Client server program in c message question - c

Question

I recently made a server client program in c but it doesn't seem to work. the only thing i get when compiling it is a warning and the fact that there is a fault in the client. Could anyone help me a bit?
This is the server code:
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
int main()
{
int server_socket;
server_socket = socket(AF_INET,SOCK_STREAM,0);
struct sockaddr_in server_address;
int addrlen = sizeof(server_address);
server_address.sin_family = AF_INET;
server_address.sin_port = htons(9000);
server_address.sin_addr.s_addr = INADDR_ANY;
bind (server_socket, (struct sockaddr*) &server_address, sizeof(server_address));
int client_socket;
listen(server_socket, 3);
client_socket=accept(server_socket, NULL, (socklen_t*)&addrlen);
char response[256];
recv(server_socket, &response, sizeof(response), 0);
printf("%s",response);
pclose (server_socket);
return (0);
}
and this is the client code:
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
int main()
{
int network_socket;
network_socket = socket(AF_INET,SOCK_STREAM, 0);
struct sockaddr_in server_address;
server_address.sin_family = AF_INET;
server_address.sin_port = htons(9000);
server_address.sin_addr.s_addr = INADDR_ANY;
int connection_status = connect(network_socket, (struct sockaddr*)&server_address, sizeof(server_address));
if (connection_status == -1) { printf("ERROR"); }
char maw[256] = "this is a message"; send(network_socket, maw, sizeof(maw), 0); close(server_address);
return(0);
pclose(network_socket);
}

Answer 1

There is also an error in the server code.
Server code:
When you want to receive the message from the client, you must use the client_socket in your code in the recv() function. Not the server_socket itself.
Client code:
Why you are using the pclose() function, for closing the socket? It's for pipes and requires a FILE pointer. Furthermore the function never get called (after return statement).
This should work (tested on my system):
Server:
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
int main()
{
int server_socket;
server_socket = socket(AF_INET,SOCK_STREAM,0);
struct sockaddr_in server_address;
int addrlen = sizeof(server_address);
server_address.sin_family = AF_INET;
server_address.sin_port = htons(9000);
server_address.sin_addr.s_addr = INADDR_ANY;
bind (server_socket, (struct sockaddr*) &server_address, sizeof(server_address));
int client_socket;
listen(server_socket, 3);
client_socket=accept(server_socket, NULL, (socklen_t*)&addrlen);
char response[256];
recv(client_socket, &response, sizeof(response), 0);
printf("%s",response);
shutdown (client_socket, SHUT_RDWR);
close (client_socket);
shutdown (server_socket, SHUT_RDWR);
close (server_socket);
return (0);
}
Client:
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
int main()
{
int network_socket;
network_socket = socket(AF_INET,SOCK_STREAM, 0);
struct sockaddr_in server_address;
server_address.sin_family = AF_INET;
server_address.sin_port = htons(9000);
server_address.sin_addr.s_addr = INADDR_ANY;
int connection_status = connect(network_socket, (struct sockaddr*)&server_address, sizeof(server_address));
if (connection_status == -1) { printf("ERROR"); }
char maw[256] = "this is a message";
send(network_socket, maw, sizeof(maw), 0);
shutdown (network_socket, SHUT_RDWR);
close(network_socket);
return(0);
}
For the function shutdown() see this answer.