[Process] Fix silencing wait when using a sigchild-enabled binary

nicolas-grekas · nicolas-grekas · commit 3e66f7701552 · 2023-08-07T11:52:08.000+02:00
diff --git a/src/Symfony/Component/Process/Process.php b/src/Symfony/Component/Process/Process.php
@@ -331,7 +331,7 @@ public function start(callable $callback = null, array $env = [])
 
             // See https://unix.stackexchange.com/questions/71205/background-process-pipe-input
             $commandline = '{ ('.$commandline.') <&3 3<&- 3>/dev/null & } 3<&0;';
-            $commandline .= 'pid=$!; echo $pid >&3; wait $pid; code=$?; echo $code >&3; exit $code';
+            $commandline .= 'pid=$!; echo $pid >&3; wait $pid 2>/dev/null; code=$?; echo $code >&3; exit $code';
 
             // Workaround for the bug, when PTS functionality is enabled.
             // @see : https://bugs.php.net/69442
