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authorDavid Howells <dhowells@redhat.com>2020-01-14 20:07:11 +0300
committerDavid Howells <dhowells@redhat.com>2020-05-19 17:38:07 +0300
commitf5b5a164f9a11aab5b225f082b33a8f03c07516c (patch)
tree2e8495c9715765006985d2309312bcf2db0f462d /samples/Kconfig
parentf7e47677e39a03057dcced2016c92a9c868693ec (diff)
downloadlinux-f5b5a164f9a11aab5b225f082b33a8f03c07516c.tar.xz
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>
Diffstat (limited to 'samples/Kconfig')
-rw-r--r--samples/Kconfig6
1 files changed, 6 insertions, 0 deletions
diff --git a/samples/Kconfig b/samples/Kconfig
index 9d236c346de5..5c31971a5745 100644
--- a/samples/Kconfig
+++ b/samples/Kconfig
@@ -190,5 +190,11 @@ config SAMPLE_INTEL_MEI
help
Build a sample program to work with mei device.
+config SAMPLE_WATCH_QUEUE
+ bool "Build example /dev/watch_queue notification consumer"
+ depends on HEADERS_INSTALL
+ help
+ Build example userspace program to use the new mount_notify(),
+ sb_notify() syscalls and the KEYCTL_WATCH_KEY keyctl() function.
endif # SAMPLES