Here are the data structures with brief descriptions:

C_libopm_list
C_libopm_node
C_OPM
C_OPM_CALLBACK
C_OPM_CONFIG
C_opm_config_hash
C_OPM_CONNECTION
C_opm_inaddr
C_OPM_PROTOCOL
C_OPM_PROTOCOL_CONFIG
C_OPM_REMOTE
C_OPM_SCAN
C_opm_sockaddr