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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Even when the problems and tools we use to solve those problems never change, we still somehow get upset with the tools or the problems. Truth be told, a significant portion of my day job is still unid application stuff.

Compiler could separate the update as multiple instructions t say, increment the lower part of the value, then the upper part. Something I’ve struggled to implement on Linux is cross-process multicast notifications, where any process can post and multiple subscribed processes receive it.

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. Clients see that the FIFO became readable, and that change represents the notification.


Beej’s Guide to Unix Interprocess Communication

A colleague wrote up a blog post about the various alternatives that were evaluated before settling on that approach: The main part of memory layout looks something like this: Then it works like this: Making a group specific to the message sending can help.

This has an advantage of centralizing any messaging complexity and lets you manage any multi-message state easily. Also, note these counters also function as total counts of items written and so each reader cand determine how far ahead the writer is. 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.

Beej’s Guide to Unix IPC

I’ve often consulted this particular guide and the companion piece for networks as well. Those events can be received either in a simple blocking style by letting poll 2 wake-up your process. I quite enjoy programming in C, so hopefully that helps. I did originally use a Unix domain socket server, but that added a lot of complexity: If drops are fine, TIPC is probably overkill.

I thought Posix IPC is “better” these days? My new solution on Linux is a total hack: Thank you for this thoughtful reply. I’ve never heard of TIPC.

Otherwise compilers will optimize away access to part of this seemingly unused variables. The use of poll 2 is just a consequence of the interface using a file handle.


What are you doing at your job now? But, you might be reading data you didn’t expect. Actually both of you are right.

I would probably just wrap something generic using UNIX domain sockets up into a library and re-use that as needed. Here, the need for low latency dictated the design.

I also explored inotify but found it to be unreliable https: There really isn’t a one-size-fits all solution. I’ve printed this book out and have it sitting in a binder on my bookshelf.

Rebroadcasting messages to allow peer-to-peer messaging would be a trivial addition. I highly recommend learning how Unix systems work. Also, you can leverage some of the vuide provided by the kenel’s vfs layer. But, armed with the knowledge of sockets, processes, etc.

From a little searching it looks like it’s very capable but geared towards clusters, and is overkill for my use case.

veej My use case is very simple: 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.