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Clarify the return value from child_present.

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This commit is contained in:
Warner Losh 2002-09-11 04:22:10 +00:00
parent 4f39d5d511
commit 74014b7f0a
1 changed files with 7 additions and 0 deletions
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7
sys/kern/bus_if.m
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@ -247,6 +247,13 @@ METHOD struct resource_list * get_resource_list {
#
# Is the hardware described by _child still attached to the system?
#
# This method should return 0 if the device is not present. It should
# return -1 if it is present. Any errors in determining should be
# returned as a normal errno value. Client drivers are to assume that
# the device is present, even if there is an error determining if it is
# there. Busses are to try to avoid returning errors, but newcard will return
# an error if the device fails to implement this method.
#
METHOD int child_present {
device_t _dev;
device_t _child;