the problem for FIONREAD with lwip_ioctl/ioctlsocket).

  2007-11-01 Fr閐閞ic Bernon, Marc Chaland
  * sockets.h, sockets.c, api.h, api_lib.c, api_msg.h, api_msg.c, tcp.h, tcp_out.c:
    Integrate "patch #6250 : MSG_MORE flag for send". MSG_MORE is used at socket api
    layer, NETCONN_MORE at netconn api layer, and TCP_WRITE_FLAG_MORE at raw api
    layer. This option enable to delayed TCP PUSH flag on multiple "write" calls.
    Note that previous "copy" parameter for "write" APIs is now called "apiflags".

  2007-10-24 Fr閐閞ic Bernon
  * api.h, api_lib.c, api_msg.c: Add macro API_EVENT in the same spirit than 
    TCP_EVENT_xxx macros to get a code more readable. It could also help to remove
    some code (like we have talk in "patch #5919 : Create compile switch to remove
    select code"), but it could be done later.

  2007-10-08 Simon Goldschmidt
  * many files: Changed initialization: many init functions are not needed any
    more since we now rely on the compiler initializing global and static
    variables to zero!

  2007-10-06 Simon Goldschmidt
  * ip_frag.c, memp.c, mib2.c, ip_frag.h, memp_std.h, opt.h: Changed IP_REASSEMBLY
    to enqueue the received pbufs so that multiple packets can be reassembled
    simultaneously and no static reassembly buffer is needed.

  2007-10-05 Simon Goldschmidt
  * tcpip.c, etharp.h, etharp.c: moved ethernet_input from tcpip.c to etharp.c so
    all netifs (or ports) can use it.

  2007-10-05 Fr閐閞ic Bernon
  * netifapi.h, netifapi.c: add function netifapi_netif_set_default. Change the 
    common function to reduce a little bit the footprint (for all functions using
    only the "netif" parameter).

  2007-10-03 Fr閐閞ic Bernon
  * netifapi.h, netifapi.c: add functions netifapi_netif_set_up, netifapi_netif_set_down,
    netifapi_autoip_start and netifapi_autoip_stop. Use a common function to reduce
    a little bit the footprint (for all functions using only the "netif" parameter).

  2007-09-15 Fr閐閞ic Bernon
  * udp.h, udp.c, sockets.c: Changes for "#20503 IGMP Improvement". Add IP_MULTICAST_IF
    option in socket API, and a new field "multicast_ip" in "struct udp_pcb" (for
    netconn and raw API users), only if LWIP_IGMP=1. Add getsockopt processing for
    IP_MULTICAST_TTL and IP_MULTICAST_IF.

  2007-09-10 Fr閐閞ic Bernon
  * snmp.h, mib2.c: enable to remove SNMP timer (which consumne several cycles
    even when it's not necessary). snmp_agent.txt tell to call snmp_inc_sysuptime()
    each 10ms (but, it's intrusive if you use sys_timeout feature). Now, you can
    decide to call snmp_add_sysuptime(100) each 1000ms (which is bigger "step", but
    call to a lower frequency). Or, you can decide to not call snmp_inc_sysuptime()
    or snmp_add_sysuptime(), and to define the SNMP_GET_SYSUPTIME(sysuptime) macro.
    This one is undefined by default in mib2.c. SNMP_GET_SYSUPTIME is called inside
    snmp_get_sysuptime(u32_t *value), and enable to change "sysuptime" value only
    when it's queried (any direct call to "sysuptime" is changed by a call to 
    snmp_get_sysuptime).

  2007-09-09 Fr閐閞ic Bernon, Bill Florac
  * igmp.h, igmp.c, netif.h, netif.c, ip.c: To enable to have interfaces with IGMP,
    and others without it, there is a new NETIF_FLAG_IGMP flag to set in netif->flags
    if you want IGMP on an interface. igmp_stop() is now called inside netif_remove().
    igmp_report_groups() is now called inside netif_set_link_up() (need to have
    LWIP_NETIF_LINK_CALLBACK=1) to resend reports once the link is up (avoid to wait
    the next query message to receive the matching multicast streams).

  2007-09-08 Fr閐閞ic Bernon
  * sockets.c, ip.h, api.h, tcp.h: declare a "struct ip_pcb" which only contains
    IP_PCB. Add in the netconn's "pcb" union a "struct ip_pcb *ip;" (no size change).
    Use this new field to access to common pcb fields (ttl, tos, so_options, etc...).
    Enable to access to these fields with LWIP_TCP=0.

  2007-09-05 Fr閐閞ic Bernon
  * udp.c, ipv4/icmp.c, ipv4/ip.c, ipv6/icmp.c, ipv6/ip6.c, ipv4/icmp.h,
    ipv6/icmp.h, opt.h: Integrate "task #7272 : LWIP_ICMP option". The new option
    LWIP_ICMP enable/disable ICMP module inside the IP stack (enable per default).
    Be careful, disabling ICMP make your product non-compliant to RFC1122, but
    help to reduce footprint, and to reduce "visibility" on the Internet.

  2007-09-05 Fr閐閞ic Bernon, Bill Florac
  * opt.h, sys.h, tcpip.c, slipif.c, ppp.c, sys_arch.txt: Change parameters list
    for sys_thread_new (see "task #7252 : Create sys_thread_new_ex()"). Two new
    parameters have to be provided: a task name, and a task stack size. For this
    one, since it's platform dependant, you could define the best one for you in
    your lwipopts.h. For port maintainers, you can just add these new parameters
    in your sys_arch.c file, and but it's not mandatory, use them in your OS
    specific functions.

  2007-09-05 Fr閐閞ic Bernon
  * inet.c, autoip.c, msg_in.c, msg_out.c, init.c: Move some build time checkings
    inside init.c for task #7142 "Sanity check user-configurable values".

  2007-09-04 Fr閐閞ic Bernon, Bill Florac
  * igmp.h, igmp.c, memp_std.h, memp.c, init.c, opt.h: Replace mem_malloc call by
    memp_malloc, and use a new MEMP_NUM_IGMP_GROUP option (see opt.h to define the
    value). It will avoid potential fragmentation problems, use a counter to know
    how many times a group is used on an netif, and free it when all applications
    leave it. MEMP_NUM_IGMP_GROUP got 8 as default value (and init.c got a sanity
    check if LWIP_IGMP!=0).

  2007-09-03 Fr閐閞ic Bernon
  * igmp.h, igmp.c, sockets.c, api_msg.c: Changes for "#20503 IGMP Improvement".
    Initialize igmp_mac_filter to NULL in netif_add (this field should be set in
    the netif's "init" function). Use the "imr_interface" field (for socket layer)
    and/or the "interface" field (for netconn layer), for join/leave operations.
    The igmp_join/leavegroup first parameter change from a netif to an ipaddr.
    This field could be a netif's ipaddr, or "any" (same meaning than ip_addr_isany).

  2007-08-30 Fr閐閞ic Bernon
  * Add netbuf.h, netbuf.c, Change api.h, api_lib.c: #7249 "Split netbuf functions
    from api/api_lib". Now netbuf API is independant of netconn, and can be used
    with other API (application based on raw API, or future "socket2" API). Ports
    maintainers just have to add src/api/netbuf.c in their makefile/projects.

  2007-08-30 Fr閐閞ic Bernon, Jonathan Larmour
  * init.c: Add first version of lwip_sanity_check for task #7142 "Sanity check
    user-configurable values".

  2007-08-29 Fr閐閞ic Bernon
  * igmp.h, igmp.c, tcpip.c, init.c, netif.c: change igmp_init and add igmp_start.
    igmp_start is call inside netif_add. Now, igmp initialization is in the same
    spirit than the others modules. Modify some IGMP debug traces.

  2007-08-29 Fr閐閞ic Bernon
  * Add init.h, init.c, Change opt.h, tcpip.c: Task  #7213 "Add a lwip_init function"
    Add lwip_init function to regroup all modules initializations, and to provide
    a place to add code for task #7142 "Sanity check user-configurable values".
    Ports maintainers should remove direct initializations calls from their code,
    and add init.c in their makefiles. Note that lwip_init() function is called
    inside tcpip_init, but can also be used by raw api users since all calls are
    disabled when matching options are disabled. Also note that their is new options
    in opt.h, you should configure in your lwipopts.h (they are enabled per default).

  2007-08-26 Marc Boucher
  * api_msg.c: do_close_internal(): Reset the callbacks and arg (conn) to NULL
    since they can under certain circumstances be called with an invalid conn
    pointer after the connection has been closed (and conn has been freed). 

  2007-08-25 Fr閐閞ic Bernon (Artem Migaev's Patch)
  * netif.h, netif.c: Integrate "patch #6163 : Function to check if link layer is up".
    Add a netif_is_link_up() function if LWIP_NETIF_LINK_CALLBACK option is set.

  2007-08-22 Fr閐閞ic Bernon
  * netif.h, netif.c, opt.h: Rename LWIP_NETIF_CALLBACK in LWIP_NETIF_STATUS_CALLBACK
    to be coherent with new LWIP_NETIF_LINK_CALLBACK option before next release.

  2007-08-22 Fr閐閞ic Bernon
  * tcpip.h, tcpip.c, ethernetif.c, opt.h: remove options ETHARP_TCPIP_INPUT &
    ETHARP_TCPIP_ETHINPUT, now, only "ethinput" code is supported, even if the 
    name is tcpip_input (we keep the name of 1.2.0 function).

  2007-08-17 Jared Grubb
  * memp_std.h, memp.h, memp.c, mem.c, stats.c: (Task #7136) Centralize mempool 
    settings into new memp_std.h and optional user file lwippools.h. This adds
    more dynamic mempools, and allows the user to create an arbitrary number of
    mempools for mem_malloc.

  2007-08-16 Marc Boucher
  * api_msg.c: Initialize newconn->state to NETCONN_NONE in accept_function;
    otherwise it was left to NETCONN_CLOSE and sent_tcp() could prematurely
    close the connection.

  2007-08-16 Marc Boucher
  * sockets.c: lwip_accept(): check netconn_peer() error return.

  2007-08-16 Marc Boucher
  * mem.c, mem.h: Added mem_calloc().

  2007-08-16 Marc Boucher
  * tcpip.c, tcpip.h memp.c, memp.h: Added distinct memp (MEMP_TCPIP_MSG_INPKT)
    for input packets to prevent floods from consuming all of MEMP_TCPIP_MSG
    and starving other message types.
    Renamed MEMP_TCPIP_MSG to MEMP_TCPIP_MSG_API

  2007-08-16 Marc Boucher
  * pbuf.c, pbuf.h, etharp.c, tcp_in.c, sockets.c: Split pbuf flags in pbuf
    type and flgs (later renamed to flags).
    Use enum pbuf_flag as pbuf_type.  Renumber PBUF_FLAG_*.
    Improved lwip_recvfrom().  TCP push now propagated.

  2007-08-16 Marc Boucher
  * ethernetif.c, contrib/ports/various: ethbroadcast now a shared global
    provided by etharp.

  2007-08-16 Marc Boucher
  * ppp_oe.c ppp_oe.h, auth.c chap.c fsm.c lcp.c ppp.c ppp.h,
    etharp.c ethernetif.c, etharp.h, opt.h tcpip.h, tcpip.c:
    Added PPPoE support and various PPP improvements.

  2007-07-25 Simon Goldschmidt
  * api_lib.c, ip_frag.c, pbuf.c, api.h, pbuf.h: Introduced pbuf_copy_partial,
    making netbuf_copy_partial use this function.

  2007-07-25 Simon Goldschmidt
  * tcp_in.c: Fix bug #20506: Slow start / initial congestion window starts with
    2 * mss (instead of 1 * mss previously) to comply with some newer RFCs and
    other stacks.

  2007-07-13 Jared Grubb (integrated by Fr閐閞ic Bernon)
  * opt.h, netif.h, netif.c, ethernetif.c: Add new configuration option to add
    a link callback in the netif struct, and functions to handle it. Be carefull
    for port maintainers to add the NETIF_FLAG_LINK_UP flag (like in ethernetif.c)
    if you want to be sure to be compatible with future changes...

  2007-06-30 Fr閐閞ic Bernon
  * sockets.h, sockets.c: Implement MSG_PEEK flag for recv/recvfrom functions.

  2007-06-21 Simon Goldschmidt
  * etharp.h, etharp.c: Combined etharp_request with etharp_raw for both
    LWIP_AUTOIP =0 and =1 to remove redundant code.

  2007-06-21 Simon Goldschmidt
  * mem.c, memp.c, mem.h, memp.h, opt.h: task #6863: Introduced the option
    MEM_USE_POOLS to use 4 pools with different sized elements instead of a
    heap. This both prevents memory fragmentation and gives a higher speed
    at the cost of more memory consumption. Turned off by default.

  2007-06-21 Simon Goldschmidt
  * api_lib.c, api_msg.c, api.h, api_msg.h: Converted the length argument of
    netconn_write (and therefore also api_msg_msg.msg.w.len) from u16_t into
    int to be able to send a bigger buffer than 64K with one time (mainly
    used from lwip_send).

  2007-06-21 Simon Goldschmidt
  * tcp.h, api_msg.c: Moved the nagle algorithm from netconn_write/do_write
    into a define (tcp_output_nagle) in tcp.h to provide it to raw api users, too.

  2007-06-21 Simon Goldschmidt
  * api.h, api_lib.c, api_msg.c: Fixed bug #20021: Moved sendbuf-processing in
    netconn_write from api_lib.c to api_msg.c to also prevent multiple context-
    changes on low memory or empty send-buffer.

  2007-06-18 Simon Goldschmidt
  * etharp.c, etharp.h: Changed etharp to use a defined hardware address length
    of 6 to avoid loading netif->hwaddr_len every time (since this file is only
    used for ethernet and struct eth_addr already had a defined length of 6).

  2007-06-17 Simon Goldschmidt
  * sockets.c, sockets.h: Implemented socket options SO_NO_CHECK for UDP sockets
    to disable UDP checksum generation on transmit.

  2007-06-13 Fr閐閞ic Bernon, Simon Goldschmidt
  * debug.h, api_msg.c: change LWIP_ERROR to use it to check errors like invalid
    pointers or parameters, and let the possibility to redefined it in cc.h. Use
    this macro to check "conn" parameter in api_msg.c functions.

  2007-06-11 Simon Goldschmidt
  * sockets.c, sockets.h: Added UDP lite support for sockets

  2007-06-10 Simon Goldschmidt
  * udp.h, opt.h, api_msg.c, ip.c, udp.c: Included switch LWIP_UDPLITE (enabled
    by default) to switch off UDP-Lite support if not needed (reduces udp.c code
    size)

  2007-06-09 Dominik Spies (integrated by Fr閐閞ic Bernon)
  * autoip.h, autoip.c, dhcp.h, dhcp.c, netif.h, netif.c, etharp.h, etharp.c, opt.h:
    AutoIP implementation available for IPv4, with new options LWIP_AUTOIP and
    LWIP_DHCP_AUTOIP_COOP if you want to cooperate with DHCP. Some tips to adapt
    (see TODO mark in the source code).

  2007-06-09 Simon Goldschmidt
  * etharp.h, etharp.c, ethernetif.c: Modified order of parameters for
    etharp_output() to match netif->output so etharp_output() can be used
    directly as netif->output to save one function call.

  2007-06-08 Simon Goldschmidt
  * netif.h, ethernetif.c, slipif.c, loopif.c: Added define
    NETIF_INIT_SNMP(netif, type, speed) to initialize per-netif snmp variables,
    added initialization of those to ethernetif, slipif and loopif.

  2007-05-18 Simon Goldschmidt
  * opt.h, ip_frag.c, ip_frag.h, ip.c: Added option IP_FRAG_USES_STATIC_BUF
    (defaulting to off for now) that can be set to 0 to send fragmented
    packets by passing PBUF_REFs down the stack.

  2007-05-23 Fr閐閞ic Bernon
  * api_lib.c: Implement SO_RCVTIMEO for accept and recv on TCP