fix dead forked pthread_fork children

frankenphp.c

@@ -87,6 +87,11 @@ __thread uintptr_t thread_index;
 __thread bool is_worker_thread = false;
 __thread HashTable *sandboxed_env = NULL;
 
+#ifndef PHP_WIN32
+static bool is_forked_child = false;
+static void frankenphp_fork_child(void) { is_forked_child = true; }
+#endif
+
 void frankenphp_update_local_thread_context(bool is_worker) {
   is_worker_thread = is_worker;
 
@@ -602,6 +607,11 @@ PHP_FUNCTION(frankenphp_handle_request) {
   }
 
   frankenphp_worker_request_shutdown();
+#ifndef PHP_WIN32
+  if (is_forked_child) {
+    _exit(0);
+  }
+#endif
   go_frankenphp_finish_worker_request(thread_index, callback_ret);
   if (result.r1 != NULL) {
     zval_ptr_dtor(result.r1);
@@ -699,6 +709,9 @@ PHP_FUNCTION(frankenphp_log) {
 
 PHP_MINIT_FUNCTION(frankenphp) {
   register_frankenphp_symbols(module_number);
+#ifndef PHP_WIN32
+  pthread_atfork(NULL, NULL, frankenphp_fork_child);
+#endif
 
   zend_function *func;
 
@@ -1098,6 +1111,11 @@ static void *php_thread(void *arg) {
       /* shutdown the request, potential bailout to zend_catch */
       php_request_shutdown((void *)0);
       frankenphp_free_request_context();
+#ifndef PHP_WIN32
+      if (is_forked_child) {
+        _exit(EG(exit_status));
+      }
+#endif
       go_frankenphp_after_script_execution(thread_index, EG(exit_status));
     }
   }
@@ -1121,6 +1139,11 @@ static void *php_thread(void *arg) {
       PG(last_error_file) = NULL;
     }
     frankenphp_free_request_context();
+#ifndef PHP_WIN32
+    if (is_forked_child) {
+      _exit(EG(exit_status));
+    }
+#endif
     go_frankenphp_after_script_execution(thread_index, EG(exit_status));
   }
   zend_end_try();