Testing Programs Using Low-Level Raw RPC
Two pseudo-RPC interface routines bypass all the network software. The
routines shown in clnt_raw_create() and svc_raw_create() do not use any real transport.
Note - Do not use raw mode on production systems. Raw mode is intended
as a debugging aid only. Raw mode is not MT safe.
The following code example is compiled and linked using the following
makefile:
all: raw
CFLAGS += -g
raw: raw.o
cc -g -o raw raw.o -lnsl
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Example 4-19 Simple Program Using Raw RPC
/*
* A simple program to increment a number by 1
*/
#include <stdio.h>
#include <rpc/rpc.h>
#include <rpc/raw.h>
#define prognum 0x40000001
#define versnum 1
#define INCR 1
struct timeval TIMEOUT = {0, 0};
static void server();
main (argc, argv)
int argc;
char **argv;
{
CLIENT *cl;
SVCXPRT *svc;
int num = 0, ans;
int flag;
if (argc == 2)
num = atoi(argv[1]);
svc = svc_raw_create();
if (svc == (SVCXPRT *) NULL) {
fprintf(stderr, "Could not create server handle\n");
exit(1);
}
flag = svc_reg( svc, prognum, versnum, server,
(struct netconfig *) NULL );
if (flag == 0) {
fprintf(stderr, "Error: svc_reg failed.\n");
exit(1);
}
cl = clnt_raw_create( prognum, versnum );
if (cl == (CLIENT *) NULL) {
clnt_pcreateerror("Error: clnt_raw_create");
exit(1);
}
if (clnt_call(cl, INCR, xdr_int, (caddr_t) &num, xdr_int,
(caddr_t) &ans, TIMEOUT)
!= RPC_SUCCESS) {
clnt_perror(cl, "Error: client_call with raw");
exit(1);
}
printf("Client: number returned %d\n", ans);
exit(0);
}
static void
server(rqstp, transp)
struct svc_req *rqstp;
SVCXPRT *transp;
{
int num;
fprintf(stderr, "Entering server procedure.\n");
switch(rqstp->rq_proc) {
case NULLPROC:
if (svc_sendreply( transp, xdr_void,
(caddr_t) NULL) == FALSE) {
fprintf(stderr, "error in null proc\n");
exit(1);
}
return;
case INCR:
break;
default:
svcerr_noproc(transp);
return;
}
if (!svc_getargs( transp, xdr_int, &num)) {
svcerr_decode(transp);
return;
}
fprintf(stderr, "Server procedure: about to increment.\n");
num++;
if (svc_sendreply(transp, xdr_int, &num) == FALSE) {
fprintf(stderr, "error in sending answer\n");
exit (1);
}
fprintf(stderr, "Leaving server procedure.\n");
}
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Note the following points about the example:
