* Open one instance of this writer.
*
* This function should perform any work necessary to write the incoming
* Open one instance of this writer.
*
* This function should perform any work necessary to write the incoming
* a pointer to that structure via the given writer_node parameter.
*/
int (*open)(struct writer_node *);
* a pointer to that structure via the given writer_node parameter.
*/
int (*open)(struct writer_node *);