brk ~ Online tutorial

Brk

Changes data-segment space allocation

Declaration:

int brk(void *addr);

Remarks:

brk dynamically changes the amount of space allocated to the calling

program's heap by resetting the program's break value to addr.

brk and sbrk will fail without making any change in the allocated space if

such a change would allocate more space than is allowable.

Return Value:

On success,

brk returns 0

On error, both functions return -1 and

set errno to ENOMEM (not enough memory).

Program

#include <stdio.h>

#include <alloc.h>

int main(void)

{

char *ptr;

printf("Changing allocation with brk()\n");

ptr = (char *) malloc(1);

printf("Before brk() call: %lu bytes free\n", coreleft());

brk(ptr+1000);

printf(" After brk() call: %lu bytes free\n", coreleft());

return 0;

}

Please Give Us Your 1 Minute In Sharing This Post!

SOCIALIZE IT →

Online tutorial