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 length is stored in Network Byte Order, of course.

This is classic — one of the main reasons I programmijg programming in C. StackOverflow and GitHub didn’t even exist! These functions don’t do DNS lookups—you’ll need getaddrinfo for that.

[PDF] Beej’s Guide to Network Programming Using Internet Sockets : programming

I took a course on Linux Network Programming in college; at the time, my instructor said that while he loved that book, he felt David Kerrisk’s Linux Programming Interface [1] had come to supersede it. The maximum lengths are: You can also see in the above example that the last couple decimal places are not correctly preserved. Just design your programs so that you’re always the one initiating the connection, and you’ll be fine.

So what is this struct hostent that gets returned? Are you juggling that in your head yet? You’ll probably have to wait some part of your standard Unix timeslice no matter how small you set your struct timeval. It allows you to cut off communication in a certain direction, or both ways just like close does.


This one is quite easy but dangerous! What happened to the remaining bytes?


After you’ve finished using the socket for whatever demented scheme you have concocted and you don’t want to send or recv or, indeed, do anything else at all with the socket, you can close it, and it’ll be freed up, never to be used again. It’s quite amazing how many of us this guide has impacted. They are included here because they can still be found in the wild.

Then whatever you get, stick it onto the back of a buffer, and finally check to see if the packet is complete. Again, this is just like recv with the addition of a couple fields.

Beej’s Guide to Network Programming

But enough of the starry-eyed future—we’re stuck in the bit present. For instance, if you have “www. Fortunately for you, there are a bunch of functions that allow you to manipulate IP addresses. All of this information can be gleaned from the results of the getaddrinfo call, which rocks. If so, then there’s a new connection waiting to be accept ed! Ok, I did say it was easy. All this client does is connect to the host you specify on the command line, port Were you afraid there for a second?

It’s easy enough to send text data across the network, you’re finding, but what happens netwofk you want to send some “binary” data like int s or float s?


C is pretty annoying to write servers in. It seems that nowadays it’s easier than ever to learn to code, with many different resources and communities at the disposal of the newbie.

Beej’s Guide to Network Programming | Hacker News

That is the same result as if you tried to convert the string ” The following code snippet waits 2. To be safe, you should assume that you might receive a partial packet like maybe we receive ” 18 42 65 6E 6A ” from Benjamin, beeej, but that’s all we get in this call to recv. In fact, if you’ve gotten this far, you should consider yourself fairly accomplished in the basics of Unix network programming!

It changes or “encodes”, if you want to think of it that way a number from whatever the host format is into Network Byte Order. Finally, programmimg are several flags you can pass, but here a a couple good ones. It returns the name of the computer that your program is running on.

What do I mean by “known binary format”? Who is translating the IP address from one to the other? Then we make the call.