Go Premium for a chance to win a PS4. Enter to Win

x
?
Solved

RPC

Posted on 1997-05-01
2
Medium Priority
?
903 Views
Last Modified: 2013-12-26
Dear friends,
I am into RPC (Just) and that's why these simple programs.
I am trying to pass a variable to another server and have
that server increment the value of the variable and return the variable.
The .x compiles with rpcgen and does not generate an XDR.
I know the reason for this. When I compile the client and
the server stubs with cnt.c and cnt_svc_proc.c, I do not seem
to have any compilation errors.
When I rsh the second server and try to run my client program, I get
output as follows:
================================
SERVER=rigel
Segmentation fault
================================

Please find my original code for your kind perusal. Please help.
cnt.x
=====
program COUNTPROG {
        version COUNTVERS {
        int COUNTINCR(int)=1;
        }=1;
}=0x20000001;
========================================
cnt.c
=====
#include<stdio.h>
#include<rpc/rpc.h>
#include"cnt.h"
#include<stdlib.h>
main(argc, argv)
int argc;
char *argv[];
{
CLIENT *cl;
char *server;
static int *counter1,*counter2;
        if (argc != 2) {
                fprintf(stderr,"usage: %s server\n", argv[0]);
                exit(1);
        }
server = argv[1];
printf("SERVER=%s\n",server);
/* *counter1 = atoi(*argv[2]); */
*counter1=15;
printf("counter1 = %p\n",*counter1);
cl=clnt_create(server, COUNTPROG,COUNTVERS,"udp");
        if (cl == NULL) {
                clnt_pcreateerror(server);
             exit(1);
        }
*counter2=*countincr_1(*counter1,cl);
printf("counter1 = %d\n", *counter2);
}
===================================================================
cnt_svc_proc.c
==============
#include<stdio.h>
#include<rpc/rpc.h>
#include "cnt.h"
int *countincr_1(counter1)
{
static int result;
result=counter1+1;
return(&result);
}
===================================================================
Rajesh
arc7292p@uel.ac.uk
0
Comment
Question by:RajAcharya
2 Comments
 
LVL 3

Expert Comment

by:dhm
ID: 1292731
I don't know about the rest of your RPC code (haven't bothered to try it out), but on inspection I can see two serious errors that will cause your client program to crash.

Your two variables, counter1 and counter2, are declared to be pointers to integer.  However, you never initialize the pointers; you just try to stuff the value 15 into the location pointed to by counter1, and the result of the RPC call into the location pointed to by counter2.

If you declare two integer variables, and then make the pointers counter1 and counter2 point to them, perhaps things will work better.

E.g.:

/* ... the first part of your program ... */

static int *counter1, *counter2;
int integer1, integer2;

counter1 = &integer1;
counter2 = &integer2;

/* ... the rest of your program ... */

0
 

Accepted Solution

by:
albertp earned 150 total points
ID: 1292732
The error is not with RPC, it's a basic C mistake:
If you use a counter, first you have to reserve space for it.
For example:

int *a;
a=(int *)malloc(sizeof(int));
*a=23;

Try it and tell me if it works.
See you!!

0

Featured Post

How to Use the Help Bell

Need to boost the visibility of your question for solutions? Use the Experts Exchange Help Bell to confirm priority levels and contact subject-matter experts for question attention.  Check out this how-to article for more information.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Introduction: Dynamic window placements and drawing on a form, simple usage of windows registry as a storage place for information. Continuing from the first article about sudoku.  There we have designed the application and put a lot of user int…
Introduction: Hints for the grid button.  Nested classes, templated collections.  Squash that darned bug! Continuing from the sixth article about sudoku.   Open the project in visual studio. First we will finish with the SUD_SETVALUE messa…
This video will show you how to get GIT to work in Eclipse.   It will walk you through how to install the EGit plugin in eclipse and how to checkout an existing repository.
Please read the paragraph below before following the instructions in the video — there are important caveats in the paragraph that I did not mention in the video. If your PaperPort 12 or PaperPort 14 is failing to start, or crashing, or hanging, …
Suggested Courses

926 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question