console: check on_shutdown() before exit

Add check that on_shutdown() triggers were called before exit,
because in case of EOF or Ctrl+D (no signals) they were ignored.

Closes #4703

src/main.cc

@@ -902,6 +902,12 @@ main(int argc, char **argv)
 
 	if (start_loop)
 		say_crit("exiting the event loop");
+	/*
+	 * If Tarantool was stopped using Ctrl+D, then we need to
+	 * call on_shutdown triggers, because Ctrl+D  causes not
+	 * any signals.
+	 */
+	tarantool_exit(exit_code);
 	/* freeing resources */
 	tarantool_free();
 	return exit_code;

test/box/gh-4703-on_shutdown-bug.result

+-- test-run result file version 2
+env = require('test_run')
+ | ---
+ | ...
+fio = require("fio")
+ | ---
+ | ...
+test_run = env.new()
+ | ---
+ | ...
+
+--
+-- gh-4703: Make sure that on_shutdown triggers are executed after
+-- EOF.
+--
+file_name = "on_shutdown_triggered.txt"
+ | ---
+ | ...
+test_run:cmd("setopt delimiter ';'");
+ | ---
+ | - true
+ | ...
+on_shutdown_cmd = "box.ctl.on_shutdown(function() local fio = require('fio') "..
+                   "fio.open('"..file_name.."', "..
+                   "{'O_CREAT', 'O_TRUNC', 'O_WRONLY'}, 777):close() end)";
+ | ---
+ | ...
+test_run:cmd("setopt delimiter ''");
+ | ---
+ | - true
+ | ...
+server = io.popen('tarantool -i', 'w')
+ | ---
+ | ...
+server:write(on_shutdown_cmd)
+ | ---
+ | - true
+ | ...
+server:close()
+ | ---
+ | - true
+ | ...
+fio.path.lexists(file_name) == true
+ | ---
+ | - true
+ | ...
+os.remove(file_name)
+ | ---
+ | - true
+ | ...

test/box/gh-4703-on_shutdown-bug.test.lua

+env = require('test_run')
+fio = require("fio")
+test_run = env.new()
+
+--
+-- gh-4703: Make sure that on_shutdown triggers are executed after
+-- EOF.
+--
+file_name = "on_shutdown_triggered.txt"
+test_run:cmd("setopt delimiter ';'");
+on_shutdown_cmd = "box.ctl.on_shutdown(function() local fio = require('fio') "..
+                   "fio.open('"..file_name.."', "..
+                   "{'O_CREAT', 'O_TRUNC', 'O_WRONLY'}, 777):close() end)";
+test_run:cmd("setopt delimiter ''");
+server = io.popen('tarantool -i', 'w')
+server:write(on_shutdown_cmd)
+server:close()
+fio.path.lexists(file_name) == true
+os.remove(file_name)