Function internal_mallinfo

system/lib/dlmalloc.c:3568–3605

#if !NO_MALLINFO
static struct mallinfo internal_mallinfo(mstate m) {
    struct mallinfo nm = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
    ensure_initialization();
    if (!PREACTION(m)) {
        check_malloc_state(m);
        if (is_initialized(m)) {
            size_t nfree = SIZE_T_ONE; /* top always free */
            size_t mfree = m->topsize + TOP_FOOT_SIZE;
            size_t sum = mfree;
            msegmentptr s = &m->seg;
            while (s != 0) {
                mchunkptr q = align_as_chunk(s->base);
                while (segment_holds(s, q) &&
                       q != m->top && q->head != FENCEPOST_HEAD) {
                    size_t sz = chunksize(q);
                    sum += sz;
                    if (!is_inuse(q)) {
                        mfree += sz;
                        ++nfree;
                    }
                    q = next_chunk(q);
                }
                s = s->next;
            }
            
            nm.arena    = sum;
            nm.ordblks  = nfree;
            nm.hblkhd   = m->footprint - sum;
            nm.usmblks  = m->max_footprint;
            nm.uordblks = m->footprint - mfree;
            nm.fordblks = mfree;
            nm.keepcost = m->topsize;
        }
        
        POSTACTION(m);
    }
    return nm;
}
#endif /* !NO_MALLINFO */

#if !NO_MALLOC_STATS