From 178451910ee67ae226b8bdc5c01bf43ea8e5a9f8 Mon Sep 17 00:00:00 2001
From: xd009642 <danielmckenna93@gmail.com>
Date: Mon, 28 Aug 2017 10:37:42 +0100
Subject: [PATCH] Added detach function

---
 CHANGELOG.md      |  2 ++
 src/sys/ptrace.rs | 14 ++++++++++++++
 2 files changed, 16 insertions(+)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index f0aa4220bc..952bec13ad 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -22,6 +22,8 @@ This project adheres to [Semantic Versioning](http://semver.org/).
   ([#739](https://github.com/nix-rust/nix/pull/739))
 - Expose `signalfd` module on Android as well.
   ([#739](https://github.com/nix-rust/nix/pull/739))
+- Added nix::sys::ptrace::detach. 
+  ([#749](https://github.com/nix-rust/nix/pull/749))
 
 ### Changed
 - Renamed existing `ptrace` wrappers to encourage namespacing ([#692](https://github.com/nix-rust/nix/pull/692))
diff --git a/src/sys/ptrace.rs b/src/sys/ptrace.rs
index c5b880388e..64b523c3f5 100644
--- a/src/sys/ptrace.rs
+++ b/src/sys/ptrace.rs
@@ -247,6 +247,20 @@ pub fn attach(pid: Pid) -> Result<()> {
     }
 }
 
+/// Detaches the current running process, as with `ptrace(PTRACE_DETACH, ...)`
+///
+/// Detaches from the process specified in pid allowing it to run freely
+pub fn detach(pid: Pid) -> Result<()> {
+    unsafe {
+        ptrace_other(
+            Request::PTRACE_DETACH,
+            pid,
+            ptr::null_mut(),
+            ptr::null_mut()
+        ).map(|_| ())
+    }
+}
+
 /// Restart the stopped tracee process, as with `ptrace(PTRACE_CONT, ...)`
 ///
 /// Continues the execution of the process with PID `pid`, optionally