From 077d656b87abf6db4d47faf6449a377ebe3ee56a Mon Sep 17 00:00:00 2001
From: Mahmoud Al-Qudsi <mqudsi@neosmart.net>
Date: Sun, 30 Dec 2018 20:21:36 -0600
Subject: [PATCH] Allow redeclaration of main process via `setup_fork_guards()`

This is necessary for the history race condition test to succeed.

(That test is permanently disabled under WSL (as it always fails) so I
didn't catch this on my end.)
---
 src/common.cpp | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/src/common.cpp b/src/common.cpp
index 9362c69b2..94367bdac 100644
--- a/src/common.cpp
+++ b/src/common.cpp
@@ -2177,6 +2177,15 @@ bool is_forked_child() {
 }
 
 void setup_fork_guards() {
+    static bool already_initialized = false;
+
+    is_forked_proc = false;
+    if (already_initialized) {
+        // Just mark this process as main and exit
+        return;
+    }
+
+    already_initialized = true;
     pthread_atfork(nullptr, nullptr, []() {
         is_forked_proc = true;
     });