Here are the data structures with brief descriptions:

Cgpiod_chip	Refer to GPIO chips for functions that operate on gpiod_chip
Cgpiod_chip_info	Refer to Chip info for functions that operate on gpiod_chip_info
Cgpiod_edge_event	Refer to Line edge events handling for functions that operate on gpiod_edge_event
Cgpiod_edge_event_buffer	Refer to Line edge events handling for functions that operate on gpiod_edge_event_buffer
Cgpiod_info_event	Refer to Line status watch events for functions that operate on gpiod_info_event
Cgpiod_line_config	Refer to Line configuration objects for functions that operate on gpiod_line_config
Cgpiod_line_info	Refer to Line info for functions that operate on gpiod_line_info
Cgpiod_line_request	Refer to Line request operations for functions that operate on gpiod_line_request
Cgpiod_line_settings	Refer to Line settings objects for functions that operate on gpiod_line_settings
Cgpiod_request_config	Refer to Request configuration objects for functions that operate on gpiod_request_config