Merge branch 'ptrace-final' into 'master'

RSoC: Implementing ptrace for Redox OS - part 8 - The finale

See merge request redox-os/website!229

content/news/rsoc-ptrace-8.md

++++
+title = "RSoC: Implementing ptrace for Redox OS - part 8 - The finale"
+author = "jD91mZM2"
+date = "2019-08-18T16:16:27+02:00"
++++
+
+# Introduction
+
+Bonjour le monde! Another week, another- hold on. It's been two
+weeks. Time flies, doesn't it? Last week I was sadly on vacation and
+couldn't devote much time to Redox, but this week I've been back!
+
+---
+
+Most of my work this week has been about GDB. I've asked around a
+little about porting Redox OS in the #gdb IRC channel on freenode, and
+had a poll about which way I should go forward: Port GDB or create my
+own GDBserver from scratch in Rust. The votes have been received, and
+the answer was:
+
+## Building a GDB server in Rust
+
+[The GDB Remote
+Protocol](https://sourceware.org/gdb/onlinedocs/gdb/Remote-Protocol.html)
+is incredibly well-documented and a pleasure to work with. GDB is
+really compatible with all kinds of targets, using new features only
+on the targets that explicitly supports them.
+
+I created the
+[gdb-protocol](https://gitlab.redox-os.org/redox-os/gdb-protocol)
+library for parsing the main structure over GDB packets and performing
+checksum verifications. The actual contents of the packets isn't
+interpreted currently. Then I started work on a "gdbserver" program
+(in rust, still) that aims to support both x86_64 Linux and Redox OS.
+
+![GDB trying its best to understand the madness that my program
+sends](https://i.imgur.com/k0Oj63q.png "GDB trying its best to
+understand the madness that my program sends")
+
+## Detect exits
+
+[The RFC now specifies
+`PTRACE_STOP_EXIT`](https://gitlab.redox-os.org/redox-os/rfcs/merge_requests/14/diffs?commit_id=f696cc7386e05938becf9745f648bd523118d50f)
+and my fork of the kernel implements it. Robert O'Callahan, programmer
+at Mozilla who works on the `rr` debugging utility suggested this
+idea, as apparently it's very useful to be able to inspect the process
+state *before* exit. Huge thanks to him for his input, it's incredibly
+valuable. I will send out a merge request for the final changes soon,
+and probably get the RFC merged.
+
+## Final round up
+
+My RSoC period will unfortunately end soon, together with the summer
+vacation from school. This means I'll be unable to create patches as
+rapidly and should spend the final few days to publish everything and
+make sure everything is somewhat working. It's been a great summer and
+I'm really happy to have gotten this opportunity again. Goodbye for
+now, everyone!