- libbson 1.13.1 »
- API Reference »
- bson_reader_t

# bson_reader_read_func_t

## Synopsis

    typedef ssize_t (*bson_reader_read_func_t) (void *handle,
                                                void *buf,
                                                size_t count);

## Parameters

- `handle`: The handle to read from.
- `buf`: The buffer to read into.
- `count`: The number of bytes to read.

## Description

A callback function that will be called by bson_reader_t to read the next chunk of data from the underlying opaque file descriptor.

This function is meant to operate similar to the `read(2)` function as part of libc on UNIX-like systems.

## Returns

0 for end of stream.

-1 for a failure on read.

A value greater than zero for the number of bytes read into `buf`.

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