VPP-1032: fix coverity warnings

Change-Id: Ic3a0c51e5408921051deaf2e50372d9654574b27
Signed-off-by: Dave Barach <dave@barachs.net>

src/vat/api_format.c

@@ -2137,6 +2137,7 @@ static void vl_api_memfd_segment_create_reply_t_handler
 
       vam->client_index_invalid = 1;
 
+      /* Note: this closes memfd.fd */
       retval = memfd_slave_init (&memfd);
       if (retval)
 	clib_warning ("WARNING: segment map returned %d", retval);
@@ -2152,8 +2153,6 @@ static void vl_api_memfd_segment_create_reply_t_handler
       vl_client_connect_to_vlib_no_map ("pvt",
 					"vpp_api_test(p)",
 					32 /* input_queue_length */ );
-      if (close (my_fd) < 0)
-	clib_unix_warning ("close memfd fd pivot");
       vam->vl_input_queue = am->shmem_hdr->vl_input_queue;
 
       vl_socket_client_enable_disable (&vam->socket_client_main,
@@ -20918,16 +20917,12 @@ api_app_namespace_add_del (vat_main_t * vam)
 static int
 api_memfd_segment_create (vat_main_t * vam)
 {
+#if VPP_API_TEST_BUILTIN == 0
   unformat_input_t *i = vam->input;
   vl_api_memfd_segment_create_t *mp;
   u64 size = 64 << 20;
   int ret;
 
-#if VPP_API_TEST_BUILTIN == 1
-  errmsg ("memfd_segment_create (builtin) not supported");
-  return -99;
-#endif
-
   while (unformat_check_input (i) != UNFORMAT_END_OF_INPUT)
     {
       if (unformat (i, "size %U", unformat_memory_size, &size))
@@ -20941,6 +20936,11 @@ api_memfd_segment_create (vat_main_t * vam)
   S (mp);
   W (ret);
   return ret;
+
+#else
+  errmsg ("memfd_segment_create (builtin) not supported");
+  return -99;
+#endif
 }
 
 static int

src/vnet/dns/dns.c

@@ -690,6 +690,15 @@ delete_random_entry (dns_main_t * dm)
   if (dm->is_enabled == 0)
     return VNET_API_ERROR_NAME_RESOLUTION_NOT_ENABLED;
 
+  /*
+   * Silence spurious coverity warning. We know pool_elts >> 0, or
+   * we wouldn't be here...
+   */
+#ifdef __COVERITY__
+  if (pool_elts (dm->entries) == 0)
+    return VNET_API_ERROR_UNSPECIFIED;
+#endif
+
   dns_cache_lock (dm);
   limit = pool_elts (dm->entries);
   start_index = random_u32 (&dm->random_seed) % limit;
@@ -936,8 +945,7 @@ vnet_dns_cname_indirection_nolock (dns_main_t * dm, u32 ep_index, u8 * reply)
 	  pos += len;
 	  len = *pos++;
 	}
-      qp = (dns_query_t *) pos;
-      pos += sizeof (*qp);
+      pos += sizeof (dns_query_t);
     }
   pos2 = pos;
   /* expect a pointer chase here for a CNAME record */
@@ -1122,7 +1130,7 @@ vnet_dns_response_to_reply (u8 * response,
 	      if ((pos[0] & 0xC0) == 0xC0)
 		{
 		  curpos = pos + 2;
-		  break;
+		  goto curpos_set;
 		}
 	      pos += len;
 	      len = *pos++;
@@ -1130,6 +1138,7 @@ vnet_dns_response_to_reply (u8 * response,
 	  curpos = pos;
 	}
 
+    curpos_set:
       rr = (dns_rr_t *) curpos;
 
       switch (clib_net_to_host_u16 (rr->type))

src/vppinfra/time.h

@@ -263,10 +263,12 @@ unix_usage_now (void)
 always_inline void
 unix_sleep (f64 dt)
 {
-  struct timespec t;
-  t.tv_sec = dt;
-  t.tv_nsec = 1e9 * dt;
-  nanosleep (&t, 0);
+  struct timespec ts, tsrem;
+  ts.tv_sec = dt;
+  ts.tv_nsec = 1e9 * (dt - (f64) ts.tv_sec);
+
+  while (nanosleep (&ts, &tsrem) < 0)
+    ts = tsrem;
 }
 
 #else /* ! CLIB_UNIX */