1 /**

     2  * $Id: mem2swap.c,v 1.1.1.1 2008-04-28 17:32:53 mbroeker Exp $

     3  * $Author: mbroeker $

     4  *

     5  * mem2swpapc usage: mem2spap [<MB>]

     6  */

     7 

     8 #include <stdio.h>

     9 #include <stdlib.h>

    10 #include <unistd.h>

    11 #include <errno.h>

    12 

    13 #define N 1000

    14 

    15 #ifndef DEFAULT_MEGS

    16 #define DEFAULT_MEGS 64

    17 #endif

    18 

    19 int set_limit (int);

    20 

    21 int main (int argc, char **argv)

    22 {

    23     int i, n = 0;

    24     long int *p;

    25     long int *p_new;

    26     char *args[] = { "/usr/bin/free", "-m", NULL };

    27     int size = sizeof (*p);

    28     int megs = DEFAULT_MEGS * 1024 * 1024;

    29 

    30     if (argc == 2)

    31         megs = atoi (argv[1]) * 1024 * 1024;

    32 

    33     printf ("Mem2Swap - Version 1.0\n");

    34 

    35     if (!set_limit (megs))

    36         printf ("%d MB demanded ", megs / 1024 / 1024);

    37     else {

    38         printf ("\tUsage: %s [MEM]\n\n", argv[0]);

    39         printf ("Report bugs to mbroeker@largo.homelinux.org\n");

    40         return EXIT_FAILURE;

    41     }

    42 

    43     if ((p = malloc (N * size)) == NULL)

    44         return EXIT_SUCCESS;

    45 

    46     while (1) {

    47         for (i = 0; i < N; i++) {

    48             p[n * N + i] = size * (n * N + i);

    49         }

    50         if ((p_new = realloc (p, (++n + 1) * N * size)))

    51             p = p_new;

    52         else

    53             break;

    54     }

    55 

    56     if (p) {

    57         printf ("and %ld MB allocated\n", p[n * N - 1] / 1024 / 1024);

    58         free (p);

    59     }

    60 

    61     printf ("\n\n");

    62     execve ("/usr/bin/free", args, NULL);

    63     return EXIT_SUCCESS;

    64 }