• David Howells's avatar
    Add sample notification program · f5b5a164
    David Howells authored
    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: default avatarDavid Howells <dhowells@redhat.com>
    f5b5a164
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