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An Example Using Local Namespace Sockets

We illustrate sockets with two programs.The server program, in Listing 5.10, creates a

local namespace socket and listens for connections on it.When it receives a connection,

it reads text messages from the connection and prints them until the connection

closes. If one of these messages is “quit,” the server program removes the socket and

ends.The socket-server program takes the path to the socket as its command-line

argument.

(socket-server.c) Local Namespace Socket Server

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include <sys/socket.h>

#include <sys/un.h>

#include <unistd.h>

/* Read text from the socket and print it out. Continue until the

socket closes. Return nonzero if the client sent a “quit”

message, zero otherwise. */

int server (int client_socket)

{

while (1) {

int length;

char* text;

/* First, read the length of the text message from the socket. If

read returns zero, the client closed the connection. */

if (read (client_socket, &length, sizeof (length)) == 0)

return 0;

/* Allocate a buffer to hold the text. */

text = (char*) malloc (length);

/* Read the text itself, and print it. */

read (client_socket, text, length);

printf (“%s\n”, text);

/* Free the buffer. */

free (text);

/* If the client sent the message “quit,” we’re all done. */

if (!strcmp (text, “quit”))

return 1;

}

}

int main (int argc, char* const argv[])

{

const char* const socket_name = argv[1];

int socket_fd;

struct sockaddr_un name;

int client_sent_quit_message;

/* Create the socket. */

socket_fd = socket (PF_LOCAL, SOCK_STREAM, 0);

/* Indicate that this is a server. */

name.sun_family = AF_LOCAL;

strcpy (name.sun_path, socket_name);

bind (socket_fd, &name, SUN_LEN (&name));

/* Listen for connections. */

listen (socket_fd, 5);

/* Repeatedly accept connections, spinning off one server() to deal

with each client. Continue until a client sends a “quit” message. */

do {

struct sockaddr_un client_name;

socklen_t client_name_len;

int client_socket_fd;

/* Accept a connection. */

client_socket_fd = accept (socket_fd, &client_name, &client_name_len);

/* Handle the connection. */

client_sent_quit_message = server (client_socket_fd);

/* Close our end of the connection. */

close (client_socket_fd);

}

while (!client_sent_quit_message);

/* Remove the socket file. */

close (socket_fd);

unlink (socket_name);

return 0;

}

The client program, in Listing 5.11, connects to a local namespace socket and sends

a message.The name path to the socket and the message are specified on the


command line.