lwip/UPGRADING

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This file lists major changes between release versions that require
ports or applications to be changed. Use it to update a port or an
application written for an older version of lwIP to correctly work
with newer versions.
(CVS HEAD)
* [Enter new changes just after this line - do not remove this line]
++ Application changes:
* Replaced struct ip_addr by typedef ip_addr_t.
* Raw API: Changed the semantics of tcp_close() (since it was rather a
shutdown before): Now the application does *NOT* get any calls to the
recv callback after calling tcp_close() - this means that it also does
not get the NULL-pbuf which tells it the remote side has closed, too!
* Raw API: When calling tcp_abort() from a raw API TCP callback function,
make sure you return ERR_ABRT to prevent accessing unallocated memory.
(ERR_ABRT now means the applicaiton has called tcp_abort!)
* Renamed mem_realloc() to mem_trim() to prevent confusion with realloc()
* Netconn API: Changed netconn_receive() and netconn_accept() to return
err_t, not a pointer to new data/netconn.
* Socket API / LWIP_SO_RCVTIMEO: when accept() or recv() time out, they
now set errno to EWOULDBLOCK/EAGAIN, not ETIMEDOUT.
++ Port changes
* Added 4 new files: def.c, timers.c, timers.h, tcp_impl.h
* Moved stack-internal parts of tcp.h to tcp_impl.h, tcp.h now only contains
the actual application programmer's API
* Separated timer implementation from sys.h/.c, moved to timers.h/.c
* Converted and semaphore functions to take pointers to sys_mbox_t/sys_sem_t;
* Converted sys_mbox_new/sys_sem_new to take pointers and return err_t;
* Added Mutex concept in sys_arch (define LWIP_COMPAT_MUTEX to let sys.h use
binary semaphores instead of mutexes - as before)
* Integrated loopif into netif.c - loopif does not have to be created by the
port any more, just define LWIP_HAVE_LOOPIF to 1.
* Netdb uses a memp pool for allocating memory when getaddrinfo() is called,
so MEMP_NUM_NETDB has to be set accordingly.
* Snmp-agent uses memp pools instead of the heap, so MEMP_NUM_SNMP_* have to
be set accordingly.
* Added define LWIP_RAND() for lwip-wide randomization (needs to be defined
in cc.h, e.g. used by igmp)
(STABLE-1.3.2)
* initial version of this file