port/linux: make non-block shutdown read descriptor

the iotivity-lite hangs in read of shutdown descriptor.
so this fix it.

port/linux/ipadapter.c

@@ -16,6 +16,7 @@
 
 #define _GNU_SOURCE
 #include "ipcontext.h"
+#include "ipadapter.h"
 #ifdef OC_TCP
 #include "tcpadapter.h"
 #endif
@@ -40,6 +41,7 @@
 #include <sys/select.h>
 #include <sys/un.h>
 #include <unistd.h>
+#include <fcntl.h>
 
 /* Some outdated toolchains do not define IFA_FLAGS.
    Note: Requires Linux kernel 3.14 or later. */
@@ -1404,6 +1406,10 @@ oc_connectivity_init(size_t device)
     OC_ERR("shutdown pipe: %d", errno);
     return -1;
   }
+  if (set_nonblock_socket(dev->shutdown_pipe[0]) < 0) {
+    OC_ERR("Could not set non-block shutdown_pipe[0]");
+    return -1;
+  }
 
   memset(&dev->mcast, 0, sizeof(struct sockaddr_storage));
   memset(&dev->server, 0, sizeof(struct sockaddr_storage));
@@ -1792,3 +1798,13 @@ oc_dns_lookup(const char *domain, oc_string_t *addr, enum transport_flags flags)
   return ret;
 }
 #endif /* OC_DNS_LOOKUP */
+
+int
+set_nonblock_socket(int sockfd) {
+  int flags = fcntl(sockfd, F_GETFL, 0);
+  if (flags < 0) {
+    return -1;
+  }
+
+  return fcntl(sockfd, F_SETFL, flags | O_NONBLOCK);
+}
\ No newline at end of file

port/linux/ipadapter.h

+/****************************************************************************
+ *
+ * Copyright 2019 Jozef Kralik All Rights Reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ ******************************************************************/
+#ifndef IPADAPTER_H
+#define IPADAPTER_H
+
+int set_nonblock_socket(int sockfd);
+
+#endif /* IPADAPTER_H */
\ No newline at end of file

port/linux/tcpadapter.c

@@ -18,6 +18,7 @@
 
 #define __USE_GNU
 
+#include "ipadapter.h"
 #include "tcpadapter.h"
 #include "api/oc_session_events_internal.h"
 #include "ipcontext.h"
@@ -690,16 +691,6 @@ tcp_connectivity_ipv4_init(ip_context_t *dev)
 }
 #endif /* OC_IPV4 */
 
-static int
-set_nonblock_socket(int sockfd) {
-  int flags = fcntl(sockfd, F_GETFL, 0);
-  if (flags < 0) {
-    return -1;
-  }
-
-  return fcntl(sockfd, F_SETFL, flags | O_NONBLOCK);
-}
-
 int
 oc_tcp_connectivity_init(ip_context_t *dev)
 {