From c03edff16b03816ded3cd6916b16636e8ab5a8ab Mon Sep 17 00:00:00 2001
From: Jiacheng Guo <gjc@google.com>
Date: Tue, 24 Mar 2020 14:28:54 +0800
Subject: [PATCH] [posix] add platformNetifDeinit (#4726)

Close netif file descriptors to re-open after reset.
---
 src/posix/platform/netif.cpp        | 23 +++++++++++++++++++++++
 src/posix/platform/platform-posix.h |  6 ++++++
 src/posix/platform/system.cpp       |  3 +++
 3 files changed, 32 insertions(+)

diff --git a/src/posix/platform/netif.cpp b/src/posix/platform/netif.cpp
index d88d12bad..1cdbe6d1d 100644
--- a/src/posix/platform/netif.cpp
+++ b/src/posix/platform/netif.cpp
@@ -384,6 +384,29 @@ exit:
     return;
 }
 
+void platformNetifDeinit(void)
+{
+    if (sTunFd != -1)
+    {
+        close(sTunFd);
+        sTunFd = -1;
+    }
+
+    if (sIpFd != -1)
+    {
+        close(sIpFd);
+        sIpFd = -1;
+    }
+
+    if (sNetlinkFd != -1)
+    {
+        close(sNetlinkFd);
+        sNetlinkFd = -1;
+    }
+
+    sTunIndex = 0;
+}
+
 void platformNetifInit(otInstance *aInstance, const char *aInterfaceName)
 {
     struct ifreq ifr;
diff --git a/src/posix/platform/platform-posix.h b/src/posix/platform/platform-posix.h
index 343a9f60d..652c34a8c 100644
--- a/src/posix/platform/platform-posix.h
+++ b/src/posix/platform/platform-posix.h
@@ -217,6 +217,12 @@ void platformRadioInit(const otPlatformConfig *aPlatformConfig);
  */
 void platformRadioDeinit(void);
 
+/**
+ * This function shuts down platform network interface.
+ *
+ */
+void platformNetifDeinit(void);
+
 /**
  * This function inputs a received radio frame.
  *
diff --git a/src/posix/platform/system.cpp b/src/posix/platform/system.cpp
index 8d85d7cc4..d9ed6888d 100644
--- a/src/posix/platform/system.cpp
+++ b/src/posix/platform/system.cpp
@@ -73,6 +73,9 @@ void otSysDeinit(void)
     virtualTimeDeinit();
 #endif
     platformRadioDeinit();
+#if OPENTHREAD_CONFIG_PLATFORM_NETIF_ENABLE
+    platformNetifDeinit();
+#endif
 }
 
 #if OPENTHREAD_POSIX_VIRTUAL_TIME