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 /**
  * @file
  * Sockets BSD-Like API module
  *
  */
 
 /*
  * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
  * All rights reserved.
  *
  * 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. The name of the author may not be used to endorse or promote products
  *    derived from this software without specific prior written permission.
  *
  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
  *
  * This file is part of the lwIP TCP/IP stack.
  *
  * Author: Adam Dunkels <adam@sics.se>
  *
  * Improved by Marc Boucher <marc@mbsi.ca> and David Haas <dhaas@alum.rpi.edu>
  *
  */
 
 #include "lwip/opt.h"
 
 #if LWIP_SOCKET /* don't build if not configured for use in lwipopts.h */
 
 #include "lwip/sockets.h"
 #include "lwip/api.h"
 #include "lwip/sys.h"
 #include "lwip/igmp.h"
 #include "lwip/inet.h"
 #include "lwip/tcp.h"
 #include "lwip/raw.h"
 #include "lwip/udp.h"
 #include "lwip/tcpip.h"
 
 #include <string.h>
 
 #define NUM_SOCKETS MEMP_NUM_NETCONN
 
 /** Contains all internal pointers and states used for a socket */
 struct lwip_socket {
   /** sockets currently are built on netconns, each socket has one netconn */
   struct netconn *conn;
   /** data that was left from the previous read */
   struct netbuf *lastdata;
   /** offset in the data that was left from the previous read */
   u16_t lastoffset;
   /** number of times data was received, set by event_callback(),
       tested by the receive and select functions */
   s16_t rcvevent;
   /** number of times data was received, set by event_callback(),
       tested by select */
   u16_t sendevent;
   /** socket flags (currently, only used for O_NONBLOCK) */
   u16_t flags;
   /** last error that occurred on this socket */
   int err;
 };
 
 /** Description for a task waiting in select */
 struct lwip_select_cb {
   /** Pointer to the next waiting task */
   struct lwip_select_cb *next;
   /** readset passed to select */
   fd_set *readset;
   /** writeset passed to select */
   fd_set *writeset;
   /** unimplemented: exceptset passed to select */
   fd_set *exceptset;
   /** don't signal the same semaphore twice: set to 1 when signalled */
   int sem_signalled;
   /** semaphore to wake up a task waiting for select */
   sys_sem_t sem;
 };
 
 /** This struct is used to pass data to the set/getsockopt_internal
  * functions running in tcpip_thread context (only a void* is allowed) */
 struct lwip_setgetsockopt_data {
   /** socket struct for which to change options */
   struct lwip_socket *sock;
   /** socket index for which to change options */
   int s;
   /** level of the option to process */
   int level;
   /** name of the option to process */
   int optname;
   /** set: value to set the option to
     * get: value of the option is stored here */
   void *optval;
   /** size of *optval */
   socklen_t *optlen;
   /** if an error occures, it is temporarily stored here */
   err_t err;
 };
 
 /** The global array of available sockets */
 static struct lwip_socket sockets[NUM_SOCKETS];
 /** The global list of tasks waiting for select */
 static struct lwip_select_cb *select_cb_list;
 
 /** Semaphore protecting the sockets array */
 static sys_sem_t socksem;
 /** Semaphore protecting select_cb_list */
 static sys_sem_t selectsem;
 
 /** Table to quickly map an lwIP error (err_t) to a socket error
   * by using -err as an index */
 static const int err_to_errno_table[] = {
   0,             /* ERR_OK          0      No error, everything OK. */
   ENOMEM,        /* ERR_MEM        -1      Out of memory error.     */
   ENOBUFS,       /* ERR_BUF        -2      Buffer error.            */
   ETIMEDOUT,     /* ERR_TIMEOUT    -3      Timeout                  */
   EHOSTUNREACH,  /* ERR_RTE        -4      Routing problem.         */
   ECONNABORTED,  /* ERR_ABRT       -5      Connection aborted.      */
   ECONNRESET,    /* ERR_RST        -6      Connection reset.        */
   ESHUTDOWN,     /* ERR_CLSD       -7      Connection closed.       */
   ENOTCONN,      /* ERR_CONN       -8      Not connected.           */
   EINVAL,        /* ERR_VAL        -9      Illegal value.           */
   EIO,           /* ERR_ARG        -10     Illegal argument.        */
   EADDRINUSE,    /* ERR_USE        -11     Address in use.          */
   -1,            /* ERR_IF         -12     Low-level netif error    */
   -1,            /* ERR_ISCONN     -13     Already connected.       */
   EINPROGRESS    /* ERR_INPROGRESS -14     Operation in progress    */
 };
 
 #define ERR_TO_ERRNO_TABLE_SIZE \
   (sizeof(err_to_errno_table)/sizeof(err_to_errno_table[0]))
 
 #define err_to_errno(err) \
   ((unsigned)(-(err)) < ERR_TO_ERRNO_TABLE_SIZE ? \
     err_to_errno_table[-(err)] : EIO)
 
 #ifdef ERRNO
 #ifndef set_errno
 #define set_errno(err) errno = (err)
 #endif
 #else
 #define set_errno(err)
 #endif
 
 #define sock_set_errno(sk, e) do { \
   sk->err = (e); \
   set_errno(sk->err); \
 } while (0)
 
 /* Forward delcaration of some functions */
 static void event_callback(struct netconn *conn, enum netconn_evt evt, u16_t len);
 static void lwip_getsockopt_internal(void *arg);
 static void lwip_setsockopt_internal(void *arg);
 
 /**
  * Initialize this module. This function has to be called before any other
  * functions in this module!
  */
 void
 lwip_socket_init(void)
 {
   socksem   = sys_sem_new(1);
   selectsem = sys_sem_new(1);
 }
 
 /**
  * Map a externally used socket index to the internal socket representation.
  *
  * @param s externally used socket index
  * @return struct lwip_socket for the socket or NULL if not found
  */
 static struct lwip_socket *
 get_socket(int s)
 {
   struct lwip_socket *sock;
 
   if ((s < 0) || (s >= NUM_SOCKETS)) {
     LWIP_DEBUGF(SOCKETS_DEBUG, ("get_socket(%d): invalid\n", s));
     set_errno(EBADF);
     return NULL;
   }
 
   sock = &sockets[s];
 
   if (!sock->conn) {
     LWIP_DEBUGF(SOCKETS_DEBUG, ("get_socket(%d): not active\n", s));
     set_errno(EBADF);
     return NULL;
   }
 
   return sock;
 }
 
 /**
  * Allocate a new socket for a given netconn.
  *
  * @param newconn the netconn for which to allocate a socket
  * @return the index of the new socket; -1 on error
  */
 static int
 alloc_socket(struct netconn *newconn)
 {
   int i;
 
   /* Protect socket array */
   sys_sem_wait(socksem);
 
   /* allocate a new socket identifier */
   for (i = 0; i < NUM_SOCKETS; ++i) {
     if (!sockets[i].conn) {
       sockets[i].conn       = newconn;
       sockets[i].lastdata   = NULL;
       sockets[i].lastoffset = 0;
       sockets[i].rcvevent   = 0;
       sockets[i].sendevent  = 1; /* TCP send buf is empty */
       sockets[i].flags      = 0;
       sockets[i].err        = 0;
       sys_sem_signal(socksem);
       return i;
     }
   }
   sys_sem_signal(socksem);
   return -1;
 }
 
 /* Below this, the well-known socket functions are implemented.
  * Use google.com or opengroup.org to get a good description :-)
  *
  * Exceptions are documented!
  */
 
 int
 lwip_accept(int s, struct sockaddr *addr, socklen_t *addrlen)
 {
   struct lwip_socket *sock, *nsock;
   struct netconn *newconn;
   struct ip_addr naddr;
   u16_t port;
   int newsock;
   struct sockaddr_in sin;
   err_t err;
 
   LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_accept(%d)...\n", s));
   sock = get_socket(s);
   if (!sock)
     return -1;
 
   if ((sock->flags & O_NONBLOCK) && (sock->rcvevent <= 0)) {
     LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_accept(%d): returning EWOULDBLOCK\n", s));
     sock_set_errno(sock, EWOULDBLOCK);
     return -1;
   }
 
   newconn = netconn_accept(sock->conn);
   if (!newconn) {
     LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_accept(%d) failed, err=%d\n", s, sock->conn->err));
     sock_set_errno(sock, err_to_errno(sock->conn->err));
     return -1;
   }
 
   /* get the IP address and port of the remote host */
   err = netconn_peer(newconn, &naddr, &port);
   if (err != ERR_OK) {
     netconn_delete(newconn);
     sock_set_errno(sock, err_to_errno(err));
     return -1;
   }
 
   /* Note that POSIX only requires us to check addr is non-NULL. addrlen must
    * not be NULL if addr is valid.
    */
   if (NULL != addr) {
     LWIP_ASSERT("addr valid but addrlen NULL", addrlen != NULL);
     memset(&sin, 0, sizeof(sin));
     sin.sin_len = sizeof(sin);
     sin.sin_family = AF_INET;
     sin.sin_port = htons(port);
     sin.sin_addr.s_addr = naddr.addr;
 
     if (*addrlen > sizeof(sin))
       *addrlen = sizeof(sin);
 
     MEMCPY(addr, &sin, *addrlen);
   }
 
   newsock = alloc_socket(newconn);
   if (newsock == -1) {
     netconn_delete(newconn);
     sock_set_errno(sock, ENFILE);
     return -1;
   }
   LWIP_ASSERT("invalid socket index", (newsock >= 0) && (newsock < NUM_SOCKETS));
   newconn->callback = event_callback;
   nsock = &sockets[newsock];
   LWIP_ASSERT("invalid socket pointer", nsock != NULL);
 
   sys_sem_wait(socksem);
   /* See event_callback: If data comes in right away after an accept, even
    * though the server task might not have created a new socket yet.
    * In that case, newconn->socket is counted down (newconn->socket--),
    * so nsock->rcvevent is >= 1 here!
    */
   nsock->rcvevent += -1 - newconn->socket;
   newconn->socket = newsock;
   sys_sem_signal(socksem);
 
   LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_accept(%d) returning new sock=%d addr=", s, newsock));
   ip_addr_debug_print(SOCKETS_DEBUG, &naddr);
   LWIP_DEBUGF(SOCKETS_DEBUG, (" port=%"U16_F"\n", port));
 
   sock_set_errno(sock, 0);
   return newsock;
 }
 
 int
 lwip_bind(int s, const struct sockaddr *name, socklen_t namelen)
 {
   struct lwip_socket *sock;
   struct ip_addr local_addr;
   u16_t local_port;
   err_t err;
 
   sock = get_socket(s);
   if (!sock)
     return -1;
 
   LWIP_ERROR("lwip_bind: invalid address", ((namelen == sizeof(struct sockaddr_in)) &&
              ((((const struct sockaddr_in *)name)->sin_family) == AF_INET)),
              sock_set_errno(sock, err_to_errno(ERR_ARG)); return -1;);
 
   local_addr.addr = ((const struct sockaddr_in *)name)->sin_addr.s_addr;
   local_port = ((const struct sockaddr_in *)name)->sin_port;
 
   LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_bind(%d, addr=", s));
   ip_addr_debug_print(SOCKETS_DEBUG, &local_addr);
   LWIP_DEBUGF(SOCKETS_DEBUG, (" port=%"U16_F")\n", ntohs(local_port)));
 
   err = netconn_bind(sock->conn, &local_addr, ntohs(local_port));
 
   if (err != ERR_OK) {
     LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_bind(%d) failed, err=%d\n", s, err));
     sock_set_errno(sock, err_to_errno(err));
     return -1;
   }
 
   LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_bind(%d) succeeded\n", s));
   sock_set_errno(sock, 0);
   return 0;
 }
 
 int
 lwip_close(int s)
 {
   struct lwip_socket *sock;
 
   LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_close(%d)\n", s));
 
   sock = get_socket(s);
   if (!sock) {
     return -1;
   }
 
   netconn_delete(sock->conn);
 
   sys_sem_wait(socksem);
   if (sock->lastdata) {
     netbuf_delete(sock->lastdata);
   }
   sock->lastdata   = NULL;
   sock->lastoffset = 0;
   sock->conn       = NULL;
   sock_set_errno(sock, 0);
   sys_sem_signal(socksem);
   return 0;
 }
 
 int
 lwip_connect(int s, const struct sockaddr *name, socklen_t namelen)
 {
   struct lwip_socket *sock;
   err_t err;
 
   sock = get_socket(s);
   if (!sock)
     return -1;
 
   LWIP_ERROR("lwip_connect: invalid address", ((namelen == sizeof(struct sockaddr_in)) &&
              ((((const struct sockaddr_in *)name)->sin_family) == AF_INET)),
              sock_set_errno(sock, err_to_errno(ERR_ARG)); return -1;);
 
   if (((const struct sockaddr_in *)name)->sin_family == AF_UNSPEC) {
     LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_connect(%d, AF_UNSPEC)\n", s));
     err = netconn_disconnect(sock->conn);
   } else {
     struct ip_addr remote_addr;
     u16_t remote_port;
 
     remote_addr.addr = ((const struct sockaddr_in *)name)->sin_addr.s_addr;
     remote_port = ((const struct sockaddr_in *)name)->sin_port;
 
     LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_connect(%d, addr=", s));
     ip_addr_debug_print(SOCKETS_DEBUG, &remote_addr);
     LWIP_DEBUGF(SOCKETS_DEBUG, (" port=%"U16_F")\n", ntohs(remote_port)));
 
     err = netconn_connect(sock->conn, &remote_addr, ntohs(remote_port));
   }
 
   if (err != ERR_OK) {
     LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_connect(%d) failed, err=%d\n", s, err));
     sock_set_errno(sock, err_to_errno(err));
     return -1;
   }
 
   LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_connect(%d) succeeded\n", s));
   sock_set_errno(sock, 0);
   return 0;
 }
 
 /**
  * Set a socket into listen mode.
  * The socket may not have been used for another connection previously.
  *
  * @param s the socket to set to listening mode
  * @param backlog (ATTENTION: need TCP_LISTEN_BACKLOG=1)
  * @return 0 on success, non-zero on failure
  */
 int
 lwip_listen(int s, int backlog)
 {
   struct lwip_socket *sock;
   err_t err;
 
   LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_listen(%d, backlog=%d)\n", s, backlog));
 
   sock = get_socket(s);
   if (!sock)
     return -1;
 
   /* limit the "backlog" parameter to fit in an u8_t */
   if (backlog < 0) {
     backlog = 0;
   }
   if (backlog > 0xff) {
     backlog = 0xff;
   }
 
   err = netconn_listen_with_backlog(sock->conn, backlog);
 
   if (err != ERR_OK) {
     LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_listen(%d) failed, err=%d\n", s, err));
     sock_set_errno(sock, err_to_errno(err));
     return -1;
   }
 
   sock_set_errno(sock, 0);
   return 0;
 }
 
 int
 lwip_recvfrom(int s, void *mem, size_t len, int flags,
         struct sockaddr *from, socklen_t *fromlen)
 {
   struct lwip_socket *sock;
   struct netbuf      *buf;
   u16_t               buflen, copylen, off = 0;
   struct ip_addr     *addr;
   u16_t               port;
   u8_t                done = 0;
 
   LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_recvfrom(%d, %p, %"SZT_F", 0x%x, ..)\n", s, mem, len, flags));
   sock = get_socket(s);
   if (!sock)
     return -1;
 
   do {
     LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_recvfrom: top while sock->lastdata=%p\n", (void*)sock->lastdata));
     /* Check if there is data left from the last recv operation. */
     if (sock->lastdata) {
       buf = sock->lastdata;
     } else {
       /* If this is non-blocking call, then check first */
       if (((flags & MSG_DONTWAIT) || (sock->flags & O_NONBLOCK)) && 
           (sock->rcvevent <= 0)) {
         if (off > 0) {
           /* already received data, return that */
           sock_set_errno(sock, 0);
           return off;
         }
         LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_recvfrom(%d): returning EWOULDBLOCK\n", s));
         sock_set_errno(sock, EWOULDBLOCK);
         return -1;
       }
 
       /* No data was left from the previous operation, so we try to get
       some from the network. */
       sock->lastdata = buf = netconn_recv(sock->conn);
       LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_recvfrom: netconn_recv netbuf=%p\n", (void*)buf));
 
       if (!buf) {
         if (off > 0) {
           /* already received data, return that */
           sock_set_errno(sock, 0);
           return off;
         }
         /* We should really do some error checking here. */
         LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_recvfrom(%d): buf == NULL!\n", s));
         sock_set_errno(sock, (((sock->conn->pcb.ip != NULL) && (sock->conn->err == ERR_OK))
           ? ETIMEDOUT : err_to_errno(sock->conn->err)));
         return 0;
       }
     }
 
     buflen = netbuf_len(buf);
     LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_recvfrom: buflen=%"U16_F" len=%"SZT_F" off=%"U16_F" sock->lastoffset=%"U16_F"\n",
       buflen, len, off, sock->lastoffset));
 
     buflen -= sock->lastoffset;
 
     if (len > buflen) {
       copylen = buflen;
     } else {
       copylen = (u16_t)len;
     }
 
     /* copy the contents of the received buffer into
     the supplied memory pointer mem */
     netbuf_copy_partial(buf, (u8_t*)mem + off, copylen, sock->lastoffset);
 
     off += copylen;
 
     if (netconn_type(sock->conn) == NETCONN_TCP) {
       LWIP_ASSERT("invalid copylen, len would underflow", len >= copylen);
       len -= copylen;
       if ( (len <= 0) || 
            (buf->p->flags & PBUF_FLAG_PUSH) || 
            (sock->rcvevent <= 0) || 
            ((flags & MSG_PEEK)!=0)) {
         done = 1;
       }
     } else {
       done = 1;
     }
 
     /* Check to see from where the data was.*/
     if (done) {
       if (from && fromlen) {
         struct sockaddr_in sin;
 
         if (netconn_type(sock->conn) == NETCONN_TCP) {
           addr = (struct ip_addr*)&(sin.sin_addr.s_addr);
           netconn_getaddr(sock->conn, addr, &port, 0);
         } else {
           addr = netbuf_fromaddr(buf);
           port = netbuf_fromport(buf);
         }
 
         memset(&sin, 0, sizeof(sin));
         sin.sin_len = sizeof(sin);
         sin.sin_family = AF_INET;
         sin.sin_port = htons(port);
         sin.sin_addr.s_addr = addr->addr;
 
         if (*fromlen > sizeof(sin)) {
           *fromlen = sizeof(sin);
         }
 
         MEMCPY(from, &sin, *fromlen);
 
         LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_recvfrom(%d): addr=", s));
         ip_addr_debug_print(SOCKETS_DEBUG, addr);
         LWIP_DEBUGF(SOCKETS_DEBUG, (" port=%"U16_F" len=%"U16_F"\n", port, off));
       } else {
   #if SOCKETS_DEBUG
         struct sockaddr_in sin;
 
         if (netconn_type(sock->conn) == NETCONN_TCP) {
           addr = (struct ip_addr*)&(sin.sin_addr.s_addr);
           netconn_getaddr(sock->conn, addr, &port, 0);
         } else {
           addr = netbuf_fromaddr(buf);
           port = netbuf_fromport(buf);
         }
 
         LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_recvfrom(%d): addr=", s));
         ip_addr_debug_print(SOCKETS_DEBUG, addr);
         LWIP_DEBUGF(SOCKETS_DEBUG, (" port=%"U16_F" len=%"U16_F"\n", port, off));
   #endif /*  SOCKETS_DEBUG */
       }
     }
 
     /* If we don't peek the incoming message... */
     if ((flags & MSG_PEEK)==0) {
       /* If this is a TCP socket, check if there is data left in the
          buffer. If so, it should be saved in the sock structure for next
          time around. */
       if ((netconn_type(sock->conn) == NETCONN_TCP) && (buflen - copylen > 0)) {
         sock->lastdata = buf;
         sock->lastoffset += copylen;
         LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_recvfrom: lastdata now netbuf=%p\n", (void*)buf));
       } else {
         sock->lastdata = NULL;
         sock->lastoffset = 0;
         LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_recvfrom: deleting netbuf=%p\n", (void*)buf));
         netbuf_delete(buf);
       }
     }
   } while (!done);
 
   sock_set_errno(sock, 0);
   return off;
 }
 
 int
 lwip_read(int s, void *mem, size_t len)
 {
   return lwip_recvfrom(s, mem, len, 0, NULL, NULL);
 }
 
 int
 lwip_recv(int s, void *mem, size_t len, int flags)
 {
   return lwip_recvfrom(s, mem, len, flags, NULL, NULL);
 }
 
 int
 lwip_send(int s, const void *data, size_t size, int flags)
 {
   struct lwip_socket *sock;
   err_t err;
 
   LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_send(%d, data=%p, size=%"SZT_F", flags=0x%x)\n",
                               s, data, size, flags));
 
   sock = get_socket(s);
   if (!sock)
     return -1;
 
   if (sock->conn->type != NETCONN_TCP) {
 #if (LWIP_UDP || LWIP_RAW)
     return lwip_sendto(s, data, size, flags, NULL, 0);
 #else
     sock_set_errno(sock, err_to_errno(ERR_ARG));
     return -1;
 #endif /* (LWIP_UDP || LWIP_RAW) */
   }
 
   err = netconn_write(sock->conn, data, size, NETCONN_COPY | ((flags & MSG_MORE)?NETCONN_MORE:0));
 
   LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_send(%d) err=%d size=%"SZT_F"\n", s, err, size));
   sock_set_errno(sock, err_to_errno(err));
   return (err == ERR_OK ? (int)size : -1);
 }
 
 int
 lwip_sendto(int s, const void *data, size_t size, int flags,
        const struct sockaddr *to, socklen_t tolen)
 {
   struct lwip_socket *sock;
   struct ip_addr remote_addr;
   err_t err;
   u16_t short_size;
 #if !LWIP_TCPIP_CORE_LOCKING
   struct netbuf buf;
   u16_t remote_port;
 #endif
 
   sock = get_socket(s);
   if (!sock)
     return -1;
 
   if (sock->conn->type == NETCONN_TCP) {
 #if LWIP_TCP
     return lwip_send(s, data, size, flags);
 #else
     sock_set_errno(sock, err_to_errno(ERR_ARG));
     return -1;
 #endif /* LWIP_TCP */
   }
 
   LWIP_ASSERT("lwip_sendto: size must fit in u16_t", size <= 0xffff);
   short_size = (u16_t)size;
   LWIP_ERROR("lwip_sendto: invalid address", (((to == NULL) && (tolen == 0)) ||
              ((tolen == sizeof(struct sockaddr_in)) &&
              ((((const struct sockaddr_in *)to)->sin_family) == AF_INET))),
              sock_set_errno(sock, err_to_errno(ERR_ARG)); return -1;);
 
 #if LWIP_TCPIP_CORE_LOCKING
   /* Should only be consider like a sample or a simple way to experiment this option (no check of "to" field...) */
   { struct pbuf* p;
   
     p = pbuf_alloc(PBUF_TRANSPORT, 0, PBUF_REF);
     if (p == NULL) {
       err = ERR_MEM;
     } else {
       p->payload = (void*)data;
       p->len = p->tot_len = short_size;
       
       remote_addr.addr = ((const struct sockaddr_in *)to)->sin_addr.s_addr;
       
       LOCK_TCPIP_CORE();
       if (sock->conn->type==NETCONN_RAW) {
         err = sock->conn->err = raw_sendto(sock->conn->pcb.raw, p, &remote_addr);
       } else {
         err = sock->conn->err = udp_sendto(sock->conn->pcb.udp, p, &remote_addr, ntohs(((const struct sockaddr_in *)to)->sin_port));
       }
       UNLOCK_TCPIP_CORE();
       
       pbuf_free(p);
     }
   }
 #else
   /* initialize a buffer */
   buf.p = buf.ptr = NULL;
   if (to) {
     remote_addr.addr = ((const struct sockaddr_in *)to)->sin_addr.s_addr;
     remote_port      = ntohs(((const struct sockaddr_in *)to)->sin_port);
     buf.addr         = &remote_addr;
     buf.port         = remote_port;
   } else {
     remote_addr.addr = 0;
     remote_port      = 0;
     buf.addr         = NULL;
     buf.port         = 0;
   }
 
   LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_sendto(%d, data=%p, short_size=%d"U16_F", flags=0x%x to=",
               s, data, short_size, flags));
   ip_addr_debug_print(SOCKETS_DEBUG, &remote_addr);
   LWIP_DEBUGF(SOCKETS_DEBUG, (" port=%"U16_F"\n", remote_port));
 
   /* make the buffer point to the data that should be sent */
 #if LWIP_NETIF_TX_SINGLE_PBUF
   /* Allocate a new netbuf and copy the data into it. */
   if (netbuf_alloc(&buf, short_size) == NULL) {
     err = ERR_MEM;
   } else {
     err = netbuf_take(&buf, data, short_size);
   }
 #else /* LWIP_NETIF_TX_SINGLE_PBUF */
   err = netbuf_ref(&buf, data, short_size);
 #endif /* LWIP_NETIF_TX_SINGLE_PBUF */
   if (err == ERR_OK) {
     /* send the data */
     err = netconn_send(sock->conn, &buf);
   }
 
   /* deallocated the buffer */
   netbuf_free(&buf);
 #endif /* LWIP_TCPIP_CORE_LOCKING */
   sock_set_errno(sock, err_to_errno(err));
   return (err == ERR_OK ? short_size : -1);
 }
 
 int
 lwip_socket(int domain, int type, int protocol)
 {
   struct netconn *conn;
   int i;
 
   LWIP_UNUSED_ARG(domain);
 
   /* create a netconn */
   switch (type) {
   case SOCK_RAW:
     conn = netconn_new_with_proto_and_callback(NETCONN_RAW, (u8_t)protocol, event_callback);
     LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_socket(%s, SOCK_RAW, %d) = ",
                                  domain == PF_INET ? "PF_INET" : "UNKNOWN", protocol));
     break;
   case SOCK_DGRAM:
     conn = netconn_new_with_callback( (protocol == IPPROTO_UDPLITE) ?
                  NETCONN_UDPLITE : NETCONN_UDP, event_callback);
     LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_socket(%s, SOCK_DGRAM, %d) = ",
                                  domain == PF_INET ? "PF_INET" : "UNKNOWN", protocol));
     break;
   case SOCK_STREAM:
     conn = netconn_new_with_callback(NETCONN_TCP, event_callback);
     LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_socket(%s, SOCK_STREAM, %d) = ",
                                  domain == PF_INET ? "PF_INET" : "UNKNOWN", protocol));
     break;
   default:
     LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_socket(%d, %d/UNKNOWN, %d) = -1\n",
                                  domain, type, protocol));
     set_errno(EINVAL);
     return -1;
   }
 
   if (!conn) {
     LWIP_DEBUGF(SOCKETS_DEBUG, ("-1 / ENOBUFS (could not create netconn)\n"));
     set_errno(ENOBUFS);
     return -1;
   }
 
   i = alloc_socket(conn);
 
   if (i == -1) {
     netconn_delete(conn);
     set_errno(ENFILE);
     return -1;
   }
   conn->socket = i;
   LWIP_DEBUGF(SOCKETS_DEBUG, ("%d\n", i));
   set_errno(0);
   return i;
 }
 
 int
 lwip_write(int s, const void *data, size_t size)
 {
   return lwip_send(s, data, size, 0);
 }
 
 /**
  * Go through the readset and writeset lists and see which socket of the sockets
  * set in the sets has events. On return, readset, writeset and exceptset have
  * the sockets enabled that had events.
  *
  * exceptset is not used for now!!!
  *
  * @param maxfdp1 the highest socket index in the sets
  * @param readset in: set of sockets to check for read events;
  *                out: set of sockets that had read events
  * @param writeset in: set of sockets to check for write events;
  *                 out: set of sockets that had write events
  * @param exceptset not yet implemented
  * @return number of sockets that had events (read+write)
  */
 static int
 lwip_selscan(int maxfdp1, fd_set *readset, fd_set *writeset, fd_set *exceptset)
 {
   int i, nready = 0;
   fd_set lreadset, lwriteset, lexceptset;
   struct lwip_socket *p_sock;
   
   FD_ZERO(&lreadset);
   FD_ZERO(&lwriteset);
   FD_ZERO(&lexceptset);
   
   /* Go through each socket in each list to count number of sockets which
   currently match */
   for(i = 0; i < maxfdp1; i++) {
     if (FD_ISSET(i, readset)) {
       /* See if netconn of this socket is ready for read */
       p_sock = get_socket(i);
       if (p_sock && (p_sock->lastdata || (p_sock->rcvevent > 0))) {
         FD_SET(i, &lreadset);
         LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_selscan: fd=%d ready for reading\n", i));
         nready++;
       }
     }
     if (FD_ISSET(i, writeset)) {
       /* See if netconn of this socket is ready for write */
       p_sock = get_socket(i);
       if (p_sock && p_sock->sendevent) {
         FD_SET(i, &lwriteset);
         LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_selscan: fd=%d ready for writing\n", i));
         nready++;
       }
     }
   }
   *readset = lreadset;
   *writeset = lwriteset;
   FD_ZERO(exceptset);
   
   return nready;
 }
 
 
 /**
  * Processing exceptset is not yet implemented.
  */
 int
 lwip_select(int maxfdp1, fd_set *readset, fd_set *writeset, fd_set *exceptset,
                struct timeval *timeout)
 {
   int i;
   int nready;
   fd_set lreadset, lwriteset, lexceptset;
   u32_t msectimeout;
   struct lwip_select_cb select_cb;
   struct lwip_select_cb *p_selcb;
 
   LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_select(%d, %p, %p, %p, tvsec=%ld tvusec=%ld)\n",
                   maxfdp1, (void *)readset, (void *) writeset, (void *) exceptset,
                   timeout ? (long)timeout->tv_sec : (long)-1,
                   timeout ? (long)timeout->tv_usec : (long)-1));
 
   select_cb.next = 0;
   select_cb.readset = readset;
   select_cb.writeset = writeset;
   select_cb.exceptset = exceptset;
   select_cb.sem_signalled = 0;
 
   /* Protect ourselves searching through the list */
   sys_sem_wait(selectsem);
 
   if (readset)
     lreadset = *readset;
   else
     FD_ZERO(&lreadset);
   if (writeset)
     lwriteset = *writeset;
   else
     FD_ZERO(&lwriteset);
   if (exceptset)
     lexceptset = *exceptset;
   else
     FD_ZERO(&lexceptset);
 
   /* Go through each socket in each list to count number of sockets which
      currently match */
   nready = lwip_selscan(maxfdp1, &lreadset, &lwriteset, &lexceptset);
 
   /* If we don't have any current events, then suspend if we are supposed to */
   if (!nready) {
     if (timeout && timeout->tv_sec == 0 && timeout->tv_usec == 0) {
       sys_sem_signal(selectsem);
       if (readset)
         FD_ZERO(readset);
       if (writeset)
         FD_ZERO(writeset);
       if (exceptset)
         FD_ZERO(exceptset);
   
       LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_select: no timeout, returning 0\n"));
       set_errno(0);
   
       return 0;
     }
     
     /* add our semaphore to list */
     /* We don't actually need any dynamic memory. Our entry on the
      * list is only valid while we are in this function, so it's ok
      * to use local variables */
     
     select_cb.sem = sys_sem_new(0);
     /* Note that we are still protected */
     /* Put this select_cb on top of list */
     select_cb.next = select_cb_list;
     select_cb_list = &select_cb;
     
     /* Now we can safely unprotect */
     sys_sem_signal(selectsem);
     
     /* Now just wait to be woken */
     if (timeout == 0)
       /* Wait forever */
       msectimeout = 0;
     else {
       msectimeout =  ((timeout->tv_sec * 1000) + ((timeout->tv_usec + 500)/1000));
       if(msectimeout == 0)
         msectimeout = 1;
     }
     
     i = sys_sem_wait_timeout(select_cb.sem, msectimeout);
     
     /* Take us off the list */
     sys_sem_wait(selectsem);
     if (select_cb_list == &select_cb)
       select_cb_list = select_cb.next;
     else
       for (p_selcb = select_cb_list; p_selcb; p_selcb = p_selcb->next) {
         if (p_selcb->next == &select_cb) {
           p_selcb->next = select_cb.next;
           break;
         }
       }
     
     sys_sem_signal(selectsem);
     
     sys_sem_free(select_cb.sem);
     if (i == 0)  {
       /* Timeout */
       if (readset)
         FD_ZERO(readset);
       if (writeset)
         FD_ZERO(writeset);
       if (exceptset)
         FD_ZERO(exceptset);
   
       LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_select: timeout expired\n"));
       set_errno(0);
   
       return 0;
     }
     
     if (readset)
       lreadset = *readset;
     else
       FD_ZERO(&lreadset);
     if (writeset)
       lwriteset = *writeset;
     else
       FD_ZERO(&lwriteset);
     if (exceptset)
       lexceptset = *exceptset;
     else
       FD_ZERO(&lexceptset);
     
     /* See what's set */
     nready = lwip_selscan(maxfdp1, &lreadset, &lwriteset, &lexceptset);
   } else
     sys_sem_signal(selectsem);
   
   if (readset)
     *readset = lreadset;
   if (writeset)
     *writeset = lwriteset;
   if (exceptset)
     *exceptset = lexceptset;
   
   LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_select: nready=%d\n", nready));
   set_errno(0);
   
   return nready;
 }
 
 /**
  * Callback registered in the netconn layer for each socket-netconn.
  * Processes recvevent (data available) and wakes up tasks waiting for select.
  */
 static void
 event_callback(struct netconn *conn, enum netconn_evt evt, u16_t len)
 {
   int s;
   struct lwip_socket *sock;
   struct lwip_select_cb *scb;
 
   LWIP_UNUSED_ARG(len);
 
   /* Get socket */
   if (conn) {
     s = conn->socket;
     if (s < 0) {
       /* Data comes in right away after an accept, even though
        * the server task might not have created a new socket yet.
        * Just count down (or up) if that's the case and we
        * will use the data later. Note that only receive events
        * can happen before the new socket is set up. */
       sys_sem_wait(socksem);
       if (conn->socket < 0) {
         if (evt == NETCONN_EVT_RCVPLUS) {
           conn->socket--;
         }
         sys_sem_signal(socksem);
         return;
       }
       s = conn->socket;
       sys_sem_signal(socksem);
     }
 
     sock = get_socket(s);
     if (!sock) {
       return;
     }
   } else {
     return;
   }
 
   sys_sem_wait(selectsem);
   /* Set event as required */
   switch (evt) {
     case NETCONN_EVT_RCVPLUS:
       sock->rcvevent++;
       break;
     case NETCONN_EVT_RCVMINUS:
       sock->rcvevent--;
       break;
     case NETCONN_EVT_SENDPLUS:
       sock->sendevent = 1;
       break;
     case NETCONN_EVT_SENDMINUS:
       sock->sendevent = 0;
       break;
     default:
       LWIP_ASSERT("unknown event", 0);
       break;
   }
   sys_sem_signal(selectsem);
 
   /* Now decide if anyone is waiting for this socket */
   /* NOTE: This code is written this way to protect the select link list
      but to avoid a deadlock situation by releasing socksem before
      signalling for the select. This means we need to go through the list
      multiple times ONLY IF a select was actually waiting. We go through
      the list the number of waiting select calls + 1. This list is
      expected to be small. */
   while (1) {
     sys_sem_wait(selectsem);
     for (scb = select_cb_list; scb; scb = scb->next) {
       if (scb->sem_signalled == 0) {
         /* Test this select call for our socket */
         if (scb->readset && FD_ISSET(s, scb->readset))
           if (sock->rcvevent > 0)
             break;
         if (scb->writeset && FD_ISSET(s, scb->writeset))
           if (sock->sendevent)
             break;
       }
     }
     if (scb) {
       scb->sem_signalled = 1;
       sys_sem_signal(scb->sem);
       sys_sem_signal(selectsem);
     } else {
       sys_sem_signal(selectsem);
       break;
     }
   }
 }
 
 /**
  * Unimplemented: Close one end of a full-duplex connection.
  * Currently, the full connection is closed.
  */
 int
 lwip_shutdown(int s, int how)
 {
   LWIP_UNUSED_ARG(how);
   LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_shutdown(%d, how=%d)\n", s, how));
   return lwip_close(s); /* XXX temporary hack until proper implementation */
 }
 
 static int
 lwip_getaddrname(int s, struct sockaddr *name, socklen_t *namelen, u8_t local)
 {
   struct lwip_socket *sock;
   struct sockaddr_in sin;
   struct ip_addr naddr;
 
   sock = get_socket(s);
   if (!sock)
     return -1;
 
   memset(&sin, 0, sizeof(sin));
   sin.sin_len = sizeof(sin);
   sin.sin_family = AF_INET;
 
   /* get the IP address and port */
   netconn_getaddr(sock->conn, &naddr, &sin.sin_port, local);
 
   LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_getaddrname(%d, addr=", s));
   ip_addr_debug_print(SOCKETS_DEBUG, &naddr);
   LWIP_DEBUGF(SOCKETS_DEBUG, (" port=%"U16_F")\n", sin.sin_port));
 
   sin.sin_port = htons(sin.sin_port);
   sin.sin_addr.s_addr = naddr.addr;
 
   if (*namelen > sizeof(sin))
     *namelen = sizeof(sin);
 
   MEMCPY(name, &sin, *namelen);
   sock_set_errno(sock, 0);
   return 0;
 }
 
 int
 lwip_getpeername(int s, struct sockaddr *name, socklen_t *namelen)
 {
   return lwip_getaddrname(s, name, namelen, 0);
 }
 
 int
 lwip_getsockname(int s, struct sockaddr *name, socklen_t *namelen)
 {
   return lwip_getaddrname(s, name, namelen, 1);
 }
 
 int
 lwip_getsockopt(int s, int level, int optname, void *optval, socklen_t *optlen)
 {
   err_t err = ERR_OK;
   struct lwip_socket *sock = get_socket(s);
   struct lwip_setgetsockopt_data data;
 
   if (!sock)
     return -1;
 
   if ((NULL == optval) || (NULL == optlen)) {
     sock_set_errno(sock, EFAULT);
     return -1;
   }
 
   /* Do length and type checks for the various options first, to keep it readable. */
   switch (level) {
    
 /* Level: SOL_SOCKET */
   case SOL_SOCKET:
     switch (optname) {
        
     case SO_ACCEPTCONN:
     case SO_BROADCAST:
     /* UNIMPL case SO_DEBUG: */
     /* UNIMPL case SO_DONTROUTE: */
     case SO_ERROR:
     case SO_KEEPALIVE:
     /* UNIMPL case SO_CONTIMEO: */
     /* UNIMPL case SO_SNDTIMEO: */
 #if LWIP_SO_RCVTIMEO
     case SO_RCVTIMEO:
 #endif /* LWIP_SO_RCVTIMEO */
 #if LWIP_SO_RCVBUF
     case SO_RCVBUF:
 #endif /* LWIP_SO_RCVBUF */
     /* UNIMPL case SO_OOBINLINE: */
     /* UNIMPL case SO_SNDBUF: */
     /* UNIMPL case SO_RCVLOWAT: */
     /* UNIMPL case SO_SNDLOWAT: */
 #if SO_REUSE
     case SO_REUSEADDR:
     case SO_REUSEPORT:
 #endif /* SO_REUSE */
     case SO_TYPE:
     /* UNIMPL case SO_USELOOPBACK: */
       if (*optlen < sizeof(int)) {
         err = EINVAL;
       }
       break;
 
     case SO_NO_CHECK:
       if (*optlen < sizeof(int)) {
         err = EINVAL;
       }
 #if LWIP_UDP
       if ((sock->conn->type != NETCONN_UDP) ||
           ((udp_flags(sock->conn->pcb.udp) & UDP_FLAGS_UDPLITE) != 0)) {
         /* this flag is only available for UDP, not for UDP lite */
         err = EAFNOSUPPORT;
       }
 #endif /* LWIP_UDP */
       break;
 
     default:
       LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_getsockopt(%d, SOL_SOCKET, UNIMPL: optname=0x%x, ..)\n",
                                   s, optname));
       err = ENOPROTOOPT;
     }  /* switch (optname) */
     break;
                      
 /* Level: IPPROTO_IP */
   case IPPROTO_IP:
     switch (optname) {
     /* UNIMPL case IP_HDRINCL: */
     /* UNIMPL case IP_RCVDSTADDR: */
     /* UNIMPL case IP_RCVIF: */
     case IP_TTL:
     case IP_TOS:
       if (*optlen < sizeof(int)) {
         err = EINVAL;
       }
       break;
 #if LWIP_IGMP
     case IP_MULTICAST_TTL:
       if (*optlen < sizeof(u8_t)) {
         err = EINVAL;
       }
       break;
     case IP_MULTICAST_IF:
       if (*optlen < sizeof(struct in_addr)) {
         err = EINVAL;
       }
       break;
 #endif /* LWIP_IGMP */
 
     default:
       LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_getsockopt(%d, IPPROTO_IP, UNIMPL: optname=0x%x, ..)\n",
                                   s, optname));
       err = ENOPROTOOPT;
     }  /* switch (optname) */
     break;
          
 #if LWIP_TCP
 /* Level: IPPROTO_TCP */
   case IPPROTO_TCP:
     if (*optlen < sizeof(int)) {
       err = EINVAL;
       break;
     }
     
     /* If this is no TCP socket, ignore any options. */
     if (sock->conn->type != NETCONN_TCP)
       return 0;
 
     switch (optname) {
     case TCP_NODELAY:
     case TCP_KEEPALIVE:
 #if LWIP_TCP_KEEPALIVE
     case TCP_KEEPIDLE:
     case TCP_KEEPINTVL:
     case TCP_KEEPCNT:
 #endif /* LWIP_TCP_KEEPALIVE */
       break;
        
     default:
       LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_getsockopt(%d, IPPROTO_TCP, UNIMPL: optname=0x%x, ..)\n",
                                   s, optname));
       err = ENOPROTOOPT;
     }  /* switch (optname) */
     break;
 #endif /* LWIP_TCP */
 #if LWIP_UDP && LWIP_UDPLITE
 /* Level: IPPROTO_UDPLITE */
   case IPPROTO_UDPLITE:
     if (*optlen < sizeof(int)) {
       err = EINVAL;
       break;
     }
     
     /* If this is no UDP lite socket, ignore any options. */
     if (sock->conn->type != NETCONN_UDPLITE)
       return 0;
 
     switch (optname) {
     case UDPLITE_SEND_CSCOV:
     case UDPLITE_RECV_CSCOV:
       break;
        
     default:
       LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_getsockopt(%d, IPPROTO_UDPLITE, UNIMPL: optname=0x%x, ..)\n",
                                   s, optname));
       err = ENOPROTOOPT;
     }  /* switch (optname) */
     break;
 #endif /* LWIP_UDP && LWIP_UDPLITE*/
 /* UNDEFINED LEVEL */
   default:
       LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_getsockopt(%d, level=0x%x, UNIMPL: optname=0x%x, ..)\n",
                                   s, level, optname));
       err = ENOPROTOOPT;
   }  /* switch */
 
    
   if (err != ERR_OK) {
     sock_set_errno(sock, err);
     return -1;
   }
 
   /* Now do the actual option processing */
   data.sock = sock;
   data.level = level;
   data.optname = optname;
   data.optval = optval;
   data.optlen = optlen;
   data.err = err;
   tcpip_callback(lwip_getsockopt_internal, &data);
   sys_arch_sem_wait(sock->conn->op_completed, 0);
   /* maybe lwip_getsockopt_internal has changed err */
   err = data.err;
 
   sock_set_errno(sock, err);
   return err ? -1 : 0;
 }
 
 static void
 lwip_getsockopt_internal(void *arg)
 {
   struct lwip_socket *sock;
 #ifdef LWIP_DEBUG
   int s;
 #endif /* LWIP_DEBUG */
   int level, optname;
   void *optval;
   struct lwip_setgetsockopt_data *data;
 
   LWIP_ASSERT("arg != NULL", arg != NULL);
 
   data = (struct lwip_setgetsockopt_data*)arg;
   sock = data->sock;
 #ifdef LWIP_DEBUG
   s = data->s;
 #endif /* LWIP_DEBUG */
   level = data->level;
   optname = data->optname;
   optval = data->optval;
 
   switch (level) {
    
 /* Level: SOL_SOCKET */
   case SOL_SOCKET:
     switch (optname) {
 
     /* The option flags */
     case SO_ACCEPTCONN:
     case SO_BROADCAST:
     /* UNIMPL case SO_DEBUG: */
     /* UNIMPL case SO_DONTROUTE: */
     case SO_KEEPALIVE:
     /* UNIMPL case SO_OOBINCLUDE: */
 #if SO_REUSE
     case SO_REUSEADDR:
     case SO_REUSEPORT:
 #endif /* SO_REUSE */
     /*case SO_USELOOPBACK: UNIMPL */
       *(int*)optval = sock->conn->pcb.ip->so_options & optname;
       LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_getsockopt(%d, SOL_SOCKET, optname=0x%x, ..) = %s\n",
                                   s, optname, (*(int*)optval?"on":"off")));
       break;
 
     case SO_TYPE:
       switch (NETCONNTYPE_GROUP(sock->conn->type)) {
       case NETCONN_RAW:
         *(int*)optval = SOCK_RAW;
         break;
       case NETCONN_TCP:
         *(int*)optval = SOCK_STREAM;
         break;
       case NETCONN_UDP:
         *(int*)optval = SOCK_DGRAM;
         break;
       default: /* unrecognized socket type */
         *(int*)optval = sock->conn->type;
         LWIP_DEBUGF(SOCKETS_DEBUG,
                     ("lwip_getsockopt(%d, SOL_SOCKET, SO_TYPE): unrecognized socket type %d\n",
                     s, *(int *)optval));
       }  /* switch (sock->conn->type) */
       LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_getsockopt(%d, SOL_SOCKET, SO_TYPE) = %d\n",
                   s, *(int *)optval));
       break;
 
     case SO_ERROR:
       if (sock->err == 0) {
         sock_set_errno(sock, err_to_errno(sock->conn->err));
       } 
       *(int *)optval = sock->err;
       sock->err = 0;
       LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_getsockopt(%d, SOL_SOCKET, SO_ERROR) = %d\n",
                   s, *(int *)optval));
       break;
 
 #if LWIP_SO_RCVTIMEO
     case SO_RCVTIMEO:
       *(int *)optval = sock->conn->recv_timeout;
       break;
 #endif /* LWIP_SO_RCVTIMEO */
 #if LWIP_SO_RCVBUF
     case SO_RCVBUF:
       *(int *)optval = sock->conn->recv_bufsize;
       break;
 #endif /* LWIP_SO_RCVBUF */
 #if LWIP_UDP
     case SO_NO_CHECK:
       *(int*)optval = (udp_flags(sock->conn->pcb.udp) & UDP_FLAGS_NOCHKSUM) ? 1 : 0;
       break;
 #endif /* LWIP_UDP*/
     }  /* switch (optname) */
     break;
 
 /* Level: IPPROTO_IP */
   case IPPROTO_IP:
     switch (optname) {
     case IP_TTL:
       *(int*)optval = sock->conn->pcb.ip->ttl;
       LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_getsockopt(%d, IPPROTO_IP, IP_TTL) = %d\n",
                   s, *(int *)optval));
       break;
     case IP_TOS:
       *(int*)optval = sock->conn->pcb.ip->tos;
       LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_getsockopt(%d, IPPROTO_IP, IP_TOS) = %d\n",
                   s, *(int *)optval));
       break;
 #if LWIP_IGMP
     case IP_MULTICAST_TTL:
       *(u8_t*)optval = sock->conn->pcb.ip->ttl;
       LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_getsockopt(%d, IPPROTO_IP, IP_MULTICAST_TTL) = %d\n",
                   s, *(int *)optval));
       break;
     case IP_MULTICAST_IF:
       ((struct in_addr*) optval)->s_addr = sock->conn->pcb.udp->multicast_ip.addr;
       LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_getsockopt(%d, IPPROTO_IP, IP_MULTICAST_IF) = 0x%"X32_F"\n",
                   s, *(u32_t *)optval));
       break;
 #endif /* LWIP_IGMP */
     }  /* switch (optname) */
     break;
 
 #if LWIP_TCP
 /* Level: IPPROTO_TCP */
   case IPPROTO_TCP:
     switch (optname) {
     case TCP_NODELAY:
       *(int*)optval = tcp_nagle_disabled(sock->conn->pcb.tcp);
       LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_getsockopt(%d, IPPROTO_TCP, TCP_NODELAY) = %s\n",
                   s, (*(int*)optval)?"on":"off") );
       break;
     case TCP_KEEPALIVE:
       *(int*)optval = (int)sock->conn->pcb.tcp->keep_idle;
       LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_getsockopt(%d, IPPROTO_IP, TCP_KEEPALIVE) = %d\n",
                   s, *(int *)optval));
       break;
 
 #if LWIP_TCP_KEEPALIVE
     case TCP_KEEPIDLE:
       *(int*)optval = (int)(sock->conn->pcb.tcp->keep_idle/1000);
       LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_getsockopt(%d, IPPROTO_IP, TCP_KEEPIDLE) = %d\n",
                   s, *(int *)optval));
       break;
     case TCP_KEEPINTVL:
       *(int*)optval = (int)(sock->conn->pcb.tcp->keep_intvl/1000);
       LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_getsockopt(%d, IPPROTO_IP, TCP_KEEPINTVL) = %d\n",
                   s, *(int *)optval));
       break;
     case TCP_KEEPCNT:
       *(int*)optval = (int)sock->conn->pcb.tcp->keep_cnt;
       LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_getsockopt(%d, IPPROTO_IP, TCP_KEEPCNT) = %d\n",
                   s, *(int *)optval));
       break;
 #endif /* LWIP_TCP_KEEPALIVE */
 
     }  /* switch (optname) */
     break;
 #endif /* LWIP_TCP */
 #if LWIP_UDP && LWIP_UDPLITE
   /* Level: IPPROTO_UDPLITE */
   case IPPROTO_UDPLITE:
     switch (optname) {
     case UDPLITE_SEND_CSCOV:
       *(int*)optval = sock->conn->pcb.udp->chksum_len_tx;
       LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_getsockopt(%d, IPPROTO_UDPLITE, UDPLITE_SEND_CSCOV) = %d\n",
                   s, (*(int*)optval)) );
       break;
     case UDPLITE_RECV_CSCOV:
       *(int*)optval = sock->conn->pcb.udp->chksum_len_rx;
       LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_getsockopt(%d, IPPROTO_UDPLITE, UDPLITE_RECV_CSCOV) = %d\n",
                   s, (*(int*)optval)) );
       break;
     }  /* switch (optname) */
     break;
 #endif /* LWIP_UDP */
   } /* switch (level) */
   sys_sem_signal(sock->conn->op_completed);
 }
 
 int
 lwip_setsockopt(int s, int level, int optname, const void *optval, socklen_t optlen)
 {
   struct lwip_socket *sock = get_socket(s);
   int err = ERR_OK;
   struct lwip_setgetsockopt_data data;
 
   if (!sock)
     return -1;
 
   if (NULL == optval) {
     sock_set_errno(sock, EFAULT);
     return -1;
   }
 
   /* Do length and type checks for the various options first, to keep it readable. */
   switch (level) {
 
 /* Level: SOL_SOCKET */
   case SOL_SOCKET:
     switch (optname) {
 
     case SO_BROADCAST:
     /* UNIMPL case SO_DEBUG: */
     /* UNIMPL case SO_DONTROUTE: */
     case SO_KEEPALIVE:
     /* UNIMPL case case SO_CONTIMEO: */
     /* UNIMPL case case SO_SNDTIMEO: */
 #if LWIP_SO_RCVTIMEO
     case SO_RCVTIMEO:
 #endif /* LWIP_SO_RCVTIMEO */
 #if LWIP_SO_RCVBUF
     case SO_RCVBUF:
 #endif /* LWIP_SO_RCVBUF */
     /* UNIMPL case SO_OOBINLINE: */
     /* UNIMPL case SO_SNDBUF: */
     /* UNIMPL case SO_RCVLOWAT: */
     /* UNIMPL case SO_SNDLOWAT: */
 #if SO_REUSE
     case SO_REUSEADDR:
     case SO_REUSEPORT:
 #endif /* SO_REUSE */
     /* UNIMPL case SO_USELOOPBACK: */
       if (optlen < sizeof(int)) {
         err = EINVAL;
       }
       break;
     case SO_NO_CHECK:
       if (optlen < sizeof(int)) {
         err = EINVAL;
       }
 #if LWIP_UDP
       if ((sock->conn->type != NETCONN_UDP) ||
           ((udp_flags(sock->conn->pcb.udp) & UDP_FLAGS_UDPLITE) != 0)) {
         /* this flag is only available for UDP, not for UDP lite */
         err = EAFNOSUPPORT;
       }
 #endif /* LWIP_UDP */
       break;
     default:
       LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_setsockopt(%d, SOL_SOCKET, UNIMPL: optname=0x%x, ..)\n",
                   s, optname));
       err = ENOPROTOOPT;
     }  /* switch (optname) */
     break;
 
 /* Level: IPPROTO_IP */
   case IPPROTO_IP:
     switch (optname) {
     /* UNIMPL case IP_HDRINCL: */
     /* UNIMPL case IP_RCVDSTADDR: */
     /* UNIMPL case IP_RCVIF: */
     case IP_TTL:
     case IP_TOS:
       if (optlen < sizeof(int)) {
         err = EINVAL;
       }
       break;
 #if LWIP_IGMP
     case IP_MULTICAST_TTL:
       if (optlen < sizeof(u8_t)) {
         err = EINVAL;
       }
       if (NETCONNTYPE_GROUP(sock->conn->type) != NETCONN_UDP) {
         err = EAFNOSUPPORT;
       }
       break;
     case IP_MULTICAST_IF:
       if (optlen < sizeof(struct in_addr)) {
         err = EINVAL;
       }
       if (NETCONNTYPE_GROUP(sock->conn->type) != NETCONN_UDP) {
         err = EAFNOSUPPORT;
       }
       break;
     case IP_ADD_MEMBERSHIP:
     case IP_DROP_MEMBERSHIP:
       if (optlen < sizeof(struct ip_mreq)) {
         err = EINVAL;
       }
       if (NETCONNTYPE_GROUP(sock->conn->type) != NETCONN_UDP) {
         err = EAFNOSUPPORT;
       }
       break;
 #endif /* LWIP_IGMP */
       default:
         LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_setsockopt(%d, IPPROTO_IP, UNIMPL: optname=0x%x, ..)\n",
                     s, optname));
         err = ENOPROTOOPT;
     }  /* switch (optname) */
     break;
 
 #if LWIP_TCP
 /* Level: IPPROTO_TCP */
   case IPPROTO_TCP:
     if (optlen < sizeof(int)) {
       err = EINVAL;
       break;
     }
 
     /* If this is no TCP socket, ignore any options. */
     if (sock->conn->type != NETCONN_TCP)
       return 0;
 
     switch (optname) {
     case TCP_NODELAY:
     case TCP_KEEPALIVE:
 #if LWIP_TCP_KEEPALIVE
     case TCP_KEEPIDLE:
     case TCP_KEEPINTVL:
     case TCP_KEEPCNT:
 #endif /* LWIP_TCP_KEEPALIVE */
       break;
 
     default:
       LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_setsockopt(%d, IPPROTO_TCP, UNIMPL: optname=0x%x, ..)\n",
                   s, optname));
       err = ENOPROTOOPT;
     }  /* switch (optname) */
     break;
 #endif /* LWIP_TCP */
 #if LWIP_UDP && LWIP_UDPLITE
 /* Level: IPPROTO_UDPLITE */
   case IPPROTO_UDPLITE:
     if (optlen < sizeof(int)) {
       err = EINVAL;
       break;
     }
 
     /* If this is no UDP lite socket, ignore any options. */
     if (sock->conn->type != NETCONN_UDPLITE)
       return 0;
 
     switch (optname) {
     case UDPLITE_SEND_CSCOV:
     case UDPLITE_RECV_CSCOV:
       break;
 
     default:
       LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_setsockopt(%d, IPPROTO_UDPLITE, UNIMPL: optname=0x%x, ..)\n",
                   s, optname));
       err = ENOPROTOOPT;
     }  /* switch (optname) */
     break;
 #endif /* LWIP_UDP && LWIP_UDPLITE */
 /* UNDEFINED LEVEL */
   default:
     LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_setsockopt(%d, level=0x%x, UNIMPL: optname=0x%x, ..)\n",
                 s, level, optname));
     err = ENOPROTOOPT;
   }  /* switch (level) */
 
 
   if (err != ERR_OK) {
     sock_set_errno(sock, err);
     return -1;
   }
 
 
   /* Now do the actual option processing */
   data.sock = sock;
   data.level = level;
   data.optname = optname;
   data.optval = (void*)optval;
   data.optlen = &optlen;
   data.err = err;
   tcpip_callback(lwip_setsockopt_internal, &data);
   sys_arch_sem_wait(sock->conn->op_completed, 0);
   /* maybe lwip_setsockopt_internal has changed err */
   err = data.err;
 
   sock_set_errno(sock, err);
   return err ? -1 : 0;
 }
 
 static void
 lwip_setsockopt_internal(void *arg)
 {
   struct lwip_socket *sock;
 #ifdef LWIP_DEBUG
   int s;
 #endif /* LWIP_DEBUG */
   int level, optname;
   const void *optval;
   struct lwip_setgetsockopt_data *data;
 
   LWIP_ASSERT("arg != NULL", arg != NULL);
 
   data = (struct lwip_setgetsockopt_data*)arg;
   sock = data->sock;
 #ifdef LWIP_DEBUG
   s = data->s;
 #endif /* LWIP_DEBUG */
   level = data->level;
   optname = data->optname;
   optval = data->optval;
 
   switch (level) {
 
 /* Level: SOL_SOCKET */
   case SOL_SOCKET:
     switch (optname) {
 
     /* The option flags */
     case SO_BROADCAST:
     /* UNIMPL case SO_DEBUG: */
     /* UNIMPL case SO_DONTROUTE: */
     case SO_KEEPALIVE:
     /* UNIMPL case SO_OOBINCLUDE: */
 #if SO_REUSE
     case SO_REUSEADDR:
     case SO_REUSEPORT:
 #endif /* SO_REUSE */
     /* UNIMPL case SO_USELOOPBACK: */
       if (*(int*)optval) {
         sock->conn->pcb.ip->so_options |= optname;
       } else {
         sock->conn->pcb.ip->so_options &= ~optname;
       }
       LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_setsockopt(%d, SOL_SOCKET, optname=0x%x, ..) -> %s\n",
                   s, optname, (*(int*)optval?"on":"off")));
       break;
 #if LWIP_SO_RCVTIMEO
     case SO_RCVTIMEO:
       sock->conn->recv_timeout = ( *(int*)optval );
       break;
 #endif /* LWIP_SO_RCVTIMEO */
 #if LWIP_SO_RCVBUF
     case SO_RCVBUF:
       sock->conn->recv_bufsize = ( *(int*)optval );
       break;
 #endif /* LWIP_SO_RCVBUF */
 #if LWIP_UDP
     case SO_NO_CHECK:
       if (*(int*)optval) {
         udp_setflags(sock->conn->pcb.udp, udp_flags(sock->conn->pcb.udp) | UDP_FLAGS_NOCHKSUM);
       } else {
         udp_setflags(sock->conn->pcb.udp, udp_flags(sock->conn->pcb.udp) & ~UDP_FLAGS_NOCHKSUM);
       }
       break;
 #endif /* LWIP_UDP */
     }  /* switch (optname) */
     break;
 
 /* Level: IPPROTO_IP */
   case IPPROTO_IP:
     switch (optname) {
     case IP_TTL:
       sock->conn->pcb.ip->ttl = (u8_t)(*(int*)optval);
       LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_setsockopt(%d, IPPROTO_IP, IP_TTL, ..) -> %d\n",
                   s, sock->conn->pcb.ip->ttl));
       break;
     case IP_TOS:
       sock->conn->pcb.ip->tos = (u8_t)(*(int*)optval);
       LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_setsockopt(%d, IPPROTO_IP, IP_TOS, ..)-> %d\n",
                   s, sock->conn->pcb.ip->tos));
       break;
 #if LWIP_IGMP
     case IP_MULTICAST_TTL:
       sock->conn->pcb.udp->ttl = (u8_t)(*(u8_t*)optval);
       break;
     case IP_MULTICAST_IF:
       sock->conn->pcb.udp->multicast_ip.addr = ((struct in_addr*) optval)->s_addr;
       break;
     case IP_ADD_MEMBERSHIP:
     case IP_DROP_MEMBERSHIP:
       {
         /* If this is a TCP or a RAW socket, ignore these options. */
         struct ip_mreq *imr = (struct ip_mreq *)optval;
         if(optname == IP_ADD_MEMBERSHIP){
           data->err = igmp_joingroup((struct ip_addr*)&(imr->imr_interface.s_addr), (struct ip_addr*)&(imr->imr_multiaddr.s_addr));
         } else {
           data->err = igmp_leavegroup((struct ip_addr*)&(imr->imr_interface.s_addr), (struct ip_addr*)&(imr->imr_multiaddr.s_addr));
         }
         if(data->err != ERR_OK) {
           data->err = EADDRNOTAVAIL;
         }
       }
       break;
 #endif /* LWIP_IGMP */
     }  /* switch (optname) */
     break;
 
 #if LWIP_TCP
 /* Level: IPPROTO_TCP */
   case IPPROTO_TCP:
     switch (optname) {
     case TCP_NODELAY:
       if (*(int*)optval) {
         tcp_nagle_disable(sock->conn->pcb.tcp);
       } else {
         tcp_nagle_enable(sock->conn->pcb.tcp);
       }
       LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_setsockopt(%d, IPPROTO_TCP, TCP_NODELAY) -> %s\n",
                   s, (*(int *)optval)?"on":"off") );
       break;
     case TCP_KEEPALIVE:
       sock->conn->pcb.tcp->keep_idle = (u32_t)(*(int*)optval);
       LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_setsockopt(%d, IPPROTO_TCP, TCP_KEEPALIVE) -> %"U32_F"\n",
                   s, sock->conn->pcb.tcp->keep_idle));
       break;
 
 #if LWIP_TCP_KEEPALIVE
     case TCP_KEEPIDLE:
       sock->conn->pcb.tcp->keep_idle = 1000*(u32_t)(*(int*)optval);
       LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_setsockopt(%d, IPPROTO_TCP, TCP_KEEPIDLE) -> %"U32_F"\n",
                   s, sock->conn->pcb.tcp->keep_idle));
       break;
     case TCP_KEEPINTVL:
       sock->conn->pcb.tcp->keep_intvl = 1000*(u32_t)(*(int*)optval);
       LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_setsockopt(%d, IPPROTO_TCP, TCP_KEEPINTVL) -> %"U32_F"\n",
                   s, sock->conn->pcb.tcp->keep_intvl));
       break;
     case TCP_KEEPCNT:
       sock->conn->pcb.tcp->keep_cnt = (u32_t)(*(int*)optval);
       LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_setsockopt(%d, IPPROTO_TCP, TCP_KEEPCNT) -> %"U32_F"\n",
                   s, sock->conn->pcb.tcp->keep_cnt));
       break;
 #endif /* LWIP_TCP_KEEPALIVE */
 
     }  /* switch (optname) */
     break;
 #endif /* LWIP_TCP*/
 #if LWIP_UDP && LWIP_UDPLITE
   /* Level: IPPROTO_UDPLITE */
   case IPPROTO_UDPLITE:
     switch (optname) {
     case UDPLITE_SEND_CSCOV:
       if ((*(int*)optval != 0) && (*(int*)optval < 8)) {
         /* don't allow illegal values! */
         sock->conn->pcb.udp->chksum_len_tx = 8;
       } else {
         sock->conn->pcb.udp->chksum_len_tx = *(int*)optval;
       }
       LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_setsockopt(%d, IPPROTO_UDPLITE, UDPLITE_SEND_CSCOV) -> %d\n",
                   s, (*(int*)optval)) );
       break;
     case UDPLITE_RECV_CSCOV:
       if ((*(int*)optval != 0) && (*(int*)optval < 8)) {
         /* don't allow illegal values! */
         sock->conn->pcb.udp->chksum_len_rx = 8;
       } else {
         sock->conn->pcb.udp->chksum_len_rx = *(int*)optval;
       }
       LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_setsockopt(%d, IPPROTO_UDPLITE, UDPLITE_RECV_CSCOV) -> %d\n",
                   s, (*(int*)optval)) );
       break;
     }  /* switch (optname) */
     break;
 #endif /* LWIP_UDP */
   }  /* switch (level) */
   sys_sem_signal(sock->conn->op_completed);
 }
 
 int
 lwip_ioctl(int s, long cmd, void *argp)
 {
   struct lwip_socket *sock = get_socket(s);
   u16_t buflen = 0;
   s16_t recv_avail;
 
   if (!sock)
     return -1;
 
   switch (cmd) {
   case FIONREAD:
     if (!argp) {
       sock_set_errno(sock, EINVAL);
       return -1;
     }
 
     SYS_ARCH_GET(sock->conn->recv_avail, recv_avail);
     if (recv_avail < 0)
       recv_avail = 0;
     *((u16_t*)argp) = (u16_t)recv_avail;
 
     /* Check if there is data left from the last recv operation. /maq 041215 */
     if (sock->lastdata) {
       buflen = netbuf_len(sock->lastdata);
       buflen -= sock->lastoffset;
 
       *((u16_t*)argp) += buflen;
     }
 
     LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_ioctl(%d, FIONREAD, %p) = %"U16_F"\n", s, argp, *((u16_t*)argp)));
     sock_set_errno(sock, 0);
     return 0;
 
   case FIONBIO:
     if (argp && *(u32_t*)argp)
       sock->flags |= O_NONBLOCK;
     else
       sock->flags &= ~O_NONBLOCK;
     LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_ioctl(%d, FIONBIO, %d)\n", s, !!(sock->flags & O_NONBLOCK)));
     sock_set_errno(sock, 0);
     return 0;
 
   default:
     LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_ioctl(%d, UNIMPL: 0x%lx, %p)\n", s, cmd, argp));
     sock_set_errno(sock, ENOSYS); /* not yet implemented */
     return -1;
   } /* switch (cmd) */
 }
 
 #endif /* LWIP_SOCKET */