Comments on: Socket programming in C on Linux – The Ultimate Guide for Beginners

By: Silver Moon

Silver Moon — Wed, 16 Aug 2023 01:30:38 +0000

In reply to Mike Kelly. thanks for the feedback. shall improve in future. glad that you found the guide useful.

By: Mike Kelly

Mike Kelly — Tue, 15 Aug 2023 02:58:55 +0000

Thanks for this tutorial. Much better than the usual recv/send server side examples. Using this info I wrote a server side program for my GPS tracker, a Carscop CCTR-803.

Re: improvements, on the server side code, zero out the buffer after the write (ie: after “send the message back to client”) in the connection handler.

By: Nick

Nick — Sun, 26 Dec 2021 02:01:01 +0000

In reply to Jeroen. Hi, you can’t compare strings with == .

By: Steve

Steve — Sun, 10 Oct 2021 10:58:30 +0000

Thank you so much. Very well explained and so helpful. Congratulations!

By: red

red — Tue, 13 Jul 2021 14:55:56 +0000

thank you soo much , helpful and perfect explanation

By: Oin-oin

Oin-oin — Mon, 05 Jul 2021 14:43:01 +0000

You never mention CLOSING the socket. Let’s suppose we have clients contacting a server to receive a file of arbitrary length. So the client now has to read the response from the server until the server reaches the end-of-file EOF. Can the server simply close the socket when it has finished ? Or will the client receive a “Socket reset by peer” ?

By: Nico

Nico — Fri, 11 Jun 2021 22:26:29 +0000

Thank you! Exactly what I was looking for in a post about the basics of sockets in C.

By: salil

salil — Sun, 06 Jun 2021 18:10:02 +0000

In reply to Mike. Can you send me the code client

By: Manu

Manu — Tue, 01 Jun 2021 06:26:43 +0000

Brilliantly written and explained.

By: Constantin

Constantin — Wed, 19 May 2021 07:29:44 +0000

The tutorial is very well written and it teaches the main concept of the Linux sockets and the examples are useful, thanks for your work.

By: Walter Milner

Walter Milner — Mon, 01 Mar 2021 14:05:59 +0000

Your http read code usually gets a ‘bad request’ response.
This is because http 1.1 requires a host = in the header. Something like
char * message = “GET / HTTP/1.1\r\nHost: example.com\r\n\r\n”;
if( send(socketID , message , strlen(message) , 0) < 0)

By: Paul Antonucci

Paul Antonucci — Tue, 16 Feb 2021 17:59:09 +0000

Thanks for this tutorial.
Is the second like below supposed to be commented out?

//Now join the thread , so that we dont terminate before the thread
//pthread_join( sniffer_thread , NULL);
puts(“Handler assigned”);

By: Prathibha

Prathibha — Tue, 12 Jan 2021 07:19:30 +0000

Explanation is good. Concepts are made very clear with detailed explanation and example.

By: Mike

Mike — Wed, 06 Jan 2021 08:00:26 +0000

Very nice and helpful tutorial , thank you a lot for sharing
I would like to make a question in you example. I would like to send two variables from client to server (a) & (b) and to make the sumution of those to server and after that the server to reply the result to client.
which change can i make to your example , can you help me?

Thank you a lot

By: Wang, Huan-Sheng

Wang, Huan-Sheng — Wed, 16 Dec 2020 05:02:05 +0000

Great tutorial article!

By: mamakmert

mamakmert — Tue, 01 Sep 2020 08:22:37 +0000

In reply to Michael. You can simply do it with Packet Sender

By: Gerald

Gerald — Sat, 29 Feb 2020 21:36:55 +0000

In reply to Utku.

if ( socket_desc = -1) => means
socket_desc = -1;
if (socket_desc != 0 ) { // true
this code will be executed every time
}

best regards

By: Michael

Michael — Tue, 06 Aug 2019 11:30:02 +0000

It would be nice to show a File Transfer over Sockets, possibly using ‘sendfile’ ?

By: Rajyalakshmi

Rajyalakshmi — Tue, 18 Jun 2019 07:18:35 +0000

nice helpful tutorial :) Have you written any such tutorial for writing sockets in non-blocking mode and with polling option C ?

By: Everett White

Everett White — Sun, 05 May 2019 17:02:46 +0000

Can the source code presented in this tutorial ‘open source?’ Can I use, modify, make derivative works, etc? Is the source code available on github, and is there a license attached?

This is a great tutorial, and very helpful to me.