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Ciro Santilli
2017-06-08 06:26:20 +01:00
parent 41dbf46531
commit 4c1b0e7891
7 changed files with 85 additions and 85 deletions
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52
kernel_module/dep.c
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@@ -1,38 +1,38 @@
/*
Exports the lkmc_dep which dep2.ko uses.
insmod /dep.ko
# dmesg => 0
# dmesg => 0
# dmesg => ...
insmod /dep2.ko
# dmesg => 1
# dmesg => 2
# dmesg => ...
rmmod dep
# Fails because dep2 uses it.
rmmod dep2
# Dmesg stops incrementing.
rmmod dep
insmod /dep.ko
# dmesg => 0
# dmesg => 0
# dmesg => ...
insmod /dep2.ko
# dmesg => 1
# dmesg => 2
# dmesg => ...
rmmod dep
# Fails because dep2 uses it.
rmmod dep2
# Dmesg stops incrementing.
rmmod dep
sys visibility:
dmesg -n 1
insmod /dep.ko
insmod /dep2.ko
ls -l /sys/module/dep/holders
# => ../../dep2
cat refcnt
# => 1
dmesg -n 1
insmod /dep.ko
insmod /dep2.ko
ls -l /sys/module/dep/holders
# => ../../dep2
cat refcnt
# => 1
depmod:
grep dep "/lib/module/"*"/depmod"
# extra/dep2.ko: extra/dep.ko
# extra/dep.ko:
modprobe dep
# lsmod
# Both dep and dep2 were loaded.
grep dep "/lib/module/"*"/depmod"
# extra/dep2.ko: extra/dep.ko
# extra/dep.ko:
modprobe dep
# lsmod
# Both dep and dep2 were loaded.
TODO: at what point does buildroot / busybox generate that file?
*/