Add missing functions to the NAME section

Add serial commas. Fix minus. Sort SEE ALSO. Fix xref.

Implement pidfile_lock, pidfile_read and pidfile_clean.

Discussed on tech-net@, ok core@.

Extend pidfile(3) to support creating pid files in arbitrary locations.

If the argument provided to pidfile(3) contains a '/', then the value is
considered to be an absolute/relative path and the pi

Extend pidfile(3) to support creating pid files in arbitrary locations.

If the argument provided to pidfile(3) contains a '/', then the value is
considered to be an absolute/relative path and the pid file is created
in the given location.

Otherwise, pidfile(3) behaves as before and treats the provided value as
a basename to construct a pid file in /var/run/<basename>.pid. This means
that to create a pid file named "foo.pid" in the current directory, one
must specify "./foo.pid".

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Mark up NULL with Dv.

Use .Fn instead of .Nm.

Convert TNF licenses to new 2 clause variant

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.

Grammar fix, and drop a .Pp after a section header.

if called multiple times with different names, only the last pid file
will be kept

change return type of pidfile(3) to int (-1 on error), to inform caller
of errors. behavior now in sync with openbsd implementation.
(see tech-userlevel and bsd-api-discuss)

Generate <>& symbolically.

- Don't delete the pidfile if the process executing the cleanup handler
isn't the process who created it.
- If a new basename is supplied remove the an old pidfile if it was created
by this proce

- Don't delete the pidfile if the process executing the cleanup handler
isn't the process who created it.
- If a new basename is supplied remove the an old pidfile if it was created
by this process and create a new one as suggested by Jason Thorpe.
This fixes PR lib/13357 by Greg A. Woods.

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Fix typo.

Add pidfile(3), which write a pid file in /var/run, and arranges for it
to be removed on normal exit.