mem2swap.c
author Markus Bröker <mbroeker@largo.dyndns.tv>
Sat, 13 Dec 2008 17:58:08 +0100
changeset 16 2b4ef74a16aa
parent 9 c3fecc82ade6
child 27 81a574d60c15
permissions -rw-r--r--
I extended the usage screen with help messages committer: Markus Bröker <mbroeker@largo.homelinux.org>
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/**
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 * test/demos/mem2swap.c
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 * Copyright (C) 2008 Markus Broeker
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 *
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 * mem2swpapc usage: mem2spap [<MB>]
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 */
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <errno.h>
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#define N 1000
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#ifndef DEFAULT_MEGS
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#define DEFAULT_MEGS 64
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#endif
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int set_limit (int);
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int main (int argc, char **argv)
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{
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    int i, n = 0;
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    long int *p;
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    long int *p_new;
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    char *args[] = { "/usr/bin/free", "-m", NULL };
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    int size = sizeof (*p);
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    int megs = DEFAULT_MEGS * 1024 * 1024;
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    if (argc == 2)
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        megs = atoi (argv[1]) * 1024 * 1024;
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    printf ("Mem2Swap - Version 1.0\n");
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    if (!set_limit (megs))
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        printf ("%d MB demanded ", megs / 1024 / 1024);
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    else {
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        printf ("\tUsage: %s [MEM]\n\n", argv[0]);
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        printf ("Report bugs to mbroeker@largo.homelinux.org\n");
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        return EXIT_FAILURE;
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    }
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    if ((p = malloc (N * size)) == NULL)
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        return EXIT_SUCCESS;
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    while (1) {
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        for (i = 0; i < N; i++) {
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            p[n * N + i] = size * (n * N + i);
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        }
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        if ((p_new = realloc (p, (++n + 1) * N * size)))
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            p = p_new;
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        else
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            break;
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    }
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    if (p) {
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        printf ("and %ld MB allocated\n", p[n * N - 1] / 1024 / 1024);
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        free (p);
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    }
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    printf ("\n\n");
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    execve ("/usr/bin/free", args, NULL);
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    return EXIT_SUCCESS;
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}