xsh_memstat.c File Reference

#include <xinu.h>
#include <stdio.h>
#include <string.h>

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Functions
static void	printFreeList (void)
static void	printMemUse (void)
void	start (void)
shellcmd	xsh_memstat (int nargs, char *args[])

Variables
void *	_end

Function Documentation

printFreeList()

static void printFreeList ( void  )

static

Definition at line 50 of file xsh_memstat.c.

References _end, memlist, memblk::mlength, memblk::mnext, NULL, printf(), and start().

Referenced by xsh_memstat().

{
    struct memblk *block;

    /* Output a heading for the free list */

    printf("Free List:\n");
    printf("Block address  Length (dec)  Length (hex)\n");
    printf("-------------  ------------  ------------\n");
    
    for (block = memlist.mnext; block != NULL; block = block->mnext) {
        printf("  0x%08x    %9d     0x%08x\n", block,
            block->mlength, block->mlength);
    }
    printf("\n");
}

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printMemUse()

static void printMemUse ( void  )

static

Definition at line 74 of file xsh_memstat.c.

References _end, memlist, memblk::mlength, memblk::mnext, NPROC, NULL, PR_FREE, printf(), proctab, and start().

Referenced by xsh_memstat().

{
    int i;              /* Index into process table */
    uint32 code = 0;        /* Total Xinu code memory   */
    uint32 stack = 0;       /* Total used stack memory  */
    uint32 kheap = 0;       /* Free kernel heap memory  */
    uint32 kfree = 0;       /* Total free memory        */
    struct memblk *block;       /* Ptr to memory block      */

    /* Calculate amount of text memory */

    code = (uint32)&_end - (uint32)start;

    /* Calculate amount of allocated stack memory */
    /*  Skip the NULL process since it has a private stack */

    for (i = 1; i < NPROC; i++) {
        if (proctab[i].prstate != PR_FREE) {
            stack += (uint32)proctab[i].prstklen;
        }
    }

    /* Calculate the amount of memory on the free list */

    for (block = memlist.mnext; block != NULL; block = block->mnext) {
        kfree += block->mlength;
    }

    /* Calculate the amount of free kernel heap memory */

    kheap = kfree - stack;

    /* Output statistics on current memory use */

    printf("Current system memory statistics:\n");
    printf("---------------------------------\n");
    printf("%10d bytes (0x%08x) of Xinu code\n", code, code);
    printf("%10d bytes (0x%08x) of allocated stack space\n", stack, stack);
    printf("%10d bytes (0x%08x) of available kernel heap space\n\n", kheap, kheap);
}

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start()

void start

(

void

)

Referenced by printFreeList(), and printMemUse().

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xsh_memstat()

shellcmd xsh_memstat	(	int	nargs,
		char *	args[]
	)

Definition at line 14 of file xsh_memstat.c.

References fprintf(), printf(), printFreeList(), printMemUse(), stderr, and strncmp().

{

    /* For argument '--help', emit help about the 'memstat' command */

    if (nargs == 2 && strncmp(args[1], "--help", 7) == 0) {
        printf("use: %s \n\n", args[0]);
        printf("Description:\n");
        printf("\tDisplays the current memory use and prints the\n");
        printf("\tfree list.\n");
        printf("Options:\n");
        printf("\t--help\t\tdisplay this help and exit\n");
        return 0;
    }

    /* Check for valid number of arguments */

    if (nargs > 1) {
        fprintf(stderr, "%s: too many arguments\n", args[0]);
        fprintf(stderr, "Try '%s --help' for more information\n",
                args[0]);
        return 1;
    }

    printMemUse();
    printFreeList();

    return 0;
}

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Variable Documentation

_end

void* _end

Referenced by printFreeList(), and printMemUse().