[core] fixed bug with endless loop on master accept;

include/sxmp/limits.h

@@ -41,4 +41,6 @@
 
 #define MAX_LINKS  32768
 
+#define MAX_SXMP_SYNC_ITERATIONS  6
+
 #endif /* __SXMP_LIMITS_H__ */

lib/sxmplv2.c

@@ -986,6 +986,7 @@ sxlink_t *sxlink_master_accept(sxhub_t *hub, int sck, struct in_addr *addr)
   }
   bbuf = (char *)buf;
   bbuf += sizeof(sxmplv2_head_t);
+  i = 0;
 
   while(link->flags & SXMP_BATCHMODE) {
     rd = __conn_read(link, buf, sizeof(sxmplv2_head_t));
@@ -995,11 +996,18 @@ sxlink_t *sxlink_master_accept(sxhub_t *hub, int sck, struct in_addr *addr)
       /* check for returns */
       if(head->opcode != SXE_SUCCESS) { r = head->opcode; goto __fail3; }
       else { /* opcode is fine */
+        i++;
         /* if we're ready for messaging mode, turn off batch mode */
         if(link->flags & SXMP_MESSAGINGMODE) {
           link->flags &= ~SXMP_BATCHMODE;
           break;
         }
+
+        /* if count too big - fail */
+        if(i > MAX_SXMP_SYNC_ITERATIONS) { /* ugly */
+          r = SXE_FAILED;
+          goto __fail3;
+        }
       }
 
       if(!head->payload_length) continue; /* pass the following check up */