}  memset(&sin, 0, sizeof(sin));  sin.sin_len = sizeof(sin);  sin.sin_family = AF_INET;  /* get the IP address and port of the remote host */  netconn_peer(sock->conn, &naddr, &sin.sin_port);  LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_getpeername(%d, addr=", s));  ip_addr_debug_print(SOCKETS_DEBUG, &naddr);  LWIP_DEBUGF(SOCKETS_DEBUG, (" port=%d)\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_getsockname (int s, struct sockaddr *name, socklen_t *namelen){  struct lwip_socket *sock;  struct sockaddr_in sin;  struct ip_addr *naddr;  sock = get_socket(s);  if (!sock) {    set_errno(EBADF);    return -1;  }  memset(&sin, 0, sizeof(sin));  sin.sin_len = sizeof(sin);  sin.sin_family = AF_INET;  /* get the IP address and port of the remote host */  netconn_addr(sock->conn, &naddr, &sin.sin_port);  LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_getsockname(%d, addr=", s));  ip_addr_debug_print(SOCKETS_DEBUG, naddr);  LWIP_DEBUGF(SOCKETS_DEBUG, (" port=%d)\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_getsockopt (int s, int level, int optname, void *optval, socklen_t *optlen){  int err = 0;  struct lwip_socket *sock = get_socket(s);  if(!sock) {   	set_errno(EBADF);    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_OOBINLINE: */      /* UNIMPL case SO_RCVBUF: */      /* 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;      default:        LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_getsockopt(%d, SOL_SOCKET, UNIMPL: optname=0x%x, ..)\n", s, optname));        err = ENOPROTOOPT;      }  /* switch */      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;      default:        LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_getsockopt(%d, IPPROTO_IP, UNIMPL: optname=0x%x, ..)\n", s, optname));        err = ENOPROTOOPT;      }  /* switch */      break;         /* 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:        break;               default:        LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_getsockopt(%d, IPPROTO_TCP, UNIMPL: optname=0x%x, ..)\n", s, optname));        err = ENOPROTOOPT;      }  /* switch */      break;/* 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( 0 != err ) {    sock_set_errno(sock, err);    return -1;  }     /* Now do the actual option processing */  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.tcp->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 (sock->conn->type) {      case NETCONN_RAW:        *(int*)optval = SOCK_RAW;        break;      case NETCONN_TCP:        *(int*)optval = SOCK_STREAM;        break;      case NETCONN_UDP:      case NETCONN_UDPLITE:      case NETCONN_UDPNOCHKSUM:        *(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 */      LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_getsockopt(%d, SOL_SOCKET, SO_TYPE) = %d\n", s, *(int *)optval));      break;    case SO_ERROR:      *(int *)optval = sock->err;      sock->err = 0;      LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_getsockopt(%d, SOL_SOCKET, SO_ERROR) = %d\n", s, *(int *)optval));      break;    }  /* switch */    break;/* Level: IPPROTO_IP */  case IPPROTO_IP:    switch( optname ) {    case IP_TTL:      *(int*)optval = sock->conn->pcb.tcp->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.tcp->tos;      LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_getsockopt(%d, IPPROTO_IP, IP_TOS) = %d\n", s, *(int *)optval));      break;    }  /* switch */    break;/* Level: IPPROTO_TCP */  case IPPROTO_TCP:    switch( optname ) {    case TCP_NODELAY:      *(int*)optval = (sock->conn->pcb.tcp->flags & TF_NODELAY);      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->keepalive;      LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_getsockopt(%d, IPPROTO_IP, TCP_KEEPALIVE) = %d\n", s, *(int *)optval));      break;    }  /* switch */    break;  }  sock_set_errno(sock, err);  return err ? -1 : 0;}int lwip_setsockopt (int s, int level, int optname, const void *optval, socklen_t optlen){  struct lwip_socket *sock = get_socket(s);  int err = 0;  if(!sock) {   	set_errno(EBADF);    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 SO_OOBINLINE: */    /* UNIMPL case SO_RCVBUF: */    /* 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;    default:      LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_setsockopt(%d, SOL_SOCKET, UNIMPL: optname=0x%x, ..)\n", s, optname));      err = ENOPROTOOPT;    }  /* switch */    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;      default:      LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_setsockopt(%d, IPPROTO_IP, UNIMPL: optname=0x%x, ..)\n", s, optname));      err = ENOPROTOOPT;    }  /* switch */    break;/* 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:      break;    default:      LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_setsockopt(%d, IPPROTO_TCP, UNIMPL: optname=0x%x, ..)\n", s, optname));      err = ENOPROTOOPT;    }  /* switch */    break;/* UNDEFINED LEVEL */        default:    LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_setsockopt(%d, level=0x%x, UNIMPL: optname=0x%x, ..)\n", s, level, optname));    err = ENOPROTOOPT;  }  /* switch */  if( 0 != err ) {    sock_set_errno(sock, err);    return -1;  }  /* Now do the actual option processing */  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.tcp->so_options |= optname;      } else {        sock->conn->pcb.tcp->so_options &= ~optname;      }      LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_setsockopt(%d, SOL_SOCKET, optname=0x%x, ..) -> %s\n", s, optname, (*(int*)optval?"on":"off")));      break;    }  /* switch */    break;/* Level: IPPROTO_IP */  case IPPROTO_IP:    switch( optname ) {    case IP_TTL:      sock->conn->pcb.tcp->ttl = (u8_t)(*(int*)optval);      LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_setsockopt(%d, IPPROTO_IP, IP_TTL, ..) -> %u\n", s, sock->conn->pcb.tcp->ttl));      break;    case IP_TOS:      sock->conn->pcb.tcp->tos = (u8_t)(*(int*)optval);      LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_setsockopt(%d, IPPROTO_IP, IP_TOS, ..)-> %u\n", s, sock->conn->pcb.tcp->tos));      break;    }  /* switch */    break;/* Level: IPPROTO_TCP */  case IPPROTO_TCP:    switch( optname ) {    case TCP_NODELAY:      if ( *(int*)optval ) {        sock->conn->pcb.tcp->flags |= TF_NODELAY;      } else {        sock->conn->pcb.tcp->flags &= ~TF_NODELAY;      }      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->keepalive = (u32_t)(*(int*)optval);      LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_setsockopt(%d, IPPROTO_TCP, TCP_KEEPALIVE) -> %lu\n", s, sock->conn->pcb.tcp->keepalive));      break;    }  /* switch */    break;  }  /* switch */  sock_set_errno(sock, err);  return err ? -1 : 0;}int lwip_ioctl(int s, long cmd, void *argp){  struct lwip_socket *sock = get_socket(s);  if(!sock) {   	set_errno(EBADF);    return -1;  }  switch (cmd) {  case FIONREAD:    if (!argp) {      sock_set_errno(sock, EINVAL);      return -1;    }    *((u16_t*)argp) = sock->conn->recv_avail;    LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_ioctl(%d, FIONREAD, %p) = %u\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;  }}