ualarm.3: cleanups, rewrites

Clean up the ualarm.3 page as we did with the alarm.3 page.

- Be more specific in the Name summary.
- Rewrite the Description. In particular, ualarm(3) does not block,

ualarm.3: cleanups, rewrites

Clean up the ualarm.3 page as we did with the alarm.3 page.

- Be more specific in the Name summary.
- Rewrite the Description. In particular, ualarm(3) does not block,
it schedules the signal for asynchronous delivery.
- The Return Values section is incoherent, rewrite it. Remove the
incorrect details about the upper bound.
- Add Caveats: discourage use of ualarm(3) and setitimer(2) in the
same program.

Input on v1 from schwarze@, deraadt@, millert@, and jmc@. Input on v2
from jmc@ and millert@.

v1: https://marc.info/?l=openbsd-tech&m=162508423008134&w=2
v2: https://marc.info/?l=openbsd-tech&m=169076642509763&w=2

ok jmc@ millert@

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Replace cross-references to sigvec(3) with sigaction(2).
OK guenther@

Use the fancy .In macro for includes. From Jan Klemkow. ok jmc schwarze

convert to new .Dd format;

Remove the advertising clause in the UCB license which Berkeley
rescinded 22 July 1999. Proofed by myself and Theo.

Various repairs, mostly to get rid of short lines.

Suffix "i.e." and "e.g." with a comma. Just another really picky man page
commit, as we want our documentation to be as consistently formatted as
possible (it's getting there :-)).

- remove all trailing whitespace
* except when it is escaped with a `\' at the end of the line
- fix remaining .Nm usage as well
- this is from a patch I received from kwesterback@home.com, who

- remove all trailing whitespace
* except when it is escaped with a `\' at the end of the line
- fix remaining .Nm usage as well
- this is from a patch I received from kwesterback@home.com, who has been
working on some scripts for fixing formatting errors in mdoc'd man pages

Ok, so there could be a cost/benefit debate with this commit, but since I have
the patch we might as well commit it...

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repairs; go back over some old files, because we should properly distinguish
between NUL and NULL, i.e., don't use the .Dv (defined variable) macro when
referring to an ASCII NUL

remove argument from .Os macros so value in /usr/share/tmac/mdoc/doc-common
is used instead; kwesterback@home.com

Cleanup xrefs under SEE ALSO. Specifically:

- Sort xrefs by section, and then alphabetically.
- Add missing commas between xref items.
- Remove commas from the last xref entry.
- Remove dup

Cleanup xrefs under SEE ALSO. Specifically:

- Sort xrefs by section, and then alphabetically.
- Add missing commas between xref items.
- Remove commas from the last xref entry.
- Remove duplicate entries.

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correct some Xr's which referred to the wrong man page sections

use Xr more often

Always give .Fn an argument, it will not default to the previous value.

XPG4.2 compat:
1) usleep() and ualarm() use useconds_t not u_int
2) usleep() returns an int

Parameter fix + a typo. maximum entropy <entropy@tardis.bernstein.com>

Fix RCS ids
Make sure everything uses {SYS,}LIBC_SCCS properly

initial import of NetBSD tree