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| author | Karel Zak | 2012-07-20 14:41:25 +0200 |
|---|---|---|
| committer | Karel Zak | 2012-07-20 14:41:25 +0200 |
| commit | 37b04d6cce552116f31272a56d699f7c6cc91cdf (patch) | |
| tree | fe0c460c9eb7a0e709fc770f6a584d0d2db47b2f /sys-utils/dmesg.1 | |
| parent | dmesg: cleanup exclusive_option() usage (diff) | |
| download | kernel-qcow2-util-linux-37b04d6cce552116f31272a56d699f7c6cc91cdf.tar.gz kernel-qcow2-util-linux-37b04d6cce552116f31272a56d699f7c6cc91cdf.tar.xz kernel-qcow2-util-linux-37b04d6cce552116f31272a56d699f7c6cc91cdf.zip | |
dmesg: implement backwardly compatible --raw for /dev/kmsg
.. and if you really want raw data from /dev/kmsg then use dd(1) ;-)
Signed-off-by: Karel Zak <kzak@redhat.com>
Diffstat (limited to 'sys-utils/dmesg.1')
| -rw-r--r-- | sys-utils/dmesg.1 | 15 |
1 files changed, 13 insertions, 2 deletions
diff --git a/sys-utils/dmesg.1 b/sys-utils/dmesg.1 index ff149a9e3..c67cfa14a 100644 --- a/sys-utils/dmesg.1 +++ b/sys-utils/dmesg.1 @@ -98,12 +98,23 @@ will print or clear the kernel ring buffer. .IP "\fB\-r\fR, \fB\-\-raw\fR" Print the raw message buffer, i.e., do not strip the log level prefixes. + +Note that the real raw format depends on method how +.BR dmesg (1) +reads kernel messages. The /dev/kmsg uses different format than +.BR syslog (2) . +For backward compatibility +.BR dmesg (1) +returns data always in +.BR syslog (2) +format. The real raw data from /dev/kmsg is possible to read for example by +command 'dd if=/dev/kmsg iflag=nonblock'. .IP "\fB\-S\fR, \fB\-\-syslog\fR" Force to use -.BR syslog(2) +.BR syslog (2) kernel interface to read kernel messages. The default is to use /dev/kmsg rather than -.BR syslog(2) +.BR syslog (2) since kernel 3.5.0. .IP "\fB\-s\fR, \fB\-\-buffer-size \fIsize\fR Use a buffer of |