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How to connect multiple sockets in C

BuckGup
By BuckGup
in Programming
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Go to solution Solved by BuckGup,
8 hours ago, Eigenvektor said:

I can't help you with C in particular, but the general idea is this:

 

The server does "accept" to wait for incoming connections. This call is blocking, so you may want to do this on a separate thread. As soon as a client connects to the socket, you start a new thread to deal with this client and loop back to "accept", so that the server can accept further connection attempts.

  


while(!shutdown) {
    // This blocks, until a client connects
    final Socket socket = serverSocket.accept();
    
    // Use the returned socket to communicate with the client on a separate thread
    new Thread(() -> {
        communicate(socket);
    }).start();
  
    // Loop back to accept further connections
}

 

I eventually figured it out. I can have multiple clients on a single socket I just need to assign the connfd uniquely to each client as they come in. Once I did that I was able to compute on each node and return what they got to the head server

Posted

Hello I was wondering how you can connect multiple clients to one socket in C. 

I use  

sockfd = socket(AF_INET, SOCK_STREAM, 0)

to create a new socket and was thinking I could just do this in a loop waiting for 3 connections and assign it sockfd and iterate one as I go. My questions are is this the best way to do it?

What does the 0 mean? Also is it proper to connect the client to socket with 

connect(sockfd, (SA*)&servaddr, sizeof(servaddr))

 59     int sockfd, connfd;
 60     struct sockaddr_in servaddr, cli;
 61
 62     // socket create and varification
 63     sockfd = socket(AF_INET, SOCK_STREAM, 0);
 64     if (sockfd == -1) {
 65         printf("socket creation failed...\n");
 66         exit(0);
 67     }
 68     else
 69         printf("Socket successfully created..\n");
 70     bzero(&servaddr, sizeof(servaddr));
 71
 72     // assign IP, PORT
 73     servaddr.sin_family = AF_INET;
 74     servaddr.sin_addr.s_addr = inet_addr("10.35.195.47"); // thing1
 75     servaddr.sin_port = htons(PORT);
 76
 77     // connect the client socket to server socket
 78     if (connect(sockfd, (SA*)&servaddr, sizeof(servaddr)) != 0) {
 79         printf("connection with the server failed...\n");
 80         exit(0);
 81     }
 82     else
 83         printf("connected to the server..\n");
 84
 85     // function for chat
 86     func(sockfd);
 87
 88     // close the socket
 89     close(sockfd);

Above is all the client code

 

Below is all the server code. It used to be a simple chat client but I am adapting it to find prime numbers across multiple servers. 

119 int sockfd, connfd, len;
120     struct sockaddr_in servaddr, cli;
121
122     // socket create and verification
123     sockfd = socket(AF_INET, SOCK_STREAM, 0);
124     if (sockfd == -1) {
125         printf("socket creation failed...\n");
126         exit(0);
127     }
128     else
129         printf("Socket successfully created..\n");
130     bzero(&servaddr, sizeof(servaddr));
131
132     // assign IP, PORT
133     servaddr.sin_family = AF_INET;
134     servaddr.sin_addr.s_addr = htonl(INADDR_ANY);
135     servaddr.sin_port = htons(PORT);
136
137     // Binding newly created socket to given IP and verification
138     if ((bind(sockfd, (SA*)&servaddr, sizeof(servaddr))) != 0) {
139         printf("socket bind failed...\n");
140         exit(0);
141     }
142     else
143         printf("Socket successfully binded..\n");
144
145     // Now server is ready to listen and verification
146     if ((listen(sockfd, 5)) != 0) {
147         printf("Listen failed...\n");
148         exit(0);
149     }
150     else
151         printf("Server listening..\n");
152     len = sizeof(cli);
153
154     // Accept the data packet from client and verification
155     connfd = accept(sockfd, (SA*)&cli, &len);
156     if (connfd < 0) {
157         printf("server acccept failed...\n");
158         exit(0);
159     }
160     else
161         printf("server acccept the client...\n");
162
163     // Function for chatting between client and server
164     func(connfd);
165
166     // After chatting close the socket
167     close(sockfd);

 

Any help or insight would be gratefully appreciated 

▓ƆԀ▓ S▓₱▓Ɇ▓c▓s▓: i7 6ʇɥפᴉƎ00K (4.4ghz), Asus DeLuxe X99A II, GT҉X҉1҉0҉8҉0 Zotac Amp ExTrꍟꎭe),Si6F4Gb D???????r PlatinUm, EVGA G2 Sǝʌǝᘉ5ᙣᙍᖇᓎᙎᗅᖶt, Phanteks Enthoo Primo, 3TB WD Black, 500gb 850 Evo, H100iGeeTeeX, Windows 10, K70 R̸̢̡̭͍͕̱̭̟̩̀̀̃́̃͒̈́̈́͑̑́̆͘͜ͅG̶̦̬͊́B̸͈̝̖͗̈́, G502, HyperX Cloud 2s, Asus MX34. פN∩SW∀S 960 EVO

Just keeping this here as a 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I can't help you with C in particular, but the general idea is this:

 

The server does "accept" to wait for incoming connections. This call is blocking, so you may want to do this on a separate thread. As soon as a client connects to the socket, you start a new thread to deal with this client and loop back to "accept", so that the server can accept further connection attempts.

  

while(!shutdown) {
    // This blocks, until a client connects
    final Socket socket = serverSocket.accept();
    
    // Use the returned socket to communicate with the client on a separate thread
    new Thread(() -> {
        communicate(socket);
    }).start();
  
    // Loop back to accept further connections
}

 

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8 hours ago, Eigenvektor said:

I can't help you with C in particular, but the general idea is this:

 

The server does "accept" to wait for incoming connections. This call is blocking, so you may want to do this on a separate thread. As soon as a client connects to the socket, you start a new thread to deal with this client and loop back to "accept", so that the server can accept further connection attempts.

  


while(!shutdown) {
    // This blocks, until a client connects
    final Socket socket = serverSocket.accept();
    
    // Use the returned socket to communicate with the client on a separate thread
    new Thread(() -> {
        communicate(socket);
    }).start();
  
    // Loop back to accept further connections
}

 

I eventually figured it out. I can have multiple clients on a single socket I just need to assign the connfd uniquely to each client as they come in. Once I did that I was able to compute on each node and return what they got to the head server

▓ƆԀ▓ S▓₱▓Ɇ▓c▓s▓: i7 6ʇɥפᴉƎ00K (4.4ghz), Asus DeLuxe X99A II, GT҉X҉1҉0҉8҉0 Zotac Amp ExTrꍟꎭe),Si6F4Gb D???????r PlatinUm, EVGA G2 Sǝʌǝᘉ5ᙣᙍᖇᓎᙎᗅᖶt, Phanteks Enthoo Primo, 3TB WD Black, 500gb 850 Evo, H100iGeeTeeX, Windows 10, K70 R̸̢̡̭͍͕̱̭̟̩̀̀̃́̃͒̈́̈́͑̑́̆͘͜ͅG̶̦̬͊́B̸͈̝̖͗̈́, G502, HyperX Cloud 2s, Asus MX34. פN∩SW∀S 960 EVO

Just keeping this here as a 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14 minutes ago, BuckGup said:

I eventually figured it out. I can have multiple clients on a single socket I just need to assign the connfd uniquely to each client as they come in. Once I did that I was able to compute on each node and return what they got to the head server

Issue with this approach is that if your server has multiple clients, it will hang accepting new client connection and pretty much useless during this time. It can neither send nor receive messages. 

 

For multi client server architecture, it will need to be either multiprocess(using fork) or multithread(pthread) or multitasking(make code asynchronous using pselect).

Sudo make me a sandwich 

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11 minutes ago, wasab said:

Issue with this approach is that if your server has multiple clients, it will hang accepting new client connection and pretty much useless during this time. It can neither send nor receive messages. 

 

For multi client server architecture, it will need to be either multiprocess(using fork) or multithread(pthread) or multitasking(make code asynchronous using pselect).

Correct, for this exercise that was the idea. As I agree it is sorta worthless as it doesn't actually save and computational time 

▓ƆԀ▓ S▓₱▓Ɇ▓c▓s▓: i7 6ʇɥפᴉƎ00K (4.4ghz), Asus DeLuxe X99A II, GT҉X҉1҉0҉8҉0 Zotac Amp ExTrꍟꎭe),Si6F4Gb D???????r PlatinUm, EVGA G2 Sǝʌǝᘉ5ᙣᙍᖇᓎᙎᗅᖶt, Phanteks Enthoo Primo, 3TB WD Black, 500gb 850 Evo, H100iGeeTeeX, Windows 10, K70 R̸̢̡̭͍͕̱̭̟̩̀̀̃́̃͒̈́̈́͑̑́̆͘͜ͅG̶̦̬͊́B̸͈̝̖͗̈́, G502, HyperX Cloud 2s, Asus MX34. פN∩SW∀S 960 EVO

Just keeping this here as a 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2 minutes ago, BuckGup said:

Correct, for this exercise that was the idea. As I agree it is sorta worthless as it doesn't actually save and computational time 

I would suggest that you just use fork(). It is so much easier than the other two. 

 

For high performance servers, pselect is what you want to aim for though. Servers like Apache and nginx use this appoarch. 

Sudo make me a sandwich 

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