呼び出し順序 (NetBSD7以前)

• 世界は open(“/dev/audio”) によって創られる

get_locks, get_props, allocm, freem, round_buffersize

open

close, drain, query_encoding, get_props, set_params, getdev, dev_ioctl, round_blocksize, commit_settings, init_{input,output}, start_{input,output}, halt_{input,output}, trigger_{input,output}, speaker_ctl, setfd, mappage

success

open

close

At all time

Attach

Closed

Opened

※ query_devinfo, set_port, get_port は未調査