mongoc_gridfs_file_readv()

Synopsis

ssize_t
mongoc_gridfs_file_readv (mongoc_gridfs_file_t *file,
                          mongoc_iovec_t *iov,
                          size_t iovcnt,
                          size_t min_bytes,
                          uint32_t timeout_msec);

Parameters

• file: A mongoc_gridfs_file_t.

• iov: An array of mongoc_iovec_t.

• iovcnt: The number of elements in iov.

• min_bytes: The minimum number of bytes that must be read or an error will be synthesized.

• timeout_msec: Unused.

Description

This function performs a scattered read from file, potentially blocking to read from the MongoDB server.

The timeout_msec parameter is unused.

Returns

Returns the number of bytes read, or -1 on failure. Use mongoc_gridfs_file_error() to retrieve error details.