While load testing my HTTP web server written with SwiftNIO, I noticed
that one file descriptor is leaked per request.
Steps to reproduce:
1. ...
2. ...
3. ...
4. ...
$ swift --version
Swift version 4.0.2 (swift-4.0.2-RELEASE)
Target: x86_64-unknown-linux-gnu
Operating system: Ubuntu Linux 16.04 64-bit
$ uname -a
Linux beefy.machine 4.4.0-101-generic #124-Ubuntu SMP Fri Nov 10 18:29:59 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux
My system has IPv6 disabled.
```
## Writing a Patch
A good SwiftNIO patch is:
1. Concise, and contains as few changes as needed to achieve the end result.
2. Tested, ensuring that any tests provided failed before the patch and pass after it.
3. Documented, adding API documentation as needed to cover new functions and properties.
4. Accompanied by a great commit message, using our commit message template.
### Commit Message Template
We require that your commit messages match our template. The easiest way to do that is to get git to help you by explicitly using the template. To do that, `cd` to the root of our repository and run:
SwiftNIO uses XCTest to run tests on both macOS and Linux. While the macOS version of XCTest is able to use the Objective-C runtime to discover tests at execution time, the Linux version is not.
For this reason, whenever you add new tests **you have to run a script** that generates the hooks needed to run those tests on Linux, or our CI will complain that the tests are not all present on Linux. To do this, merely execute `ruby ./scripts/generate_linux_tests.rb` at the root of the package and check the changes it made.