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 iniov.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.