ldd3_training | Examples for learning how to write linux device drivers | Learning library

 by   leos313 C Version: Current License: Non-SPDX

kandi X-RAY | ldd3_training Summary

kandi X-RAY | ldd3_training Summary

ldd3_training is a C library typically used in Tutorial, Learning, Raspberry Pi applications. ldd3_training has no bugs, it has no vulnerabilities and it has low support. However ldd3_training has a Non-SPDX License. You can download it from GitHub.

I am writing these sample codes for a personal reason: I really want to learn how to write (correctly!) Linux device drivers. Note that, in order to try all examples, you need a Linux-based OS running on a PYNQ board (or something equivalent/similar: a dual core ARM + an FPGA). [the tcl scripts to create the hw for the FPGA are coming soon. For more details, send me an email]. In order to achieve this goal, the best source/documentation is, of course, the famous Linux Device Drivers 3rd edition (a.k.a ldd3) by Jonathan Corbet, Alessandro Rubini, and Greg Kroah-Hartman. Reading the book (normally every engineering book) is not enough to deeply understand the topic: the best way is almost always to directly try what you read. This is exactly what I am doing: step by step I try to implement the new acquired concepts. The folders are divided per chapter and, in every one of them, there should be at least one example where the newly learned techniques were applied. I am sure the code it is not so clean, can be improved, it is not optimized and so on and so forth: I will try to improve my coding skills with these exercises.
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              ldd3_training has a low active ecosystem.
              It has 14 star(s) with 10 fork(s). There are 4 watchers for this library.
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              It had no major release in the last 6 months.
              ldd3_training has no issues reported. There are no pull requests.
              It has a neutral sentiment in the developer community.
              The latest version of ldd3_training is current.

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              ldd3_training has 0 bugs and 0 code smells.

            kandi-Security Security

              ldd3_training has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.
              ldd3_training code analysis shows 0 unresolved vulnerabilities.
              There are 0 security hotspots that need review.

            kandi-License License

              ldd3_training has a Non-SPDX License.
              Non-SPDX licenses can be open source with a non SPDX compliant license, or non open source licenses, and you need to review them closely before use.

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              ldd3_training releases are not available. You will need to build from source code and install.

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            Community Discussions

            Trending Discussions on ldd3_training

            QUESTION

            'echo' calls .write function INFINITE times
            Asked 2018-Feb-05 at 07:47
            Context

            I wrote a Linux device driver in which the functions read and write are implemented. The problem is with the function write, here the portion of the code:

            ...

            ANSWER

            Answered 2018-Feb-04 at 17:49

            Value returned by the kernel's .write function is interpreted as:

            • error code, if it is less than zero (<0),

            • number of bytes written, if it is more than or equal to zero (>=0)

            So, for tell user that all bytes has been written, .write function should return its count parameter.

            In case of .write function, returning zero has a little sense: every "standard" utility like echo will just call write() function again.

            Source https://stackoverflow.com/questions/48607992

            Community Discussions, Code Snippets contain sources that include Stack Exchange Network

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