uclibc-ng/libc/stdlib/malloc-standard/mallinfo.c

/*
  This is a version (aka dlmalloc) of malloc/free/realloc written by
  Doug Lea and released to the public domain.  Use, modify, and
  redistribute this code without permission or acknowledgement in any
  way you wish.  Send questions, comments, complaints, performance
  data, etc to dl@cs.oswego.edu

  VERSION 2.7.2 Sat Aug 17 09:07:30 2002  Doug Lea  (dl at gee)

  Note: There may be an updated version of this malloc obtainable at
           ftp://gee.cs.oswego.edu/pub/misc/malloc.c
  Check before installing!

  Hacked up for uClibc by Erik Andersen <andersen@codepoet.org>
*/

#include "malloc.h"


/* ------------------------------ mallinfo ------------------------------ */
struct mallinfo mallinfo(void)
{
    mstate av;
    struct mallinfo mi;
    int i;
    mbinptr b;
    mchunkptr p;
    size_t avail;
    size_t fastavail;
    int nblocks;
    int nfastblocks;

    LOCK;
    av = get_malloc_state();
    /* Ensure initialization */
    if (av->top == 0)  {
	__malloc_consolidate(av);
    }

    check_malloc_state();

    /* Account for top */
    avail = chunksize(av->top);
    nblocks = 1;  /* top always exists */

    /* traverse fastbins */
    nfastblocks = 0;
    fastavail = 0;

    for (i = 0; i < NFASTBINS; ++i) {
	for (p = av->fastbins[i]; p != 0; p = p->fd) {
	    ++nfastblocks;
	    fastavail += chunksize(p);
	}
    }

    avail += fastavail;

    /* traverse regular bins */
    for (i = 1; i < NBINS; ++i) {
	b = bin_at(av, i);
	for (p = last(b); p != b; p = p->bk) {
	    ++nblocks;
	    avail += chunksize(p);
	}
    }

    mi.smblks = nfastblocks;
    mi.ordblks = nblocks;
    mi.fordblks = avail;
    mi.uordblks = av->sbrked_mem - avail;
    mi.arena = av->sbrked_mem;
    mi.hblks = av->n_mmaps;
    mi.hblkhd = av->mmapped_mem;
    mi.fsmblks = fastavail;
    mi.keepcost = chunksize(av->top);
    mi.usmblks = av->max_total_mem;
    UNLOCK;
    return mi;
}