---
layout: manual
Content-Style: 'text/css'
title: _MP(PMEMLOG_NBYTE, 3)
collection: libpmemlog
header: PMDK
date: pmemlog API version 1.1
...

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[comment]: <> (pmemlog_nbyte.3 -- man page for pmemlog_nbyte function)

[NAME](#name)<br />
[SYNOPSIS](#synopsis)<br />
[DESCRIPTION](#description)<br />
[RETURN VALUE](#return-value)<br />
[SEE ALSO](#see-also)<br />


# NAME #

**pmemlog_nbyte**() -- checks the amount of usable space in the log pool.


# SYNOPSIS #

```c
#include <libpmemlog.h>

size_t pmemlog_nbyte(PMEMlogpool *plp);
```

# DESCRIPTION #

The **pmemlog_nbyte**() function checks the amount of usable space in the log *plp*.
This function may be used on a log to determine how much usable space is
available after **libpmemlog**(7) has added its metadata to the memory pool.


# RETURN VALUE #

The **pmemlog_nbyte**() function returns the amount of usable space in the log *plp*.


# SEE ALSO #

**libpmemlog**(7) and **<http://pmem.io>**
