pause.3: miscellaneous rewrites, cleanup

Eliminate some redundant or extraneous pieces from the pause.3 page.
Say the "thread" "blocks", don't say the "process" "pauses". No need
to enumerate the ways a signal can be delivered. Add a few relevant
cross-references.

With input from millert@ and schwarze@.

Link: https://marc.info/?l=openbsd-tech&m=166801212316670&w=2

ok millert@ schwarze@

use Fn; from josiah frentsos

access(2) alarm(2) pause(2) were not ported from pwb to v7

Alan Glasser describes the incident that led to access(2) in
https://minnie.tuhs.org/pipermail/tuhs/2021-November/024657.html

access(2) alarm(2) pause(2) were also part of the "50 changes" tape

post v6 "50 bugs" / "diff tape" / "50 fixes" tape (Salus QCU, pp 138-139)
"fifty changes" tape
https://www.oreilly.com/openbook/opensources/book/kirkmck.html

"50 changes"
https://archive.org/details/unix_news_november-1976

tuhs/Applications/Spencer_Tapes/unsw3.tar.gz
usr/sys/v6unix/changenotes

45) The "access()" system call checks access permissions on the real
id's of the process regardless of the effective ones. Doesn't return
stats, just does an internal "access()" to set u.u_error.

48) "alarm()" and "pause()" system calls are in to provide a user-mode
timeout capability.

with and ok schwarze@

typo.

more library history
facts checked by sobrado@
style tweaks and ok jmc@

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

convert to new .Dd format;

- sync prototypes and header file excerpts to reality
- many grammar, punctuation, macro, layout, spelling/typos,
rewording, etc. fixes
- avoid first person
- sprinkle crossrefs where relevant

help & ok jmc

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rescinded 22 July 1999.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.

- 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...

use \-1, not -1, to change the meaning of `-' to minus sign from hyphen;
pjanzen@

repairs

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

sigsuspend, not sigpause

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

branches: 1.1.1;
Initial revision

use Fn; from josiah frentsos

access(2) alarm(2) pause(2) were not ported from pwb to v7

Alan Glasser describes the incident that led to access(2) in
https://minnie.tuhs.org/pipermail/tuhs/2021-November/024657.html

access(2) alarm(2) pause(2) were also part of the "50 changes" tape

post v6 "50 bugs" / "diff tape" / "50 fixes" tape (Salus QCU, pp 138-139)
"fifty changes" tape
https://www.oreilly.com/openbook/opensources/book/kirkmck.html

"50 changes"
https://archive.org/details/unix_news_november-1976

tuhs/Applications/Spencer_Tapes/unsw3.tar.gz
usr/sys/v6unix/changenotes

45) The "access()" system call checks access permissions on the real
id's of the process regardless of the effective ones. Doesn't return
stats, just does an internal "access()" to set u.u_error.

48) "alarm()" and "pause()" system calls are in to provide a user-mode
timeout capability.

with and ok schwarze@

typo.

more library history
facts checked by sobrado@
style tweaks and ok jmc@

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

convert to new .Dd format;

- sync prototypes and header file excerpts to reality
- many grammar, punctuation, macro, layout, spelling/typos,
rewording, etc. fixes
- avoid first person
- sprinkle crossrefs where relevant

help & ok jmc

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.

- 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...

use \-1, not -1, to change the meaning of `-' to minus sign from hyphen;
pjanzen@

repairs

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

sigsuspend, not sigpause

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

branches: 1.1.1;
Initial revision

access(2) alarm(2) pause(2) were not ported from pwb to v7

Alan Glasser describes the incident that led to access(2) in
https://minnie.tuhs.org/pipermail/tuhs/2021-November/024657.html

access(2) alarm(2) pause(2) were also part of the "50 changes" tape

post v6 "50 bugs" / "diff tape" / "50 fixes" tape (Salus QCU, pp 138-139)
"fifty changes" tape
https://www.oreilly.com/openbook/opensources/book/kirkmck.html

"50 changes"
https://archive.org/details/unix_news_november-1976

tuhs/Applications/Spencer_Tapes/unsw3.tar.gz
usr/sys/v6unix/changenotes

45) The "access()" system call checks access permissions on the real
id's of the process regardless of the effective ones. Doesn't return
stats, just does an internal "access()" to set u.u_error.

48) "alarm()" and "pause()" system calls are in to provide a user-mode
timeout capability.

with and ok schwarze@

typo.

more library history
facts checked by sobrado@
style tweaks and ok jmc@

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

convert to new .Dd format;

- sync prototypes and header file excerpts to reality
- many grammar, punctuation, macro, layout, spelling/typos,
rewording, etc. fixes
- avoid first person
- sprinkle crossrefs where relevant

help & ok jmc

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.

- 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...

use \-1, not -1, to change the meaning of `-' to minus sign from hyphen;
pjanzen@

repairs

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

sigsuspend, not sigpause

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

branches: 1.1.1;
Initial revision

typo.

more library history
facts checked by sobrado@
style tweaks and ok jmc@

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

convert to new .Dd format;

- sync prototypes and header file excerpts to reality
- many grammar, punctuation, macro, layout, spelling/typos,
rewording, etc. fixes
- avoid first person
- sprinkle crossrefs where relevant

help & ok jmc

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.

- 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...

use \-1, not -1, to change the meaning of `-' to minus sign from hyphen;
pjanzen@

repairs

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

sigsuspend, not sigpause

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

branches: 1.1.1;
Initial revision