diff --git a/fs/vfs/fs_fcntl.c b/fs/vfs/fs_fcntl.c
index 67ebd617642..d75847d1cb9 100644
--- a/fs/vfs/fs_fcntl.c
+++ b/fs/vfs/fs_fcntl.c
@@ -214,6 +214,46 @@ int file_vfcntl(FAR struct file *filep, int cmd, va_list ap)
 }
 #endif /* CONFIG_NFILE_DESCRIPTORS > 0 */
 
+/****************************************************************************
+ * Name: file_fcntl
+ *
+ * Description:
+ *   Similar to the standard fcntl function except that is accepts a struct
+ *   struct file instance instead of a file descriptor.
+ *
+ * Input Parameters:
+ *   filep - Instance for struct file for the opened file.
+ *   cmd   - Identifies the operation to be performed.  Command specific
+ *           arguments may follow.
+ *
+ * Returned Value:
+ *   The nature of the return value depends on the command.  Non-negative
+ *   values indicate success.  Failures are reported as negated errno
+ *   values.
+ *
+ ****************************************************************************/
+
+#if CONFIG_NFILE_DESCRIPTORS > 0
+int file_fcntl(FAR struct file *filep, int cmd, ...)
+{
+  va_list ap;
+  int ret;
+
+  /* Setup to access the variable argument list */
+
+  va_start(ap, cmd);
+
+  /* Let file_vfcntl() do the real work.  The errno is not set on
+   * failures.
+   */
+
+  ret = file_vfcntl(filep, cmd, ap);
+
+  va_end(ap);
+  return ret;
+}
+#endif
+
 /****************************************************************************
  * Name: fcntl
  *
diff --git a/include/nuttx/fs/fs.h b/include/nuttx/fs/fs.h
index 4b059d23d99..79d3b68a8f4 100644
--- a/include/nuttx/fs/fs.h
+++ b/include/nuttx/fs/fs.h
@@ -1085,6 +1085,29 @@ int file_ioctl(FAR struct file *filep, int req, unsigned long arg);
 int file_vfcntl(FAR struct file *filep, int cmd, va_list ap);
 #endif
 
+/****************************************************************************
+ * Name: file_fcntl
+ *
+ * Description:
+ *   Similar to the standard fcntl function except that is accepts a struct
+ *   struct file instance instead of a file descriptor.
+ *
+ * Input Parameters:
+ *   filep - Instance for struct file for the opened file.
+ *   cmd   - Identifies the operation to be performed.  Command specific
+ *           arguments may follow.
+ *
+ * Returned Value:
+ *   The nature of the return value depends on the command.  Non-negative
+ *   values indicate success.  Failures are reported as negated errno
+ *   values.
+ *
+ ****************************************************************************/
+
+#if CONFIG_NFILE_DESCRIPTORS > 0
+int file_fcntl(FAR struct file *filep, int cmd, ...);
+#endif
+
 /****************************************************************************
  * Name: file_poll
  *
diff --git a/include/nuttx/net/net.h b/include/nuttx/net/net.h
index c87b0392798..aae344196ef 100644
--- a/include/nuttx/net/net.h
+++ b/include/nuttx/net/net.h
@@ -1224,6 +1224,23 @@ struct pollfd; /* Forward reference -- see poll.h */
 int net_poll(int sockfd, struct pollfd *fds, bool setup);
 #endif
 
+/****************************************************************************
+ * Name: psock_dupsd
+ *
+ * Description:
+ *   Clone a socket descriptor to an arbitray descriptor number.  If file
+ *   descriptors are implemented, then this is called by dup() for the case
+ *   of socket file descriptors.  If file descriptors are not implemented,
+ *   then this function IS dup().
+ *
+ * Returned Value:
+ *   On success, returns the number of characters sent.  On any error,
+ *   a negated errno value is returned:.
+ *
+ ****************************************************************************/
+
+int psock_dupsd(FAR struct socket *psock, int minsd);
+
 /****************************************************************************
  * Name: net_dupsd
  *
@@ -1355,6 +1372,46 @@ struct file;
 ssize_t net_sendfile(int outfd, struct file *infile, off_t *offset, size_t count);
 #endif
 
+/****************************************************************************
+ * Name: psock_vfcntl
+ *
+ * Description:
+ *   Performs fcntl operations on socket
+ *
+ * Input Parameters:
+ *   psock - An instance of the internal socket structure.
+ *   cmd   - The fcntl command.
+ *   ap    - Command-specific arguments
+ *
+ * Returned Value:
+ *   Zero (OK) is returned on success; a negated errno value is returned on
+ *   any failure to indicate the nature of the failure.
+ *
+ ****************************************************************************/
+
+int psock_vfcntl(FAR struct socket *psock, int cmd, va_list ap);
+
+/****************************************************************************
+ * Name: psock_fcntl
+ *
+ * Description:
+ *   Similar to the standard fcntl function except that is accepts a struct
+ *   struct socket instance instead of a file descriptor.
+ *
+ * Input Parameters:
+ *   psock - An instance of the internal socket structure.
+ *   cmd   - Identifies the operation to be performed.  Command specific
+ *           arguments may follow.
+ *
+ * Returned Value:
+ *   The nature of the return value depends on the command.  Non-negative
+ *   values indicate success.  Failures are reported as negated errno
+ *   values.
+ *
+ ****************************************************************************/
+
+int psock_fcntl(FAR struct socket *psock, int cmd, ...);
+
 /****************************************************************************
  * Name: net_vfcntl
  *
diff --git a/net/socket/net_dupsd.c b/net/socket/net_dupsd.c
index 02e4a1da0f8..d9604a00ac3 100644
--- a/net/socket/net_dupsd.c
+++ b/net/socket/net_dupsd.c
@@ -53,7 +53,7 @@
  ****************************************************************************/
 
 /****************************************************************************
- * Name: net_dupsd
+ * Name: psock_dupsd
  *
  * Description:
  *   Clone a socket descriptor to an arbitrary descriptor number.  If file
@@ -67,9 +67,8 @@
  *
  ****************************************************************************/
 
-int net_dupsd(int sockfd, int minsd)
+int psock_dupsd(FAR struct socket *psock, int minsd)
 {
-  FAR struct socket *psock1;
   FAR struct socket *psock2;
   int sockfd2;
   int ret;
@@ -94,13 +93,9 @@ int net_dupsd(int sockfd, int minsd)
 
   sched_lock();
 
-  /* Get the socket structure underlying sockfd */
-
-  psock1 = sockfd_socket(sockfd);
-
   /* Verify that the sockfd corresponds to valid, allocated socket */
 
-  if (!psock1 || psock1->s_crefs <= 0)
+  if (!psock || psock->s_crefs <= 0)
     {
       ret = -EBADF;
       goto errout;
@@ -126,7 +121,7 @@ int net_dupsd(int sockfd, int minsd)
 
   /* Duplicate the socket state */
 
-  ret = net_clone(psock1, psock2);
+  ret = net_clone(psock, psock2);
   if (ret < 0)
     {
       goto errout_with_sockfd;
@@ -143,4 +138,24 @@ errout:
   return ret;
 }
 
+/****************************************************************************
+ * Name: net_dupsd
+ *
+ * Description:
+ *   Clone a socket descriptor to an arbitrary descriptor number.  If file
+ *   descriptors are implemented, then this is called by dup() for the case
+ *   of socket file descriptors.  If file descriptors are not implemented,
+ *   then this function IS dup().
+ *
+ * Returned Value:
+ *   On success, returns the number of characters sent.  On any error,
+ *   a negated errno value is returned:.
+ *
+ ****************************************************************************/
+
+int net_dupsd(int sockfd, int minsd)
+{
+  return psock_dupsd(sockfd_socket(sockfd), minsd);
+}
+
 #endif /* defined(CONFIG_NET) && CONFIG_NSOCKET_DESCRIPTORS > 0 */
diff --git a/net/socket/net_vfcntl.c b/net/socket/net_vfcntl.c
index a65862aa697..51faaca58de 100644
--- a/net/socket/net_vfcntl.c
+++ b/net/socket/net_vfcntl.c
@@ -59,15 +59,15 @@
  ****************************************************************************/
 
 /****************************************************************************
- * Name: net_vfcntl
+ * Name: psock_vfcntl
  *
  * Description:
  *   Performs fcntl operations on socket
  *
  * Input Parameters:
- *   sockfd - Socket descriptor of the socket to operate on
- *   cmd    - The fcntl command.
- *   ap     - Command-specific arguments
+ *   psock - An instance of the internal socket structure.
+ *   cmd   - The fcntl command.
+ *   ap    - Command-specific arguments
  *
  * Returned Value:
  *   Zero (OK) is returned on success; a negated errno value is returned on
@@ -75,12 +75,11 @@
  *
  ****************************************************************************/
 
-int net_vfcntl(int sockfd, int cmd, va_list ap)
+int psock_vfcntl(FAR struct socket *psock, int cmd, va_list ap)
 {
-  FAR struct socket *psock = sockfd_socket(sockfd);
   int ret = -EINVAL;
 
-  ninfo("sockfd=%d cmd=%d\n", sockfd, cmd);
+  ninfo("sockfd=%p cmd=%d\n", psock, cmd);
 
   /* Verify that the sockfd corresponds to valid, allocated socket */
 
@@ -108,7 +107,7 @@ int net_vfcntl(int sockfd, int cmd, va_list ap)
         {
           /* Does not set the errno value on failure */
 
-          ret = net_dupsd(sockfd, va_arg(ap, int));
+          ret = psock_dupsd(psock, va_arg(ap, int));
         }
         break;
 
@@ -259,4 +258,64 @@ int net_vfcntl(int sockfd, int cmd, va_list ap)
   return ret;
 }
 
+/****************************************************************************
+ * Name: psock_fcntl
+ *
+ * Description:
+ *   Similar to the standard fcntl function except that is accepts a struct
+ *   struct socket instance instead of a file descriptor.
+ *
+ * Input Parameters:
+ *   psock - An instance of the internal socket structure.
+ *   cmd   - Identifies the operation to be performed.  Command specific
+ *           arguments may follow.
+ *
+ * Returned Value:
+ *   The nature of the return value depends on the command.  Non-negative
+ *   values indicate success.  Failures are reported as negated errno
+ *   values.
+ *
+ ****************************************************************************/
+
+int psock_fcntl(FAR struct socket *psock, int cmd, ...)
+{
+  va_list ap;
+  int ret;
+
+  /* Setup to access the variable argument list */
+
+  va_start(ap, cmd);
+
+  /* Let psock_vfcntl() do the real work.  The errno is not set on
+   * failures.
+   */
+
+  ret = psock_vfcntl(psock, cmd, ap);
+
+  va_end(ap);
+  return ret;
+}
+
+/****************************************************************************
+ * Name: net_vfcntl
+ *
+ * Description:
+ *   Performs fcntl operations on socket
+ *
+ * Input Parameters:
+ *   sockfd - Socket descriptor of the socket to operate on
+ *   cmd    - The fcntl command.
+ *   ap     - Command-specific arguments
+ *
+ * Returned Value:
+ *   Zero (OK) is returned on success; a negated errno value is returned on
+ *   any failure to indicate the nature of the failure.
+ *
+ ****************************************************************************/
+
+int net_vfcntl(int sockfd, int cmd, va_list ap)
+{
+  return psock_vfcntl(sockfd_socket(sockfd), cmd, ap);
+}
+
 #endif /* CONFIG_NET && CONFIG_NSOCKET_DESCRIPTORS > 0 */