From 4842eb83b444418ad3fe1901d645dd02224989e5 Mon Sep 17 00:00:00 2001
From: Jan Beich <jbeich@FreeBSD.org>
Date: Thu, 13 Jun 2024 12:20:14 +0000
Subject: [PATCH] helpers: make shm_open() portable after 8bcccf9f0f0f (#6471)

https://pubs.opengroup.org/onlinepubs/9699919799/functions/shm_open.html
https://man.freebsd.org/shm_open/2
https://www.man7.org/linux/man-pages/man3/shm_open.3.html
---
 src/helpers/MiscFunctions.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/helpers/MiscFunctions.cpp b/src/helpers/MiscFunctions.cpp
index b1d734c815a..346a3ffa1ce 100644
--- a/src/helpers/MiscFunctions.cpp
+++ b/src/helpers/MiscFunctions.cpp
@@ -814,7 +814,8 @@ bool envEnabled(const std::string& env) {
 }
 
 std::pair<int, std::string> openExclusiveShm() {
-    std::string name = g_pTokenManager->getRandomUUID();
+    // Only absolute paths can be shared across different shm_open() calls
+    std::string name = "/" + g_pTokenManager->getRandomUUID();
 
     for (size_t i = 0; i < 69; ++i) {
         int fd = shm_open(name.c_str(), O_RDWR | O_CREAT | O_EXCL, 0600);