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| author | David Howells <dhowells@redhat.com> | 2020-01-14 17:07:11 +0000 |
|---|---|---|
| committer | David Howells <dhowells@redhat.com> | 2020-05-19 15:38:07 +0100 |
| commit | f5b5a164f9a11aab5b225f082b33a8f03c07516c (patch) | |
| tree | 2e8495c9715765006985d2309312bcf2db0f462d /samples/Kconfig | |
| parent | f7e47677e39a03057dcced2016c92a9c868693ec (diff) | |
| download | lwn-f5b5a164f9a11aab5b225f082b33a8f03c07516c.tar.gz lwn-f5b5a164f9a11aab5b225f082b33a8f03c07516c.zip | |
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/Kconfig | 6 |
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 |