File stunnel-listenqueue-option.patch of Package stunnel.6450

--- src/options.c
+++ src/options.c
@@ -1218,6 +1218,24 @@
         break;
     }
 
+    /* listenqueue option */
+    switch(cmd) {
+    case CMD_BEGIN:
+        section->listenqueue=SOMAXCONN;
+        break;
+    case CMD_EXEC:
+        if(strcasecmp(opt, "listenqueue"))
+            break;
+        section->listenqueue=atoi(arg);
+        return (section->listenqueue?NULL:"Bad verify level");
+    case CMD_DEFAULT:
+        s_log(LOG_NOTICE, "%-15s = %d", "listenqueue", SOMAXCONN);
+        break;
+    case CMD_HELP:
+        s_log(LOG_NOTICE, "%-15s = defines the maximum length the queue of pending connections may grow to (max SOMAXCONN)", "listenqueue");
+        break;
+    }
+
 #ifdef HAVE_OSSL_OCSP_H
 
     /* OCSP */
--- src/prototypes.h
+++ src/prototypes.h
@@ -207,6 +207,7 @@
     int timeout_close;                          /* maximum close_notify time */
     int timeout_connect;                           /* maximum connect() time */
     int timeout_idle;                        /* maximum idle connection time */
+    int listenqueue;                                       /* Listen backlog */
     enum {FAILOVER_RR, FAILOVER_PRIO} failover;         /* failover strategy */
     char *username;
 
--- src/stunnel.c
+++ src/stunnel.c
@@ -414,7 +414,7 @@
                 str_free(local_address);
                 return 1;
             }
-            if(listen(opt->fd, SOMAXCONN)) {
+            if(listen(opt->fd, opt->listenqueue)) {
                 sockerror("listen");
                 closesocket(opt->fd);
                 opt->fd=-1;