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.