Add fcntl(F_DUPFD)

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@1995 42af7a65-404d-4744-a932-0658087f49c3

include/nuttx/fs.h

@@ -344,15 +344,9 @@ EXTERN int files_dup(FAR struct file *filep1, FAR struct file *filep2);
 
 /* fs_filedup.c **************************************************************/
 
-/* This alternative naming is used when dup could operate on both file and
- * socket descritors to avoid drawing unused socket support into the link.
- */
+/* Dupicate a file descriptor using any value greater than or equal to minfd */
 
-#if defined(CONFIG_NET) && CONFIG_NSOCKET_DESCRIPTORS > 0
-EXTERN int file_dup(int fd);
-#else
-#  define file_dup(fd)        dup(fd)
-#endif
+EXTERN int file_dup(int fd, int minfd);
 
 /* fs_filedup2.c *************************************************************/
 

include/nuttx/net.h

@@ -166,14 +166,10 @@ EXTERN int net_poll(int sockfd, struct pollfd *fds, boolean setup);
 
 /* net_dup.c *****************************************************************/
 /* The standard dup() operation redirects operations on socket descriptors to
- * this function (when both file and socket descriptors are supported)
+ * this function
  */
 
-#if CONFIG_NFILE_DESCRIPTOR > 0
-EXTERN int net_dup(int sockfd);
-#else
-#  define net_dup(sockfd) dup(sockfd)
-#endif
+EXTERN int net_dup(int sockfd, int minsd);
 
 /* net_dup2.c ****************************************************************/
 /* The standard dup2() operation redirects operations on socket descriptors to