Specifications

Page 10 Remote Procedure Call Programming Guide
3.1. More on the Server Side
The server for the nusers() program shown below does the same thing as the one using registerrpc() above,
but is written using a lower layer of the RPC package:
#include <stdio.h>
#include <rpc/rpc.h>
#include <utmp.h>
#include <rpcsvc/rusers.h>
main()
{
SVCXPRT *transp;
int nuser();
transp = svcudp_create(RPC_ANYSOCK);
if (transp == NULL){
fprintf(stderr, "can’t create an RPC server\n");
exit(1);
}
pmap_unset(RUSERSPROG, RUSERSVERS);
if (!svc_register(transp, RUSERSPROG, RUSERSVERS,
nuser, IPPROTO_UDP)) {
fprintf(stderr, "can’t register RUSER service\n");
exit(1);
}
svc_run(); /* Never returns */
fprintf(stderr, "should never reach this point\n");
}
nuser(rqstp, transp)
struct svc_req *rqstp;
SVCXPRT *transp;
{
unsigned long nusers;
switch (rqstp->rq_proc) {
case NULLPROC:
if (!svc_sendreply(transp, xdr_void, 0))
fprintf(stderr, "can’t reply to RPC call\n");
return;
case RUSERSPROC_NUM:
/*
* Code here to compute the number of users
* and assign it to the variable nusers
*/
if (!svc_sendreply(transp, xdr_u_long, &nusers))
fprintf(stderr, "can’t reply to RPC call\n");
return;
default:
svcerr_noproc(transp);
return;
}
}