Add new psock layer; telnet session is now wrapped in a character device

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@4347 42af7a65-404d-4744-a932-0658087f49c3

ChangeLog

@@ -2408,3 +2408,5 @@
 	  sub-directory:  By making libboard.a a "phony" target, libboard.a should
 	  always rebuilt (the end result is worth the small increase in build time)
 	  (submitted by Mike Smith).
+	* include/net/psock.h:  A new low level socket interface that allows the OS
+	  to use the socket interface without having a socket descriptor.

include/net/psock.h

@@ -0,0 +1,312 @@
+/****************************************************************************
+ * include/net/psock.h
+ *
+ *   Copyright (C) 2012 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+#ifndef __NET_PSOCK_H
+#define __NET_PSOCK_H
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+#include <sys/types.h>
+
+#ifdef CONFIG_NET
+
+/****************************************************************************
+ * Pre-Processor Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Type Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Function Prototypes
+ ****************************************************************************/
+
+#undef EXTERN
+#if defined(__cplusplus)
+#define EXTERN extern "C"
+extern "C" {
+#else
+#define EXTERN extern
+#endif
+
+/****************************************************************************
+ * Function: sockfd_socket
+ *
+ * Description:
+ *   Given a socket descriptor, return the underly NuttX-specific socket
+ *   structure.
+ *
+ * Parameters:
+ *   psock   Socket instance
+ *
+ * Returned Value:
+ *   0 on success; -1 on error with errno set appropriately.
+ *
+ * Assumptions:
+ *
+ ****************************************************************************/
+
+struct socket;
+EXTERN FAR struct socket *sockfd_socket(int sockfd);
+
+/****************************************************************************
+ * Function: psock_close
+ *
+ * Description:
+ *   Performs the close operation on a socket instance
+ *
+ * Parameters:
+ *   psock   Socket instance
+ *
+ * Returned Value:
+ *   0 on success; -1 on error with errno set appropriately.
+ *
+ * Assumptions:
+ *
+ ****************************************************************************/
+
+struct socket;
+EXTERN int psock_close(FAR struct socket *psock);
+
+/****************************************************************************
+ * Function: psock_send
+ *
+ * Description:
+ *   The send() call may be used only when the socket is in a connected state
+ *   (so that the intended recipient is known). The only difference between
+ *   send() and write() is the presence of flags. With zero flags parameter,
+ *   send() is equivalent to write(). Also, send(sockfd,buf,len,flags) is
+ *   equivalent to sendto(sockfd,buf,len,flags,NULL,0).
+ *
+ * Parameters:
+ *   psock    And instance of the internal socket structure.
+ *   buf      Data to send
+ *   len      Length of data to send
+ *   flags    Send flags
+ *
+ * Returned Value:
+ *   On success, returns the number of characters sent.  On  error,
+ *   -1 is returned, and errno is set appropriately:
+ *
+ *   EAGAIN or EWOULDBLOCK
+ *     The socket is marked non-blocking and the requested operation
+ *     would block.
+ *   EBADF
+ *     An invalid descriptor was specified.
+ *   ECONNRESET
+ *     Connection reset by peer.
+ *   EDESTADDRREQ
+ *     The socket is not connection-mode, and no peer address is set.
+ *   EFAULT
+ *      An invalid user space address was specified for a parameter.
+ *   EINTR
+ *      A signal occurred before any data was transmitted.
+ *   EINVAL
+ *      Invalid argument passed.
+ *   EISCONN
+ *     The connection-mode socket was connected already but a recipient
+ *     was specified. (Now either this error is returned, or the recipient
+ *     specification is ignored.)
+ *   EMSGSIZE
+ *     The socket type requires that message be sent atomically, and the
+ *     size of the message to be sent made this impossible.
+ *   ENOBUFS
+ *     The output queue for a network interface was full. This generally
+ *     indicates that the interface has stopped sending, but may be
+ *     caused by transient congestion.
+ *   ENOMEM
+ *     No memory available.
+ *   ENOTCONN
+ *     The socket is not connected, and no target has been given.
+ *   ENOTSOCK
+ *     The argument s is not a socket.
+ *   EOPNOTSUPP
+ *     Some bit in the flags argument is inappropriate for the socket
+ *     type.
+ *   EPIPE
+ *     The local end has been shut down on a connection oriented socket.
+ *     In this case the process will also receive a SIGPIPE unless
+ *     MSG_NOSIGNAL is set.
+ *
+ * Assumptions:
+ *
+ ****************************************************************************/
+
+struct socket;
+EXTERN ssize_t psock_send(FAR struct socket *psock, const void *buf,
+                          size_t len, int flags);
+
+/****************************************************************************
+ * Function: psock_sendto
+ *
+ * Description:
+ *   If sendto() is used on a connection-mode (SOCK_STREAM, SOCK_SEQPACKET)
+ *   socket, the parameters to and 'tolen' are ignored (and the error EISCONN
+ *   may be returned when they are not NULL and 0), and the error ENOTCONN is
+ *   returned when the socket was not actually connected.
+ *
+ * Parameters:
+ *   psock    A pointer to a NuttX-specific, internal socket structure
+ *   buf      Data to send
+ *   len      Length of data to send
+ *   flags    Send flags
+ *   to       Address of recipient
+ *   tolen    The length of the address structure
+ *
+ * Returned Value:
+ *   On success, returns the number of characters sent.  On  error,
+ *   -1 is returned, and errno is set appropriately:
+ *
+ *   EAGAIN or EWOULDBLOCK
+ *     The socket is marked non-blocking and the requested operation
+ *     would block.
+ *   EBADF
+ *     An invalid descriptor was specified.
+ *   ECONNRESET
+ *     Connection reset by peer.
+ *   EDESTADDRREQ
+ *     The socket is not connection-mode, and no peer address is set.
+ *   EFAULT
+ *      An invalid user space address was specified for a parameter.
+ *   EINTR
+ *      A signal occurred before any data was transmitted.
+ *   EINVAL
+ *      Invalid argument passed.
+ *   EISCONN
+ *     The connection-mode socket was connected already but a recipient
+ *     was specified. (Now either this error is returned, or the recipient
+ *     specification is ignored.)
+ *   EMSGSIZE
+ *     The socket type requires that message be sent atomically, and the
+ *     size of the message to be sent made this impossible.
+ *   ENOBUFS
+ *     The output queue for a network interface was full. This generally
+ *     indicates that the interface has stopped sending, but may be
+ *     caused by transient congestion.
+ *   ENOMEM
+ *     No memory available.
+ *   ENOTCONN
+ *     The socket is not connected, and no target has been given.
+ *   ENOTSOCK
+ *     The argument s is not a socket.
+ *   EOPNOTSUPP
+ *     Some bit in the flags argument is inappropriate for the socket
+ *     type.
+ *   EPIPE
+ *     The local end has been shut down on a connection oriented socket.
+ *     In this case the process will also receive a SIGPIPE unless
+ *     MSG_NOSIGNAL is set.
+ *
+ * Assumptions:
+ *
+ ****************************************************************************/
+
+struct socket;
+struct sockaddr;
+EXTERN ssize_t psock_sendto(FAR struct socket *psock, FAR const void *buf,
+                            size_t len, int flags, FAR const struct sockaddr *to,
+                            socklen_t tolen);
+
+/****************************************************************************
+ * Function: psock_recvfrom
+ *
+ * Description:
+ *   recvfrom() receives messages from a socket, and may be used to receive
+ *   data on a socket whether or not it is connection-oriented.
+ *
+ *   If from is not NULL, and the underlying protocol provides the source
+ *   address, this source address is filled in. The argument fromlen
+ *   initialized to the size of the buffer associated with from, and modified
+ *   on return to indicate the actual size of the address stored there.
+ *
+ * Parameters:
+ *   psock    A pointer to a NuttX-specific, internal socket structure
+ *   buf      Buffer to receive data
+ *   len      Length of buffer
+ *   flags    Receive flags
+ *   from     Address of source (may be NULL)
+ *   fromlen  The length of the address structure
+ *
+ * Returned Value:
+ *   On success, returns the number of characters sent.  On  error,
+ *   -1 is returned, and errno is set appropriately:
+ *
+ *   EAGAIN
+ *     The socket is marked non-blocking and the receive operation would block,
+ *     or a receive timeout had been set and the timeout expired before data
+ *     was received.
+ *   EBADF
+ *     The argument sockfd is an invalid descriptor.
+ *   ECONNREFUSED
+ *     A remote host refused to allow the network connection (typically because
+ *     it is not running the requested service).
+ *   EFAULT
+ *     The receive buffer pointer(s) point outside the process's address space.
+ *   EINTR
+ *     The receive was interrupted by delivery of a signal before any data were
+ *     available.
+ *   EINVAL
+ *     Invalid argument passed.
+ *   ENOMEM
+ *     Could not allocate memory.
+ *   ENOTCONN
+ *     The socket is associated with a connection-oriented protocol and has
+ *     not been connected.
+ *   ENOTSOCK
+ *     The argument sockfd does not refer to a socket.
+ *
+ * Assumptions:
+ *
+ ****************************************************************************/
+
+struct socket;
+struct sockaddr;
+EXTERN ssize_t psock_recvfrom(FAR struct socket *psock, FAR void *buf,
+                              size_t len, int flags,FAR struct sockaddr *from,
+                              FAR socklen_t *fromlen);
+
+#define psock_recv(psock,buf,len,flags) psock_recvfrom(psock,buf,len,flags,NULL,0)
+
+#undef EXTERN
+#if defined(__cplusplus)
+}
+#endif
+
+#endif /* CONFIG_NET */
+#endif /* __NET_PSOCK_H */

net/net_close.c

@@ -1,8 +1,8 @@
 /****************************************************************************
  * net/net_close.c
  *
- *   Copyright (C) 2007-2011 Gregory Nutt. All rights reserved.
+ *   Copyright (C) 2007-2012 Gregory Nutt. All rights reserved.
- *   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
@@ -199,10 +199,10 @@ static inline void netclose_disconnect(FAR struct socket *psock)
  ****************************************************************************/
 
 /****************************************************************************
- * Function: net_closesocket
+ * Function: psock_close
  *
  * Description:
- *   Performs the close operation on asocket instance
+ *   Performs the close operation on a socket instance
  *
  * Parameters:
  *   psock   Socket instance
@@ -214,7 +214,7 @@ static inline void netclose_disconnect(FAR struct socket *psock)
  *
  ****************************************************************************/
 
-int net_closesocket(FAR struct socket *psock)
+int psock_close(FAR struct socket *psock)
 {
   int err;
 
@@ -324,7 +324,7 @@ errout:
 
 int net_close(int sockfd)
 {
-  return net_closesocket(sockfd_socket(sockfd));
+  return psock_close(sockfd_socket(sockfd));
 }
 
 #endif /* CONFIG_NET */

net/net_internal.h

@@ -1,8 +1,8 @@
 /****************************************************************************
  * net/net_internal.h
  *
- *   Copyright (C) 2007-2009, 2011 Gregory Nutt. All rights reserved.
+ *   Copyright (C) 2007-2009, 2011-2012 Gregory Nutt. All rights reserved.
- *   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
@@ -48,6 +48,7 @@
 #include <time.h>
 
 #include <nuttx/net.h>
+#include <net/psock.h>
 #include <net/uip/uip.h>
 
 /****************************************************************************
@@ -157,7 +158,7 @@ EXTERN FAR struct socket *sockfd_socket(int sockfd);
 
 /* net_close.c ***************************************************************/
 
-EXTERN int net_closesocket(FAR struct socket *psock);
+EXTERN int psock_close(FAR struct socket *psock);
 
 /* sockopt support ***********************************************************/
 
@@ -206,6 +207,11 @@ EXTERN void arptimer_init(void);
 # define arptimer_init()
 #endif
 
+/* send.c ********************************************************************/
+
+EXTERN ssize_t psock_send(FAR struct socket *psock, const void *buf,
+                          size_t len, int flags);
+
 #undef EXTERN
 #if defined(__cplusplus)
 }

net/net_poll.c

@@ -1,8 +1,8 @@
 /****************************************************************************
  * net/net_poll.c
  *
- *   Copyright (C) 2008-2009, 2011 Gregory Nutt. All rights reserved.
+ *   Copyright (C) 2008-2009, 2011-2012 Gregory Nutt. All rights reserved.
- *   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions

net/net_sockets.c

@@ -1,8 +1,8 @@
 /****************************************************************************
  * net/net_sockets.c
  *
- *   Copyright (C) 2007-2009, 2011 Gregory Nutt. All rights reserved.
+ *   Copyright (C) 2007-2009, 2011-2012 Gregory Nutt. All rights reserved.
- *   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
@@ -186,7 +186,7 @@ int net_releaselist(FAR struct socketlist *list)
        if (crefs <= 0)
          {
 	       /* Close each open socket in the list
-	        * REVISIT:  net_closesocket() will attempt to use semaphores.
+	        * REVISIT:  psock_close() will attempt to use semaphores.
 	        * If we actually are in the IDLE thread, then could this cause
 	        * problems?  Probably not, it the task has exited and crefs is
 	        * zero, then there probably could not be a contender for the
@@ -198,7 +198,7 @@ int net_releaselist(FAR struct socketlist *list)
                FAR struct socket *psock = &list->sl_sockets[ndx];
                if (psock->s_crefs > 0)
                  {
-	               (void)net_closesocket(psock);
+	               (void)psock_close(psock);
                  }
              }
 

net/recv.c

@@ -1,8 +1,8 @@
 /****************************************************************************
  * net/recv.c
  *
- *   Copyright (C) 2007, 2008 Gregory Nutt. All rights reserved.
+ *   Copyright (C) 2007, 2008, 2012 Gregory Nutt. All rights reserved.
- *   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions

net/recvfrom.c

@@ -1,8 +1,8 @@
 /****************************************************************************
  * net/recvfrom.c
  *
- *   Copyright (C) 2007-2009, 2011 Gregory Nutt. All rights reserved.
+ *   Copyright (C) 2007-2009, 2011-2012 Gregory Nutt. All rights reserved.
- *   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
@@ -988,7 +988,7 @@ static ssize_t tcp_recvfrom(FAR struct socket *psock, FAR void *buf, size_t len,
  ****************************************************************************/
 
 /****************************************************************************
- * Function: recvfrom
+ * Function: psock_recvfrom
  *
  * Description:
  *   recvfrom() receives messages from a socket, and may be used to receive
@@ -1000,7 +1000,7 @@ static ssize_t tcp_recvfrom(FAR struct socket *psock, FAR void *buf, size_t len,
  *   on return to indicate the actual size of the address stored there.
  *
  * Parameters:
- *   sockfd   Socket descriptor of socket
+ *   psock    A pointer to a NuttX-specific, internal socket structure
  *   buf      Buffer to receive data
  *   len      Length of buffer
  *   flags    Receive flags
@@ -1039,11 +1039,10 @@ static ssize_t tcp_recvfrom(FAR struct socket *psock, FAR void *buf, size_t len,
  *
  ****************************************************************************/
 
-ssize_t recvfrom(int sockfd, FAR void *buf, size_t len, int flags,
+ssize_t psock_recvfrom(FAR struct socket *psock, FAR void *buf, size_t len,
-                 FAR struct sockaddr *from, FAR socklen_t *fromlen)
+                       int flags,FAR struct sockaddr *from,
+                       FAR socklen_t *fromlen)
 {
-  FAR struct socket *psock;
-
 #if defined(CONFIG_NET_UDP) || defined(CONFIG_NET_TCP)
 #ifdef CONFIG_NET_IPv6
   FAR struct sockaddr_in6 *infrom = (struct sockaddr_in6 *)from;
@@ -1065,10 +1064,8 @@ ssize_t recvfrom(int sockfd, FAR void *buf, size_t len, int flags,
     }
 #endif
 
-  /* Get the underlying socket structure */
   /* Verify that the sockfd corresponds to valid, allocated socket */
 
-  psock = sockfd_socket(sockfd);
   if (!psock || psock->s_crefs <= 0)
     {
       err = EBADF;
@@ -1136,4 +1133,70 @@ errout:
   return ERROR;
 }
 
+/****************************************************************************
+ * Function: recvfrom
+ *
+ * Description:
+ *   recvfrom() receives messages from a socket, and may be used to receive
+ *   data on a socket whether or not it is connection-oriented.
+ *
+ *   If from is not NULL, and the underlying protocol provides the source
+ *   address, this source address is filled in. The argument fromlen
+ *   initialized to the size of the buffer associated with from, and modified
+ *   on return to indicate the actual size of the address stored there.
+ *
+ * Parameters:
+ *   sockfd   Socket descriptor of socket
+ *   buf      Buffer to receive data
+ *   len      Length of buffer
+ *   flags    Receive flags
+ *   from     Address of source (may be NULL)
+ *   fromlen  The length of the address structure
+ *
+ * Returned Value:
+ *   On success, returns the number of characters sent.  On  error,
+ *   -1 is returned, and errno is set appropriately:
+ *
+ *   EAGAIN
+ *     The socket is marked non-blocking and the receive operation would block,
+ *     or a receive timeout had been set and the timeout expired before data
+ *     was received.
+ *   EBADF
+ *     The argument sockfd is an invalid descriptor.
+ *   ECONNREFUSED
+ *     A remote host refused to allow the network connection (typically because
+ *     it is not running the requested service).
+ *   EFAULT
+ *     The receive buffer pointer(s) point outside the process's address space.
+ *   EINTR
+ *     The receive was interrupted by delivery of a signal before any data were
+ *     available.
+ *   EINVAL
+ *     Invalid argument passed.
+ *   ENOMEM
+ *     Could not allocate memory.
+ *   ENOTCONN
+ *     The socket is associated with a connection-oriented protocol and has
+ *     not been connected.
+ *   ENOTSOCK
+ *     The argument sockfd does not refer to a socket.
+ *
+ * Assumptions:
+ *
+ ****************************************************************************/
+
+ssize_t recvfrom(int sockfd, FAR void *buf, size_t len, int flags,
+                 FAR struct sockaddr *from, FAR socklen_t *fromlen)
+{
+  FAR struct socket *psock;
+
+  /* Get the underlying socket structure */
+
+  psock = sockfd_socket(sockfd);
+
+  /* Then let psock_recvfrom() do all of the work */
+
+  return psock_recvfrom(psock, buf, len, flags, from, fromlen);
+}
+
 #endif /* CONFIG_NET */

net/send.c

@@ -1,8 +1,8 @@
 /****************************************************************************
  * net/send.c
  *
- *   Copyright (C) 2007-2011 Gregory Nutt. All rights reserved.
+ *   Copyright (C) 2007-2012 Gregory Nutt. All rights reserved.
- *   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
@@ -336,7 +336,7 @@ end_wait:
  ****************************************************************************/
 
 /****************************************************************************
- * Function: send
+ * Function: psock_send
  *
  * Description:
  *   The send() call may be used only when the socket is in a connected state
@@ -346,7 +346,7 @@ end_wait:
  *   equivalent to sendto(sockfd,buf,len,flags,NULL,0).
  *
  * Parameters:
- *   sockfd   Socket descriptor of socket
+ *   psock    And instance of the internal socket structure.
  *   buf      Data to send
  *   len      Length of data to send
  *   flags    Send flags
@@ -399,9 +399,8 @@ end_wait:
  *
  ****************************************************************************/
 
-ssize_t send(int sockfd, const void *buf, size_t len, int flags)
+ssize_t psock_send(FAR struct socket *psock, const void *buf, size_t len, int flags)
 {
-  FAR struct socket *psock = sockfd_socket(sockfd);
   struct send_s state;
   uip_lock_t save;
   int err;
@@ -525,4 +524,73 @@ errout:
   return ERROR;
 }
 
+/****************************************************************************
+ * Function: send
+ *
+ * Description:
+ *   The send() call may be used only when the socket is in a connected state
+ *   (so that the intended recipient is known). The only difference between
+ *   send() and write() is the presence of flags. With zero flags parameter,
+ *   send() is equivalent to write(). Also, send(sockfd,buf,len,flags) is
+ *   equivalent to sendto(sockfd,buf,len,flags,NULL,0).
+ *
+ * Parameters:
+ *   sockfd   Socket descriptor of socket
+ *   buf      Data to send
+ *   len      Length of data to send
+ *   flags    Send flags
+ *
+ * Returned Value:
+ *   On success, returns the number of characters sent.  On  error,
+ *   -1 is returned, and errno is set appropriately:
+ *
+ *   EAGAIN or EWOULDBLOCK
+ *     The socket is marked non-blocking and the requested operation
+ *     would block.
+ *   EBADF
+ *     An invalid descriptor was specified.
+ *   ECONNRESET
+ *     Connection reset by peer.
+ *   EDESTADDRREQ
+ *     The socket is not connection-mode, and no peer address is set.
+ *   EFAULT
+ *      An invalid user space address was specified for a parameter.
+ *   EINTR
+ *      A signal occurred before any data was transmitted.
+ *   EINVAL
+ *      Invalid argument passed.
+ *   EISCONN
+ *     The connection-mode socket was connected already but a recipient
+ *     was specified. (Now either this error is returned, or the recipient
+ *     specification is ignored.)
+ *   EMSGSIZE
+ *     The socket type requires that message be sent atomically, and the
+ *     size of the message to be sent made this impossible.
+ *   ENOBUFS
+ *     The output queue for a network interface was full. This generally
+ *     indicates that the interface has stopped sending, but may be
+ *     caused by transient congestion.
+ *   ENOMEM
+ *     No memory available.
+ *   ENOTCONN
+ *     The socket is not connected, and no target has been given.
+ *   ENOTSOCK
+ *     The argument s is not a socket.
+ *   EOPNOTSUPP
+ *     Some bit in the flags argument is inappropriate for the socket
+ *     type.
+ *   EPIPE
+ *     The local end has been shut down on a connection oriented socket.
+ *     In this case the process will also receive a SIGPIPE unless
+ *     MSG_NOSIGNAL is set.
+ *
+ * Assumptions:
+ *
+ ****************************************************************************/
+
+ssize_t send(int sockfd, const void *buf, size_t len, int flags)
+{
+  return psock_send(sockfd_socket(sockfd), buf, len, flags);
+}
+
 #endif /* CONFIG_NET && CONFIG_NET_TCP */

net/sendto.c

@@ -1,8 +1,8 @@
 /****************************************************************************
  * net/sendto.c
  *
- *   Copyright (C) 2007-2009, 2011 Gregory Nutt. All rights reserved.
+ *   Copyright (C) 2007-2009, 2011-2012 Gregory Nutt. All rights reserved.
- *   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
@@ -157,7 +157,7 @@ static uint16_t sendto_interrupt(struct uip_driver_s *dev, void *conn,
  ****************************************************************************/
 
 /****************************************************************************
- * Function: sendto
+ * Function: psock_sendto
  *
  * Description:
  *   If sendto() is used on a connection-mode (SOCK_STREAM, SOCK_SEQPACKET)
@@ -166,7 +166,7 @@ static uint16_t sendto_interrupt(struct uip_driver_s *dev, void *conn,
  *   returned when the socket was not actually connected.
  *
  * Parameters:
- *   sockfd   Socket descriptor of socket
+ *   psock    A pointer to a NuttX-specific, internal socket structure
  *   buf      Data to send
  *   len      Length of data to send
  *   flags    Send flags
@@ -221,10 +221,10 @@ static uint16_t sendto_interrupt(struct uip_driver_s *dev, void *conn,
  *
  ****************************************************************************/
 
-ssize_t sendto(int sockfd, const void *buf, size_t len, int flags,
+ssize_t psock_sendto(FAR struct socket *psock, FAR const void *buf,
-               const struct sockaddr *to, socklen_t tolen)
+                     size_t len, int flags, FAR const struct sockaddr *to,
+                     socklen_t tolen)
 {
-  FAR struct socket *psock;
 #ifdef CONFIG_NET_UDP
   FAR struct uip_udp_conn *conn;
 #ifdef CONFIG_NET_IPv6
@@ -245,7 +245,7 @@ ssize_t sendto(int sockfd, const void *buf, size_t len, int flags,
   if (!to || !tolen)
     {
 #ifdef CONFIG_NET_TCP
-      return send(sockfd, buf, len, flags);
+      return psock_send(psock, buf, len, flags);
 #else
       err = EINVAL;
       goto errout;
@@ -264,10 +264,8 @@ ssize_t sendto(int sockfd, const void *buf, size_t len, int flags,
       goto errout;
   }
 
-  /* Get the underlying socket structure */
+  /* Verify that the psock corresponds to valid, allocated socket */
-  /* Verify that the sockfd corresponds to valid, allocated socket */
 
-  psock = sockfd_socket(sockfd);
   if (!psock || psock->s_crefs <= 0)
     {
       err = EBADF;
@@ -369,4 +367,83 @@ errout:
   return ERROR;
 }
 
+/****************************************************************************
+ * Function: sendto
+ *
+ * Description:
+ *   If sendto() is used on a connection-mode (SOCK_STREAM, SOCK_SEQPACKET)
+ *   socket, the parameters to and 'tolen' are ignored (and the error EISCONN
+ *   may be returned when they are not NULL and 0), and the error ENOTCONN is
+ *   returned when the socket was not actually connected.
+ *
+ * Parameters:
+ *   sockfd   Socket descriptor of socket
+ *   buf      Data to send
+ *   len      Length of data to send
+ *   flags    Send flags
+ *   to       Address of recipient
+ *   tolen    The length of the address structure
+ *
+ * Returned Value:
+ *   On success, returns the number of characters sent.  On  error,
+ *   -1 is returned, and errno is set appropriately:
+ *
+ *   EAGAIN or EWOULDBLOCK
+ *     The socket is marked non-blocking and the requested operation
+ *     would block.
+ *   EBADF
+ *     An invalid descriptor was specified.
+ *   ECONNRESET
+ *     Connection reset by peer.
+ *   EDESTADDRREQ
+ *     The socket is not connection-mode, and no peer address is set.
+ *   EFAULT
+ *      An invalid user space address was specified for a parameter.
+ *   EINTR
+ *      A signal occurred before any data was transmitted.
+ *   EINVAL
+ *      Invalid argument passed.
+ *   EISCONN
+ *     The connection-mode socket was connected already but a recipient
+ *     was specified. (Now either this error is returned, or the recipient
+ *     specification is ignored.)
+ *   EMSGSIZE
+ *     The socket type requires that message be sent atomically, and the
+ *     size of the message to be sent made this impossible.
+ *   ENOBUFS
+ *     The output queue for a network interface was full. This generally
+ *     indicates that the interface has stopped sending, but may be
+ *     caused by transient congestion.
+ *   ENOMEM
+ *     No memory available.
+ *   ENOTCONN
+ *     The socket is not connected, and no target has been given.
+ *   ENOTSOCK
+ *     The argument s is not a socket.
+ *   EOPNOTSUPP
+ *     Some bit in the flags argument is inappropriate for the socket
+ *     type.
+ *   EPIPE
+ *     The local end has been shut down on a connection oriented socket.
+ *     In this case the process will also receive a SIGPIPE unless
+ *     MSG_NOSIGNAL is set.
+ *
+ * Assumptions:
+ *
+ ****************************************************************************/
+
+ssize_t sendto(int sockfd, FAR const void *buf, size_t len, int flags,
+               FAR const struct sockaddr *to, socklen_t tolen)
+{
+  FAR struct socket *psock;
+
+  /* Get the underlying socket structure */
+
+  psock = sockfd_socket(sockfd);
+
+  /* And let psock_sendto do all of the work */
+
+  return psock_sendto(psock, buf, len, flags, to, tolen);
+}
+
 #endif /* CONFIG_NET */