Buy a (real) Book! Beej’s Guide to Network Programming (online and for download) This is a beginner’s guide to socket programming with Internet sockets . Beej’s Guide to Network Programming. Note for Windows Programmers. I have a particular dislike for Windows, and encourage you to try Linux, BSD. Beej’s Guide to Network Programming has been one of the top socket programming guides on the Internet for the last 15 years, and it’s now for the first time.

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The downside is that you need to know and understand quite a lot. And in terms of guides “like this,” there are thousands of new posts every day across the blogosphere by developers sharing their experience. They are definitely to be used sparingly and appropriately. Well, it’s just some binary data that represents whatever you feel is necessary to complete your project. The code to do that looks bbeej like this:.

And check it proyramming You just put a slash after the IP address, and then follow that by the number of network bits in decimal. Also, select only works with socket descriptors, not file descriptors like 0 for stdin.

As you can see, this call is basically the same as the call to send with the addition of two other pieces of information.

Python and Perl programmers will want to check out their language’s pack and unpack functions for accomplishing the same thing. See the sendall function implementation for details. On top of that is the genral memory unsafety of C.

By Excalibur I swear it! Lucky for you, program, you’re now perusing the section on connect —how to connect to a remote host. But I think the goto statement is actually cleaner. If so, then there’s a new connection waiting to be accept ed!


The function returns 0 on successful completion, and -1 on error, setting errno as usual. If that’s not satisfactory, you can ask your sysadmins to poke huide hole in the firewall so that people can connect to you.

You are more than welcome to mirror this site, whether publicly or privately. Also, note that there’s no need to listen or accept. We have a microsecond resolution timer!

Beej’s Guide to Network Programming

Look up bee host name and service name information for a given struct sockaddr. To be safe, you should assume that you might receive a partial packet like maybe we receive ” 18 42 65 6E 6A ” from Benjamin, above, but programking all we get in this call to recv. It nftwork mostly on a how much you should have ALL OF IT error handling you do and b how well you know what’s given to you in the standard libs of C so you don’t go reimplementing features and functions.

See the section on socket for details. That’s right, suddenly you have two socket file descriptors for the price of one! Returns zero on success, or -1 on error and errno will be set accordingly.


Run the client in one window and the server in another. But it is possible, I insist, that you can, with the proper authority, send data to multiple hosts at the same time! Not the worst kind of result really.

It allows you to cut off communication guixe a certain direction, or both ways just prgoramming close does. Unfortunately, there are no similar functions for float types.

I went ahead and googled beeg. What is that thing? Used to know a guy on efnet in unix channels that went by Beej. Well, it turns out that not all architectures represent a double or int for that matter with the same bit representation or even the same byte ordering! However, it has the disadvantage that it is slow to convert, and the results almost always take up more space than the original number!


But people like what they like, and you Windows folk will be pleased to know that this information is generally applicable to you guys, with a few minor changes, if any. Same guide, same course, same year. Shouldn’t have even posted it. Except for this sentence, where I’m going to tell you that ” Raw Sockets” are also very powerful guie you should look them up. Well, relax and buy yourself a non-alcoholic or alcoholic drink, because as a beginner, you don’t even have to worry about NAT, since it’s done for you transparently.

The book is definitely worth a read since you can use zmq in basically any language you can think of. But now we’re living in an era where we’re talking about every human having an IP address, every computer, every calculator, every phone, every parking meter, and why not every puppy dog, as well. Hopefully, though, it’ll be just enough for those man pages to start making sense So that return value is already spoken for, and -1 means “error”, so I chose -2 as my timeout indicator.

It does look pretty cool, but it definitly does not cover all the cases where I’ve had to use low level socket APIs.

The reason they can do this is because they’re allowed to. It was probably the best thing to read to quickly start learning sockets!

Get ready—the accept call is kinda weird!