---
name: "vrb_resize"
section: "3"
platform: "linux"
package: "libvrb0-dev"
version: "0.5.1-5.1"
release: "Debian 7 (Wheezy)"
platforms: ["linux"]
url: "https://new.carta.tech/vrb_resize"
---

# vrb\_resize(3)

create a new virtual ring buffer

## NAME

vrb\_resize - create a new virtual ring buffer

## LIBRARY

**-lvrb**

## SYNOPSIS

**#include \<vrb.h\>**

*vrb\_p* **vrb\_resize***(size\_t* **size***, const char \****name***);*

## DESCRIPTION

**vrb\_resize** changes the size of a virtual ring buffer if the data in the source buffer will fit in the requested space.

## ARGUMENTS

*vrb\_p* **vrb**\
 specifies the ring buffer which will be resized.

*size\_t* **size**\
 specifies the requested minimum buffer size to be allocated. The given value will be rounded up to the nearest or equal whole multiple of the system page size. The virtual ring buffer is implemented by mapping two adjacent blocks of memory to the same memory object. Thus, twice as much virtual address space will be used and the specified size must be less than half of the available virtual address space for this process.

*const char \****name**\
 specifies an optional name of a file to be used as backing store via **[mmap(2)](/mmap/2.md)** in a mounted filesystem in which the process has write permission. If the named file cannot be opened for write, an error will occur. If **NULL** is given, swap space will be used as backing store via **[shmat(2)](/shmat/2.md).**

## RETURN VALUE

*int*\
 On success, 0 is returned. Otherwise, -1 is returned.

## ERRORS

If an error is returned, then *errno* will have one of the following values:

- **ENOSPC**

  The data in the current virtual ring buffer will not fit into the requested space.

- **EINVAL**

  A buffer size was requested which is too large for address space allocation arithmetic.

- **ENOMEM**

  Out of memory allocating the virtual ring buffer structure.

- \-

  An *errno* value set by a failing system call.

## SEE ALSO

[**vrb**(3)](/vrb/3.md), [**vrb\_capacity**(3)](/vrb_capacity/3.md), [**vrb\_data\_len**(3)](/vrb_data_len/3.md), [**vrb\_data\_ptr**(3)](/vrb_data_ptr/3.md), [**vrb\_destroy**(3)](/vrb_destroy/3.md), [**vrb\_get**(3)](/vrb_get/3.md), [**vrb\_get\_min**(3)](/vrb_get_min/3.md), [**vrb\_give**(3)](/vrb_give/3.md), [**vrb\_init**(3)](/vrb_init/3.md), [**vrb\_init\_opt**(3)](/vrb_init_opt/3.md), [**vrb\_is\_empty**(3)](/vrb_is_empty/3.md), [**vrb\_is\_full**(3)](/vrb_is_full/3.md), [**vrb\_is\_not\_empty**(3)](/vrb_is_not_empty/3.md), [**vrb\_is\_not\_full**(3)](/vrb_is_not_full/3.md), [**vrb\_move**(3)](/vrb_move/3.md), [**vrb\_new**(3)](/vrb_new/3.md), [**vrb\_new\_opt**(3)](/vrb_new_opt/3.md), [**vrb\_put**(3)](/vrb_put/3.md), [**vrb\_put\_all**(3)](/vrb_put_all/3.md), [**vrb\_read**(3)](/vrb_read/3.md), [**vrb\_read\_min**(3)](/vrb_read_min/3.md), [**vrb\_space\_len**(3)](/vrb_space_len/3.md), [**vrb\_space\_ptr**(3)](/vrb_space_ptr/3.md), [**vrb\_take**(3)](/vrb_take/3.md), [**vrb\_uninit**(3)](/vrb_uninit/3.md), [**vrb\_write**(3)](/vrb_write/3.md), [**vrb\_write\_min**(3)](/vrb_write_min/3.md)