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syslog.2: Rework text describing loglevels 

The kernel header file mentioned in the discussion of the KERN_*
constants has morphed and is no longer exported inside glibc.
And the definitions of the constants themselves changed subtly
with kernel commit 04d2c8c83d0e3ac5f78aeede51babb3236200112.
So, rewrite the description of the constants to be a bit more
abstract.

Reported-by: Robert P. J. Day <rpjday@crashcourse.ca>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
This commit is contained in:
Michael Kerrisk 2014-05-26 14:59:58 +02:00
parent 7fdbbd1ed4
commit e32652ca9f
1 changed files with 15 additions and 13 deletions
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28
man2/syslog.2
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@ -1,3 +1,4 @@
'\" t
.\" Copyright (C) 1995 Andries Brouwer (aeb@cwi.nl)
.\"
.\" %%%LICENSE_START(VERBATIM)
@ -232,20 +233,21 @@ This level is
(6) unless the line starts with <d>
where \fId\fP is a digit in the range 1-7, in which case the level
is \fId\fP.
The conventional meaning of the loglevel is defined in
.I <linux/kernel.h>
as follows:
The conventional meaning of the loglevel is as follows:
.nf
#define KERN_EMERG "<0>" /* system is unusable */
#define KERN_ALERT "<1>" /* action must be taken immediately */
#define KERN_CRIT "<2>" /* critical conditions */
#define KERN_ERR "<3>" /* error conditions */
#define KERN_WARNING "<4>" /* warning conditions */
#define KERN_NOTICE "<5>" /* normal but significant condition */
#define KERN_INFO "<6>" /* informational */
#define KERN_DEBUG "<7>" /* debug-level messages */
.fi
.TS
lB lB lB
lB c l.
Kernel constant Level value Meaning
KERN_EMERG 0 System is unusable
KERN_ALERT 1 Action must be taken immediately
KERN_CRIT 2 Critical conditions
KERN_ERR 3 Error conditions
KERN_WARNING 4 Warning conditions
KERN_NOTICE 5 Normal but significant condition
KERN_INFO 6 Informational
KERN_DEBUG 7 Debug-level messages
.TE
.SH RETURN VALUE
For \fItype\fP equal to 2, 3, or 4, a successful call to
.BR syslog ()