From 2f27a3ea73e5f5120961b17926b6759d7ce7401c Mon Sep 17 00:00:00 2001
From: lazerg <lazerg2@gmail.com>
Date: Sun, 25 Oct 2026 22:21:50 +0500
Subject: [PATCH] Fix GH-24695: FPM tester sends signal to process group when
 PID is missing

Co-authored-by: Bill Sommerfeld <sommerfeld@hamachi.org>
---
 sapi/fpm/tests/tester.inc | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/sapi/fpm/tests/tester.inc b/sapi/fpm/tests/tester.inc
index 8e67d17430a6..c98252292489 100644
--- a/sapi/fpm/tests/tester.inc
+++ b/sapi/fpm/tests/tester.inc
@@ -1119,6 +1119,9 @@ class Tester
     {
         if (is_null($pid)) {
             $pid = $this->getPid();
+            if ($pid === 0) {
+                return '';
+            }
         }
         $cmd = "kill -$signal $pid";
         $this->trace('Sending signal using command', $cmd, true);