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-rw-r--r--Documentation/ABI/testing/dev-kmsg5
1 files changed, 5 insertions, 0 deletions
diff --git a/Documentation/ABI/testing/dev-kmsg b/Documentation/ABI/testing/dev-kmsg
index f307506eb54c..1e6c28b1942b 100644
--- a/Documentation/ABI/testing/dev-kmsg
+++ b/Documentation/ABI/testing/dev-kmsg
@@ -56,6 +56,11 @@ Description: The /dev/kmsg character device node provides userspace access
seek after the last record available at the time
the last SYSLOG_ACTION_CLEAR was issued.
+ Due to the record nature of this interface with a "read all"
+ behavior and the specific positions each seek operation sets,
+ SEEK_CUR is not supported, returning -ESPIPE (invalid seek) to
+ errno whenever requested.
+
The output format consists of a prefix carrying the syslog
prefix including priority and facility, the 64 bit message
sequence number and the monotonic timestamp in microseconds,