sbrk ~ Online tutorial

<ALLOC.H>

Changes data-segment space allocation

Declaration:

void *sbrk(int incr);

Remarks:

sbrk changes the allocated space by adding incr bytes to the break value.

The amount of allocated space increases as the break value increases.

With sbrk, incr can be negative, which decreases the amount of allocated

space.

Return Value:

sbrk returns the old break value

On error, both functions return -1 and

set errno to ENOMEM (not enough memory).

Progarm

#include <stdio.h>

#include <alloc.h>

int main(void)

{

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

printf("Before sbrk() call: %lu bytes free\n",

(unsigned long) coreleft());

sbrk(1000);

printf(" After sbrk() call: %lu bytes free\n",

(unsigned long) coreleft());

return 0;

}

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