Thread: Client Unix Program Trouble

For my CS class, the assignment is to write a simple program that acts as a client, and connects to another program running that acts as a server. Both of these programs are running on the university's Unix server.
With the handouts he's given us, one had a link that has the client program actually written on it. Since I don't want to use that and get caught for plagirism, I used it for advice, and went on my own for most of it. The problem is now, the prewritten one works when I test it but mine doesn't. They're obviously different, but mine doesn't even seem to begin, whereas the test begins and runs just fine.

Here's mine:

Code:

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


void error(char *msg)
{
    perror(msg);
    exit(0);
}


int main(int argc, char *argv[])
{
    printf("Client Started/n");
    int sockFd, portnum, n;
    char buffer[256];


    sockFd = socket(AF_INET, SOCK_STREAM, 0);
    printf("Socket Made /n");
    portnum = atoi(argv[2]);


    struct sockaddr_in sa;
    struct hostent *hp;


    hp = gethostbyname(argv[1]);


    sa.sin_family = AF_INET;    
    
    sa.sin_port = htons(portnum);


    memcpy(&sa.sin_addr, hp, sizeof(hp)+1);


    n = connect(sockFd, (struct sockaddr *)&sa, sizeof(sa));/*Not the segfault*/


    printf("Socket Connected/n");


    fgets(buffer,255,stdin);/*not the segfault*/
    
    n = write(sockFd, buffer, strlen(buffer));


    n = read(sockFd, buffer, strlen(buffer));


    printf("ACK: ");


    printf("%s\n",buffer);


    close(sockFd);


    system("pkill -9 -f Server");


    return 0;
}

Here's the test:

Code:

#include <stdio.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h> 


void error(char *msg)
{
    perror(msg);
    exit(0);
}


int main(int argc, char *argv[])
{
    printf("Client Started");
    int sockfd, portno, n;


    struct sockaddr_in serv_addr;
    struct hostent *server;


    char buffer[256];
    if (argc < 3) {
       fprintf(stderr,"usage %s hostname port\n", argv[0]);
       exit(0);
    }
    portno = atoi(argv[2]);
    sockfd = socket(AF_INET, SOCK_STREAM, 0);
    if (sockfd < 0) 
        error("ERROR opening socket");
    server = gethostbyname(argv[1]);
    if (server == NULL) {
        fprintf(stderr,"ERROR, no such host\n");
        exit(0);
    }
    bzero((char *) &serv_addr, sizeof(serv_addr));
    serv_addr.sin_family = AF_INET;
    bcopy((char *)server->h_addr, 
         (char *)&serv_addr.sin_addr.s_addr,
         server->h_length);
    serv_addr.sin_port = htons(portno);
    if (connect(sockfd,(struct sockaddr *)&serv_addr,sizeof(serv_addr)) < 0) 
        error("ERROR connecting");
    printf("Please enter the message: ");
    bzero(buffer,256);
    fgets(buffer,255,stdin);
    n = write(sockfd,buffer,strlen(buffer));
    if (n < 0) 
         error("ERROR writing to socket");
    bzero(buffer,256);
    n = read(sockfd,buffer,255);
    if (n < 0) 
         error("ERROR reading from socket");
    printf("%s\n",buffer);
    return 0;
}

I compile them both the same, I run them both the same, yet mine won't even show the "Client Started" output whereas the test will and then continue on. What's going on? Thanks!

Oh, I did some more testing, and I found another issue. The assignment requires us to write it so that the client program will display the acknowledgement number from the server. Neither of the programs seem to do that. How do I go about adding that part in?