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/* libc/sys/linux/brk.c - Change data segment size */

/* Written 2000 by Werner Almesberger */

#include <stddef.h> /* for NULL */

#include <sys/types.h>

#include <sys/unistd.h>

#include <machine/syscall.h>

static char *curr_brk = NULL;

#define __NR___brk __NR_brk /* Linux brk ain't no brk(2) */

static _syscall1(void *,__brk,void *,end_data_segment)

int brk(void *end_data_segment)

{

     char *new_brk;

     new_brk = __brk(end_data_segment);

     if (new_brk != end_data_segment) return -1;

     curr_brk = new_brk;

     return 0;

}

void *sbrk(ptrdiff_t increment) /* SHOULD be ptrdiff_t */

{

    char *old_brk,*new_brk;

    if (!curr_brk) curr_brk = __brk(NULL);

    new_brk = __brk(curr_brk+increment);

    if (new_brk != curr_brk+increment) return (void *) -1;

    old_brk = curr_brk;

    curr_brk = new_brk;

    return old_brk;

}