int mmalloc_errno (void *md);
int mmalloc_setkey (void *md, int keynum, void *key);
void *mmalloc_getkey (void *md, int keynum);
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+
void *mmalloc (void *md, size_t size);
void *mrealloc (void *md, void *ptr, size_t size);
void *mvalloc (void *md, size_t size);