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 *
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 *
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 * @param address Virtual address pointing into already existing address space area.
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 * @param address Virtual address pointing into already existing address space area.
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 * @param size New requested size of the area.
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 * @param size New requested size of the area.
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 * @param flags Currently unused.
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 * @param flags Currently unused.
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 *
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 *
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 * @return address on success, (void *) -1 otherwise.
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 * @return Zero on success or a code from @ref errno.h on failure.
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 */
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 */
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void *as_area_resize(void *address, size_t size, int flags)
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int as_area_resize(void *address, size_t size, int flags)
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{
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{
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    return (void *) __SYSCALL3(SYS_AS_AREA_RESIZE, (sysarg_t ) address, (sysarg_t) size, (sysarg_t) flags);
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    return __SYSCALL3(SYS_AS_AREA_RESIZE, (sysarg_t ) address, (sysarg_t) size, (sysarg_t) flags);
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}
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/** Destroy address space area.
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 *
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 * @param address Virtual address pointing into the address space area being destroyed.
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 *
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 * @return Zero on success or a code from @ref errno.h on failure.
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 */
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int as_area_destroy(void *address)
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{
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    return __SYSCALL1(SYS_AS_AREA_DESTROY, (sysarg_t ) address);
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}
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}
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/** Prepare to accept address space area.
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/** Prepare to accept address space area.
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 *
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 *
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 * @param id Task ID of the donor task.
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 * @param id Task ID of the donor task.
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               if it should be shrinked
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               if it should be shrinked
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 * @return Pointer to newly allocated area
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 * @return Pointer to newly allocated area
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 */
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 */
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void *sbrk(ssize_t incr)
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void *sbrk(ssize_t incr)
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{
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{
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    int rc;
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    void *res;
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    void *res;
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    /* Check for invalid values */
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    /* Check for invalid values */
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    if (incr < 0 && -incr > heapsize)
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    if (incr < 0 && -incr > heapsize)
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        return NULL;
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        return NULL;
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    /* Check for too large value */
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    /* Check for too large value */
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        return NULL;
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        return NULL;
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    /* Check for too small values */
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    /* Check for too small values */
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    if (incr < 0 && incr+heapsize > heapsize)
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    if (incr < 0 && incr+heapsize > heapsize)
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        return NULL;
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        return NULL;
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    res = as_area_resize(&_heap, heapsize + incr,0);
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    rc = as_area_resize(&_heap, heapsize + incr,0);
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    if (!res)
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    if (rc != 0)
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        return NULL;
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        return NULL;
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    /* Compute start of new area */
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    /* Compute start of new area */
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    res = (void *)&_heap + heapsize;
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    res = (void *)&_heap + heapsize;
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