Refactor of process management.

The process abstraction has changed to:

  setup(task, process)
  start(task, process_data)
  prefork(task, process, mp)

The prefork() occurs in the main process right before fork.

The file src/nxt_main_process.c is completely free of process
specific logic.

The creation of a process now supports a PROCESS_CREATED state.  The
The setup() function of each process can set its state to either
created or ready.  If created, a MSG_PROCESS_CREATED is sent to main
process, where external setup can be done (required for rootfs under
container).

The core processes (discovery, controller and router) doesn't need
external setup, then they all proceeds to their start() function
straight away.

In the case of applications, the load of the module happens at the
process setup() time and The module's init() function has changed
to be the start() of the process.

The module API has changed to:

  setup(task, process, conf)
  start(task, data)

As a direct benefit of the PROCESS_CREATED message, the clone(2) of
processes using pid namespaces now doesn't need to create a pipe
to make the child block until parent setup uid/gid mappings nor it
needs to receive the child pid.

1 files changed, 67 insertions, 0 deletions

diff --git a/src/nxt_signal_handlers.c b/src/nxt_signal_handlers.c
new file mode 100644
index 00000000..69ae2bc4
--- /dev/null
+++ b/src/nxt_signal_handlers.c
@@ -0,0 +1,67 @@
+
+/*
+ * Copyright (C) Igor Sysoev
+ * Copyright (C) NGINX, Inc.
+ */
+
+#include <nxt_main.h>
+#include <nxt_runtime.h>
+#include <nxt_port.h>
+#include <nxt_main_process.h>
+#include <nxt_router.h>
+
+
+static void nxt_signal_handler(nxt_task_t *task, void *obj, void *data);
+static void nxt_signal_sigterm_handler(nxt_task_t *task, void *obj, void *data);
+static void nxt_signal_sigquit_handler(nxt_task_t *task, void *obj, void *data);
+
+
+const nxt_sig_event_t  nxt_process_signals[] = {
+    nxt_event_signal(SIGHUP,  nxt_signal_handler),
+    nxt_event_signal(SIGINT,  nxt_signal_sigterm_handler),
+    nxt_event_signal(SIGQUIT, nxt_signal_sigquit_handler),
+    nxt_event_signal(SIGTERM, nxt_signal_sigterm_handler),
+    nxt_event_signal(SIGCHLD, nxt_signal_handler),
+    nxt_event_signal(SIGUSR1, nxt_signal_handler),
+    nxt_event_signal(SIGUSR2, nxt_signal_handler),
+    nxt_event_signal_end,
+};
+
+
+static void
+nxt_signal_handler(nxt_task_t *task, void *obj, void *data)
+{
+    nxt_trace(task, "signal signo:%d (%s) recevied, ignored",
+              (int) (uintptr_t) obj, data);
+}
+
+
+void
+nxt_signal_quit_handler(nxt_task_t *task, nxt_port_recv_msg_t *msg)
+{
+    nxt_process_quit(task, 0);
+}
+
+
+static void
+nxt_signal_sigterm_handler(nxt_task_t *task, void *obj, void *data)
+{
+    nxt_debug(task, "sigterm handler signo:%d (%s)",
+              (int) (uintptr_t) obj, data);
+
+    /* A fast exit. */
+
+    nxt_runtime_quit(task, 0);
+}
+
+
+static void
+nxt_signal_sigquit_handler(nxt_task_t *task, void *obj, void *data)
+{
+    nxt_debug(task, "sigquit handler signo:%d (%s)",
+              (int) (uintptr_t) obj, data);
+
+    /* A graceful exit. */
+
+    nxt_process_quit(task, 0);
+}