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Annotation of xinu/sys/shell/x_mem.c, revision 1.1.1.1

1.1       root        1: /* x_mem.c - x_mem */
                      2: 
                      3: #include <conf.h>
                      4: #include <kernel.h>
                      5: #include <proc.h>
                      6: #include <mem.h>
                      7: 
                      8: /*------------------------------------------------------------------------
                      9:  *  x_mem  -  (command mem) print memory use and free list information
                     10:  *------------------------------------------------------------------------
                     11:  */
                     12: COMMAND        x_mem(stdin, stdout, stderr, nargs, args)
                     13: int    stdin, stdout, stderr, nargs;
                     14: char   *args[];
                     15: {
                     16:        int     i;
                     17:        struct  mblock  *mptr;
                     18:        char    str[80];
                     19:        unsigned free;
                     20:        unsigned avail;
                     21:        unsigned stkmem;
                     22: 
                     23:        /* calculate current size of free memory and stack memory */
                     24: 
                     25:        for( free=0,mptr=memlist.mnext ; mptr!=(struct mblock *)NULL ;
                     26:             mptr=mptr->mnext)
                     27:                free += mptr->mlen;
                     28:        for (stkmem=0,i=0 ; i<NPROC ; i++) {
                     29:                if (proctab[i].pstate != PRFREE)
                     30:                        stkmem += (unsigned)proctab[i].pstklen;
                     31:        }
                     32:        sprintf(str,
                     33:                "Memory: %u bytes real memory, %u text, %u data, %u bss\n",
                     34:                1 + maxaddr, (unsigned) &etext,
                     35:                (unsigned) &edata - (unsigned) &etext,
                     36:                (unsigned) &end - (unsigned) &edata);
                     37:        write(stdout, str, strlen(str));
                     38:        avail = (unsigned)maxaddr - (unsigned) &end + sizeof(int);
                     39:        sprintf(str," initially: %7u avail\n", avail);
                     40:        write(stdout, str, strlen(str));
                     41:        sprintf(str," presently: %7u avail, %5u stack, %5u heap\n",
                     42:                free, stkmem, avail - stkmem - free);
                     43:        write(stdout, str, strlen(str));
                     44:        sprintf(str," free list:\n");
                     45:        write(stdout, str, strlen(str));
                     46:        for( mptr=memlist.mnext ; mptr!=(struct mblock *)NULL ;
                     47:             mptr=mptr->mnext) {
                     48:                sprintf(str,"   block at %6x, length %5u (0x%x)\n",
                     49:                        mptr, mptr->mlen, mptr->mlen);
                     50:                write(stdout, str, strlen(str));
                     51:        }
                     52:        return(OK);
                     53: }

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