIS
10 .LP
11 .nf
12 \fBcc\fR [ \fIflag\fR ... ] \fIfile\fR ... \fB-lsocket\fR \fB -lnsl \fR [ \fIlibrary\fR ... ]
13 #include <rpcsvc/spray.h>
14
15 \fBbool_t\fR \fBxdr_sprayarr\fR(\fBXDR *\fR\fIxdrs\fR, \fBsprayarr *\fR\fIobjp\fR);
16 .fi
17
18 .LP
19 .nf
20 \fBbool_t\fR \fBxdr_spraycumul\fR(\fBXDR *\fR\fIxdrs\fR, \fBspraycumul *\fR\fIobjp\fR);
21 .fi
22
23 .SH DESCRIPTION
24 .sp
25 .LP
26 The spray program sends packets to a given machine to test communications with
27 that machine.
28 .sp
29 .LP
30 The spray program is not a C function interface, per se, but it can be accessed
31 using the generic remote procedure calling interface \fBclnt_call()\fR. See
32 \fBrpc_clnt_calls\fR(3NSL). The program sends a packet to the called host. The
33 host acknowledges receipt of the packet. The program counts the number of
34 acknowledgments and can return that count.
35 .sp
36 .LP
37 The spray program currently supports the following procedures, which should be
38 called in the order given:
39 .sp
40 .ne 2
41 .na
42 \fB\fBSPRAYPROC_CLEAR\fR\fR
43 .ad
44 .RS 19n
45 This procedure clears the counter.
46 .RE
47
48 .sp
49 .ne 2
50 .na
51 \fB\fBSPRAYPROC_SPRAY\fR\fR
52 .ad
53 .RS 19n
54 This procedure sends the packet.
55 .RE
56
57 .sp
58 .ne 2
59 .na
60 \fB\fBSPRAYPROC_GET\fR\fR
61 .ad
62 .RS 19n
63 This procedure returns the count and the amount of time since the last
64 \fBSPRAYPROC_CLEAR\fR.
65 .RE
66
67 .SH EXAMPLES
68 .LP
69 \fBExample 1 \fRUsing \fBspray()\fR
70 .sp
71 .LP
72 The following code fragment demonstrates how the spray program is used:
73
74 .sp
75 .in +2
76 .nf
77 #include <rpc/rpc.h>
78 #include <rpcsvc/spray.h>
79 . . .
80 spraycumul spray_result;
81 sprayarr spray_data;
82 char buf[100]; /* arbitrary data */
83 int loop = 1000;
84 CLIENT *clnt;
85 struct timeval timeout0 = {0, 0};
86 struct timeval timeout25 = {25, 0};
87 spray_data.sprayarr_len = (uint_t)100;
88 spray_data.sprayarr_val = buf;
89 clnt = clnt_create("somehost", SPRAYPROG, SPRAYVERS, "netpath");
90 if (clnt == (CLIENT *)NULL) {
91 /* handle this error */
92 }
93 if (clnt_call(clnt, SPRAYPROC_CLEAR,
94 xdr_void, NULL, xdr_void, NULL, timeout25)) {
95 /* handle this error */
96 }
97 while (loop\(mi > 0) {
98 if (clnt_call(clnt, SPRAYPROC_SPRAY,
99 xdr_sprayarr, &spray_data, xdr_void, NULL, timeout0)) {
100 /* handle this error */
101 }
102 }
103 if (clnt_call(clnt, SPRAYPROC_GET,
104 xdr_void, NULL, xdr_spraycumul, &spray_result, timeout25)) {
105 /* handle this error */
106 }
107 printf("Acknowledged %ld of 1000 packets in %d secs %d usecs\en",
108 spray_result.counter,
109 spray_result.clock.sec,
110 spray_result.clock.usec);
111 .fi
112 .in -2
113
114 .SH ATTRIBUTES
115 .sp
116 .LP
117 See \fBattributes\fR(5) for descriptions of the following attributes:
118 .sp
119
120 .sp
121 .TS
122 box;
123 c | c
124 l | l .
125 ATTRIBUTE TYPE ATTRIBUTE VALUE
126 _
127 MT-Level Unsafe
128 .TE
129
130 .SH SEE ALSO
131 .sp
132 .LP
133 \fBspray\fR(1M), \fBrpc_clnt_calls\fR(3NSL), \fBattributes\fR(5)
134 .SH NOTES
135 .sp
136 .LP
137 This interface is unsafe in multithreaded applications. Unsafe interfaces
138 should be called only from the main thread.
139 .sp
140 .LP
141 A spray program is not useful as a networking benchmark as it uses unreliable
142 connectionless transports, for example, udp. It can report a large number of
143 packets dropped, when the drops were caused by the program sending packets
144 faster than they can be buffered locally, that is, before the packets get to
145 the network medium.