UDP Client Server Program

[Pok]

Hi....I have this UDP Socket program where i need to type the string "My name is John" in client and server should return that "your ID is 1234". I am trying to run the codes but everytime it is returning the same line instead of the answer.

Here is my sample code :

#include "unp.h"
#include “string.h”

void
dg_echo(int sockfd, SA *pcliaddr, socklen_t clilen)
{
int n;
socklen_t len;
struct args args;
struct result result;

for ( ; ; ) {
len = clilen;
n = Recvfrom(sockfd, &args, sizeof(args), 0, pcliaddr, &len);

char * s1 = “My name is John”;
char * s2 = “My name is Mary”;

if (strcmp(args.arg1, s1) == 0)
result.arg2[] = “Hi John, your ID is 1234”;

if (strcmp(args.arg1, s2) == 0)
result.arg2[] = “Hi Mary, you are not registered”;

sendto(sockfd, &result, sizeof(result), 0, pcliaddr, &len);
}
}


I think my string comparision is having some problem. Please Help....

[kbw]

That looks like an example from Stevens. Why don't you start with the full working example before you change it.

[Pok]

Yah....I ran with the original code..and it works just fine...But I want to do this modification and want to print out the result...but don't know where is wrong...

[kbw]

I've had another look at this, and looked at the definition of struct args. The only one I can find is:

struct args {
  long  arg1;
  long  arg2;
};

If that's the one you're using, your code shouldn't even compile. The bottom line is, if we can see the all the code, it's impossible to work out what's gone wrong.