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# Hacking
This document describes how to start hacking on the libjaylink project.
Make sure you read through the README.md file before continuing.
## Coding style
This project uses the Linux kernel coding style where appropiate, see
<https://www.kernel.org/doc/Documentation/CodingStyle> for details.
Amendments to the Linux kernel coding style:
- Do not use goto statements.
- Always declare variables at the beginng of a function.
- Do not assign values to variables at declaration time.
## Contributions
The following ways can be used to submit a contribution to the libjaylink
project:
- Send patches generated with `git format-patch`.
- Push your changes to a public Git repository and send the URL where to pull
them from.
In any case, send directly to <dev@zapb.de>.
Before submitting, please consider the following:
- Every single patch must be compilable.
- Your contribution must work on all operating systems supported by
libjaylink.
- Develop your contribution against the current Git master branch.
- Check your contribution for memory leaks and similar errors by using
*valgrind*.
## Bug reports
Send bug reports directly to <dev@zapb.de>.
Please try to include all of the following information in your report:
- Instructions to reproduce the bug (e.g., command-line invocations)
- Debug log output of libjaylink
- Information about your environment:
- Version of libjaylink
- Debug hardware, including hardware and firmware version (e.g.,
J-Link Ultra V4 compiled Sep 4 2015 18:12:49)
- Operating system (e.g., Debian GNU/Linux 8.4)
- Backtraces if the application using libjaylink is crashing.
If the bug report is for a regression, additionally include the information
above about the working version where appropiate.
Please develop and attach a patch that solves the reported bug, if possible.
See the guidelines for contributions above.
## Random notes
- Always use `log_err()`, `log_warn()`, `log_info()` and `log_dbg()` to output
messages. Never use `printf()` or similar functions directly.
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