openresty/patches/nginx-1.21.4-single_process_graceful_exit.patch

diff --git a/src/os/unix/ngx_process.c b/src/os/unix/ngx_process.c
index 15680237..12a8c687 100644
--- a/src/os/unix/ngx_process.c
+++ b/src/os/unix/ngx_process.c
@@ -362,8 +362,15 @@ ngx_signal_handler(int signo, siginfo_t *siginfo, void *ucontext)
             break;
 
         case ngx_signal_value(NGX_RECONFIGURE_SIGNAL):
-            ngx_reconfigure = 1;
-            action = ", reconfiguring";
+            if (ngx_process == NGX_PROCESS_SINGLE) {
+                ngx_terminate = 1;
+                action = ", exiting";
+
+            } else {
+                ngx_reconfigure = 1;
+                action = ", reconfiguring";
+            }
+
             break;
 
         case ngx_signal_value(NGX_REOPEN_SIGNAL):
diff --git a/src/os/unix/ngx_process_cycle.c b/src/os/unix/ngx_process_cycle.c
index 5817a2c2..f3d58e97 100644
--- a/src/os/unix/ngx_process_cycle.c
+++ b/src/os/unix/ngx_process_cycle.c
@@ -305,11 +305,26 @@ ngx_single_process_cycle(ngx_cycle_t *cycle)
     }
 
     for ( ;; ) {
+        if (ngx_exiting) {
+            if (ngx_event_no_timers_left() == NGX_OK) {
+                ngx_log_error(NGX_LOG_NOTICE, cycle->log, 0, "exiting");
+
+                for (i = 0; cycle->modules[i]; i++) {
+                    if (cycle->modules[i]->exit_process) {
+                        cycle->modules[i]->exit_process(cycle);
+                    }
+                }
+
+                ngx_master_process_exit(cycle);
+            }
+        }
+
         ngx_log_debug0(NGX_LOG_DEBUG_EVENT, cycle->log, 0, "worker cycle");
 
         ngx_process_events_and_timers(cycle);
 
-        if (ngx_terminate || ngx_quit) {
+        if (ngx_terminate) {
+            ngx_log_error(NGX_LOG_NOTICE, cycle->log, 0, "exiting");
 
             for (i = 0; cycle->modules[i]; i++) {
                 if (cycle->modules[i]->exit_process) {
@@ -320,6 +335,20 @@ ngx_single_process_cycle(ngx_cycle_t *cycle)
             ngx_master_process_exit(cycle);
         }
 
+        if (ngx_quit) {
+            ngx_quit = 0;
+            ngx_log_error(NGX_LOG_NOTICE, cycle->log, 0,
+                          "gracefully shutting down");
+            ngx_setproctitle("process is shutting down");
+
+            if (!ngx_exiting) {
+                ngx_exiting = 1;
+                ngx_set_shutdown_timer(cycle);
+                ngx_close_listening_sockets(cycle);
+                ngx_close_idle_connections(cycle);
+            }
+        }
+
         if (ngx_reconfigure) {
             ngx_reconfigure = 0;
             ngx_log_error(NGX_LOG_NOTICE, cycle->log, 0, "reconfiguring");