lab6_question2_client.c

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <netinet/in.h>
int main() {
    int client_socket;
    char buffer[256];
    char hello_msg[256];
    struct sockaddr_in server_address, client_address;
    // Creating a socket file descriptor
    if ( (client_socket = socket(AF_INET, SOCK_DGRAM, 0)) <  0 ){
        printf("error: socket creation failed\n");
        return -1; }
    //filling the server address record
    server_address.sin_family = AF_INET;
    server_address.sin_port = htons(6000);
    server_address.sin_addr.s_addr=inet_addr("127.0.0.1");
    sprintf(hello_msg, "Hello from client");
    //send a message from the known server address
    sendto(client_socket, (const char *)hello_msg, strlen(hello_msg), MSG_CONFIRM,
           (const struct sockaddr *) &server_address, sizeof(server_address));
    printf("Hello message is sent.\n");
    int n, server_address_len;
    //receive a message from the known server address
    n = recvfrom(client_socket, (char *)buffer, 255, MSG_WAITALL, (struct sockaddr
                                                                   *) &server_address, &server_address_len);
    buffer[n] = '\0';
    printf("A message from the server : %s\n", buffer);
    close(client_socket);
    return 0; 
    }