syslog(3): Nix trailing whitespace in man page.

No functional change intended.

PR/58391: Noriyuki Soda: re-adding syslog_ss() to syslog.h and syslog.3

Remove workaround for ancient HTML generation code.

Remove trailing whitespace.

openlog(3): add LOG_PTRIM and LOG_NLOG log options.

syslog(3) is the one stop method of logging system events and diagnostics.
When debugging a daemon in the foreground on a terminal, each line is
p

openlog(3): add LOG_PTRIM and LOG_NLOG log options.

syslog(3) is the one stop method of logging system events and diagnostics.
When debugging a daemon in the foreground on a terminal, each line is
prefixed with tag[pid]: which is very repetative and can take up valuable
screen estate.
LOG_PTRIM solves this by removing this prefix from stderr output.

There is also the case where the debugging could involve a dry-run and
syslog(3) calls would pollute the system log with incorrect data.
LOG_NLOG solves this by not writing the the system log, but allowing
LOG_PERROR to operate as before.

Initially discussed here:
https://mail-index.netbsd.org/tech-userlevel/2016/10/06/msg010330.html

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Fix spelling of "parenthesis".

Adjust xref varargs(3) -> stdarg(3)

Move the structure inside the body text. Some additional markup improvements.

\\ -> \e

New sentence, new line. Mark up NULL with Dv.

Import syslogd SoC project by Martin Schuette:
- new syslog protocol api syslogp(3) that supports structured data
and draft-rfc timestamps
- reliable tcp connections with queueing
- encrypted c

Import syslogd SoC project by Martin Schuette:
- new syslog protocol api syslogp(3) that supports structured data
and draft-rfc timestamps
- reliable tcp connections with queueing
- encrypted connections

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Don't expose _ss functions for 4.0. Requested by core.

Remove trailing whitespace. Use .Bl -enum for an enumeration.

add async-signal-safe versions: syslog_ss and vsyslog_ss
multithread-safe syslog_r and vsyslog_r are not async-signal-safe.

Various fixes.

add _r functions for syslog from OpenBSD

Move UCB-licensed code from 4-clause to 3-clause licence.

Patches provided by Joel Baker in PR 22280, verified by myself.

New sentence, new line.

Clarify output. From PR#14290.

Grammar and mdoc fixes from jmc@openbsd.

Use
.In header.h
instead of
.Fd #include \*[Lt]header.h\*[Gt]
Much easier to read and write, and supported by groff for ages.
Okayed by ross.

New sentence, new line. From Robert Elz.

import CAVEATS sections from OpenBSD.
with little tweak by me.

Generate <>& symbolically.

Standardize section headers, sort sections, sort SEE ALSO, punctuation
and misc. fixes.