bogus mbuf calculations

[unix-history] / usr / src / usr.bin / netstat / mbuf.c

#ifndef lint
static char sccsid[] = "@(#)mbuf.c      4.7 84/11/16";
#endif

#include <sys/param.h>
#include <sys/mbuf.h>

struct  mbstat mbstat;
extern  int kmem;

static struct mbtypes {
       int     mt_type;
       char    *mt_name;
} mbtypes[] = {
       { MT_DATA,      "data" },
       { MT_HEADER,    "packet headers" },
       { MT_SOCKET,    "socket structures" },
       { MT_PCB,       "protocol control blocks" },
       { MT_RTABLE,    "routing table entries" },
       { MT_HTABLE,    "IMP host table entries" },
       { MT_ATABLE,    "address resolution tables" },
       { MT_FTABLE,    "fragment reassembly queue headers" },
       { MT_SONAME,    "socket names and addresses" },
       { MT_ZOMBIE,    "zombie process information" },
       { MT_SOOPTS,    "socket options" },
       { MT_RIGHTS,    "access rights" },
       { 0, 0 }
};

/*
* Print mbuf statistics.
*/
mbpr(mbaddr)
       off_t mbaddr;
{
       register int totmem, totfree, totmbufs;
       register struct mbtypes *mp;

       if (mbaddr == 0) {
               printf("mbstat: symbol not in namelist\n");
               return;
       }
       klseek(kmem, mbaddr, 0);
       if (read(kmem, &mbstat, sizeof (mbstat)) != sizeof (mbstat)) {
               printf("mbstat: bad read\n");
               return;
       }
       printf("%d/%d mbufs in use:\n",
               mbstat.m_mbufs - mbstat.m_mtypes[MT_FREE], mbstat.m_mbufs);
       totmbufs = 0;
       for (mp = mbtypes; mp->mt_name; mp++)
               if (mbstat.m_mtypes[mp->mt_type]) {
                       printf("\t%d mbufs allocated to %s\n",
                               mbstat.m_mtypes[mp->mt_type], mp->mt_name);
                       totmbufs += mbstat.m_mtypes[mp->mt_type];
               }
       if (totmbufs != mbstat.m_mbufs - mbstat.m_mtypes[MT_FREE])
               printf("*** %d mbufs missing ***\n",
                       (mbstat.m_mbufs - mbstat.m_mtypes[MT_FREE]) - totmbufs);
       printf("%d/%d mapped pages in use\n",
               mbstat.m_clusters - mbstat.m_clfree, mbstat.m_clusters);
       totmem = mbstat.m_mbufs * MSIZE + mbstat.m_clusters * CLBYTES;
       totfree = mbstat.m_mtypes[MT_FREE]*MSIZE + mbstat.m_clfree * CLBYTES;
       printf("%d Kbytes allocated to network (%d%% in use)\n",
               totmem / 1024, (totmem - totfree) * 100 / totmem);
       printf("%d requests for memory denied\n", mbstat.m_drops);
}