Writev

[rennergade]

Description

Fixes # (issue)

Increases performance of applications such as nginx by adding the writev() system call. Right now we only implement this for INET/TCP sockets which will call down to the native system call.

Type of change

• New feature (non-breaking change which adds functionality)

How Has This Been Tested?

Added test to rust suite
Lind test suite
nginx performance tests

Checklist:

• My code follows the style guidelines of this project
• I have commented my code, particularly in hard-to-understand areas
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• Any dependent changes have been added to a pull request and/or merged in other modules (native-client, lind-glibc, lind-project)

[Yaxuan-w]

The overall logic makes sense to me and structure is clear. LGTM!