commit 8bbf383316f1bb16e45b05ad6e2ba9def88ba420
Author: Tomas Korbar <tkorbar@redhat.com>
Date:   Mon May 18 14:57:39 2020 +0200

    improve sig_handler function

diff --git a/memcached.c b/memcached.c
index 3916a8c..2547305 100644
--- a/memcached.c
+++ b/memcached.c
@@ -189,7 +189,7 @@ static enum transmit_result transmit(conn *c);
  * can block the listener via a condition.
  */
 static volatile bool allow_new_conns = true;
-static bool stop_main_loop = false;
+static int stop_main_loop = NOT_STOP;
 static struct event maxconnsevent;
 static void maxconns_handler(const int fd, const short which, void *arg) {
     struct timeval t = {.tv_sec = 0, .tv_usec = 10000};
@@ -7850,8 +7850,8 @@ static void remove_pidfile(const char *pid_file) {
 }
 
 static void sig_handler(const int sig) {
+    stop_main_loop = EXIT_NORMALLY;
     printf("Signal handled: %s.\n", strsignal(sig));
-    exit(EXIT_SUCCESS);
 }
 
 static void sighup_handler(const int sig) {
@@ -7860,7 +7860,7 @@ static void sighup_handler(const int sig) {
 
 static void sig_usrhandler(const int sig) {
     printf("Graceful shutdown signal handled: %s.\n", strsignal(sig));
-    stop_main_loop = true;
+    stop_main_loop = GRACE_STOP;
 }
 
 #ifndef HAVE_SIGIGNORE
@@ -9839,7 +9839,18 @@ int main (int argc, char **argv) {
         }
     }
 
-    fprintf(stderr, "Gracefully stopping\n");
+    switch (stop_main_loop) {
+        case GRACE_STOP:
+            fprintf(stderr, "Gracefully stopping\n");
+        break;
+        case EXIT_NORMALLY:
+            fprintf(stderr, "Exiting normally\n");
+        break;
+        default:
+            fprintf(stderr, "Exiting on error\n");
+        break;
+    }
+
     stop_threads();
     int i;
     // FIXME: make a function callable from threads.c
@@ -9848,7 +9859,7 @@ int main (int argc, char **argv) {
             conn_close(conns[i]);
         }
     }
-    if (memory_file != NULL) {
+    if (memory_file != NULL && stop_main_loop == GRACE_STOP) {
         restart_mmap_close();
     }
 
diff --git a/memcached.h b/memcached.h
index 77f52aa..795ea8f 100644
--- a/memcached.h
+++ b/memcached.h
@@ -236,6 +236,12 @@ enum pause_thread_types {
     RESUME_WORKER_THREADS
 };
 
+enum stop_reasons {
+    NOT_STOP,
+    GRACE_STOP,
+    EXIT_NORMALLY
+};
+
 #define IS_TCP(x) (x == tcp_transport)
 #define IS_UDP(x) (x == udp_transport)