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syslog.3: document ident[N] format

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When libc switched to generation of logs as per RFC 5424,
that change broke application ability to insert specific process id
using ident[N] format, the feature existed for decades.
Some processes rely on it (including logger and syslogd).

Later the regression was fixed but the feature remained undocumented.
This change documents it.

MFC after:	1 week
This commit is contained in:
Eugene Grosbein 2023-07-03 19:35:37 +07:00
parent 2176c9ab71
commit 5aee3e14d4
2 changed files with 13 additions and 2 deletions
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7
lib/libc/gen/syslog.3
View file

@ -28,7 +28,7 @@
.\" @(#)syslog.3 8.1 (Berkeley) 6/4/93
.\" $FreeBSD$
.\"
.Dd May 13, 2021
.Dd July 3, 2023
.Dt SYSLOG 3
.Os
.Sh NAME
@ -131,6 +131,11 @@ The
.Fa ident
argument
is a string that will be prepended to every message.
It may be formatted as
.Fa ident[N]
in which case decimal number
.Fa N
replaces the process id within messages.
The
.Fa logopt
argument

8
usr.bin/logger/logger.1
View file

@ -28,7 +28,7 @@
.\" @(#)logger.1 8.1 (Berkeley) 6/6/93
.\" $FreeBSD$
.\"
.Dd March 16, 2022
.Dd July 3, 2023
.Dt LOGGER 1
.Os
.Sh NAME
@ -74,6 +74,8 @@ tries to send the message to all addresses.
Log the process id of the logger process
with each line.
This flag is ignored and the process id is always logged.
See also
.Fl t .
.It Fl s
Log the message to standard error, as well as the system log.
.It Fl f Ar file
@ -153,6 +155,10 @@ and
Mark every line in the log with the specified
.Ar tag
rather than the default of current login name.
Use
.Fl t Ar tag[N]
to insert specific decimal process id instead of id of
.Nm .
.It Ar message
Write the message to log; if not specified, and the
.Fl f