lua: avoid tarantool console quit if sigint signal sending

Tarantool console quits if you type Ctrl+C.

This patch fixes console behavior on typing Ctrl+C. The patch is intended to make user experience of using tarantool console better.

Relates to #2717

src/main.cc

@@ -84,6 +84,7 @@
 #include "ssl_cert_paths_discover.h"
 #include "core/errinj.h"
 
+
 static pid_t master_pid = getpid();
 static struct pidfh *pid_file_handle;
 static char *script = NULL;
@@ -173,11 +174,31 @@ signal_cb(ev_loop *loop, struct ev_signal *w, int revents)
 	 * a bug that the server suddenly died. Make such case
 	 * explicit in the log.
 	 */
+
 	if (pid_file)
 		say_crit("got signal %d - %s", w->signum, strsignal(w->signum));
 	tarantool_exit(0);
 }
 
+static void
+signal_int_cb(ev_loop *loop, struct ev_signal *w, int revents)
+{
+    (void) loop;
+    (void) w;
+    (void) revents;
+
+    if (pid_file)
+        say_crit("got signal %d - %s", w->signum, strsignal(w->signum));
+
+    /* Regenerate the prompt on a newline. */
+    printf("\n");
+    rl_on_new_line();
+
+    /* Clear the previous text. */
+    rl_replace_line("", 0);
+    rl_redisplay();
+}
+
 static void
 signal_sigwinch_cb(ev_loop *loop, struct ev_signal *w, int revents)
 {
@@ -251,7 +272,7 @@ signal_init(void)
 	crash_signal_init();
 
 	ev_signal_init(&ev_sigs[0], sig_checkpoint, SIGUSR1);
-	ev_signal_init(&ev_sigs[1], signal_cb, SIGINT);
+	ev_signal_init(&ev_sigs[1], signal_int_cb, SIGINT);
 	ev_signal_init(&ev_sigs[2], signal_cb, SIGTERM);
 	ev_signal_init(&ev_sigs[3], signal_sigwinch_cb, SIGWINCH);
 	ev_signal_init(&ev_sigs[4], say_logrotate, SIGHUP);

test/app-tap/gh-2717-no-quit-sigint.test.lua

@@ -0,0 +1,37 @@
+#!/usr/bin/env tarantool
+
+local fiber = require('fiber')
+local tap = require('tap')
+local popen = require('popen')
+local process_timeout = require('process_timeout')
+
+--
+-- gh-2717: tarantool quit on sigint
+--
+
+local TARANTOOL_PATH = arg[-1]
+
+local res = tap.test('gh-2717', function(test)
+    test:plan(1)
+    local n = 2
+    local prompt = "tarantool>"
+    local ph = popen.shell(TARANTOOL_PATH .. " -i", 'r')
+    assert(ph.pid, "popen error while executing" .. TARANTOOL_PATH)
+
+    local res = "tarantool> \n"
+    for i = 1, n do
+        fiber.sleep(0.5)
+        ph:signal(popen.signal.SIGINT)
+        fiber.sleep(0.5)
+
+        res = res .. "tarantool> \n"
+    end
+        local output = ph:read()
+        assert(process_timeout.process_is_alive(ph.pid), " process stopped by SIGINT")
+
+    ph:close()
+    print(output)
+
+    test:like(output, prompt .. " \n" .. prompt, " SIGINT doesn't kill the process ")
+end)
+os.exit(res and 0 or 1)