From 8aa7288db4e947849fe614cef9bac61c17a1c47a Mon Sep 17 00:00:00 2001
From: Shane da Silva <shane@dasilva.io>
Date: Tue, 4 Jun 2019 13:10:43 -0400
Subject: [PATCH] Fix ChildProcess::Unix::Process#wait method with leader
 processes

Issue #151 reported a problem where in the update from Ruby 2.5 to Ruby
2.6 some programs would block forever on a `Process.waitpid2` call.

Changing the call to pass in a positive PID instead of the negative PID
fixes the issue as it will call the `waitpid` system call right away
instead of delaying it for later.

See #151 for further discussion of the possible reasons for the
behavior.
---
 lib/childprocess/unix/process.rb | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/lib/childprocess/unix/process.rb b/lib/childprocess/unix/process.rb
index bae5ecd..5b72a59 100644
--- a/lib/childprocess/unix/process.rb
+++ b/lib/childprocess/unix/process.rb
@@ -50,7 +50,8 @@ def wait
         if exited?
           exit_code
         else
-          _, status = ::Process.waitpid2 _pid
+          _, status = ::Process.waitpid2(@pid)
+
           set_exit_code(status)
         end
       end