dup() and dup2() support for socket descriptors

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@1884 42af7a65-404d-4744-a932-0658087f49c3

include/net/uip/uip-tcp.h

@@ -134,6 +134,7 @@ struct uip_conn
                            * connection */
   uint16 initialmss;      /* Initial maximum segment size for the
                            * connection */
+  uint8  crefs;           /* Reference counts on this instance */
   uint8  sa;              /* Retransmission time-out calculation state
                            * variable */
   uint8  sv;              /* Retransmission time-out calculation state

include/net/uip/uip-udp.h

@@ -77,6 +77,7 @@ struct uip_udp_conn
   uint16 lport;           /* The local port number in network byte order */
   uint16 rport;           /* The remote port number in network byte order */
   uint8  ttl;             /* Default time-to-live */
+  uint8  crefs;           /* Reference counts on this instance */
 
   /* Defines the list of UDP callbacks */
 

include/nuttx/fs.h

@@ -342,6 +342,30 @@ EXTERN int files_addreflist(FAR struct filelist *list);
 EXTERN int files_releaselist(FAR struct filelist *list);
 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.
+ */
+
+#if defined(CONFIG_NET) && CONFIG_NSOCKET_DESCRIPTORS > 0
+EXTERN int file_dup(int fd);
+#else
+#  defile file_dup(fd)        dup(fd)
+#endif
+
+/* fs_filedup2.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.
+ */
+
+#if defined(CONFIG_NET) && CONFIG_NSOCKET_DESCRIPTORS > 0
+EXTERN int file_dup2(int fd1, int fd2);
+#else
+#  defile file_dup2(fd1, fd2) dup2(fd1, fd2)
+#endif
+
 /* fs_openblockdriver.c ******************************************************/
 
 EXTERN int open_blockdriver(FAR const char *pathname, int mountflags,

include/nuttx/net.h

@@ -1,7 +1,7 @@
 /****************************************************************************
  * nuttx/net.h
  *
- *   Copyright (C) 2007 Gregory Nutt. All rights reserved.
+ *   Copyright (C) 2007, 2009 Gregory Nutt. All rights reserved.
  *   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
  *
  * Redistribution and use in source and binary forms, with or without
@@ -138,14 +138,14 @@ EXTERN FAR struct socketlist *net_alloclist(void);
 EXTERN int net_addreflist(FAR struct socketlist *list);
 EXTERN int net_releaselist(FAR struct socketlist *list);
 
-/* net-close.c ***************************************************************/
+/* net_close.c ***************************************************************/
 /* The standard close() operation redirects operations on socket descriptors
  * to this function.
  */
 
 EXTERN int net_close(int sockfd);
 
-/* net-ioctl.c ***************************************************************/
+/* net_ioctl.c ***************************************************************/
 /* The standard ioctl() operation redirects operations on socket descriptors
  * to this function.
  */
@@ -153,7 +153,7 @@ EXTERN int net_close(int sockfd);
 struct ifreq; /* Forward reference -- see net/ioctls.h */
 EXTERN int netdev_ioctl(int sockfd, int cmd, struct ifreq *req);
 
-/* net-poll.c ****************************************************************/
+/* net_poll.c ****************************************************************/
 /* The standard poll() operation redirects operations on socket descriptors
  * to this function.
  */
@@ -163,6 +163,14 @@ struct pollfd; /* Forward reference -- see poll.h */
 EXTERN int net_poll(int sockfd, struct pollfd *fds, boolean setup);
 #endif
 
+/* net_dup.c *****************************************************************/
+/* The standard dup() and dup2() operations redirect operations on socket
+ * descriptors to these function.
+ */
+
+EXTERN int net_dup(int sockfd);
+EXTERN int net_dup2(int sockfd1, int sockfd2);
+
 /* netdev-register.c *********************************************************/
 /* This function is called by network interface device drivers to inform the
  * socket layer of their existence.  This registration is necesary to support
@@ -172,7 +180,7 @@ EXTERN int net_poll(int sockfd, struct pollfd *fds, boolean setup);
 
 EXTERN int netdev_register(FAR struct uip_driver_s *dev);
 
-/* net-foreach.c ************************************************************/
+/* net_foreach.c ************************************************************/
 /* Enumerates all registered network devices */
 
 EXTERN int netdev_foreach(netdev_callback_t callback, void *arg);