CODEWITHSUNDEEP
csockets
RushiSrinivas.K
RushiSrinivas.K

Reputation: 171

How to close sockets in C (GCC on Linux)

I'm completely new to C. And am following this yt tutorial on sockets. However he's using the close(sock) function. There's 2 problems:

Can you please explain. This question might seem a little too dumb. Here's the Client code:

#include <stdio.h>
#include <stdlib.h>

#include <sys/types.h>
#include <sys/socket.h>

#include <netinet/in.h>

int main()
{
    // Create a socket
    int network_socket; 
    network_socket = socket(AF_INET, SOCK_STREAM, 0);

    // Address for the socket
    struct  sockaddr_in server_address;
    server_address.sin_family = AF_INET;
    server_address.sin_port = htons(9002);
    server_address.sin_addr.s_addr = INADDR_ANY;

    int connection = connect(network_socket, (struct sockaddr *) &server_address, sizeof(server_address));
    printf("%d\n", connection);

    char response[256];
    recv(network_socket, &response, sizeof(response), 0);

    printf("%s\n", response);
    return 0;
}

Upvotes: 0

Views: 6539

Answers (2)

jenny jenkins
jenny jenkins

Reputation: 95

You need to pass the socket file descriptor as the argument for close(). Which, for your code, is network_socket. So, close() need to be called as close(network_socket);

Also, you need to use the <unistd.h> header for the close() function.

Upvotes: 3

Rup
Rup

Reputation: 34408

There's no variable called sock. The socket is called something else.

Yes, it's network_socket in your code. So you want close(network_socket);.

I can't find the close function. The compiler is saying that the function doesn't exist

You need #include <unistd.h>, which is where close() is declared. (If you look at man close you'll see this at the top.)

Upvotes: 8

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