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bus_child_present — ?Х??ɥ饤?ФؤΥǥХ??????ºݤ?¸?ߤ??Ƥ??뤫?ɤ????γ?ǧ???䤤???碌

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<sys/param.h> <sys/bus.h>

<machine/bus.h> <sys/rman.h> <machine/resource.h> int bus_child_present(device_t dev)

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bus_child_present() ?ؿ??ϡ? dev ?οƥǥХ????ɥ饤?Ф??Ф??? dev ?ǵ??Ҥ??????ϡ??ɥ??????????????Ǥ??ޤ???ʪ??Ū?˥?????????ǽ?Ǥ??뤫 ?ɤ??????????å????뤳?Ȥ??׵ᤷ?ޤ??? ???Ѳ?ǽ?γ?ǰ?ϥХ????˰ۤʤ??ޤ????? ????Ū?ˤ????ѤǤ??ʤ??ϡ??ɥ??????Ȥϡ????ѤǤ????Ȥ??ˤ? bus_space*() ?᥽?åɤ??𤷤ƥ????????Ǥ??????Τ??? bus_space*() ?᥽?åɤ??𤷤ƥ????????Ǥ??ʤ????Τ??ؤ??ޤ???

?????? “???ΥǥХ????ϻҥǥХ????????äƤ??ޤ????” ?Ȥ??????????Ҥͤޤ????? ???μ????? device_get_children(9) ?ˤ??äƤ????ɤ??????????뤳?Ȥ???ǽ?Ǥ???

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0 ???????ͤϥ????ƥ????ˤ??ΥǥХ?????¸?ߤ??ʤ????Ȥ򼨤??ޤ??? 0 ?ǤϤʤ??????ͤϥ????ƥ????ˤ??ΥǥХ?????¸?ߤ??뤳?ȡ??ޤ??? ???ΥǥХ????ξ??֤??????Ǥ??ʤ????Ȥ򼨤??ޤ???

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?????Ϥ??륵???ץ륳???ɤǤ??? dc(4) ?ǥХ??????ºݤ?¸?ߤ??????ˡ?stop ???ƤӽФ??????Ǥ???

device_t dev;
dc_softc *sc;

sc = device_get_softc(dev);
if (bus_child_present(dev))
	dc_stop(sc);

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device(9), driver(9)

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???Υޥ˥奢???ڡ????? Warner Losh ⟨imp@FreeBSD.org⟩ ???񤭤ޤ?????