kernel/brktest.c at main · tiger9800/kernel · GitHub

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#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>

#include <comp421/yalnix.h>
#include <comp421/hardware.h>

int
main()
{
    void *currbreak;
    char *new;

    (void)new;
    currbreak = sbrk(0);

    fprintf(stderr, "sbrk(0) = %p\n", currbreak);

    currbreak = (void *)UP_TO_PAGE(currbreak);
    currbreak++;
    currbreak = (void *)UP_TO_PAGE(currbreak);

    if (Brk(currbreak)) {
	fprintf(stderr, "Brk %p returned error\n", currbreak);
	Exit(1);
    }

    currbreak++;
    currbreak = (void *)UP_TO_PAGE(currbreak);

    if (Brk(currbreak)) {
	fprintf(stderr, "Brk %p returned error\n", currbreak);
	Exit(1);
    }

    new = malloc(10000);

    Exit(0);
}