typedef ssize_t (*bson_reader_read_func_t) (void *handle,

       MongoDB, Inc

       2009-present, MongoDB, Inc.

1.30.4                                            Jun 08, 2025                        BSON_READER_READ_FUNC_T(3)

       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.

       • handle: The handle to read from.

       • buf: The buffer to read into.

       • count: The number of bytes to read.

       0 for end of stream.

       -1 for a failure on read.

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

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