linux/samples/watch_queue/Makefile

# List of programs to build
hostprogs := watch_test

# Tell kbuild to always build the programs
always-y := $(hostprogs)

HOSTCFLAGS_watch_test.o += -I$(objtree)/usr/include
Add sample notification program The sample program is run like: ./samples/watch_queue/watch_test and watches "/" for mount changes and the current session keyring for key changes: # keyctl add user a a @s 1035096409 # keyctl unlink 1035096409 @s producing: # ./watch_test read() = 16 NOTIFY[000]: ty=000001 sy=02 i=00000110 KEY 2ffc2e5d change=2[linked] aux=1035096409 read() = 16 NOTIFY[000]: ty=000001 sy=02 i=00000110 KEY 2ffc2e5d change=3[unlinked] aux=1035096409 Other events may be produced, such as with a failing disk: read() = 22 NOTIFY[000]: ty=000003 sy=02 i=00000416 USB 3-7.7 dev-reset e=0 r=0 read() = 24 NOTIFY[000]: ty=000002 sy=06 i=00000418 BLOCK 00800050 e=6[critical medium] s=64000ef8 This corresponds to: blk_update_request: critical medium error, dev sdf, sector 1677725432 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 0 in dmesg. Signed-off-by: David Howells <dhowells@redhat.com> 2020-01-14 17:07:11 +00:00			`# List of programs to build`
			`hostprogs := watch_test`

			`# Tell kbuild to always build the programs`
			`always-y := $(hostprogs)`

			`HOSTCFLAGS_watch_test.o += -I$(objtree)/usr/include`