net/socket/getsockname.c: Add psock_getsockname function

include/nuttx/net/net.h

@@ -1070,6 +1070,46 @@ int psock_getsockopt(FAR struct socket *psock, int level, int option,
 int psock_setsockopt(FAR struct socket *psock, int level, int option,
                      FAR const void *value, socklen_t value_len);
 
+/****************************************************************************
+ * Name: psock_getsockname
+ *
+ * Description:
+ *   The psock_getsockname() function retrieves the locally-bound name of the
+ *   the specified socket, stores this address in the sockaddr structure pointed
+ *   to by the 'addr' argument, and stores the length of this address in the
+ *   object pointed to by the 'addrlen' argument.
+ *
+ *   If the actual length of the address is greater than the length of the
+ *   supplied sockaddr structure, the stored address will be truncated.
+ *
+ *   If the socket has not been bound to a local name, the value stored in
+ *   the object pointed to by address is unspecified.
+ *
+ * Parameters:
+ *   psock    Socket structure of socket to operate on
+ *   addr     sockaddr structure to receive data [out]
+ *   addrlen  Length of sockaddr structure [in/out]
+ *
+ * Returned Value:
+ *   On success, 0 is returned, the 'addr' argument points to the address
+ *   of the socket, and the 'addrlen' argument points to the length of the
+ *   address. Otherwise, -1 is returned and errno is set to indicate the error.
+ *   Possible errno values that may be returned include:
+ *
+ *   EBADF      - The socket argument is not a valid file descriptor.
+ *   ENOTSOCK   - The socket argument does not refer to a socket.
+ *   EOPNOTSUPP - The operation is not supported for this socket's protocol.
+ *   ENOTCONN   - The socket is not connected or otherwise has not had the
+ *                peer pre-specified.
+ *   EINVAL     - The socket has been shut down.
+ *   ENOBUFS    - Insufficient resources were available in the system to
+ *                complete the function.
+ *
+ ****************************************************************************/
+
+int psock_getsockname(FAR struct socket *psock, FAR struct sockaddr *addr,
+                      FAR socklen_t *addrlen);
+
 /****************************************************************************
  * Name: psock_getpeername
  *

net/socket/getsockname.c

@@ -56,6 +56,69 @@
  * Public Functions
  ****************************************************************************/
 
+/****************************************************************************
+ * Name: psock_getsockname
+ *
+ * Description:
+ *   The psock_getsockname() function retrieves the locally-bound name of the
+ *   specified socket, stores this address in the sockaddr structure pointed
+ *   to by the 'addr' argument, and stores the length of this address in the
+ *   object pointed to by the 'addrlen' argument.
+ *
+ *   If the actual length of the address is greater than the length of the
+ *   supplied sockaddr structure, the stored address will be truncated.
+ *
+ *   If the socket has not been bound to a local name, the value stored in
+ *   the object pointed to by address is unspecified.
+ *
+ * Parameters:
+ *   psock    Socket structure of socket to operate on
+ *   addr     sockaddr structure to receive data [out]
+ *   addrlen  Length of sockaddr structure [in/out]
+ *
+ * Returned Value:
+ *   On success, 0 is returned, the 'addr' argument points to the address
+ *   of the socket, and the 'addrlen' argument points to the length of the
+ *   address. Otherwise, -1 is returned and errno is set to indicate the error.
+ *   Possible errno values that may be returned include:
+ *
+ *   EBADF      - The socket argument is not a valid file descriptor.
+ *   ENOTSOCK   - The socket argument does not refer to a socket.
+ *   EOPNOTSUPP - The operation is not supported for this socket's protocol.
+ *   EINVAL     - The socket has been shut down.
+ *   ENOBUFS    - Insufficient resources were available in the system to
+ *                complete the function.
+ *
+ ****************************************************************************/
+
+int psock_getsockname(FAR struct socket *psock, FAR struct sockaddr *addr, FAR socklen_t *addrlen)
+{
+  /* Verify that the psock corresponds to valid, allocated socket */
+
+  if (psock == NULL || psock->s_crefs <= 0)
+    {
+      return -EBADF;
+    }
+
+  /* Some sanity checking... Shouldn't need this on a buckled up embedded
+   * system (?)
+   */
+
+#ifdef CONFIG_DEBUG_FEATURES
+  if (addr == NULL || addrlen <= 0)
+    {
+      return -EINVAL;
+    }
+#endif
+
+  /* Let the address family's send() method handle the operation */
+
+  DEBUGASSERT(psock->s_sockif != NULL &&
+              psock->s_sockif->si_getsockname != NULL);
+
+  return psock->s_sockif->si_getsockname(psock, addr, addrlen);
+}
+
 /****************************************************************************
  * Name: getsockname
  *
@@ -71,7 +134,7 @@
  *   If the socket has not been bound to a local name, the value stored in
  *   the object pointed to by address is unspecified.
  *
- * Input Parameters:
+ * Parameters:
  *   sockfd   Socket descriptor of socket [in]
  *   addr     sockaddr structure to receive data [out]
  *   addrlen  Length of sockaddr structure [in/out]
@@ -95,48 +158,17 @@ int getsockname(int sockfd, FAR struct sockaddr *addr, FAR socklen_t *addrlen)
 {
   FAR struct socket *psock = sockfd_socket(sockfd);
   int ret;
-  int errcode;
 
-  /* Verify that the sockfd corresponds to valid, allocated socket */
+  /* Let psock_getsockname() do all of the work */
-
-  if (psock == NULL || psock->s_crefs <= 0)
-    {
-      errcode = EBADF;
-      goto errout;
-    }
-
-  /* Some sanity checking... Shouldn't need this on a buckled up embedded
-   * system (?)
-   */
-
-#ifdef CONFIG_DEBUG_FEATURES
-  if (addr == NULL || addrlen <= 0)
-    {
-      errcode = EINVAL;
-      goto errout;
-    }
-#endif
-
-  /* Let the address family's send() method handle the operation */
-
-  DEBUGASSERT(psock->s_sockif != NULL &&
-              psock->s_sockif->si_getsockname != NULL);
-
-  ret = psock->s_sockif->si_getsockname(psock, addr, addrlen);
-
-  /* Check for failure */
 
+  ret = psock_getsockname(psock, addr, addrlen);
   if (ret < 0)
     {
-      errcode = -ret;
+      set_errno(-ret);
-      goto errout;
+      return ERROR;
     }
 
   return OK;
-
-errout:
-  set_errno(errcode);
-  return ERROR;
 }
 
 #endif /* CONFIG_NET */