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| author | Michael Kerrisk <mtk.manpages@gmail.com> | 2012-11-29 14:48:19 +0100 |
|---|---|---|
| committer | Michael Kerrisk <mtk.manpages@gmail.com> | 2012-11-29 15:51:22 +0100 |
| commit | 7fc3d0580bafd4d804eee722769ec7786987910c (patch) | |
| tree | c76cfeb7c4e8f9cad51ab6a3a558cad63a7ea114 | |
| parent | 70a259dcd570cebce2ec05d826f14b36368577eb (diff) | |
| download | man-pages-7fc3d0580bafd4d804eee722769ec7786987910c.tar.gz | |
syslog.2: Clarify semantics of SYSLOG_ACTION_CLEAR
The SYSLOG_ACTION_CLEAR command (5) does not really clear
the ring buffer; rather it affects the semantics of what
is returned by commands 3 (SYSLOG_ACTION_READ_ALL) and
4 (SYSLOG_ACTION_READ_CLEAR).
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
| -rw-r--r-- | man2/syslog.2 | 13 |
1 files changed, 12 insertions, 1 deletions
diff --git a/man2/syslog.2 b/man2/syslog.2 index 24fc8fc86d..4dd9c09c9b 100644 --- a/man2/syslog.2 +++ b/man2/syslog.2 @@ -102,7 +102,7 @@ placing then in the buffer pointed to by The call reads the last \fIlen\fP bytes from the log buffer (nondestructively), but will not read more than was written into the buffer since the -last "clear ring buffer" command (which does not clear the buffer at all). +last "clear ring buffer" command (see command 5 below)). The call returns the number of bytes read. .TP .BR SYSLOG_ACTION_READ_CLEAR " (4)" @@ -118,6 +118,17 @@ The and .I len arguments are ignored. +.IP +This command does not really clear the ring buffer. +Rather, it sets a kernel bookkeeping variable that +determines the results returned by commands 3 +.RB ( SYSLOG_ACTION_READ_ALL ) +and 4 +.RB ( SYSLOG_ACTION_READ_CLEAR ). +This command has no effect on commands 2 +.RB ( SYSLOG_ACTION_READ ) +and 9 +.RB ( SYSLOG_ACTION_SIZE_UNREAD ). .TP .BR SYSLOG_ACTION_CONSOLE_OFF " (6)" Disable printk to console. |