diff options
| author |   bluhm <bluhm@openbsd.org> | 2021-03-09 15:08:23 +0000 |
|---|---|---|
| committer | bluhm <bluhm@openbsd.org> | 2021-03-09 15:08:23 +0000 |
| commit | 5fc6fc53eed51b106058ed08dbfbec744f12aebd (patch) | |
| tree | 0496919e8c31deda94a074dedc9eee76d87b0ff8 /lib/libc | |
| parent | Replace time_t startup_time with struct timespec link_timeout. (diff) | |
| download | wireguard-openbsd-5fc6fc53eed51b106058ed08dbfbec744f12aebd.tar.xz wireguard-openbsd-5fc6fc53eed51b106058ed08dbfbec744f12aebd.zip | |
Early daemons like dhcpleased(8), slaacd(8), unwind(8), resolvd(8)
are started before syslogd(8). This resulted in ugly sendsyslog(2)
dropped logs and the real message was lost.
Create a temporary stash for log messages within the kernel. It
has a limited size of 100 messages, and each message is truncated
to 8192 bytes. When the stash is exhausted, the well-known dropped
message is generated with a counter. After syslogd(8) has setup
everything, it sends a debug line through libc to flush the kernel
stash. Then syslogd receives all messages from the kernel before
the usual logs.
OK deraadt@ visa@
Diffstat (limited to 'lib/libc')
| -rw-r--r-- | lib/libc/sys/sendsyslog.2 | 10 |
1 files changed, 6 insertions, 4 deletions
diff --git a/lib/libc/sys/sendsyslog.2 b/lib/libc/sys/sendsyslog.2 index 278a4f99cd7..b1bd25a4f5c 100644 --- a/lib/libc/sys/sendsyslog.2 +++ b/lib/libc/sys/sendsyslog.2 @@ -1,4 +1,4 @@ -.\" $OpenBSD: sendsyslog.2,v 1.12 2020/11/05 16:04:39 jmc Exp $ +.\" $OpenBSD: sendsyslog.2,v 1.13 2021/03/09 15:08:23 bluhm Exp $ .\" .\" Copyright (c) 2017 Alexander Bluhm <bluhm@openbsd.org> .\" Copyright (c) 2014 Theo de Raadt @@ -15,7 +15,7 @@ .\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF .\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. .\" -.Dd $Mdocdate: November 5 2020 $ +.Dd $Mdocdate: March 9 2021 $ .Dt SENDSYSLOG 2 .Os .Sh NAME @@ -51,10 +51,12 @@ This is used internally by so that messages can be sent during difficult situations. If sending to .Xr syslogd 8 -fails, dropped messages are counted. +fails, up to 100 messages are stashed in the kernel. +After that, dropped messages are counted. When .Xr syslogd 8 -works again, a warning with the counter and error number is logged. +works again, before the next message, stashed messages and possibly +a warning with the drop counter, error number, and pid is logged. .Pp To receive messages from the kernel, .Xr syslogd 8 |