Here are the data structures with brief descriptions:

Cscpi_command
Csr_analog_encoding
Csr_analog_meaning
Csr_analog_spec
Csr_channel	Information on single channel
Csr_channel_group	Structure for groups of channels that have common properties
Csr_config	Used for setting or getting value of a config item
Csr_context	Opaque structure representing a libsigrok context
Csr_datafeed_analog	Analog datafeed payload for type SR_DF_ANALOG
Csr_datafeed_analog_old	Analog datafeed payload for type SR_DF_ANALOG_OLD
Csr_datafeed_header	Header of a sigrok data feed
Csr_datafeed_logic	Logic datafeed payload for type SR_DF_LOGIC
Csr_datafeed_meta	Datafeed payload for type SR_DF_META
Csr_datafeed_packet	Packet in a sigrok data feed
Csr_dev_driver	Device driver data
Csr_key_info	Information about a key
Csr_option	Generic option struct used by various subsystems
Csr_rational
Csr_resource	Resource descriptor
Csr_scpi_dev_inst
Csr_scpi_hw_info
Csr_serial_port	Serial port descriptor
Csr_session	Opaque structure representing a libsigrok session
Csr_trigger	The representation of a trigger, consisting of one or more stages containing one or more matches on a channel
Csr_trigger_match	A channel to match and what to match it on
Csr_trigger_stage	A trigger stage