Beej’s Guide to Unix Interprocess Communication. Version (May). Intro. You know what’s easy? fork() is easy. You can fork off new processes all. I owe my career to Beej. I was getting burnt out of web development and his guides (along with Jesse Storimer’s books) made programming fun. Beejs Guide to Unix IPCBrian “Beej Jorgensen” [email protected] This guide is written in XML using the vim editor on a Slackware.

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As, I originally said, though, there is certainly no one-size-fits-all solution, these are just a few of the available options, which may not be apropriate for your situation.

Thanks for reminding me, I really need to put this into practice, so much great stuff in here. The point of using inotify is that you don’t need to poll, because the kernel send your process reliable events instead over a file handle. Those events can be received either in a simple blocking style by letting poll 2 wake-up your process. Some file operations can be atomics renaming a file.

Beej’s Guide to Unix IPC () | Hacker News

Also, note these counters also function as total counts of items written and so each reader cand determine how far ahead the writer is. Perhaps exchanging your jobs with one another might help.

I think there is a gap in the Linux APIs in this area. I think we humans just need change every now and then. Something I’ve struggled to implement on Linux is cross-process multicast notifications, where any process can post and multiple subscribed processes receive it.

The man oage inotify 7 should have an example. She’s a remarkably smart person, so I was predisposed to think “BeeJ” would know what he’s talking about and it turns out he did. Its amazing how we think the grass is greener.


I have been doing systems programming for the past 7 years and have been thinking about moving over to JS based web development for the past few months. I like blocking inotify in principle – the problem is that it just didn’t work! My use case is very simple: Data gets written to buffer.

Ha ha ha, that’s great! That’s why I like inotify in blocking mode – the call to poll is just to wake up the process I think you could just blocking-read the inotify file handle?

Beej’s Guide to Unix Interprocess Communication

I’ve printed this book out and have it sitting in a binder on my bookshelf. I would probably just wrap something generic using UNIX domain sockets up into a library and re-use that as needed.

The use of poll 2 is just a consequence of the interface using a file handle. But even before I was able to work the knowledge into my day job, nothing beats the dopamine rush of learning things that fascinate you!

Depending on your permissions requirements[1], and if you really only need a signaling flag, have you considered the filesystem? I did this for both low latency and throughput reasons. Compiler could separate the update as beeu instructions and say, increment the lower part of the value, then the upper part.

Also check out his guide to C programming [0] and his guide to network programming [1] [0] http: If we are sent to programmer ro, at least we’ll have each other.

Otherwise compilers will optimize knix access to part of buide seemingly unused variables. Writer could get pre-empted between those two instructions, so you could get this strange torn value.

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Helped me write web and other unic, a great way to learn about important technologies, providing knowledge that stays useful even if the production server runs on Node.

It’s a lot of fun and opens up a whole new world of programming! This is a total abuse of Ipd, but it’s proven to be much simpler than trying to manage a separate server. Or, as troglobit said, TIPC. Thanks for the reply. Truth be told, a significant portion of my day job is still web application stuff.

How did you go about making the switch from web to systems? I did originally use a Unix domain socket server, but that added a lot of complexity: For example, rename 2 is atomic, so you can send small data payloads by writing to a different name first. Clients see that the FIFO became readable, and that jpc represents the notification.

The main part of memory layout looks something like this: Also, you can leverage some of the guarantees provided by the kenel’s vfs layer. Only the lucky few get to hack on databases, buide and file systems for a living! For something that requires very low latency e. Here, the need for low latency dictated the design. I’ve often consulted this particular guide and the companion piece for networks as well. I owe my career to Beej. Rebroadcasting messages to allow peer-to-peer messaging would be a trivial addition.

Has it paid off with an increase in enjoyment?

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