client.c

#include <stdio.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <string.h>
#include <unistd.h>
#include <arpa/inet.h>

#define BUFSIZE 16350
#define PORTID 40001


int main() {
    int s = socket(AF_INET, SOCK_DGRAM, 0);

    struct sockaddr_in serveraddr;
    memset(&serveraddr, 0, sizeof(serveraddr));
    serveraddr.sin_port = htons(PORTID);
    serveraddr.sin_addr.s_addr = inet_addr("127.0.0.1");
    serveraddr.sin_family = AF_INET;

    int buf[BUFSIZE];
    memset(buf, 0, sizeof(buf));
    int k = 0, j;
    for(j = 0; j < BUFSIZE; ++j) {
        buf[k++] = j;
    }

    sendto(s, buf, sizeof(int)*BUFSIZE, 0, (struct sockaddr*) &serveraddr, sizeof(serveraddr));
    printf("YOU SAY EI MACARENA\n");
    int ap[BUFSIZE];
    recvfrom(s, ap, sizeof(int)*BUFSIZE, 0, (struct sockaddr*) &serveraddr, sizeof(serveraddr));
    printf("GOOD JOB\n");
    int i, nr = 0;
    for(i = 0; i < BUFSIZE; ++i) {
        if(i == ap[i])
            ++nr;
    }
    printf("%d\n", nr);
    return 0;
}