pcntl_exec() is not supported by blackfire

Author: staabm

src/Turbo/TurboProcessRestarter.php

@@ -107,6 +107,13 @@ public static function restartIfSuitable(array $argv): void
 			// second try either
 			return;
 		}
+		if (
+			isset($_SERVER['BLACKFIRE_AGENT_SOCKET'])
+		) {
+			// pcntl_exec() is not supported by blackfire
+			// see https://support.blackfire.platform.sh/hc/en-us/articles/4843014509202-Conflicts-with-pcntl-exec-calls
+			return;
+		}
 		if (
 			!function_exists('pcntl_exec')
 			|| !function_exists('pcntl_fork')