CODEWITHSUNDEEP
csockets
Kamsiinov
Kamsiinov

Reputation: 1490

C drop connection after sending data

How can I drop connection in plain C after I have sent the data? I have a server which creates socket and waits for connection. After getting connection it sends char array through that socket. After that it should drop the connection and go back to waiting next connection. How can I do that? This is my test code:

int main()
{
char str[100];
int listen_fd, comm_fd;
struct sockaddr_in servaddr;
listen_fd = socket(AF_INET, SOCK_STREAM, 0);
bzero(&servaddr, sizeof(servaddr));
servaddr.sin_family = AF_INET;
servaddr.sin_addr.s_addr = htons(INADDR_ANY);
servaddr.sin_port = htons(22000);
bind(listen_fd, (struct sockaddr *) &servaddr, sizeof(servaddr));
listen(listen_fd, 10);
comm_fd = accept(listen_fd, (struct sockaddr*) NULL, NULL);

while (1)
{
    bzero(str, 100);
    write(comm_fd, str, strlen(str) + 1);
}
}

Upvotes: 0

Views: 50

Answers (1)

Chris Turner
Chris Turner

Reputation: 8142

comm_fd = accept(listen_fd, (struct sockaddr*) NULL, NULL);

while (1)
{
    bzero(str, 100);
    write(comm_fd, str, strlen(str) + 1);
}

The code inside the while loop is the code that will be repeated constantly...now look where you've placed the call to accept the new connection. It's outside of the while loop. As your code currently stands, you'll call it once and then constantly send data at the new connection.

If you put the accept inside the while loop and also close that new connection, like the following code, you should get the result you're looking for.

while (1)
{
    comm_fd = accept(listen_fd, (struct sockaddr*) NULL, NULL);
    bzero(str, 100);
    write(comm_fd, str, strlen(str) + 1);
    close(comm_fd);
}

Upvotes: 1

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