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   The `mmalloc' functions contain no internal static state.  All
`mmalloc' internal data is allocated in the mapped in region, along
with the user data that it manages.  This allows it to manage multiple
such regions and to "pick up where it left off" when such regions are
later dynamically mapped back in.

   In some sense, malloc has been "purified" to contain no internal
state information and generalized to use multiple memory regions rather
than a single region managed by `sbrk'.  However the new routines now
need an extra parameter which informs `mmalloc' which memory region it
is dealing with (along with other information).  This parameter is
called the "malloc descriptor".

   The functions initially provided by `mmalloc' are:

     void *mmalloc_attach (int fd, void *baseaddr);
     void *mmalloc_detach (void *md);
     int mmalloc_errno (void *md);
     int mmalloc_setkey (void *md, int keynum, void *key);
     void *mmalloc_getkey (void *md, int keynum);
     void *mmalloc (void *md, size_t size);
     void *mrealloc (void *md, void *ptr, size_t size);
     void *mvalloc (void *md, size_t size);
     void mfree (void *md, void *ptr);

* Compatibility
Backwards Compatibility
* Functions
Function Descriptions

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